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{{short description|Specific learning disability characterized by troubles with reading}} | |||
{{About|developmental dyslexia|acquired dyslexia|Alexia (acquired dyslexia)}} | |||
{{good article}} | |||
{{cs1 config|name-list-style=vanc}} | |||
{{Infobox disease | |||
{{pp-semi-indef|small=yes}} | |||
| Name = Dyslexia | |||
{{pp-move-indef}} | |||
| Image = | |||
{{Use dmy dates|date=January 2021}} | |||
| Caption = | |||
{{Infobox medical condition (new) | |||
| DiseasesDB = 4016 | |||
| name = Dyslexia | |||
| ICD10 = {{ICD10|R|48|0|r|47}} | |||
| synonyms = Reading disorder | |||
| ICD9 = {{ICD9|315.02}} | |||
| image = File:Dislexia nens.jpg | |||
| ICDO = | |||
| image_size = | |||
| OMIM = 127700 | |||
| caption = Difficulties in processing letters and words | |||
| MedlinePlus = | |||
| types = ] | |||
| eMedicineSubj = | |||
| field = ], ] | |||
| eMedicineTopic = D009983 | |||
| symptoms = Trouble ]<ref name="ninds1"/> | |||
| MeshID = D004410 | |||
| complications = | |||
| onset = School age<ref name=Lancet2012/> | |||
| duration = | |||
| causes = ] and environmental factors<ref name=Lancet2012 /> | |||
| risks = Family history, ]<ref name=NIH2014Def/> | |||
| diagnosis = Series memory, spelling, vision, and reading test<ref name=NIH2015Diag/> | |||
| differential = ] or ]s, insufficient ]<ref name=Lancet2012/> | |||
| prevention = | |||
| treatment = Adjusting teaching methods<ref name=ninds1/> | |||
| medication = | |||
| prognosis = | |||
| frequency = 3–7%<ref name=Lancet2012/><ref name=Koo2013/> | |||
| deaths = | |||
}} | }} | ||
<!-- Definition and symptoms --> | |||
'''Dyslexia''' is a ] that impairs a person's ability to read,<ref name="ninds1">{{Cite web|url=http://www.ninds.nih.gov/disorders/dyslexia/dyslexia.htm |title=Dyslexia Information Page |publisher=National Institute of Neurological Disorders and Stroke |date=2010-05-12 |accessdate=2010-07-05}}</ref> and which can manifest itself as a difficulty with ], ], ], ], and/or ].<ref>{{Cite journal|author=Grigorenko EL |title=Developmental dyslexia: an update on genes, brains, and environments |journal=J Child Psychol Psychiatry |volume=42 |issue=1 |pages=91–125 |year=2001 |month=January |pmid=11205626 |doi=10.1111/1469-7610.00704 |url=http://www.ingentaconnect.com/content/bpl/jcpp/2001/00000042/00000001/art00005 }}</ref><ref>{{Cite journal|author=Schulte-Körne G, Warnke A, Remschmidt H |title= |language=German |journal=Z Kinder Jugendpsychiatr Psychother |volume=34 |issue=6 |pages=435–44 |year=2006 |month=November |pmid=17094062 |doi=10.1024/1422-4917.34.6.435 }}</ref> | |||
'''Dyslexia''', previously known as '''word blindness''', is a ] that affects either reading or writing.<ref name=ninds1>{{cite web |url=https://www.ninds.nih.gov/Disorders/All-Disorders/Dyslexia-Information-Page |title=Dyslexia Information Page |date=2 November 2018 |publisher=] }}</ref><ref>{{cite journal | vauthors = Siegel LS | title = Perspectives on dyslexia | journal = Paediatrics & Child Health | volume = 11 | issue = 9 | pages = 581–7 | date = November 2006 | pmid = 19030329 | pmc = 2528651 | doi = 10.1093/pch/11.9.581 | issn=1205-7088 }}</ref> Different people are affected to different degrees.<ref name=NIH2014Def/> Problems may include difficulties in ] words, reading quickly, ], "sounding out" words ], pronouncing words when reading aloud and understanding what one reads.<ref name=NIH2014Def/><ref>{{cite web |url=https://www.nichd.nih.gov/health/topics/reading/conditioninfo/symptoms |title=What are the symptoms of reading disorders? |publisher=National Institutes of Health |date=1 December 2016 }}</ref> Often these difficulties are first noticed at school.<ref name=Lancet2012>{{cite journal|last1=Peterson|first1=Robin L.|last2=Pennington|first2=Bruce F.|title=Developmental dyslexia|journal=Lancet|volume=379|issue=9830|pages=1997–2007|date=May 2012|pmid=22513218|pmc=3465717 |doi=10.1016/S0140-6736(12)60198-6}}</ref> The difficulties are involuntary, and people with this disorder have a normal desire to ].<ref name=NIH2014Def>{{cite web |url=https://www.nichd.nih.gov/health/topics/reading/conditioninfo/disorders |title=What are reading disorders? |publisher=National Institutes of Health |date=1 December 2016 }}</ref> People with dyslexia have higher rates of ] (ADHD), ]s, and ].<ref name=Lancet2012/><ref>{{cite journal|last1=Sexton|first1=Chris C.|last2=Gelhorn|first2=Heather L.|last3=Bell|first3=Jill A.|last4=Classi|first4=Peter M.|date=November 2012|title=The Co-occurrence of Reading Disorder and ADHD: Epidemiology, Treatment, Psychosocial Impact, and Economic Burden|journal=Journal of Learning Disabilities|volume=45|issue=6|pages=538–564|doi=10.1177/0022219411407772|pmid=21757683|s2cid=385238}}</ref> | |||
Dyslexia is separate and distinct from reading difficulties resulting from other causes, such as a non-neurological deficiency with vision or hearing, or from poor or inadequate ].<ref>{{Cite journal|author=Stanovich KE |title=Explaining the differences between the dyslexic and the garden-variety poor reader: the phonological-core variable-difference model |journal=Journal of Learning Disabilities |volume=21 |issue=10 |pages=590–604 |year=1988 |month=December |pmid=2465364 |doi=10.1177/002221948802101003 }}</ref><ref>{{Cite journal| title = Reading and spelling disorders: Clinical features and causes | journal = Journal European Child & Adolescent Psychiatry | date = 1999-09-19 | first = Andreas | last = Warnke | volume = 8 | issue = 3 | pages = S2–S12| doi = 10.1007/PL00010689 | url = http://www.springerlink.com/content/m31740417111l8w3/?p=e21d91f12abf440186aa325a73b0c59dπ=1 | accessdate = 2010-07-11}}</ref> It is estimated that dyslexia can affects between 5 to 10 percent of any given population, there has been studies to suggest the possibility.<ref>{{Cite journal|author=McCandliss BD, Noble KG |title=The development of reading impairment: a cognitive neuroscience model |journal=Ment Retard Dev Disabil Res Rev |volume=9 |issue=3 |pages=196–204 |year=2003 |pmid=12953299 |doi=10.1002/mrdd.10080 |url=}}</ref><ref name=Czepita2006 >{{Cite journal|author=Czepita D, Lodygowska E |title= |language=Polish |journal=Klin Oczna |volume=108 |issue=1–3 |pages=110–3 |year=2006 |pmid=16883955 |doi= |url=}}</ref><ref name="Birsh2005">{{Cite book|last=Birsh |first=Judith R. |year=2005 |chapter=Research and reading disability |editor=Judith R. Birsh |title=Multisensory Teaching of Basic Language Skills |page=8 |publisher=Paul H. Brookes Publishing |location=Baltimore, Maryland |isbn=978-1-55766-678-5 |oclc=234335596}}</ref> | |||
<!-- Cause, mechanism, and diagnosis --> | |||
There are three proposed cognitive subtypes of dyslexia: auditory, visual and attentional.<ref name=Czepita2006/><ref name=cognitivedeficits>{{Cite journal|author=Valdois S, Bosse ML, Tainturier MJ |title=The cognitive deficits responsible for developmental dyslexia: review of evidence for a selective visual attentional disorder |journal=Dyslexia |volume=10 |issue=4 |pages=339–63 |year=2004 |month=November |pmid=15573964 |doi=10.1002/dys.284 |url=}}</ref><ref name='Heim'>{{Cite journal|author=Heim S, Tschierse J, Amunts K |title=Cognitive subtypes of dyslexia |journal=Acta Neurobiologiae Experimentalis |volume=68 |issue=1 |pages=73–82 |year=2008 |pmid=18389017 |url=http://www.ane.pl/linkout.php?pii=6809 |issn=0065-1400}}</ref><ref>{{Cite journal|author=Facoetti A, Lorusso ML, Paganoni P, ''et al.'' |title=Auditory and visual automatic attention deficits in developmental dyslexia |journal=Brain Res Cogn Brain Res |volume=16 |issue=2 |pages=185–91 |year=2003 |month=April |pmid=12668226 |doi= 10.1016/S0926-6410(02)00270-7|url=}}</ref><ref name=anchoring >{{Cite journal|author=Ahissar M |title=Dyslexia and the anchoring-deficit hypothesis |journal=Trends Cogn. Sci. (Regul. Ed.) |volume=11 |issue=11 |pages=458–65 |year=2007 |month=November |pmid= 17983834|doi=10.1016/j.tics.2007.08.015 |url=}}</ref><ref name="Chung KK">{{Cite journal|author=Chung KK, Ho CS, Chan DW, Tsang SM, Lee SH |title=Cognitive profiles of Chinese adolescents with dyslexia |journal=Dyslexia |volume=16 |issue=1 |pages=2–23 |year=2010 |month=February |pmid=19544588 |doi=10.1002/dys.392 |url=http://www3.interscience.wiley.com/journal/122462213/abstract }}</ref> Although dyslexia is not an intellectual disability, it is considered both a ]<ref name="MeSH">{{Cite web|title=Learning Disorders: MeSH Result|url=http://www.ncbi.nlm.nih.gov/mesh/68004410?ordinalpos=1&itool=EntrezSystem2.PEntrez.Mesh.Mesh_ResultsPanel.Mesh_RVFull|publisher=|accessdate=2009-11-06}}</ref><ref>{{Cite web|title=Dyslexia|url=http://www.ncld.org/ld-basics/ld-aamp-language/reading/dyslexia|publisher=|accessdate=2009-11-07}}</ref> and a ].<ref name="MeSH"/><ref>{{Cite web|title=Dyslexia|url=http://www.mayoclinic.com/health/dyslexia/DS00224|publisher=]|accessdate=2009-11-07}}</ref> Dyslexia and ] are not interrelated, since reading and cognition develop independently in individuals who have dyslexia.<ref>{{Cite journal|author=Ferrer E, Shaywitz BA, Holahan JM, Marchione K, Shaywitz SE |title=Uncoupling of reading and IQ over time: empirical evidence for a definition of dyslexia |journal=Psychol Sci |volume=21 |issue=1 |pages=93–101 |year=2010 |month=January |pmid=20424029 |doi=10.1177/0956797609354084 |url=}}</ref> | |||
Dyslexia is believed to be caused by the ] of ] and environmental factors.<ref name="Lancet2012" /> Some cases run in families.<ref name="NIH2014Def" /><!-- quote = Dyslexia can be inherited in some families --> Dyslexia that develops due to a ], ], or ] is sometimes called "acquired dyslexia"<ref name="ninds1" /> or '''alexia'''.<ref name=NIH2014Def/> The underlying mechanisms of dyslexia result from differences within ].<ref name="NIH2014Def" /> Dyslexia is diagnosed through a series of tests of memory, vision, spelling, and reading skills.<ref name="NIH2015Diag">{{cite web|url=http://www.nichd.nih.gov/health/topics/reading/conditioninfo/pages/diagnosed.aspx|title=How are reading disorders diagnosed?|publisher=National Institutes of Health|access-date=15 March 2015|url-status=live|archive-url=https://web.archive.org/web/20150402093505/http://www.nichd.nih.gov/health/topics/reading/conditioninfo/pages/diagnosed.aspx|archive-date=2 April 2015}}</ref> Dyslexia is separate from reading difficulties caused by ] or ]s or by insufficient ] or opportunity to learn.<ref name="Lancet2012" /> | |||
<!-- Treatment and epidemiology --> | |||
Treatment involves adjusting teaching methods to meet the person's needs.<ref name=ninds1/> While not curing the underlying problem, it may decrease the degree or impact of symptoms.<ref>{{cite web|url=http://www.nichd.nih.gov/health/topics/reading/conditioninfo/pages/treatment.aspx|title=What are common treatments for reading disorders?|publisher=National Institutes of Health|access-date=15 March 2015|url-status=live|archive-url=https://web.archive.org/web/20150402142536/http://www.nichd.nih.gov/health/topics/reading/conditioninfo/pages/treatment.aspx|archive-date=2 April 2015}}</ref> Treatments targeting vision are not effective.<ref name=Handler2011>{{cite journal|last1=Handler|first1=SM|last2=Fierson|first2=WM|last3=Section on|first3=Ophthalmology|last4=Council on Children with|first4=Disabilities|last5=American Academy of|first5=Ophthalmology|last6=American Association for Pediatric Ophthalmology and|first6=Strabismus|last7=American Association of Certified|first7=Orthoptists|title=Learning disabilities, dyslexia, and vision.|journal=Pediatrics|date=March 2011|volume=127|issue=3|pages=e818–56|pmid=21357342|doi=10.1542/peds.2010-3670|s2cid=11454203 |doi-access=}}</ref> Dyslexia is the most common ] and occurs in all areas of the world.<ref name=UmphredLazaro2013m>{{cite book|author1=Umphred, Darcy Ann|author2=Lazaro, Rolando T.|author3=Roller, Margaret|author4=Burton, Gordon|title=Neurological Rehabilitation|url=https://books.google.com/books?id=lVJPAQAAQBAJ&pg=PA383|year=2013|publisher=Elsevier Health Sciences|isbn=978-0-323-26649-9|page=383|url-status=live|archive-url=https://web.archive.org/web/20170109173020/https://books.google.com/books?id=lVJPAQAAQBAJ&pg=PA383|archive-date=9 January 2017}}</ref> It affects 3–7% of the population;<ref name=Lancet2012/><ref name=Koo2013>{{cite book|last1=Kooij|first1=J. J. Sandra|title=Adult ADHD diagnostic assessment and treatment|date=2013|publisher=Springer|location=London|isbn=9781447141389|page=83|edition=3rd|url=https://books.google.com/books?id=JM_awX-mSPoC&pg=PA83|url-status=live|archive-url=https://web.archive.org/web/20160430012545/https://books.google.com/books?id=JM_awX-mSPoC&pg=PA83|archive-date=30 April 2016}}</ref> however, up to 20% of the general population may have some degree of symptoms.<ref>{{cite web|url=http://www.nichd.nih.gov/health/topics/reading/conditioninfo/pages/risk.aspx|title=How many people are affected by/at risk for reading disorders?|publisher=National Institutes of Health|access-date=15 March 2015|url-status=live|archive-url=https://web.archive.org/web/20150402101751/http://www.nichd.nih.gov/health/topics/reading/conditioninfo/pages/risk.aspx|archive-date=2 April 2015}}</ref> While dyslexia is more often diagnosed in boys, this is partly explained by a self-fulfilling ] among teachers and professionals.<ref name=Lancet2012/><ref>{{cite journal | url=https://doi.org/10.1111/jcpp.12691 | doi=10.1111/jcpp.12691 | title=Explaining the sex difference in dyslexia | year=2017 | last1=Arnett | first1=Anne B. | last2=Pennington | first2=Bruce F. | last3=Peterson | first3=Robin L. | last4=Willcutt | first4=Erik G. | last5=Defries | first5=John C. | last6=Olson | first6=Richard K. | journal=Journal of Child Psychology and Psychiatry | volume=58 | issue=6 | pages=719–727 | pmid=28176347 | pmc=5438271 }}</ref> It has even been suggested that the condition affects men and women equally.<ref name=UmphredLazaro2013m/> Some believe that dyslexia is best considered as a different way of learning, with both benefits and downsides.<ref>{{cite magazine|url = https://www.wired.com/2011/09/dyslexic-advantage/|title = The Unappreciated Benefits of Dyslexia|date = September 2011|access-date = 10 August 2016|magazine = Wired|last = Venton|first = Danielle|url-status = live|archive-url = https://web.archive.org/web/20160805001607/http://www.wired.com/2011/09/dyslexic-advantage|archive-date = 5 August 2016|df = dmy-all}}</ref><ref>{{cite web|url = http://www.scientificamerican.com/article/the-advantages-of-dyslexia/|title = The Advantages of Dyslexia|date = August 2014|access-date = 10 August 2016|website = ScientificAmerican.com|publisher = Scientific American|last = Mathew|first = Schneps|url-status = live|archive-url = https://web.archive.org/web/20160804232616/http://www.scientificamerican.com/article/the-advantages-of-dyslexia/|archive-date = 4 August 2016|df = dmy-all}}</ref> | |||
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==Classification== | ==Classification== | ||
{{Main|Pure alexia}} | |||
Spoken language is a universal form of man made communication. The visual notation of speech, written language is not found in all cultures and is a recent development with regard to human evolution.<ref name="Genes cognition communication" >{{Cite journal|author=Bishop DV |title=Genes, cognition, and communication: insights from neurodevelopmental disorders |journal=Ann. N. Y. Acad. Sci. |volume=1156 |issue= |pages=1–18 |year=2009 |month=March |pmid=19338500 |pmc=2805335 |doi=10.1111/j.1749-6632.2009.04419.x |url=http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2805335/?tool=pubmed}}</ref> | |||
Dyslexia is divided into developmental and acquired forms.<ref>Oxford English Dictionary. 3rd ed. ". Oxford, UK: Oxford University Press, 2012 ("a learning disability specifically affecting the attainment of literacy, with difficulty esp. in word recognition, spelling, and the conversion of letters to sounds, occurring in a child with otherwise normal development, and now usually regarded as a neurodevelopmental disorder with a genetic component.")</ref> Acquired dyslexia occurs subsequent to neurological insult, such as ] or ]. People with acquired dyslexia exhibit some of the signs or symptoms of the developmental disorder, but require different assessment strategies and treatment approaches.<ref>{{cite journal|last=Woollams|first=Anna M.|date=19 January 2014|title=Connectionist neuropsychology: uncovering ultimate causes of acquired dyslexia|journal=Philosophical Transactions of the Royal Society B: Biological Sciences|language=en|volume=369|issue=1634|pages=20120398|doi=10.1098/rstb.2012.0398|issn=0962-8436|pmc=3866427|pmid=24324241}}</ref> ''Pure alexia'', also known as ''agnosic alexia'' or ''pure word blindness'', is one form of ] which makes up "the peripheral dyslexia" group.<ref>{{cite journal |author=Coslett HB |title=Acquired dyslexia |journal=Semin Neurol |volume=20 |issue=4 |pages=419–26 |year=2000 |pmid=11149697 |doi=10.1055/s-2000-13174 |s2cid=36969285 }}</ref> | |||
==Signs and symptoms== | |||
There are many definitions of dyslexia but no official consensus has been reached. | |||
{{See also|Characteristics of dyslexia}} | |||
In early childhood, symptoms that correlate with a later diagnosis of dyslexia include ] and a lack of ].<ref name=Handler2011/> A common myth closely associates dyslexia with ] and reading letters or words backwards.<ref name="LilienfeldLynn2011">{{cite book|url=https://books.google.com/books?id=8DlS0gfO_QUC&pg=PT88|title=50 Great Myths of Popular Psychology: Shattering Widespread Misconceptions about Human Behavior|last2=Lynn|first2=Steven Jay|last3=Ruscio|first3=John|last4=Beyerstein|first4=Barry L.|date=15 September 2011|publisher=John Wiley & Sons|isbn=978-1-4443-6074-5|pages=88–89|last1=Lilienfeld|first1=Scott O.|author-link1=Scott Lilienfeld|author-link4=Barry Beyerstein|access-date=19 May 2016|url-status=live|archive-url=https://web.archive.org/web/20170109130327/https://books.google.com/books?id=8DlS0gfO_QUC&pg=PT88|archive-date=9 January 2017}}</ref> These behaviors are seen in many children as they learn to read and write, and are not considered to be defining characteristics of dyslexia.<ref name=Handler2011/> | |||
The World Federation of Neurology defines dyslexia as "a disorder manifested by difficulty in learning to read despite conventional instruction, adequate intelligence and sociocultural opportunity".<ref>{{Cite web|url=http://www.avko.org/Info/dyslexia/what_is_dyslexia.htm |title=What Is Dyslexia? |publisher=AVKO Education Research Foundation |date= |accessdate=2010-07-05}}</ref> | |||
School-age children with dyslexia may exhibit ] of difficulty in identifying or generating ], or counting the number of ]s in words—both of which depend on phonological awareness.<ref name="DAss">{{cite web |title=Dyslexia and Related Disorders |date=January 2003 |website=Alabama Dyslexia Association |publisher=] |access-date=29 April 2015 |url=http://idaalabama.org/Facts/Dyslexia_and_Related.pdf |url-status=live |archive-url=https://web.archive.org/web/20160304124053/http://idaalabama.org/Facts/Dyslexia_and_Related.pdf |archive-date=4 March 2016 }}</ref> They may also show difficulty in segmenting words into individual sounds (such as sounding out the three sounds of ''k'', ''a'', and ''t'' in ''cat'') or may struggle to blend sounds, indicating reduced ].<ref name="PeerReid2014">{{cite book |last1=Peer |first1=Lindsay |last2=Reid |first2=Gavin |title=Multilingualism, Literacy and Dyslexia |url=https://books.google.com/books?id=-aoABAAAQBAJ&pg=PA219 |year=2014 |publisher=Routledge |isbn=978-1-136-60899-5 |page=219 |url-status=live |archive-url=https://web.archive.org/web/20170109204808/https://books.google.com/books?id=-aoABAAAQBAJ&pg=PA219 |archive-date=9 January 2017 }}</ref> | |||
] and the ] define dyslexia as "a reading disability resulting from the inability to process graphic symbols".<ref>{{Cite web|url=http://www.nlm.nih.gov/medlineplus/ency/article/001406.htm |title=Developmental reading disorder |publisher=MedlinePlus Medical Encyclopedia |date=2008-10-15 |accessdate=2010-07-05}}</ref> | |||
Difficulties with word retrieval or naming things is also associated with dyslexia.<ref name="Shaywitz2013a">{{cite book|author1=Shaywitz, Sally E.|author2=Shaywitz, Bennett A.|chapter=Chapter 34 Making a Hidden Disability Visible: What Has Been Learned from Neurobiological Studies of Dyslexia|editor1=Swanson, H. Lee|editor2=Harris, Karen R.|editor3=Graham, Steve|title=Handbook of Learning Disabilities|chapter-url=https://books.google.com/books?id=oakQfUuutVwC&pg=PA647|edition=2|year=2013|publisher=Guilford Press|isbn=978-1-4625-0856-3|url-status=live|archive-url=https://web.archive.org/web/20170109143943/https://books.google.com/books?id=oakQfUuutVwC&pg=PA647|archive-date=9 January 2017}}</ref>{{rp|647}} People with dyslexia are commonly poor ], a feature sometimes called ''dysorthographia'' or '']'', which depends on the skill of ].<ref name="Handler2011" /> | |||
The ] gives the following definition for dyslexia: <blockquote>"Dyslexia is a brain-based type of learning disability that specifically impairs a person's ability to read. These individuals typically read at levels significantly lower than expected despite having normal intelligence. Although the disorder varies from person to person, common characteristics among people with dyslexia are difficulty with spelling, phonological processing (the manipulation of sounds), and/or rapid visual-verbal responding. In adults, dyslexia usually occurs after a brain injury or in the context of dementia. It can also be inherited in some families, and recent studies have identified a number of genes that may predispose an individual to developing dyslexia".<ref name="ninds1"/></blockquote> | |||
Problems persist into adolescence and adulthood and may include difficulties with summarizing stories, memorization, reading aloud, or learning foreign languages. Adults with dyslexia can often read with good comprehension, though they tend to read more slowly than others without a learning difficulty and perform worse in ] tests or when reading nonsense words—a measure of phonological awareness.<ref>{{cite journal|last1=Jarrad|first1=Lum|title=Procedural learning is impaired in dyslexia: evidence from a meta-analysis of serial reaction time studies|journal=Research in Developmental Disabilities|date=October 2013|pages=3460–76|pmid=23920029|pmc=3784964|doi=10.1016/j.ridd.2013.07.017|volume=34|issue=10}}</ref> | |||
Other published definitions are purely descriptive or embody causal theories. Varying definitions are used for dyslexia from researchers and organizations around the world; it appears that this disorder encompasses a number of reading skills, deficits and difficulties with a number of causes rather than a single condition.<ref name= NRDC> | |||
{{Cite news | |||
| first=Michael Rice Dr Michael Rice (University of Cambridge, formerly Senior Research Officer, NRDC Institute of Education) with Greg Brooks Research Director, NRDC Sheffield, and Professor of Education, University of Sheffield | title = Developmental dyslexia in adults: a research review | date=2004-05-01 | publisher=National Research and Development Centre for Adult Literacy and Numeracy | url =http://www.nrdc.org.uk/projects_details.asp?ProjectID=75 | pages =*133–147 | accessdate = 2009-05-13 }}</ref><ref name='University'>{{Cite book|last=Brazeau-Ward |first=Louise |title=Dyslexia and the University |publisher=Canadian Dyslexia Centre |year=2001 |location=Canada |pages=1–3 |url=http://www.dyslexiaassociation.ca/english/files/universityanddyslexia.pdf |isbn=1-894964-71-3}}</ref> | |||
===Associated conditions=== | |||
Castles and Coltheart describe ] and surface types of developmental dyslexia by analogy to classical subtypes of ] (acquired dyslexia) which are classified according to the rate of errors in reading non-words.<ref name='Castles Coltheart'>{{Cite journal|author=Castles A, Coltheart M |title=Varieties of developmental dyslexia |journal=Cognition |volume=47 |issue=2 |pages=149–80 |year=1993 |month=May |pmid=8324999 |doi=10.1016/0010-0277(93)90003-E }}</ref><ref name='Habib'>{{Cite journal|author=Habib M |title=The neurological basis of developmental dyslexia: an overview and working hypothesis |journal=Brain |volume=123 |issue=12 |pages=2373–99 |year=2000 |month=December |pmid=11099442 |doi=10.1093/brain/123.12.2373 |url=http://brain.oxfordjournals.org/cgi/pmidlookup?view=long&pmid=11099442 }}</ref> However, the distinction between surface and phonological dyslexia has not replaced the old empirical terminology of dysphonetic versus dyseidetic types of dyslexia.<ref name='University'/><ref name='Habib'/><ref>{{Cite journal|doi=10.1111/j.1469-8749.1973.tb05180.x |author=Boder E |title=Developmental dyslexia: a diagnostic approach based on three atypical reading-spelling patterns |journal=Developmental Medicine and Child Neurology |volume=15 |issue=5 |pages=663–87 |year=1973 |month=October |pmid=4765237 }}</ref> The surface/phonological distinction is only descriptive, and devoid of any aetiological assumption as to the underlying brain mechanisms.<ref name=DevelopmentalDyslexia >{{Cite journal|author=Galaburda AM, Cestnick L |title= |language=Spanish; Castilian |journal=Rev Neurol |volume=36 Suppl 1 |issue= |pages=S3–9 |year=2003 |month=February |pmid=12599096 |doi= |url=}}</ref> In contrast, the dysphonetic/dyseidetic distinction refers to two different mechanisms; one that relates to a speech discrimination deficit, and another that relates to a visual perception impairment. | |||
Dyslexia often co-occurs with other learning disorders, but the reasons for this comorbidity have not been clearly identified.<ref>{{cite journal |title=Dyslexia, dysgraphia, procedural learning and the cerebellum |journal=Cortex |volume=47 |issue=1 |pages=117–27 |date=September 2009|pmid=19818437 |doi=10.1016/j.cortex.2009.08.016|last1=Nicolson |first1=R. I. |last2=Fawcett |first2=A. J.|s2cid=32228208 }}</ref> These associated disabilities include: | |||
; ]: A disorder involving difficulties with ] or ], sometimes due to problems with ]; it also can impede direction- or sequence-oriented processes, such as ] or carrying out repetitive tasks.<ref name=ReynoldsFletcherJanzen2007>{{cite book |last1=Reynolds |first1=Cecil R. |last2=Fletcher-Janzen |first2=Elaine |title=Encyclopedia of Special Education |date=2 January 2007 |publisher=John Wiley & Sons |isbn=978-0-471-67798-7 |page= }}</ref> In dyslexia, dysgraphia is often multifactorial, due to impaired letter-writing ], organizational and elaborative difficulties, and impaired visual word forming, which makes it more difficult to retrieve the visual picture of words required for spelling.<ref name=ReynoldsFletcherJanzen2007/> | |||
==Signs and symptoms== | |||
; ] (ADHD): A disorder characterized by problems sustaining attention, hyperactivity, or acting impulsively.<ref>{{cite web|url=http://www.nimh.nih.gov/health/topics/attention-deficit-hyperactivity-disorder-adhd/index.shtml|title=Attention Deficit Hyperactivity Disorder|date=March 2016|publisher=NIH: National Institute of Mental Health|access-date=26 July 2016|url-status=live|archive-url=https://web.archive.org/web/20160723192735/http://www.nimh.nih.gov/health/topics/attention-deficit-hyperactivity-disorder-adhd/index.shtml|archive-date=23 July 2016}}</ref> Dyslexia and ADHD commonly occur together.<ref name="Koo2013" /><ref name="ComerGould2010">{{cite book|url=https://books.google.com/books?id=ySIc1BcPJu8C&pg=RA1-PA233|title=Psychology Around Us|date=2011|publisher=RR Donnelley|isbn=978-0-471-38519-6|page=1|author1=Comer, Ronald|url-status=live|archive-url=https://web.archive.org/web/20160604000711/https://books.google.com/books?id=ySIc1BcPJu8C&pg=RA1-PA233|archive-date=4 June 2016}}</ref><ref>{{cite journal|last2=Gagliano|first2=A|last3=Curatolo|first3=P|year=2010|title=Comorbidity of ADHD and Dyslexia|url=http://pdfserve.informaworld.com/260009__925867416.pdf |archive-url=https://web.archive.org/web/20110810101321/http://pdfserve.informaworld.com/260009__925867416.pdf |archive-date=2011-08-10 |url-status=live|journal=Developmental Neuropsychology|volume=35|issue=5|pages=475–493|doi=10.1080/87565641.2010.494748|pmid=20721770|last1=Germanò|first1=E|s2cid=42046958}}</ref> Approximately 15%<ref name="Handler2011" /> or 12–24% of people with dyslexia have ADHD;<ref name="FatemiSartorius2008">{{cite book|url=https://books.google.com/books?id=RJOy1vy2RKQC&pg=PA308|title=The Medical Basis of Psychiatry|publisher=Springer Science & Business Media|year=2008|isbn=978-1-59745-252-6|edition=3rd |page=308|author1=Fatemi, S. Hossein|author2=Sartorius, Norman|author3=Clayton, Paula J.|author3-link=Paula Clayton|url-status=live|archive-url=https://web.archive.org/web/20170109101234/https://books.google.com/books?id=RJOy1vy2RKQC&pg=PA308|archive-date=9 January 2017}}</ref> and up to 35% of people with ADHD have dyslexia.<ref name="Handler2011" /> | |||
{{See also|Characteristics of dyslexia}} | |||
; ]: A listening disorder that affects the ability to process auditory information.<ref name="Capellini2007a">{{cite book|author=Capellini, Simone Aparecida|title=Neuropsycholinguistic Perspectives on Dyslexia and Other Learning Disabilities|url=https://books.google.com/books?id=uiEaMQVwyzYC&pg=PA94|year=2007|publisher=Nova Publishers|isbn=978-1-60021-537-7|page=94|url-status=live|archive-url=https://web.archive.org/web/20170109113545/https://books.google.com/books?id=uiEaMQVwyzYC&pg=PA94|archive-date=9 January 2017}}</ref><ref>{{cite journal |title=The diagnosis and management of auditory processing disorder|journal= Language, Speech, and Hearing Services in Schools|volume=42 |issue=3 |pages=303–8 |date=July 2011 |pmid=21757566 |doi=10.1044/0161-1461(2011/10-0032)|last1=Moore |first1=D. R.}}</ref> This can lead to problems with ] and auditory ]. Many people with dyslexia have auditory processing problems, and may develop their own ] to compensate for this type of deficit. Some research suggests that auditory processing skills could be the primary shortfall in dyslexia.<ref name=Pammer2014>{{cite journal|last1=Pammer|first1=Kristen|title=Brain mechanisms and reading remediation: more questions than answers.|journal=Scientifica|date=January 2014|pmid=24527259|pmc=3913493|doi=10.1155/2014/802741|volume=2014|pages=802741|doi-access=free}}</ref><ref>{{cite journal|last1=Law|first1=J|title=relationship of phonological ability, speech perception, and auditory perception in adults with dyslexia|journal=Frontiers in Human Neuroscience|date=2014|pmid=25071512|pmc=4078926|doi=10.3389/fnhum.2014.00482|volume=8|pages=482|doi-access=free}}</ref> | |||
; ]: A neurological condition characterized by difficulty in carrying out routine tasks involving balance, fine-] and ] coordination; difficulty in the use of speech sounds; and problems with ] and organization.<ref name=Pickering2012>{{cite book|author=Susan J. Pickering|chapter=Chapter 2. Working Memory in Dyslexia|editor1=Alloway, Tracy Packiam|editor2=Gathercole, Susan E.|title=Working Memory and Neurodevelopmental Disorders|chapter-url=https://books.google.com/books?id=IoXidOBdNpMC&pg=PA29|year=2012|publisher=Psychology Press|isbn=978-1-135-42134-2|url-status=live|archive-url=https://web.archive.org/web/20170109194637/https://books.google.com/books?id=IoXidOBdNpMC&pg=PA29|archive-date=9 January 2017}}</ref> | |||
== Causes == | |||
The symptoms of dyslexia vary according to the severity of the disorder as well as the age of the individual. | |||
] | |||
Researchers have been trying to find the neurobiological basis of dyslexia since the condition was first identified in 1881.<ref name="Oswald Berkhan ref 1" /><ref name="ReidFawcett2008x">{{cite book|author1=Reid, Gavin|author2=Fawcett, Angela|author3=Manis, Frank|author4=Siegel, Linda|title=The SAGE Handbook of Dyslexia|url=https://books.google.com/books?id=937rqz4Ryc8C&pg=PA127|year=2008|publisher=SAGE Publications|isbn=978-1-84860-037-9|page=127|url-status=live|archive-url=https://web.archive.org/web/20170109200307/https://books.google.com/books?id=937rqz4Ryc8C&pg=PA127|archive-date=9 January 2017}}</ref> For example, some have tried to associate the common problem among people with dyslexia of not being able to see letters clearly to abnormal development of their visual nerve cells.<ref name="Stein2014" >{{cite journal |first1=John |last1=Stein |year=2014 |title=Dyslexia: the Role of Vision and Visual Attention |journal=Current Developmental Disorders Reports |volume=1 |issue=4 |pages=267–80 |pmid=25346883 |pmc=4203994 |doi=10.1007/s40474-014-0030-6}}</ref> | |||
=== |
===Neuroanatomy=== | ||
] techniques, such as ] (]) and ] (PET), have shown a correlation between both functional and structural differences in the brains of children with reading difficulties.<ref name="Whitaker2010r">{{cite book|author=Whitaker, Harry A.|title=Concise Encyclopedia of Brain and Language|url=https://books.google.com/books?id=GNcDiRV2jJQC&pg=PA180|year=2010|publisher=Elsevier|isbn=978-0-08-096499-7|page=180|url-status=live|archive-url=https://web.archive.org/web/20170109173223/https://books.google.com/books?id=GNcDiRV2jJQC&pg=PA180|archive-date=9 January 2017}}</ref> Some people with dyslexia show less activation in parts of the left hemisphere of the brain involved with reading, such as the ], ], and the middle and ].<ref name=Pammer2014/> Over the past decade, brain activation studies using PET to study language have produced a breakthrough in the understanding of the neural basis of language. Neural bases for the visual ] and for auditory verbal ] components have been proposed,<ref>{{cite journal|last1=Price|first1=cathy|title=A Review and Synthesis of the first 20 years of Pet and fMRI studies of heard Speech, Spoken Language and Reading|journal=NeuroImage|date=16 August 2012|volume=62 |issue=2|pages=816–847|doi=10.1016/j.neuroimage.2012.04.062|pmid=22584224|pmc=3398395}}</ref> with some implication that the observed neural manifestation of developmental dyslexia is task-specific (i.e., functional rather than structural). fMRIs of people with dyslexia indicate an interactive role of the ] and cerebral cortex as well as other brain structures in reading.<ref>{{cite journal|last1=Sharifi|first1=S|title=Neuroimaging essentials in essential tremor: a systematic review.|journal=NeuroImage: Clinical|date=May 2014|pages=217–231|pmid=25068111|pmc=4110352|doi=10.1016/j.nicl.2014.05.003|volume=5}}</ref><ref>{{cite journal|last1=Brandler|first1=William|title=The genetic relationship between handedness and neurodevelopmental disorders|journal=Trends in Molecular Medicine|date=February 2014|pages=83–90|pmid=24275328|pmc=3969300|doi=10.1016/j.molmed.2013.10.008|volume=20|issue=2}}</ref> | |||
It is difficult to obtain a certain diagnosis of dyslexia before a child begins school, but many dyslexic individuals have a history of difficulties that began well before kindergarten. Children who exhibit these symptoms early in life have a higher likelihood of being diagnosed as dyslexic than other children. These symptoms include: | |||
* delays in speech<ref name='Huc-Chabrolle' >{{Cite journal|author=Huc-Chabrolle M, Barthez MA, Tripi G, Barthélémy C, Bonnet-Brilhault F |title= |language=French |journal=Encephale |volume=36 |issue=2 |pages=172–9 |year=2010 |month=April |pmid=20434636 |doi=10.1016/j.encep.2009.02.005 |url=}}</ref> | |||
* slow learning of new words | |||
* not crawling{{Citation needed|date=November 2010}} | |||
* difficulty in rhyming words, as in nursery rhymes | |||
* low letter knowledge | |||
* letter reversal or mirror writing<ref>{{Cite journal|author=Schott GD, Schott JM |title=Mirror writing, left-handedness, and leftward scripts |journal=Arch. Neurol. |volume=61 |issue=12 |pages=1849–51 |year=2004 |month=December |pmid=15596604 |doi=10.1001/archneur.61.12.1849 |url=http://archneur.ama-assn.org/cgi/content/full/61/12/1849}}</ref><ref>{{Cite journal|author=Schott GD |title=Mirror writing: neurological reflections on an unusual phenomenon |journal=J. Neurol. Neurosurg. Psychiatr. |volume=78 |issue=1 |pages=5–13 |year=2007 |month=January |pmid=16963501 |pmc=2117809 |doi=10.1136/jnnp.2006.094870 |url=http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2117809/?tool=pubmed}}</ref> (for example, "Я" instead of "R") | |||
The cerebellar theory of dyslexia proposes that impairment of cerebellum-controlled muscle movement affects the formation of words by the tongue and facial muscles, resulting in the ] problems that some people with dyslexia experience. The cerebellum is also involved in the ] of some tasks, such as reading.<ref>{{cite book|last1=Cain|first1=Kate|title=Reading development and difficulties|date=2010|publisher=TJ International|page=134|edition=1st|url=https://books.google.com/books?id=FT6RALjOr9QC&q=cerebellar+theory+of+dyslexia&pg=PA134|access-date=21 March 2015|isbn=9781405151559}}</ref> The fact that some children with dyslexia have motor task and balance impairments could be consistent with a cerebellar role in their reading difficulties. However, the cerebellar theory has not been supported by controlled research studies.<ref>{{cite book|last1=Levav|first1=Itzhak|title=Psychiatric and Behavioral Disorders in Israel: From Epidemiology to Mental health|date=2009|publisher=Green Publishing|page=52|url=https://books.google.com/books?id=W2RzffMnpg8C&q=cerebellar+theory+of+dyslexia&pg=PA52|access-date=21 March 2015|isbn=9789652294685}}</ref> | |||
===Early primary school children=== | |||
* Difficulty learning the alphabet or letters order | |||
* Difficulty with associating sounds with the letters that represent them (sound-symbol correspondence) | |||
* Difficulty identifying or generating rhyming words, or counting syllables in words<ref name='Facoetti'>{{Cite journal| title = Visual spatial attention and speech segmentation are both impaired in preschoolers at familial risk for developmental dyslexia | journal = Dyslexia | date = 2010-07-27 | first = Andrea | last = Facoetti | coauthors = Nicola Corradi, Milena Ruffino, Simone Gori, Marco Zorzi| pmid = 20680993 | volume = 16 | issue = 3 | pages = 226–239| doi = 10.1002/dys.413 | url = http://onlinelibrary.wiley.com/doi/10.1002/dys.413/abstract | accessdate = 2010-09-08}}</ref> (]) | |||
* Difficulty segmenting words into individual sounds, or blending sounds to make words<ref>{{Cite journal|author=Lovio R, Näätänen R, Kujala T |title=Abnormal pattern of cortical speech feature discrimination in 6-year-old children at risk for dyslexia |journal=Brain Res. |volume=1335 |issue= |pages=53–62 |year=2010 |month=June |pmid=20381471 |doi=10.1016/j.brainres.2010.03.097 |url=http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6SYR-4YT6D8D-D&_user=10&_coverDate=06%2F04%2F2010&_rdoc=1&_fmt=high&_orig=search&_sort=d&_docanchor=&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=37596598eee2566363de236b9a31f630}}</ref> (]) | |||
* Difficulty with word retrieval or naming problems<ref>Ho CS-H, Lai DN-Ch. (1999). Naming-speed deficits and phonological memory deficits in Chinese developmental dyslexia. J Learn Disabil, 2:173–86. {{doi|10.1016/S1041-6080(00)80004-7}}</ref><ref>Kobayashi MS, Haynes CW, Macaruso P, Hook PE, Kato J. (2005). Effects of mora deletion, nonword repetition, rapid naming, and visual search performance on beginning reading in Japanese. Ann Dyslexia. 55(1):105-28. PMID 16107782</ref><ref>Jones MW, Branigan HP, Kelly ML.(2009). Dyslexic and nondyslexic reading fluency: Rapid automatized naming and the importance of continuous lists. Psychonomic Bulletin & Review. 16 (3):567-572. | |||
{{doi|10.3758/PBR.16.3.567}}</ref> | |||
* Difficulty learning to decode written words | |||
* Difficulty distinguishing between similar sounds in words; mixing up sounds in polysyllabic words (auditory discrimination) (for example, "aminal" for animal, "bisghetti" for spaghetti) | |||
===Genetics=== | |||
===Older primary school children=== | |||
Research into potential genetic causes of dyslexia has its roots in post-autopsy examination of the brains of people with dyslexia.<ref name="Stein2014" /> Observed anatomical differences in the ]s of such brains include microscopic ] malformations known as ], and more rarely, ] micro-malformations, and ]—a smaller than usual size for the gyrus.<ref name="Faust2012">{{cite book|author=Faust, Miriam|title=The Handbook of the Neuropsychology of Language|url=https://books.google.com/books?id=UEWVqdNFL4cC&pg=PA941|year=2012|publisher=John Wiley & Sons|isbn=978-1-4443-3040-3|pages=941–43|url-status=live|archive-url=https://web.archive.org/web/20170109200538/https://books.google.com/books?id=UEWVqdNFL4cC&pg=PA941|archive-date=9 January 2017}}</ref> The previously cited studies and others<ref>{{cite journal|last1=Benitez|first1=A|title=Neurobiology and neurogenetics of dyslexia|journal=Neurology (In Spanish)|date=November 2010|pmid=21093706|doi=10.1016/j.nrl.2009.12.010|volume=25|issue=9|pages=563–81|doi-access=}}</ref> suggest that abnormal cortical development, presumed to occur before or during the sixth month of ] brain development, may have caused the abnormalities. Abnormal cell formations in people with dyslexia have also been reported in non-language cerebral and subcortical brain structures.<ref>{{cite journal|last1=Kere|first1=Julia|title=The molecular genetics and neurobiology of developmental dyslexia as model of a complex phenotype|journal=Biochemical and Biophysical Research Communications|date=September 2014|pages=236–43|doi=10.1016/j.bbrc.2014.07.102|pmid=25078623|volume=452|issue=2|doi-access=free}}</ref> Several genes have been associated with dyslexia, including ]<ref name="Marshall2012v">{{cite book|author=Marshall, Chloë R.|title=Current Issues in Developmental Disorders|url=https://books.google.com/books?id=jHqYP39rI40C&pg=PA53|year=2012|publisher=Psychology Press|isbn=978-1-136-23067-7|pages=53–56|url-status=live|archive-url=https://web.archive.org/web/20170109103320/https://books.google.com/books?id=jHqYP39rI40C&pg=PA53|archive-date=9 January 2017}}</ref> and ]<ref>{{cite journal |vauthors=Paracchini S, Thomas A, Castro S, Lai C, Paramasivam M, Wang Y, Keating BJ, Taylor JM, Hacking DF, Scerri T, Francks C, Richardson AJ, Wade-Martins R, Stein JF, Knight JC, Copp AJ, LoTurco J, Monaco AP |title=The chromosome 6p22 haplotype associated with dyslexia reduces the expression of KIAA0319, a novel gene involved in neuronal migration|journal=Human Molecular Genetics|volume=15|issue=10|date=15 May 2006|pages=1659–1666|doi=10.1093/hmg/ddl089|pmid=16600991|doi-access=free|hdl=11858/00-001M-0000-0012-C979-F|hdl-access=free}}</ref> on ], and ] on ].<ref name="Rosen2013v">{{cite book|author=Rosen, Glenn D.|title=The Dyslexic Brain: New Pathways in Neuroscience Discovery|url=https://books.google.com/books?id=ZHBxBEekGSkC&pg=PA342|year=2013|publisher=Psychology Press|isbn=978-1-134-81550-0|page=342|url-status=live|archive-url=https://web.archive.org/web/20170109143349/https://books.google.com/books?id=ZHBxBEekGSkC&pg=PA342|archive-date=9 January 2017}}</ref> | |||
* Slow or inaccurate reading (although these individuals can read to an extent). | |||
* Very poor spelling<ref>{{Cite journal|author=Ise E, Schulte-Körne G |title=Spelling deficits in dyslexia: evaluation of an orthographic spelling training |journal=Ann Dyslexia |volume=60 |issue=1 |pages=18–39 |year=2010 |month=June |pmid=20352378 |doi=10.1007/s11881-010-0035-8}}</ref> which has been called dysorthographia (]) | |||
* Difficulty reading out loud, reading words in the wrong order, skipping words and sometimes saying a word similar to another word (]) | |||
* Difficulty associating individual words with their correct meanings | |||
* Difficulty with time keeping and concept of time when doing a certain task | |||
* Difficulty with organization skills (]) | |||
* Children with dyslexia may fail to see (and occasionally to hear) similarities and differences in letters and words, may not recognize the spacing that organizes letters into separate words, and may be unable to sound out the pronunciation of an unfamiliar word (auditory processing disorder). | |||
===Gene–environment interaction=== | |||
===Secondary school children and adults=== | |||
The contribution of gene–environment interaction to reading disability has been intensely studied using ], which estimate the proportion of variance associated with a person's environment and the proportion associated with their genes. Both environmental and genetic factors appear to contribute to reading development. Studies examining the influence of environmental factors such as parental education<ref>{{cite journal |title=Parental Education Moderates Genetic Influences on Reading Disability |journal=Psychol. Sci. |volume=19 |issue=11 |pages=1124–30 |date=November 2008 |pmid=19076484 |pmc=2605635 |doi=10.1111/j.1467-9280.2008.02213.x |last1=Friend |first1=A |last2=Defries |first2=J. C. |last3=Olson |first3=R. K.}}</ref> and teaching quality<ref>{{cite journal |bibcode=2010Sci...328..512T|title=Teacher Quality Moderates the Genetic Effects on Early Reading|journal=Science|volume=328|issue=5977|pages=512–4|last1=Taylor|first1=J.|last2=Roehrig|first2=A. D.|last3=Hensler|first3=B. Soden|last4=Connor|first4=C. M.|last5=Schatschneider|first5=C.|year=2010|doi=10.1126/science.1186149|pmid=20413504|pmc=2905841}}</ref> have determined that genetics have greater influence in supportive, rather than less optimal, environments.<ref name=pmid19209992>{{cite journal |last1=Pennington |first1=Bruce F. |last2=McGrath |first2=Lauren M. |last3=Rosenberg |first3=Jenni |last4=Barnard |first4=Holly |last5=Smith |first5=Shelley D. |last6=Willcutt |first6=Erik G. |last7=Friend |first7=Angela |last8=Defries |first8=John C. |last9=Olson |first9=Richard K. |date=January 2009 |title=Gene × Environment Interactions in Reading Disability and Attention-Deficit/Hyperactivity Disorder |journal=Developmental Psychology |volume=45 |issue=1 |pages=77–89 |doi=10.1037/a0014549 |pmid=19209992 |pmc=2743891}}</ref> However, more optimal conditions may just allow those genetic risk factors to account for more of the variance in outcome because the environmental risk factors have been minimized.<ref name=pmid19209992/> | |||
Some dyslexics are able to disguise their weaknesses (even from themselves) and often do acceptably well - or better - at GCSE level (U.K. - at 16 years old). Many students reach higher education before they encounter the threshold at which they are no longer able to compensate for their learning weaknesses. | |||
As environment plays a large role in learning and memory, it is likely that ] modifications play an important role in reading ability. Measures of ], ], and ] in the human periphery are used to study epigenetic processes; however, all of these have limitations in the extrapolation of results for application to the human brain.<ref>{{cite journal |last1=Roth |first1=Tania L. |last2=Roth |first2=Eric D. |last3=Sweatt |first3=J. David |s2cid=23229766 |date=September 2010 |title=Epigenetic regulation of genes in learning and memory |journal=Essays in Biochemistry |volume=48 |issue=1 |pages=263–74 |pmid=20822498 |doi=10.1042/bse0480263}}</ref><ref>{{cite journal |last1=Smith |first1=Shelley D. |title=Approach to epigenetic analysis in language disorders |journal=Journal of Neurodevelopmental Disorders |date=December 2011 |volume=3 |issue=4 |pages=356–364 |doi=10.1007/s11689-011-9099-y |pmid=22113455 |pmc=3261263 |issn=1866-1947}}</ref> | |||
One common misconception about dyslexia is that dyslexic readers write words backwards or move letters around when reading. In fact, this only occurs in a very small population of dyslexic readers. Dyslexic people are better identified by writing that does not seem to match their level of intelligence from prior observations. Additionally, dyslexic people often substitute similar-looking, but unrelated, words in place of the ones intended (what/want, say/saw, help/held, run/fun, fell/fall, to/too, etc.){{Citation needed|date=July 2010|reason=I'm sure that this is a true statement, but it should be cited to a reliable source.}}. | |||
=== |
====Language==== | ||
The ] of a language directly affects how difficult it is to learn to read it.<ref name="BrunswickMcDougall2010"> | |||
Several learning disabilities often occur with dyslexia, but it is unclear whether these learning disabilities share underlying neurological causes with dyslexia.<ref>{{Cite journal|author=Nicolson RI, Fawcett AJ |title=Dyslexia, dysgraphia, procedural learning and the cerebellum |journal=Cortex |volume= |issue= |pages= |year=2009 |month=September |pmid=19818437 |doi=10.1016/j.cortex.2009.08.016 |url=}}</ref> These disabilities include, but are not limited to: | |||
Paulesu, Eraldo; Brunswick, Nicola and Paganelli, Federica (2010). "Cross-cultural differences in unimpaired and dyslexic reading: Behavioral and functional anatomical observations in readers of regular and irregular orthographies. Chapter 12 in {{webarchive|url=https://web.archive.org/web/20170109135414/https://books.google.com/books?id=0vJ5AgAAQBAJ&pg=PA266 |date=9 January 2017 }}. Eds. Nicola Brunswick, Siné McDougall, and Paul de Mornay Davies. Psychology Press. {{ISBN|9781135167813}}</ref>{{rp|266}} English and French have comparatively "deep" ] within the ] ], with complex structures employing spelling patterns on several levels: letter-sound correspondence, syllables, and ]s.<ref name="DickinsonNeuman2013">{{cite book|author=Juel, Connie|chapter=The Impact of Early School Experiences on Initial Reading|editor1=David K. Dickinson|editor2=Susan B. Neuman|title=Handbook of Early Literacy Research|chapter-url=https://books.google.com/books?id=_chXAQAAQBAJ&pg=PA421|year=2013|publisher=Guilford Publications|isbn=978-1-4625-1470-0|url-status=live|archive-url=https://web.archive.org/web/20170109162332/https://books.google.com/books?id=_chXAQAAQBAJ&pg=PA421|archive-date=9 January 2017|df=dmy-all}}</ref>{{rp|421}} Languages such as Spanish, Italian and Finnish primarily employ letter-sound correspondence—so-called "shallow" orthographies—which makes them easier to learn for people with dyslexia.<ref name="BrunswickMcDougall2010"/>{{rp|266}} ]ic writing systems, such as ], have extensive symbol use; and these also pose problems for dyslexic learners.<ref>{{cite journal|title = Annual Research Review: The nature and classification of reading disorders – a commentary on proposals for DSM-5|journal = Journal of Child Psychology and Psychiatry, and Allied Disciplines|date = 1 May 2012|pmc = 3492851|pmid = 22141434|pages = 593–607|volume = 53|issue = 5|doi = 10.1111/j.1469-7610.2011.02495.x|first1 = Margaret J|last1 = Snowling|first2 = Charles|last2 = Hulme}}</ref> | |||
* ]— a speech fluency disorder involving both the rate and rhythm of speech, resulting in impaired speech intelligibility. Speech is erratic and nonrhythmic, consisting of rapid and jerky spurts that usually involve faulty phrasing. The personality of people with cluttering bears striking resemblance to the personalities of those with learning disabilities.<ref>{{Cite journal|first1=Ruth J. |last1=Tiger |date=1 January 1980 |title=Cluttering as a Complex of Learning Disabilities |journal=Language, Speech, and Hearing Services in Schools |volume=11 |pages=3–14 |url=http://lshss.asha.org/cgi/content/abstract/11/1/3 |issue=1 |last2=Irvine |first2=Terry L. |last3=Reis |first3=Ronald P.}}</ref> | |||
* ]— a disorder which expresses itself primarily through writing or typing, although in some cases it may also affect ] direction or sequence oriented processes such as tying knots or carrying out a repetitive task. Dysgraphia is distinct from ] in that the person may have the word to be written or the proper order of steps in mind clearly, but carries the sequence out in the wrong order. | |||
* ]— a neurological condition characterized by a problem with learning fundamentals and one or more of the basic numerical skills. Often people with this condition can understand very complex mathematical concepts and principles but have difficulty processing formulas or even basic addition and subtraction. | |||
== |
==Pathophysiology== | ||
] | |||
{{Main|Theories of dyslexia}} | |||
The following theories should not be viewed as competing, but viewed as theories trying to explain the underlying causes of a similar set of symptoms from a variety of research perspectives and background.<ref name=theories>{{Cite journal|author=Ramus F, Rosen S, Dakin SC |title=Theories of developmental dyslexia: insights from a multiple case study of dyslexic adults |journal=Brain |volume=126 |issue=4 |pages=841–65 |year=2003 |month=April |pmid=12615643 |doi=10.1093/brain/awg076 |url=http://brain.oxfordjournals.org/cgi/pmidlookup?view=long&pmid=12615643 }}</ref><!--<ref name=theories/>--><ref>{{Cite journal|author=Nicolson RI, Fawcett AJ |title=Procedural learning difficulties: reuniting the developmental disorders? |journal=Trends Neurosci. |volume=30 |issue=4 |pages=135–41 |year=2007 |month=April |pmid=17328970 |doi=10.1016/j.tins.2007.02.003 |url=}}</ref> | |||
For most people who are right-hand dominant, the left hemisphere of their brain is more specialized for ]. With regard to the mechanism of dyslexia, fMRI studies suggest that this specialization is less pronounced or absent in people with dyslexia. In other studies, dyslexia is correlated with anatomical differences in the ], the bundle of nerve fibers that connects the left and right hemispheres.<ref name="habi">{{cite book |last1=Habib |first1=Michael |title=Pediatric Neurology Part I |volume=111 |chapter=Dyslexia |date=2013 |pages=229–235 |chapter-url=https://www.sciencedirect.com/science/article/pii/B9780444528919000233 |access-date=19 December 2018 |language=en|doi=10.1016/B978-0-444-52891-9.00023-3 |pmid=23622168 |series=Handbook of Clinical Neurology |isbn=9780444528919 }}</ref> | |||
;Cerebellar theory | |||
The Cerebellar Theory asserts that a mildly dysfunctional ] can cause dyslexia. The cerebellum contributes to motor control during the ] of speech, and the Cerebellar Theory proposes that articulation problems can contribute to the phonological processing deficits that can cause dyslexia. The Cerebellum also contributes to the automatisation of learnt behaviors, which includes learning the grapheme–phoneme relationships when reading text. | |||
<ref name=theories/><ref>{{Cite journal|author=Stoodley CJ, Stein JF |title=The cerebellum and dyslexia |journal=Cortex |volume= |issue= |pages= |year=2009 |month=October |pmid=20060110 |doi=10.1016/j.cortex.2009.10.005 |url=}}</ref> | |||
Data via diffusion tensor MRI indicate changes in connectivity or in gray matter density in areas related to reading and language. Finally, the left ] has shown differences in phonological processing in people with dyslexia.<ref name=habi/> Neurophysiological and imaging procedures are being used to ascertain phenotypic characteristics in people with dyslexia, thus identifying the effects of dyslexia-related genes.<ref>{{cite journal|title = Genetics of dyslexia: the evolving landscape|journal = Journal of Medical Genetics|date = 2007|pmc = 2597981|pmid = 17307837|pages = 289–297|volume = 44|issue = 5|doi = 10.1136/jmg.2006.046516|first1 = Johannes|last1 = Schumacher|first2 = Per|last2 = Hoffmann|first3 = Christine|last3 = Schmäl|first4 = Gerd|last4 = Schulte-Körne|first5 = Markus M|last5 = Nöthen}}</ref> | |||
;Evolutionary hypothesis | |||
This theory considers that reading is an unnatural act carried out by humans for an exceedingly brief period in our evolutionary history. It has been less than a hundred years that western societies promoted reading to the mass population and therefore the forces that shape our reading behavior have been weak. Many areas of the world still do not even have access to reading for the majority of the population.<ref>{{Cite journal|author=Dalby JT |title=An ultimate view of reading ability |journal=The International Journal of Neuroscience |volume=30 |issue=3 |pages=227–30 |year=1986 |month=September |pmid=3759349 |doi=10.3109/00207458608985671 }}</ref> | |||
===Dual route theory=== | |||
The Magnocellular theory attempts to unify the Cerebellar Theory, the Phonological Theory, the Rapid Auditory Processing Theory, and the Visual Theory. The Magnocellular theory proposes that the ] dysfunction is not only restricted to the visual pathways but also includes auditory and tactile ].<ref name=theories/><ref>{{Cite journal|author=Ray NJ, Fowler S, Stein JF |title=Yellow filters can improve magnocellular function: motion sensitivity, convergence, accommodation, and reading |journal=Ann. N. Y. Acad. Sci. |volume=1039 |issue= |pages=283–93 |year=2005 |month=April |pmid=15826982 |doi=10.1196/annals.1325.027 |url=}}</ref> | |||
The dual-route theory of ] aloud was first described in the early 1970s.<ref name="Pritchard 2012">{{cite journal |author=Pritchard SC, Coltheart M, Palethorpe S, Castles A |title=Nonword reading: comparing dual-route cascaded and connectionist dual-process models with human data |journal=J Exp Psychol Hum Percept Perform |volume=38 |issue=5 |pages=1268–88 |date=October 2012 |pmid=22309087 |doi=10.1037/a0026703|last2=Coltheart |last3=Palethorpe |last4=Castles}}</ref> This theory suggests that two separate mental mechanisms, or cognitive routes, are involved in reading aloud.<ref name="EysenckKeane2013z">{{cite book|author1=Eysenck, Michael|author2=Keane, Mark T.|title=Cognitive Psychology 6e|url=https://books.google.com/books?id=U-IF8PAa_jIC&pg=PA373|year=2013|publisher=Psychology Press|isbn=978-1-134-44046-7|page=373|url-status=live|archive-url=https://web.archive.org/web/20170109123837/https://books.google.com/books?id=U-IF8PAa_jIC&pg=PA373|archive-date=9 January 2017}}</ref> One mechanism is the lexical route, which is the process whereby skilled readers can recognize known words by sight alone, through a "dictionary" lookup procedure.<ref name="EysenckKeane2013">{{cite book|author1=Eysenck, Michael|author2=Keane, Mark T.|title=Cognitive Psychology 6e|url=https://books.google.com/books?id=U-IF8PAa_jIC&pg=PA450|year=2013|publisher=Psychology Press|isbn=978-1-134-44046-7|page=450|url-status=live|archive-url=https://web.archive.org/web/20170109170422/https://books.google.com/books?id=U-IF8PAa_jIC&pg=PA450|archive-date=9 January 2017}}</ref> The other mechanism is the nonlexical or sublexical route, which is the process whereby the reader can "sound out" a written word.<ref name="EysenckKeane2013"/><ref name="HulmeJoshi2012">{{cite book |last1=Hulme |first1=Charles |last2=Joshi |first2=R. Malatesha |last3=Snowling |first3=Margaret J. |title=Reading and Spelling: Development and Disorders |url=https://books.google.com/books?id=MumCCKK4JR8C&pg=PT151 |year=2012 |publisher=Routledge |isbn=978-1-136-49807-7 |page=151 |url-status=live |archive-url=https://web.archive.org/web/20170109141419/https://books.google.com/books?id=MumCCKK4JR8C&pg=PT151 |archive-date=9 January 2017 }}</ref> This is done by identifying the word's constituent parts (letters, ], ]) and applying knowledge of how these parts are associated with each other, for example, how a string of neighboring letters sound together.<ref name="Pritchard 2012" /> The dual-route system could explain the different rates of dyslexia occurrence between different languages (e.g., the consistency of phonological rules in the Spanish language could account for the fact that Spanish-speaking children show a higher level of performance in non-word reading, when compared to English-speakers).<ref name="BrunswickMcDougall2010"/><ref>{{cite journal|last1=Sprenger-Charolles|first1=Liliane|title=Prevalence and Reliability of Phonological, Surface, and Mixed Profiles in Dyslexia: A Review of Studies Conducted in Languages Varying in Orthographic Depth|journal=Scientific Studies of Reading|date=2011|pages=498–521|doi=10.1080/10888438.2010.524463|volume=15|issue=6|s2cid=15227374|url=https://hal.archives-ouvertes.fr/hal-00733553|url-status=live|archive-url=https://web.archive.org/web/20170830150246/https://hal.archives-ouvertes.fr/hal-00733553|archive-date=30 August 2017}}</ref> | |||
;Naming speed deficit and double deficit theories | |||
The speed with which an individual can engage in the ] of familiar objects or letters is a strong predictor of dyslexia.<ref>{{Cite journal|author=Denckla MB, Rudel RG |title=Rapid "automatized" naming (R.A.N): dyslexia differentiated from other learning disabilities |journal=Neuropsychologia |volume=14 |issue=4 |pages=471–9 |year=1976 |pmid=995240 |doi=10.1016/0028-3932(76)90075-0 }}</ref> Slow naming speed can be identified as early as kindergarten and persists in adults with dyslexia. | |||
==Diagnosis== | |||
A deficit in naming speed is hypothesized to represent a deficit that is separate from phonological processing deficit. Wolf identified four types of readers: readers with no deficits, readers with phonological processing deficit, readers with naming speed deficit, and readers with double deficit (that is, problems both with phonological processing and naming speed). Students with double deficits are most likely to have some sort of severe reading impairment. | |||
Dyslexia is a heterogeneous, dimensional learning disorder that impairs accurate and fluent word reading and spelling.<ref>{{cite journal|last1=Boada|first1=Richard|last2=Willcutt|first2=Erik G.|last3=Pennington|first3=Bruce F.|s2cid=43200465|date=2012|title=Understanding the Comorbidity Between Dyslexia and Attention-Deficit/Hyperactivity Disorder|journal=Topics in Language Disorders|quote=... Pennington proposed a multiple deficit model for complex disorders like dyslexia, hypothesizing that such complex disorders are heterogeneous conditions that arise from the additive and interactive effects of multiple genetic and environmental risk factors, which then lead to weaknesses in multiple cognitive domains.|volume=32|issue=3|page=270|doi=10.1097/tld.0b013e31826203ac}}</ref><ref>{{cite journal|last=Pennington|first=B|date=September 2006|title=From single to multiple deficit models of developmental disorders|journal=Cognition|volume=101|issue=2|pages=385–413|doi=10.1016/j.cognition.2006.04.008|pmid=16844106|s2cid=7433822}}</ref> Typical—but not universal—features include difficulties with phonological awareness; inefficient and often inaccurate processing of sounds in oral language (''phonological processing''); and verbal working memory deficits.<ref>{{cite journal|last1=Peterson|first1=Robin L.|last2=Pennington|first2=Bruce F.|date=28 March 2015|title=Developmental Dyslexia|journal=Annual Review of Clinical Psychology|volume=11|issue=1|pages=283–307|doi=10.1146/annurev-clinpsy-032814-112842|pmid=25594880|ssrn=2588407}}</ref><ref name="very-short">Snowling, Margaret J. ''Dyslexia: A Very Short Introduction''. Oxford University Press, 2019. {{ISBN|9780192550422}}</ref> | |||
Distinguishing among these deficits has important implications for instructional intervention. If students with double deficits receive instruction only in phonological processing, they are only receiving part of what they need.<ref>{{Cite book|last=Birsh |first=Judith R. |year=2005 |chapter=Alphabet knowledge: letter recognition, naming and sequencing |editor=Judith R. Birsh |title=Multisensory Teaching of Basic Language Skills |page=119 |publisher=Paul H. Brookes Publishing |location=Baltimore, Maryland |isbn=978-1-55766-678-5 | oclc = 234335596}}</ref> | |||
Dyslexia is a ], subcategorized in diagnostic guides as a ''learning disorder with impairment in reading'' (ICD-11 prefixes "developmental" to "learning disorder"; DSM-5 uses "specific").<ref>{{cite web|url=https://icd.who.int/browse11/l-m/en#/http://id.who.int/icd/entity/1008636089|title=6A03.0 Developmental learning disorder with impairment in reading|work=International Classification of Diseases and Related Health Problems, 11th rev. (ICD-11) (Mortality and Morbidity Statistics)|publisher=World Health Organization|access-date=7 October 2019}}</ref><ref>{{cite book|title=Diagnostic and statistical manual of mental disorders : DSM-5.|date=2013|publisher=American Psychiatric Association|others=DSM-5 Task Force.|quote=Specific Learning Disorder with impairment in reading ... Dyslexia is an alternative term used to refer to a pattern of learning difficulties characterized by problems with accurate or fluent word recognition, poor decoding, and poor spelling abilities.|isbn=9780890425541|edition=5th|location=Arlington, VA|oclc=830807378|url-access=registration|url=https://archive.org/details/diagnosticstatis0005unse}}</ref><ref>{{cite journal|last1=FragaGonzález|first1=Gorka|last2=Karipidis|first2=Iliana|last3=Tijms|first3=Jurgen|date=19 October 2018|title=Dyslexia as a Neurodevelopmental Disorder and What Makes It Different from a Chess Disorder|journal=Brain Sciences|volume=8|issue=10|pages=189|doi=10.3390/brainsci8100189|issn=2076-3425|pmc=6209961|pmid=30347764|doi-access=free}}</ref> Dyslexia is not a problem with ]. ] often arise secondary to learning difficulties.<ref name="Campbell2009">{{cite book|last1=Campbell|first1=Robert Jean|title=Campbell's Psychiatric Dictionary|url=https://books.google.com/books?id=kpIs03n1hxkC&pg=PA310|year=2009|publisher=Oxford University Press|isbn=978-0-19-534159-1|pages=310–312|url-status=live|archive-url=https://web.archive.org/web/20170109101113/https://books.google.com/books?id=kpIs03n1hxkC&pg=PA310|archive-date=9 January 2017}}</ref> The ] describes dyslexia as "difficulty with phonological processing (the manipulation of sounds), spelling, and/or rapid visual-verbal responding".<ref name="ninds1"/> | |||
;Perceptual visual-noise exclusion hypothesis | |||
The concept of a ] deficit (impaired filtering of behaviorally irrelevant visual information in dyslexia or visual-noise) is an emerging hypothesis, supported by research showing that subjects with dyslexia experience difficulty in performing visual tasks (such as motion detection in the presence of perceptual distractions) but do not show the same impairment when the distracting factors are removed in an experimental setting.<ref>{{Cite journal|author=Sperling AJ, Lu ZL, Manis FR, Seidenberg MS |title=Motion-perception deficits and reading impairment: it's the noise, not the motion |journal=Psychological Science |volume=17 |issue=12 |pages=1047–53 |year=2006 |month=December |pmid=17201786 |doi=10.1111/j.1467-9280.2006.01825.x }}</ref><ref>{{Cite journal|author=Roach NW, Hogben JH |title=Impaired filtering of behaviourally irrelevant visual information in dyslexia |journal=Brain |volume=130 |issue=3 |pages=771–85 |year=2007 |month=March |pmid=17237361 |doi=10.1093/brain/awl353 |url=http://brain.oxfordjournals.org/cgi/pmidlookup?view=long&pmid=17237361 }}</ref> The researchers have analogized their findings concerning visual discrimination tasks to findings in other research related to auditory discrimination tasks. They assert that dyslexic symptoms arise because of an impaired ability to filter out both visual and auditory distractions, and to categorize information so as to distinguish the important sensory data from the irrelevant.<ref name=Sperling2005>{{Cite journal|author=Sperling AJ, Lu ZL, Manis FR, Seidenberg MS |title=Deficits in perceptual noise exclusion in developmental dyslexia |journal=Nature Neuroscience |volume=8 |issue=7 |pages=862–3 |year=2005 |month=July |pmid=15924138 |doi=10.1038/nn1474 }}</ref> | |||
The British Dyslexia Association defines dyslexia as "a learning difficulty that primarily affects the skills involved in accurate and fluent word reading and spelling" and is characterized by "difficulties in phonological awareness, verbal memory and verbal processing speed".<ref name="PhillipsKelly2013">{{cite book|author1=Phillips, Sylvia|author2=Kelly, Kathleen|author3=Symes, Liz|title=Assessment of Learners with Dyslexic-Type Difficulties|url=https://books.google.com/books?id=7ZDCAQAAQBAJ&pg=PA7|year=2013|publisher=SAGE|isbn=978-1-4462-8704-0|page=7|url-status=live|archive-url=https://web.archive.org/web/20170109093024/https://books.google.com/books?id=7ZDCAQAAQBAJ&pg=PA7|archive-date=9 January 2017}}</ref> ''Phonological awareness'' enables one to identify, discriminate, remember (]), and mentally manipulate the sound structures of language—], onsite-rime segments, syllables, and words.<ref>{{cite journal |last1=Stahl |first1=Steven A. |last2=Murray |first2=Bruce A. |title=Defining phonological awareness and its relationship to early reading. |journal=Journal of Educational Psychology |volume=86 |issue=2 |pages=221–234 |doi=10.1037/0022-0663.86.2.221 |date=1994}}</ref><ref>{{cite journal |title=Phonological Awareness and Phonemic Perception in 4-Year-Old Children With Delayed Expressive Phonology Skills |journal=American Journal of Speech-Language Pathology |date=1 November 2003 |volume=12 |issue=4 |pages=463–471 |doi=10.1044/1058-0360(2003/092) |pmid=14658998 |last1=Rvachew |first1=Susan |last2=Ohberg |first2=Alyssa |last3=Grawburg |first3=Meghann |last4=Heyding |first4=Joan |s2cid=16983189 }}</ref> | |||
;Phonological deficit theory | |||
The ] theory proposes that people with dyslexia have a specific sound manipulation impairment, which affects their auditory memory, word recall, and sound association skills when processing speech. The phonological theory explains a reading impairment when using an ] writing system which requires learning the ]/] correspondence, the relationship between the graphic letter symbols and speech sounds which they represent.<ref name=theories/> | |||
===Assessment=== | |||
;Rapid auditory processing theory | |||
The following can be done to assess for dyslexia: | |||
The rapid auditory processing theory is an alternative to the phonological deficit theory, which specifies that the primary deficit lies in the perception of short or rapidly varying sounds. Support for this theory arises from evidence that people with dyslexia show poor performance on a number of auditory tasks, including frequency discrimination and temporal order judgment.<ref name=theories/> | |||
Apply a multidisciplinary team approach involving the child's parent(s) and teacher(s), school psychologist, pediatrician, and, as appropriate, ], and ].<ref>Catherine Christo, John M. Davis, and Stephen E. Brock, ''Identifying, Assessing, and Treating Dyslexia at School'' (New York: Springer Science+Business Media, 2009), 59.</ref> | |||
;Visual theory | |||
The visual theory represents a traditional perspective of dyslexia, as being the result of a visual impairment creating problems when processing information from letters and words from a written text. This includes visual processing problems such as ], poor ], and visual crowding. The Visual Theory does not deny the possibility of alternative causes of dyslexia<ref name=theories/> | |||
Gain familiarity with typical ages children reach various general developmental milestones, and domain-specific milestones, such as phonological awareness (recognizing rhyming words; identifying the initial sounds in words).<ref>Mather, Nancy and Barbara J. Wendling. ''Essentials of Dyslexia Assessment and Intervention''. Hoboken, NJ: John Wiley & Sons, 2012.</ref> | |||
===Effect of language orthography=== | |||
{{Main|Orthographies and dyslexia}} | |||
Do not rely on tests exclusively. Careful observation of the child in the school and home environments, and sensitive, comprehensive parental interviews are just as important as tests.<ref>Reid, Gavin and Jennie Guise. ''The Dyslexia Assessment''. London: Bloomsbury, 2017 ("... assessment for dyslexia includes more than tests; it involves comprehensive insights into the student's learning. This requires a full and comprehensive individual assessment as well as consideration of the environment and contextual factors.").</ref><ref>M. S. Thambirajah, ''Developmental Assessment of the School-Aged Child with Developmental Disabilities: A Clinician's Guide'' (London: Jessica Kingsley, 2011), 74.</ref> | |||
The complexity of a language's orthography or spelling system – formally, its ] – has a direct impact on how difficult it is to learn to read that language. English has a comparatively deep orthography within the ] ], with a complex orthographic structure that employs spelling patterns at several levels: principally, letter-sound correspondences, syllables, and morphemes. Other languages, such as ], have alphabetic orthographies that employ only letter-sound correspondences, so-called ]. It is relatively easy to learn to read languages like Spanish; it is much more difficult to learn to read languages with more complex orthographies, such as English.<ref>{{Cite book|last=Henry |first=Marcia K. |year=2005 |chapter=The history and structure of the English language|editor=Judith R. Birsh |title=Multisensory Teaching of Basic Language Skills |page=154 |publisher=Paul H. Brookes Publishing |location=Baltimore, Maryland |isbn=978-1-55766-678-5}} |oclc=234335596</ref> ]ic writing systems, notably ] and ]s, have a purer direct relationship between the sound of a word and the representative visual symbols, which pose a different type of dyslexic difficulty.<ref name="Chung KK"/><ref name=kana>{{Cite journal|author=Seki A, Kassai K, Uchiyama H, Koeda T |title=Reading ability and phonological awareness in Japanese children with dyslexia |journal=Brain Dev. |volume=30 |issue=3 |pages=179–88 |year=2008 |month=March |pmid=17720344 |doi=10.1016/j.braindev.2007.07.006 |url=}}</ref><ref name=lang>{{Cite journal|author=Siok WT, Niu Z, Jin Z, Perfetti CA, Tan LH |title=A structural-functional basis for dyslexia in the cortex of Chinese readers |journal=Proc. Natl. Acad. Sci. U.S.A. |volume=105 |issue=14 |pages=5561–6 |year=2008 |month=April |pmid=18391194 |pmc=2291101 |doi=10.1073/pnas.0801750105 |url=http://www.pnas.org/cgi/pmidlookup?view=long&pmid=18391194 |format=Free full text}}</ref><ref name='Wydell'/> | |||
Look at the empirically supported ] (RTI) approach,<ref>Jimerson, Shane R., Matthew K. Burns, and Amanda M. VanDerHeyden. ''Handbook of Response to Intervention: The Science and Practice of Multi-Tiered Systems of Support''. 2nd ed. New York: Springer Science+Business Media, 2016.</ref> which "... involves monitoring the progress of a group of children through a programme of intervention rather than undertaking a static assessment of their current skills. Children with the most need are those who fail to respond to effective teaching, and they are readily identified using this approach."<ref>{{cite journal | author = Snowling Margaret J | year = 2013| title = Early Identification and Interventions for Dyslexia: A Contemporary View | journal = Journal of Research in Special Educational Needs | volume = 13 | issue = 1| pages = 7–14 | doi = 10.1111/j.1471-3802.2012.01262.x | pmid = 26290655| pmc = 4538781}}</ref> | |||
From a neurological perspective, different types of writing system, for example alphabetic as compared to logographic writing systems, require different neurological pathways in order to read, write and spell. Because different writing systems require different parts of the brain to process the visual notation of speech, children with reading problems in one language might not have a reading problem in a language with a different orthography. The neurological skills required to perform the tasks of reading, writing, and spelling can vary between different writing systems and as a result different neurological deficits can cause dyslexic problems in relation to different orthographies.<ref name=kana/><ref name=lang/><ref name='Wydell'/> | |||
=== |
====Assessment tests==== | ||
There is a wide range of tests that are used in clinical and educational settings to evaluate the possibility of dyslexia.<ref name="testing">{{cite web|url=http://dyslexiahelp.umich.edu/dyslexics/learn-about-dyslexia/dyslexia-testing/tests|title=Tests for Dyslexia and Learning Disabilities|publisher=University of Michigan|access-date=15 March 2015|url-status=live|archive-url=https://web.archive.org/web/20150313000802/http://dyslexiahelp.umich.edu/dyslexics/learn-about-dyslexia/dyslexia-testing/tests|archive-date=13 March 2015}}</ref> If initial testing suggests that a person might have dyslexia, such tests are often followed up with a full diagnostic assessment to determine the extent and nature of the disorder.<ref name="PeerReid2013p">{{cite book|author1=Peer, Lindsay|author2=Reid, Gavin|title=Introduction to Dyslexia|url=https://books.google.com/books?id=OTiAAAAAQBAJ&pg=PT35|year=2013|publisher=Taylor & Francis|isbn=978-1-135-37290-3|pages=35–40|url-status=live|archive-url=https://web.archive.org/web/20170109134343/https://books.google.com/books?id=OTiAAAAAQBAJ&pg=PT35|archive-date=9 January 2017}}</ref> Some tests can be administered by a teacher or computer; others require specialized training and are given by psychologists.<ref name=balexia/> Some test results indicate how to carry out teaching strategies.<ref name="balexia">{{cite web|title=Screening and assessment|url=http://www.bdadyslexia.org.uk/educator/screening-and-assessment|website=British Dyslexia Association|access-date=11 March 2015|url-status=live|archive-url=https://web.archive.org/web/20150330101403/http://www.bdadyslexia.org.uk/educator/screening-and-assessment|archive-date=30 March 2015}}</ref><ref name=flet/> Because a variety of different cognitive, behavioral, emotional, and environmental factors all could contribute to difficulty learning to read, a comprehensive evaluation should consider these different possibilities. These tests and observations can include:<ref name="gerd">{{cite journal |last1=Schulte-Körne |first1=Gerd |title=The Prevention, Diagnosis, and Treatment of Dyslexia |journal=Deutsches Ärzteblatt International |date=October 2010 |volume=107 |issue=41 |pages=718–727 |doi=10.3238/arztebl.2010.0718 |pmid=21046003 |pmc=2967798 |issn=1866-0452}}</ref> | |||
Dyslexia is attributed to neurological factors that influence the individual's ability to read, write, and spell ].<ref name='Habib'/> | |||
* General measures of cognitive ability, such as the ], ], or ]. Low general cognitive ability would make reading more difficult. Cognitive ability measures also often try to measure different cognitive processes, such as verbal ability, nonverbal and spatial reasoning, working memory, and processing speed. There are different versions of these tests for different age groups. Almost all of these require additional training to give and score correctly, and are done by psychologists. According to Mather and Schneider (2015), a confirmatory profile and/or pattern of scores on cognitive tests confirming or ruling-out reading disorder has not yet been identified.<ref>Mather, N., & Schneider, D. The use of intelligence tests in the diagnosis of specific reading disability.{{cite book|url=https://books.google.com/books?id=ylzEBQAAQBAJ&q=Handbook+of+Intelligence:+Evolutionary+theory,+historical+perspective,+and+current+concepts|title=Handbook of Intelligence: Evolutionary Theory, Historical Perspective, and Current Concepts|last1=Goldstein|first1=Sam|last2=Princiotta|first2=Dana|last3=Naglieri|first3=Jack A.|date=2014|publisher=Springer|isbn=9781493915620|pages=415–434|language=en|access-date=10 January 2019}}</ref> | |||
* Screening or evaluation for mental health conditions: Parents and teachers can complete rating scales or behavior checklists to gather information about emotional and behavioral functioning for younger people. Many checklists have similar versions for parents, teachers, and younger people old enough to read reasonably well (often 11 years and older) to complete. Examples include the Behavioral Assessment System for Children, and the ]. All of these have nationally representative norms, making it possible to compare the level of symptoms to what would be typical for the younger person's age and biological sex. Other checklists link more specifically to psychiatric diagnoses, such as the ] or the ]. ] uses brief tools that are designed to catch cases with a disorder, but they often get false positive scores for people who do not have the disorder. Screeners should be followed up by a more accurate test or diagnostic interview as a result. Depressive disorders and anxiety disorders are two-three times higher in people with dyslexia, and attention-deficit/hyperactivity disorder is more common, as well.<ref>{{cite journal |last1=Collett |first1=Brent R. |last2=Ohan |first2=Jeneva L. |last3=Myers |first3=Kathleen M. |title=Ten-Year Review of Rating Scales. V: Scales Assessing Attention-Deficit/Hyperactivity Disorder |journal=Journal of the American Academy of Child & Adolescent Psychiatry |date=1 September 2003 |volume=42 |issue=9 |pages=1015–1037 |doi=10.1097/01.CHI.0000070245.24125.B6 |pmid=12960702 |url=https://jaacap.org/article/S0890-8567(09)60999-0/fulltext |access-date=3 October 2019 |language=en |issn=0890-8567}}</ref><ref>{{cite journal |last1=Stone |first1=Lisanne L |last2=Janssens |first2=Jan M A M |last3=Vermulst |first3=Ad A |last4=Van Der Maten |first4=Marloes |last5=Engels |first5=Rutger C M E |last6=Otten |first6=Roy |title=The Strengths and Difficulties Questionnaire: psychometric properties of the parent and teacher version in children aged 4–7 |journal=BMC Psychology |date=20 February 2015 |volume=3 |issue=1 |pages=4 |doi=10.1186/s40359-015-0061-8 |pmid=25815194 |pmc=4364334 |issn=2050-7283 |doi-access=free }}</ref><ref>{{cite journal |last1=Swart |first1=G. T. |title=The Clinician's Guide to the Behavior Assessment System For Children |journal=The Canadian Child and Adolescent Psychiatry Review |volume=14 |issue=3 |pages=90 |issn=1716-9119|pmc=2542918 |year=2005 }}</ref><ref>{{cite journal |last1=Birmaher |first1=B. |last2=Khetarpal |first2=S. |last3=Brent |first3=D. |last4=Cully |first4=M. |last5=Balach |first5=L. |last6=Kaufman |first6=J. |last7=Neer |first7=S. M. |title=The Screen for Child Anxiety Related Emotional Disorders (SCARED): scale construction and psychometric characteristics |journal=Journal of the American Academy of Child and Adolescent Psychiatry |volume=36 |issue=4 |pages=545–553 |doi=10.1097/00004583-199704000-00018 |pmid=9100430 |issn=0890-8567|year=1997 }}</ref> | |||
* Review of academic achievement and skills: Average spelling/reading ability for a dyslexic is a percentage ranking <16, well below normal. In addition to reviewing grades and teacher notes, standardized test results are helpful in evaluating progress. These include group administered tests, such as the ], that a teacher may give to a group or whole classroom of younger people at the same time. They also could include individually administered tests of achievement, such as the ], or the ] (which also includes a set of achievement tests). The individually administered tests again require more specialized training.<ref>{{cite book |last1=Lindquist |first1=E. F. |title=The Iowa tests of educational development: how to use the test results; a manual for teachers and counselors |date=1953 |publisher=Science Research Associates |url=https://books.google.com/books?id=yOc9AAAAYAAJ&q=Iowa+Tests+of+Educational+Development |access-date=3 October 2019 |language=en}}</ref><ref>{{cite journal |last1=Dell |first1=Cindy Ann |last2=Harrold |first2=Barbara |last3=Dell |first3=Thomas |title=Test Review: Wilkinson, G. S., & Robertson, G. J. (2006). Wide Range Achievement Test—Fourth Edition. Lutz, FL: Psychological Assessment Resources. WRAT4 Introductory Kit (includes manual, 25 test/response forms , and accompanying test materials): $243.00 |journal=Rehabilitation Counseling Bulletin |date=1 October 2008 |volume=52 |issue=1 |pages=57–60 |doi=10.1177/0034355208320076 |s2cid=145644409 |language=en |issn=0034-3552}}</ref><ref>{{cite book |last1=Semrud-Clikeman |first1=Margaret |last2=Ellison |first2=Phyllis Anne Teeter |title=Child Neuropsychology: Assessment and Interventions for Neurodevelopmental Disorders, 2nd Edition |date=2009 |publisher=Springer Science & Business Media |isbn=9780387889634 |page=119 |url=https://books.google.com/books?id=NBGSF9Jyg6AC&pg=PT119 |access-date=3 October 2019 |language=en}}</ref> | |||
==Screening== | |||
The following conditions may be contributory or overlapping factors, as they can lead to difficulty in reading: | |||
Screening procedures seek to identify children who show signs of possible dyslexia. In the preschool years, a family history of dyslexia, particularly in biological parents and siblings, predicts an eventual dyslexia diagnosis better than any test.<ref>Catherine Christo, John M. Davis, and Stephen E. Brock, ''Identifying, Assessing, and Treating Dyslexia at School'' (New York: Springer Science+Business Media, 2009), 56. {{ISBN|9780387885995}}</ref> In primary school (ages 5–7), the ideal screening procedure consists of training primary school teachers to carefully observe and record their pupils' progress through the phonics curriculum, and thereby identify children progressing slowly.<ref>Margaret J. Snowling, ''Dyslexia: A Very Short Introduction'' (Oxford, UK: Oxford University Press, 2019), 93–94.</ref><ref>, Ref: DFES-00281-2007 (00281-2007BKT-EN), Primary National Strategy, Department for Education and Skills (United Kingdom), 2007.</ref> When teachers identify such students they can supplement their observations with screening tests such as the ''Phonics screening check''<ref>{{cite web|url=https://www.gov.uk/government/publications/phonics-screening-check-2019-materials|title=Phonics screening check: 2019 materials|work=United Kingdom Department for Education, Standards and Testing Agency|access-date=14 October 2019}}</ref> used by United Kingdom schools during ]. | |||
* ] - neurologically based speech disorders, which can cause alexia (acquired dyslexia). | |||
* ] - <ref name='Huc-Chabrolle'/><ref name='Ramus2'>{{Cite journal|author=Ramus F, Pidgeon E, Frith U |title=The relationship between motor control and phonology in dyslexic children |journal=Journal of Child Psychology and Psychiatry, and Allied Disciplines |volume=44 |issue=5 |pages=712–22 |year=2003 |month=July |pmid=12831115 |doi=10.1111/1469-7610.00157 }}</ref><ref>{{Cite journal|author=Rochelle KS, Witton C, Talcott JB |title=Symptoms of hyperactivity and inattention can mediate deficits of postural stability in developmental dyslexia |journal=Experimental Brain Research |volume=192 |issue=4 |pages=627–33 |year=2009 |month=February |pmid=18830588 |doi=10.1007/s00221-008-1568-5 }}</ref> A disorder that occurs in between 12% and 24% of those with dyslexia.<ref name=Birsh2005 /> | |||
* ] - A condition that affects the ability to process auditory information. Auditory processing disorder is a listening disability.<ref name='Katz'>{{Cite journal | |||
|title= APD Evaluation to Therapy: The Buffalo Model | |||
|journal=AudiologyOnline | |||
|date=2007-05-14 | |||
|first=Jack | |||
|last=Katz | |||
|url=https://www.audiologyonline.com/articles/article_detail.asp?article_id=1803 | |||
|accessdate=2009-05-16 }}</ref>{{verify credibility|date=October 2010|The category is controversial, and it would be good to find other sources, particularly ], for this statement.}} It can lead to problems with ] and auditory ]. Many people with dyslexia have auditory processing problems including history of auditory reversals,{{fact|date=October 2010|reason=Better verification is needed for this statement.}} and may develop their own ] to compensate for this type of deficit. Auditory processing disorder is recognized as one of the major causes of dyslexia.<ref name='Katz'/><ref name=Ramus1>{{Cite journal|author=Ramus F |title=Developmental dyslexia: specific phonological deficit or general sensorimotor dysfunction? |journal=Current Opinion in Neurobiology |volume=13 |issue=2 |pages=212–8 |year=2003 |month=April |pmid=12744976 |doi=10.1016/S0959-4388(03)00035-7 }}</ref><ref>{{Cite news| first = Deborah | last = Moncrieff | |||
| title= Temporal Processing Deficits in Children with Dyslexia | date=2004-02-02 | |||
| publisher=speechpathology.com | url =http://www.speechpathology.com/articles/article_detail.asp?article_id=59 | work =speechpathology.com | accessdate = 2009-05-13 }}</ref><ref>{{Cite news|first=Deborah |last=Moncrieff | title=Auditory Processing Disorders and Dyslexic Children | date=2002-09-23 | publisher=audiologyonline.com | url =http://www.audiologyonline.com/articles/article_detail.asp?article_id=369 | work =audiologyonline.com | accessdate = 2009-05-13 }}</ref> Some children can acquire auditory processing disorder as a result of experiencing ] with effusion (glue ear, sticky ear, grommets) and other severe ear conditions.<ref name=MooreDR2007 >{{Cite journal|author=Moore DR |title=Auditory processing disorders: acquisition and treatment |journal=J Commun Disord |volume=40 |issue=4 |pages=295–304 |year=2007 |pmid=17467002 |doi=10.1016/j.jcomdis.2007.03.005 |url=}}</ref> | |||
* ] -<ref name='Huc-Chabrolle'/> A neurological condition characterized by a marked difficulty in carrying out routine tasks involving balance, fine-], ] coordination, difficulty in the use of speech sounds, problems with ] and organization are typical of dyspraxics. | |||
* ], also known as ] - A term used to describe sensitivity to certain wavelengths of light which interfere with ].<ref>{{Cite journal|author=Kruk R, Sumbler K, Willows D |title=Visual processing characteristics of children with Meares-Irlen syndrome |journal=Ophthalmic & Physiological Optics |volume=28 |issue=1 |pages=35–46 |year=2008 |month=January |pmid=18201334 |doi=10.1111/j.1475-1313.2007.00532.x |url=http://www3.interscience.wiley.com/journal/119401635/abstract }}</ref><ref>{{Cite journal|author=Evans BJ, Busby A, Jeanes R, Wilkins AJ |title=Optometric correlates of Meares-Irlen syndrome: a matched group study |journal=Ophthalmic & Physiological Optics |volume=15 |issue=5 |pages=481–7 |year=1995 |month=September |pmid=8524579 |doi=10.1016/0275-5408(95)00063-J }}</ref>{{verify credibility|date=October 2010|The same obscure journal twice should be backed up by a more mainstream source for this medical claim.}} | |||
* ] (SLI) - A developmental language disorder that can affect both expressive and receptive language. SLI is defined as a "pure" language impairment, meaning that is not related to or caused by other developmental disorders, hearing loss or acquired brain injury. A study by the Universities of ] and ] examined ] and ] in 3-year-old Dutch children at ] risk of developing dyslexia. Their performance in speech sound categorization and their production of words was compared to that of age-matched children with SLI and typically developing controls. The results of the at-risk and SLI-group were highly similar. Analysis of the individual data revealed that both groups contained subgroups with good and poorly performing children. Their impaired expressive phonology seemed to be related to a deficit in ]. The findings indicate that both dyslexia and SLI can be explained by a multi-risk model which includes ] as well as ] factors.<ref name='Huc-Chabrolle'/><ref name='Gerritsa'>{{Cite journal|author=Pennington BF, Lefly DL |title=Early reading development in children at family risk for dyslexia |journal=Child Development |volume=72 |issue=3 |pages=816–33 |year=2001 |pmid=11405584 |doi=10.1111/1467-8624.00317 |month=May }}</ref>{{primary source claim}} | |||
In the medical setting, child and adolescent psychiatrist M. S. Thambirajah emphasizes that "iven the high prevalence of developmental disorders in school-aged children, all children seen in clinics should be systematically screened for developmental disorders irrespective of the presenting problem/s." Thambirajah recommends screening for developmental disorders, including dyslexia, by conducting a brief developmental history, a preliminary psychosocial developmental examination, and obtaining a school report regarding academic and social functioning.<ref>{{cite book|title=Developmental assessment of the school-aged child with developmental disabilities : a clinician's guide|last=Thambirajah, M. S.|date=2011|publisher=Jessica Kingsley Publishers|isbn=9780857003256|location=London|oclc=747410566}}</ref> | |||
Experience of speech acquisition delays and speech and language problems can be due to problems processing and decoding auditory input prior to reproducing their own version of speech,<ref>{{Cite journal|author=Schuele CM |title=The impact of developmental speech and language impairments on the acquisition of literacy skills |journal=Ment Retard Dev Disabil Res Rev |volume=10 |issue=3 |pages=176–83 |year=2004 |pmid=15611989 |doi=10.1002/mrdd.20014 }}</ref><ref>{{Cite journal|author=Peterson RL, McGrath LM, Smith SD, Pennington BF |title=Neuropsychology and genetics of speech, language, and literacy disorders |journal=Pediatr. Clin. North Am. |volume=54 |issue=3 |pages=543–61, vii |year=2007 |month=June |pmid=17543909 |doi=10.1016/j.pcl.2007.02.009 |url=http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6X3J-4NW0PFC-C&_user=10&_coverDate=06%2F30%2F2007&_rdoc=1&_fmt=high&_orig=search&_sort=d&_docanchor=&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=05064ef5d70eb47be996a37e63953f0c}}</ref> and may be observed as ], ] or hesitant speech.<ref name='University'/> | |||
==Management== | ==Management== | ||
{{Main|Management of dyslexia}} | {{Main|Management of dyslexia}} | ||
Through the use of compensation strategies, therapy and educational support, individuals with dyslexia can learn to read and write.<ref>{{cite journal|last1=Bogon|first1=Johana|title=TVA based assessment of visual attention functions in developmental dyslexia|journal=Frontiers in Psychology|date=October 2014|pmc=4199262|pmid=25360129|doi=10.3389/fpsyg.2014.01172|volume=5|pages=1172|doi-access=free}}</ref> There are techniques and technical aids that help to manage or conceal symptoms of the disorder.<ref name="Brunswick2012">{{cite book|author=Brunswick, Nicola|title=Supporting Dyslexic Adults in Higher Education and the Workplace|url=https://books.google.com/books?id=suc1o0hueowC&pg=PA115|access-date=10 April 2012|date=10 April 2012|publisher=John Wiley & Sons|isbn=978-0-470-97479-7|pages=115–|url-status=live|archive-url=https://web.archive.org/web/20131231081312/http://books.google.com/books?id=suc1o0hueowC&pg=PA115|archive-date=31 December 2013}}</ref> Reducing stress and anxiety can sometimes improve written comprehension.<ref name=pmid21046003>{{cite journal|last1=Schulte-Körne|first1=G|title=The prevention, diagnosis, and treatment of dyslexia|journal=Deutsches Ärzteblatt International|date=October 2010|pages=718–26|pmc=2967798|pmid=21046003|doi=10.3238/arztebl.2010.0718|volume=107|issue=41}}</ref> For ] with alphabet-writing systems, the fundamental aim is to increase a child's awareness of correspondences between ]s (letters) and ]s (sounds), and to relate these to reading and spelling by teaching how sounds blend into words. Reinforced collateral training focused on reading and spelling may yield longer-lasting gains than oral phonological training alone.<ref name=Lyytinen>{{cite book |author=Lyytinen, Heikki; Erskine, Jane; Aro, Mikko and Richardson, Ulla |url=https://books.google.com/books?id=PCy6c9hIL5YC&pg=PA454 |contribution=Reading and reading disorders |editor-last=Hoff |editor-first=Erika |title=Blackwell Handbook of Language Development |pages=454–474 |publisher=Blackwell |year=2009 |isbn=978-1-4051-9459-4 |url-status=live |archive-url=https://web.archive.org/web/20170109204820/https://books.google.com/books?id=PCy6c9hIL5YC&pg=PA454 |archive-date=9 January 2017 }}</ref> Early intervention can be successful in reducing reading failure.<ref>{{cite journal|last1=van der Leij|first1=Aryan|title=Dyslexia and early intervention: what did we learn from the Dutch Dyslexia Programme?|journal=Dyslexia|date=1 November 2013|volume=19|issue=4|pages=241–255|doi=10.1002/dys.1466|pmid=24133037|issn=1099-0909}}</ref> | |||
There is no cure for dyslexia, but dyslexic individuals can learn to read and write with appropriate educational support. | |||
Research does not suggest that specially-tailored fonts (such as ] and ]) help with reading.<ref name="Kuster">{{cite journal|last1=Kuster|first1=Sanne M.|last2=van Weerdenburg|first2=Marjolijn|last3=Gompel|first3=Marjolein|last4=Bosman|first4=Anna M. T.|date=April 2018|title=Dyslexie font does not benefit reading in children with or without dyslexia|journal=Annals of Dyslexia|language=en|volume=68|issue=1|pages=25–42|doi=10.1007/s11881-017-0154-6|issn=0736-9387|pmc=5934461|pmid=29204931}}</ref> Children with dyslexia read text set in a regular font such as ] and ] just as quickly, and they show a preference for regular fonts over specially-tailored fonts.<ref name="Kuster"/> Some research has pointed to increased ] being beneficial.<ref name="Kuster"/> | |||
Especially for undergraduates, some consideration of what 'reading' is and what it is for can be useful. There are techniques (reading the first sentence of each paragraph in a chapter, for example) which can give an overview of content. This can be sufficient for some purposes. Since stress and anxiety are contributors to a dyslexic's weaknesses in absorbing information, removing these can assist in improving understanding. When a dyslexic knows that not every reading experience must be onerous, it greatly helps their mental approach to the task. | |||
There is currently no evidence showing that music education significantly improves the reading skills of adolescents with dyslexia.<ref>{{cite journal|title=Music education for improving reading skills in children and adolescents with dyslexia|journal=Cochrane Database of Systematic Reviews|issue=8|last1=Cogo-Moreira|first1=Hugo|last2=Andriolo|first2=Régis B|last3=Yazigi|first3=Latife|last4=Ploubidis|first4=George B|last5=Brandão de Ávila|first5=Clara Regina|last6=Mari|first6=Jair J|date=15 August 2012|pages=CD009133|doi=10.1002/14651858.cd009133.pub2|pmid=22895983|url=https://researchonline.lshtm.ac.uk/246986/1/CD009133.pdf |archive-url=https://web.archive.org/web/20170830053651/http://researchonline.lshtm.ac.uk/246986/1/CD009133.pdf |archive-date=2017-08-30 |url-status=live}}</ref> | |||
The best approaches acknowledge that the objective in helping to improve a dyslexic's 'reading' is not to 'read-like-a-non-dyslexic-does', but to find a way of extracting information from text that works efficiently for someone who processes such information differently from the majority. | |||
==Prognosis== | |||
For ] the fundamental aim is to increase a child's awareness of correspondences between ]s and ]s, and to relate these to reading and spelling. It has been found that training focused towards visual language and ] issues yields longer-lasting gains than mere oral phonological training.<ref name=Lyytinen/> | |||
Dyslexic children require special instruction for word analysis and spelling from an early age.<ref>{{cite journal|last1=O'Hare|first1=Anne|title=Dyslexia: what do paediatricians need to know?|journal= Paediatrics and Child Health|date=2010|pages=338–343|doi=10.1016/j.paed.2010.04.004|volume=20|issue=7}}</ref> The prognosis, generally speaking, is positive for individuals who are identified in childhood and receive support from friends and family.<ref name=ninds1/> The New York educational system (NYED) indicates "a daily uninterrupted 90-minute block of instruction in reading" and "instruction in phonemic awareness, phonics, vocabulary development, reading fluency" so as to improve the individual's reading ability.<ref>{{cite web |title=Response to Intervention Guidance – Minimum Requirements of a Response to Intervention Program (RtI) – Instruction Matched to Student Need: Special Education : P12 : NYSED |url=http://www.p12.nysed.gov/specialed/RTI/guidance/instruction.htm |website=p12.nysed.gov |access-date=10 January 2019 |archive-date=8 August 2018 |archive-url=https://web.archive.org/web/20180808183234/http://www.p12.nysed.gov/specialed/RTI/guidance/instruction.htm |url-status=dead }}</ref> | |||
==Epidemiology== | |||
The best form of approach is determined by the underlying ] cause(s) of the dyslexic symptoms. | |||
The prevalence of dyslexia is unknown, but it has been estimated to be as low as 5% and as high as 17% of the population.<ref>{{cite book|title = Psychiatry, 2 Volume Set|url = https://books.google.com/books?id=6Rp0BgAAQBAJ|publisher = John Wiley & Sons|date = 29 January 2015|isbn = 9781118845493|first1 = Allan|last1 = Tasman|first2 = Jerald|last2 = Kay|first3 = Jeffrey A.|last3 = Lieberman|first4 = Michael B.|last4 = First|first5 = Michelle|last5 = Riba|url-status=live|archive-url = https://web.archive.org/web/20150906081853/https://books.google.com/books?id=6Rp0BgAAQBAJ|archive-date = 6 September 2015|df = dmy-all}}</ref> Dyslexia is diagnosed more often in males.<ref name=Lancet2012/> | |||
There are different definitions of dyslexia used throughout the world. Further, differences in writing systems may affect development of written language ability due to the interplay between auditory and written representations of phonemes.<ref>{{cite journal|last1=Protopapas|first1=Athanassios|title=From temporal processing to developmental language disorders: mind the gap|journal=Philosophical Transactions of the Royal Society B: Biological Sciences|date=2013|pmid=24324245|doi=10.1098/rstb.2013.0090|pmc=3866431|volume=369|issue=1634|pages=20130090}}</ref> Dyslexia is not limited to difficulty in converting letters to sounds, and Chinese people with dyslexia may have difficulty converting ]s into their meanings.<ref>{{cite journal|last1=Zhao|first1=Jing|title=The visual magnocellular-dorsal dysfunction in Chinese children with developmental dyslexia impedes Chinese character recognition.|journal=Scientific Reports|date=November 2014|pmc=4238300|pmid=25412386|doi=10.1038/srep07068|volume=4|pages=7068|bibcode = 2014NatSR...4E7068Z }}</ref><ref name="Marshall2012l">{{cite book|author=Marshall, Chloe|title=Current Issues in Developmental Disorders|url=https://books.google.com/books?id=5VK_TWsQ3N4C&pg=PA152|year=2012|publisher=Psychology Press|isbn=978-1-84872-084-8|page=152|url-status=live|archive-url=https://web.archive.org/web/20170109144200/https://books.google.com/books?id=5VK_TWsQ3N4C&pg=PA152|archive-date=9 January 2017}}</ref> The Chinese vocabulary uses logographic, monographic, non-alphabet writing where one character can represent an individual phoneme.<ref>{{cite book|title = Brain, Mind, and Developmental Psychopathology in Childhood|url = https://books.google.com/books?id=5ujeVaMa9U0C&pg=PA177|publisher = Jason Aronson|date = 16 January 2012|isbn = 9780765708663|first1 = Elena|last1 = Garralda|first2 = Jean-Philippe|last2 = Raynaud}}</ref> | |||
Context sensitive ] combined with ] systems offer forms of ] to dyslexia users, supporting reading and writing. | |||
The phonological-processing hypothesis attempts to explain why dyslexia occurs in a wide variety of languages. Furthermore, the relationship between phonological capacity and reading appears to be influenced by orthography.<ref>{{cite journal|title = Phonological processing deficits as a universal model for dyslexia: evidence from different orthographies|journal = CoDAS|pages = 509–519|volume = 26|issue = 6|doi = 10.1590/2317-1782/20142014135|pmid = 25590915|first1 = Ana Luiza Gomes Pinto|last1 = Navas|first2 = Érica de Cássia|last2 = Ferraz|first3 = Juliana Postigo Amorina|last3 = Borges|first4 = Ana Luiza Gomes Pinto|last4 = Navas|first5 = Érica de Cássia|last5 = Ferraz|first6 = Juliana Postigo Amorina|last6 = Borges|year = 2014|df = dmy-all|doi-access = free}}</ref> | |||
==History== | |||
{{Main|History of developmental dyslexia}} | |||
==History== | |||
*Identified by ] in 1881,<ref>{{Cite journal|author=Berkhan O |journal=Neur. Zent |volume=28 |year=1917}}</ref> the term 'dyslexia' was later coined in 1887 by Rudolf Berlin,<ref>{{Cite journal | |||
{{Main|History of dyslexia research}} | |||
| title=Rudolf Berlin: Originator of the term dyslexia | |||
Dyslexia was clinically described by ] in 1881,<ref name="Oswald Berkhan ref 1">{{cite journal |author=Berkhan O |year=1917 |title=Über die Wortblindheit, ein Stammeln im Sprechen und Schreiben, ein Fehl im Lesen |trans-title=About word blindness, adyslalia of speech and writing, a weakness in reading |language=de |journal=Neurologisches Centralblatt |volume=36 |pages=914–27 |url=https://books.google.com/books?id=DmEsAQAAIAAJ&q=Wortblindheit}}</ref> but the term ''dyslexia'' was coined in 1883 by ], an ] in ].<ref name="Berlin">Berlin, Rudolf. ''Medicinisches Correspondenzblatt des Württembergischen Ärztlichen Landesvereins'' 53 (1883): 209.</ref><ref name="Websters">Webster's Third New International Dictionary. "History and Etymology for dyslexia", s.v. "]". Springfield, MA: Merriam-Webster, 1961, rev. 2016.</ref><ref>{{cite journal |title=Über Dyslexie |trans-title=About dyslexia |year=1884 |journal=Archiv für Psychiatrie |volume=15 |pages=276–278}}</ref> He used the term to refer to the case of a young boy who had severe difficulty learning to read and write, despite showing typical intelligence and physical abilities in all other respects.<ref>{{cite book|title=Annual of the Universal Medical Sciences and Analytical Index: A Yearly Report of the Progress of the General Sanitary Sciences Throughout the World|url=https://books.google.com/books?id=5_IhAQAAMAAJ&pg=PA39|year=1888|publisher=F. A. Davis Company|page=39|url-status=live|archive-url=https://web.archive.org/web/20170109200623/https://books.google.com/books?id=5_IhAQAAMAAJ&pg=PA39|archive-date=9 January 2017}}</ref> In 1896, W. Pringle Morgan, a British physician from ], published a description of a reading-specific learning disorder in a report to the '']'' titled "Congenital Word Blindness".<ref>{{cite book|last1=Brooks|first1=Patricia|title=Encyclopedia of language development|date=2014|publisher=SAGE|page=30|url=https://books.google.com/books?id=mvfSAwAAQBAJ&pg=PR30|isbn=9781483346434}}</ref> The distinction between phonological versus surface types of dyslexia is only descriptive, and without any etiological assumption as to the underlying brain mechanisms. However, studies have alluded to potential differences due to variation in performance.<ref>{{cite journal|last1=Mishra|first1=Srikanta K.|title=Medial efferent mechanisms in children with auditory processing disorders.|journal=Frontiers in Human Neuroscience|date=October 2014|pmid=25386132|doi=10.3389/fnhum.2014.00860|pmc=4209830|volume=8|pages=860|doi-access=free}}</ref> Over time, the consensus has changed from an intelligence-based model to an age-based model for dyslexia . <ref>{{cite journal |last1=Al-Shidhani |first1=Thuraya Ahmed |last2=Arora |first2=Vinita |title=Understanding Dyslexia in Children through Human Development Theories |journal=Sultan Qaboos University Medical Journal |date=2012 |volume=12 |issue=3 |pages=286–294 |doi=10.12816/0003141 |pmid=23269949 |pmc=3529662 |issn=2075-051X}}</ref><ref name="flet">{{cite journal |last1=FLETCHER |first1=JACK M. |title=Dyslexia: The evolution of a scientific concept |journal=Journal of the International Neuropsychological Society |date=2009 |volume=15 |issue=4 |pages=501–508 |doi=10.1017/S1355617709090900 |pmid=19573267 |pmc=3079378 |issn=1355-6177}}</ref> | |||
| journal=Annals of Dyslexia|date=January, 1973 | |||
| first=Rudolph | |||
| last=Wagner | |||
| volume=23|issue= 1 | |||
| pages=57–63 | |||
| doi= 10.1007/BF02653841 | |||
| accessdate=2009-05-12 }}</ref> an ] practising in ], Germany.<ref>{{Cite journal | |||
| title = Uber Dyslexie | |||
| journal = Archiv fur Psychiatrie | |||
| volume = 15 | |||
| pages = 276–278}}</ref> | |||
*In 1896, W. Pringle Morgan published a description of a reading-specific learning disorder in the ] titled "Congenital Word Blindness".<ref name=Snowling1>{{Cite journal|author=Snowling MJ |title=Dyslexia: a hundred years on |journal=BMJ |volume=313 |issue=7065 |pages=1096–7 |year=1996 |month=November |pmid=8916687 |pmc=2352421 |url=http://bmj.com/cgi/pmidlookup?view=long&pmid=8916687 }}</ref> | |||
*During the 1890s and early 1900s, James Hinshelwood published a series of articles in medical journals describing similar cases of congenital word blindness. In his 1917 book ''Congenital Word Blindness'', Hinshelwood asserted that the primary disability was in visual memory for words and letters, and described symptoms including letter reversals, and difficulties with spelling and reading comprehension.<ref name=Hinshelwood1917>{{Cite book | |||
| first=James |last=Hinshelwood | |||
| year = 1917 | |||
| title = Congenital Word-blindness | |||
| publisher = H.K. Lewis | |||
| location = London | |||
| oclc = 9713889 | |||
| url = http://www.archive.org/details/congenitalwordbl00hinsrich}}{{Page needed|date=September 2010}}</ref> | |||
*'''1925''' ] determined that there was a syndrome unrelated to brain damage that made learning to read difficult. Orton's theory ] described individuals with dyslexia having difficulty associating the visual forms of words with their spoken forms.<ref name='Orton1'> | |||
{{Cite journal | |||
| title=Word-blindness in school children. | |||
| journal=Archives of Neurology and Psychiatry |year=1925 | |||
| first=Samuel | |||
| last=Orton | |||
| volume=14 | |||
| issue=5 | |||
| pages=285–516 | |||
| doi=10.1001/archneurpsyc.1925.02200170002001 | |||
| doi_brokendate=2009-08-07 }}</ref> Orton observed that reading deficits in dyslexia did not seem to stem from strictly visual deficits.<ref>{{Cite journal | |||
| first = Marcia K. | |||
| last = Henry | |||
| title = Structured, sequential, multisensory teaching: The Orton legacy | |||
| journal = Annals of Dyslexia | |||
| year = 1998 | |||
| month = December | |||
| doi = 10.1007/s11881-998-0002-9 | |||
| volume = 48 | |||
| issue = 1 | |||
| pages = 1–26}}</ref> He believed the condition was caused by the failure to establish ] in the brain.<ref name=Orton1928>{{Cite journal | |||
| first = Samuel T. | |||
| last = Orton | |||
| date = 1928-04-07 | |||
| title = Specific Reading Disability — Strephosymbolia | |||
| journal = Journal of the American Medical Association | |||
| volume = 90 | |||
| issue = 14 | |||
| pages = 1095–9}} <br/>reprinted: {{Cite journal|first=Samuel T. |last=Orton |month=December |year=1963 |title= Specific reading disability — Strephosymbolia |journal=Annals of Dyslexia |volume=13 |issue=1 |pages=9–17 |doi=10.1007/BF02653604}}</ref> Orton later worked with the psychologist and educator ] to develop an educational intervention that pioneered the use of simultaneous multisensory instruction.<ref>{{Cite journal | |||
| first = Jennifer | |||
| last = Goeke | |||
| title = Orton-Gillingham and Orton-Gillingham-based reading instruction: a review of the literature | |||
| journal = Journal of Special Education | |||
| year = 2006 | |||
| doi = 10.1177/00224669060400030501 | |||
| volume = 40 | |||
| issue = 3 | |||
| pages = 171–183 | |||
| last2 = Goeke | |||
| first2 = J. L. | |||
}}</ref> | |||
*In contrast, Dearborn, Gates, Bennet and Blau considered a faulty guidance of the seeing mechanism to be the cause. They sought to discover if a conflict between spontaneous orientation of the scanning action of the eyes from right to left and training aimed at the acquisition of an opposite direction would allow an interpretation of the facts observed in the dyslexic disorder and especially of the ability to mirror-read. | |||
*'''1949''' Research conducted under G. Mahec show that the phenomenon is clearly linked to the dynamics of sight as it disappears when the space between letters is increased, transforming the reading into spelling. This experience also explains the ability to mirror-read. | |||
*'''1968''' Makita suggested that dyslexia was mostly absent among Japanese children.<ref>Makita K. (1968). "The rarity of reading disability in Japanese children." ''American Journal of Orthopsychiatry'' 38:599–614.</ref> A 2005 study shows that Makita's claim of rarity of incidence of reading disabilities in Japan to be incorrect.<ref>{{Cite web|url=http://www3.interscience.wiley.com/journal/119461051/abstract |title=Reading disabilities in modern Japanese children. Takehiko Hirose. 2005; Journal of Research in Reading – Wiley InterScience |work= |accessdate=}}</ref> | |||
*In the 1970s a new hypothesis emerged: that dyslexia stems from a deficit in ] processing or difficulty in recognizing that spoken words are formed by discrete ]s. Affected individuals have difficulty associating these sounds with the visual letters that make up written words. Key studies suggested the importance of ],<ref>{{Cite journal| first = L | last = Bradley | year = 1983 | |||
| title = Categorizing sounds and learning to read—a causal connection| journal = Nature | |||
| volume = 30| issue = 2 | pages = 419–421 | doi = 10.1038/301419a0 | last2 = Bryant | first2 = P. E. }}</ref> | |||
*'''1979''' Galaburda and Kemper,<ref name='GalaburdaKempe'>{{Cite journal|author=Galaburda AM, Kemper TL |title=Cytoarchitectonic abnormalities in developmental dyslexia: a case study |journal=Annals of Neurology |volume=6 |issue=2 |pages=94–100 |year=1979 |month=August |pmid=496415 |doi=10.1002/ana.410060203 |url=http://www.scholaruniverse.com/ncbi-linkout?id=496415 |format=Free full text}}</ref> and Galaburda et al. 1985,<ref>{{Cite journal|author=Galaburda AM, Sherman GF, Rosen GD, Aboitiz F, Geschwind N |title=Developmental dyslexia: four consecutive patients with cortical anomalies |journal=Annals of Neurology |volume=18 |issue=2 |pages=222–33 |year=1985 |month=August |pmid=4037763 |doi=10.1002/ana.410180210 }}</ref> reported observations from the examination of post autopsy brains of people with dyslexia. Their studies reporting observed anatomical differences in the ] in a dyslexic brain, taken with the similar work of Cohen et al. 1989,<ref>{{Cite journal|author=Cohen M, Campbell R, Yaghmai F |title=Neuropathological abnormalities in developmental dysphasia |journal=Annals of Neurology |volume=25 |issue=6 |pages=567–70 |year=1989 |month=June |pmid=2472772 |doi=10.1002/ana.410250607 |url=http://www.nlm.nih.gov/medlineplus/aphasia.html |format=Free full text}}</ref> suggested abnormal ] development, which was presumed to occur before or during the sixth month of foetal brain development.<ref name='Habib'/> | |||
*'''1993''' Castles and Coltheart describe developmental dyslexia as two prevalent and distinct varieties using the subtypes of ], Surface and Phonological Dyslexia.<ref name='Castles Coltheart'/> Manis et al. 1996, concluded that there were probably more than two subtypes of dyslexia, which would be related to multiple underlying deficits.<ref name='Manis'>{{Cite journal|author=Manis FR, Seidenberg MS, Doi LM, McBride-Chang C, Petersen A |title=On the bases of two subtypes of developmental dyslexia |journal=Cognition |volume=58 |issue=2 |pages=157–95 |year=1996 |month=February |pmid=8820386 |doi=10.1016/0010-0277(95)00679-6 }}</ref> | |||
*'''1994''' From post autopsy specimens Galaburda et al., reported : Abnormal auditory processing in people with dyslexia suggests that accompanying ] abnormalities might be present in the auditory system. Supported the reported behavioral findings of a left hemisphere-based phonological defect in dyslexic individuals.<ref name=Galaburda1994>{{Cite journal|author=Galaburda AM, Menard MT, Rosen GD |title=Evidence for aberrant auditory anatomy in developmental dyslexia |journal=Proc. Natl. Acad. Sci. U.S.A. |volume=91 |issue=17 |pages=8010–3 |year=1994 |month=August |pmid=8058748 |pmc=44534 |doi=10.1073/pnas.91.17.8010 }}</ref> | |||
*The development of ] technologies during the 1980s and 1990s enabled dyslexia research to make significant advances. ] (]) and ] (]) studies have revealed the neural signature of adult normal reading (e.g. Fiez and Petersen, 1998;<ref>{{Cite journal|author=Fiez JA, Petersen SE |title=Neuroimaging studies of word reading |journal=Proc. Natl. Acad. Sci. U.S.A. |volume=95 |issue=3 |pages=914–21 |year=1998 |month=February |pmid=9448259 |pmc=33816 |doi=10.1073/pnas.95.3.914 |url=http://www.pnas.org/cgi/pmidlookup?view=long&pmid=9448259 }}</ref> Turkeltaub et al., 2002<ref name='Turkeltaub'>{{Cite journal|author=Turkeltaub PE, Eden GF, Jones KM, Zeffiro TA |title=Meta-analysis of the functional neuroanatomy of single-word reading: method and validation |journal=NeuroImage |volume=16 |issue=3 Pt 1 |pages=765–80 |year=2002 |month=July |pmid=12169260 |doi=10.1006/nimg.2002.1131 }}</ref> and phonological processing (e.g., Gelfand and Bookheimer, 2003;<ref>{{Cite journal|author=Gelfand JR, Bookheimer SY |title=Dissociating neural mechanisms of temporal sequencing and processing phonemes |journal=Neuron |volume=38 |issue=5 |pages=831–42 |year=2003 |month=June |pmid=12797966 |doi=10.1016/S0896-6273(03)00285-X }}</ref> Poldrack et al., 1999).<ref>{{Cite journal|author=Poldrack RA, Wagner AD, Prull MW, Desmond JE, Glover GH, Gabrieli JD |title=Functional specialization for semantic and phonological processing in the left inferior prefrontal cortex |journal=NeuroImage |volume=10 |issue=1 |pages=15–35 |year=1999 |month=July |pmid=10385578 |doi=10.1006/nimg.1999.0441 }}</ref> Employing various experimental approaches and ] (e.g., the detection or judgment of rhymes, nonword reading, and implicit reading), these studies have localized dysfunctional phonological processing in dyslexia to left-hemisphere perisylvian regions, especially for the ] (Paulesu et al., 2001; for review, see Eden and Zeffiro, 1998,<ref name=Paulesu>{{Cite journal|author=Eden GF, Zeffiro TA |title=Neural systems affected in developmental dyslexia revealed by functional neuroimaging |journal=Neuron |volume=21 |issue=2 |pages=279–82 |year=1998 |month=August |pmid=9728909 |doi=10.1016/S0896-6273(00)80537-1 }}</ref>). However, it has been demonstrated that in ], where reading places less demands on ] processing and the integration of visual-] information is crucial, dyslexia is associated with under activity of the left ] (Siok et al., 2004).<ref name=ClinicalTrial>{{Cite journal|author=Eden GF, Jones KM, Cappell K |title=Neural changes following remediation in adult developmental dyslexia |journal=Neuron |volume=44 |issue=3 |pages=411–22 |year=2004 |month=October |pmid=15504323 |doi=10.1016/j.neuron.2004.10.019 }}</ref> | |||
*'''1999''' Wydell and ] reported the case study of an English-Japanese ] with ] dyslexia.<ref name='Wydell'>{{Cite journal|author=Wydell TN, Butterworth B |title=A case study of an English-Japanese bilingual with monolingual dyslexia |journal=Cognition |volume=70 |issue=3 |pages=273–305 |year=1999 |month=April |pmid=10384738 |doi=10.1016/S0010-0277(99)00016-5 }}</ref> Suggesting that any language where ]-to-] mapping is transparent, or even ], or any language whose orthographic unit representing sound is coarse (i.e. at a whole character or word level) should not produce a high incidence of developmental phonological dyslexia, and that orthography can influence dyslexic symptoms. | |||
*'''2003''' Ziegler and colleagues claimed that the dyslexia suffered by German or Italian dyslexics is very similar to the one suffered by English dyslexics (readers of different—shallow versus deep orthographic systems), supporting the idea that the origin of dyslexia is mostly biological.<ref>{{Cite journal|author=Ziegler JC, Perry C, Ma-Wyatt A, Ladner D, Schulte-Körne G |title=Developmental dyslexia in different languages: language-specific or universal? |journal=J Exp Child Psychol |volume=86 |issue=3 |pages=169–93 |year=2003 |month=November |pmid=14559203 |doi=10.1016/S0022-0965(03)00139-5 |url=http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6WJ9-49S3C95-1&_user=10&_coverDate=11%2F30%2F2003&_rdoc=1&_fmt=high&_orig=search&_sort=d&_docanchor=&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=624d7f18f166694ceea379eda46e8755}}</ref> | |||
*'''2007''' Lyytinen et al. Researchers are seeking a link between the neurological and genetic findings, and the reading disorder.<ref name=Lyytinen>{{Cite book | |||
| author = Lyytinen, Heikki, Erskine, Jane, Aro, Mikko, Richardson, Ulla | |||
| contribution = Reading and reading disorders | |||
| editor-last = Hoff | |||
| editor-first = Erika | |||
| title = Blackwell Handbook of Language Development | |||
| pages = 454–474 | |||
| publisher = Blackwell | |||
| place = | |||
| year = 2007 | |||
| isbn = 978-1-4051-3253-4}}</ref> | |||
*'''2008''' S Heim et al. in a paper titled "Cognitive subtypes of dyslexia" describe how they compared different sub-groups of dyslexics in comparison with a control group. This is one of the first studies not to just compare dyslexics with a non dyslexic control, but to go further and compared the different cognitive sub groups with a non dyslexic control group.<ref name=Heim/> | |||
*'''2008''' Wai Ting Siok et al. in a paper titled "A structural–functional basis for dyslexia in the cortex of Chinese readers" describe how dyslexia is language dependent, and especially between alphabetic and non-alphabetic writing systems.<ref name=lang/> | |||
*'''2010''' KK Chung et al. investigated the "Cognitive profiles of Hong Kong Chinese adolescents with dyslexia".<ref name="Chung KK"/> | |||
==Society and culture== | ==Society and culture== | ||
{{See also|List of artistic depictions of dyslexia}} | |||
===Education law === | |||
As is the case with any disorder, society often makes an assessment based on incomplete information. Before the 1980s, dyslexia was thought to be a consequence of education, rather than a neurological disability. As a result, society often misjudges those with the disorder.<ref name=pmid21046003/> There is also sometimes a workplace stigma and negative attitude towards those with dyslexia.<ref>{{cite journal|last1=de Berr|first1=J|title=Factors influencing work participation of adults with developmental dyslexia|journal=BMC Public Health|date=2014|pmc=3913008|pmid=24460949|doi=10.1186/1471-2458-14-77|volume=14|pages=77|doi-access=free}}</ref> If the instructors of a person with dyslexia lack the necessary training to support a child with the condition, there is often a negative effect on the student's learning participation.<ref>{{cite journal|title = The Inclusion of Students with Dyslexia in Higher Education: A Systematic Review Using Narrative Synthesis|journal = Dyslexia (Chichester, England)|date = 1 November 2014|pmc = 4253321|pmid = 25293652|pages = 346–369|volume = 20|issue = 4|doi = 10.1002/dys.1484|first1 = Marco|last1 = Pino|first2 = Luigina|last2 = Mortari}}</ref> | |||
Since at least the 1960s in the UK, the children diagnosed with developmental dyslexia have consistently been from privileged families.<ref name=":0">{{cite web|last=Kale|first=Sirin|date=17 September 2020|title=The Battle over Dyslexia|url=http://www.theguardian.com/news/2020/sep/17/battle-over-dyslexia-warwickshire-staffordshire|access-date=28 September 2020|website=The Guardian|language=en}}</ref> Although half of prisoners in the UK have significant reading difficulties, very few have ever been evaluated for dyslexia.<ref name=":0" /> Access to some special educational resources and funding is contingent upon having a diagnosis of dyslexia.<ref name=":0" /> As a result, when ] and ] proposed in 2018 to teach reading to all children with reading difficulties, using techniques proven to be successful for most children with a diagnosis of dyslexia, without first requiring the families to obtain an official diagnosis, dyslexia advocates and parents of children with dyslexia were fearful that they were losing a privileged status.<ref name=":0" /> | |||
There are many different national legal statutes and different national special education support structures with regard to special education provision which relate to the ]. | |||
=== |
===Stigma and success=== | ||
{{ |
{{see also|List of people with dyslexia}} | ||
Due to the various cognitive processes that dyslexia affects and the overwhelming societal stigma around the disability, individuals with dyslexia often employ behaviors of self-stigma and perfectionistic self-presentation in order to cope with their disability.<ref name=":1">{{cite journal |last1=Stoeber |first1=Joachim |last2=Rountree |first2=Margaret L. |title=Perfectionism, self-stigma, and coping in students with dyslexia: The central role of perfectionistic self-presentation |journal=Dyslexia (Chichester, England) |date=February 2021 |volume=27 |issue=1 |pages=62–78 |doi=10.1002/dys.1666 |pmid=32803909 |s2cid=221144226 |issn=1099-0909|doi-access=free }}</ref> The perfectionist self-presentation is when an individual attempts to present themselves as the perfect ideal image and hides any imperfections.<ref name=":1" /> This behavior presents serious risk as it often results in mental health issues and refusal to seek help for their disability.<ref name=":1" /> | |||
There have been a number of films, television programs, and works of fiction which focus on the topic of dyslexia. | |||
Albert Einstein had Dyslexia. | |||
==Research== | ==Research== | ||
{{ |
{{Further|Dyslexia research}} | ||
] | |||
The majority of currently available dyslexia research relates to the ], and especially to languages of ] origin. However, substantial research is also available regarding dyslexia for speakers of Arabic, Chinese, and Hebrew.<ref name="DevelopmentalDyslexia"/><ref>{{Cite web|url=http://www3.interscience.wiley.com/journal/118567835/abstract |title=Dyslexia assessment in Arabic. Gad Elbeheri. 2006; Journal of Research in Special Educational Needs – Wiley InterScience |work= |accessdate=}}</ref><ref>{{Cite journal|author=Smythe I, Everatt J, Al-Menaye N, ''et al.'' |title=Predictors of word-level literacy amongst Grade 3 children in five diverse languages |journal=Dyslexia |volume=14 |issue=3 |pages=170–87 |year=2008 |month=August |pmid=18697190 |doi=10.1002/dys.369 |url=}}</ref><ref>{{Cite journal|author=Friedmann N, Rahamim E |title=Developmental letter position dyslexia |journal=J Neuropsychol |volume=1 |issue=Pt 2 |pages=201–36 |year=2007 |month=September |pmid=19331018 |doi= 10.1348/174866407X204227|url=}}</ref><ref>{{Cite journal|author=Schiff R, Raveh M |title=Deficient morphological processing in adults with developmental dyslexia: another barrier to efficient word recognition? |journal=Dyslexia |volume=13 |issue=2 |pages=110–29 |year=2007 |month=May |pmid=17557687 |doi= 10.1002/dys.322|url=}}</ref> | |||
Most dyslexia research relates to ]s, and especially to ].<ref name="Reid2012a">{{cite book|last1=Reid|first1=Gavin|title=The Routledge Companion to Dyslexia|url=https://books.google.com/books?id=QrBQAmfXYooC&pg=PA16|year=2012|publisher=Routledge|isbn=978-1-136-61710-2|page=16|url-status=live|archive-url=https://web.archive.org/web/20170109205019/https://books.google.com/books?id=QrBQAmfXYooC&pg=PA16|archive-date=9 January 2017}}</ref> However, substantial research is also available regarding people with dyslexia who speak Arabic, Chinese, Hebrew, or other languages.<ref>{{cite journal|last1=Richlan|first1=Fabio|title=Functional neuroanatomy of developmental dyslexia; the role of orthographic depth|journal=Frontiers in Human Neuroscience|date=May 2014|pmid=24904383|doi=10.3389/fnhum.2014.00347|pmc=4033006|volume=8|pages=347|doi-access=free}}</ref> The outward expression of individuals with reading disability, and regular poor readers, is the same in some respects.<ref>{{cite web |title=Reading Difficulty and Disability |url=https://report.nih.gov/NIHfactsheets/Pdfs/ReadingDifficultyandDisability(NICHD).pdf |website=report.nih.gov |publisher=NIH |access-date=10 January 2019 |archive-url=https://web.archive.org/web/20190211145918/https://report.nih.gov/nihfactsheets/Pdfs/ReadingDifficultyandDisability(NICHD).pdf |archive-date=11 February 2019 |url-status=dead }}</ref> | |||
===Neuroimaging=== | |||
{{details|Neurological research into dyslexia}} | |||
Modern ] techniques such as ] (]) and ] (]) have produced clear evidence of structural differences in the brains of children with reading difficulties. It has been found that people with dyslexia have a deficit in parts of the left hemisphere of the brain involved in reading, which includes the ], ], and middle and ].<ref>{{Cite journal|author=Cao F, Bitan T, Chou TL, Burman DD, Booth JR |title=Deficient orthographic and phonological representations in children with dyslexia revealed by brain activation patterns |journal=Journal of Child Psychology and Psychiatry, and Allied Disciplines |volume=47 |issue=10 |pages=1041–50 |year=2006 |month=October |pmid=17073983 |pmc=2617739 |doi=10.1111/j.1469-7610.2006.01684.x }}</ref> | |||
That dyslexia is neurobiological in origin is supported by what Lyon et al. proclaimed as "overwhelming and converging data from functional brain imaging investigations" (2003, p. 3). The results of these studies suggest that there are observable differences in how the dyslexic brain functions when compared to the brain of a typical reader. Using fMRI, Shaywitz found that good readers show a consistent pattern of strong activation in the back of the brain with weaker activation in the front of the brain during reading tasks. In contrast, the brain activation pattern in dyslexics is the opposite during reading tasks—the frontal part of the brain becomes overactive with weaker activation in the back. Shaywitz points out ''"It is as if these struggling readers are using the systems in the front of the brain to try to compensate for the disruption in the back of the brain."''<ref name="Shaywitz">{{Cite book|last=Shaywitz |first=Sally |year=2003 |title=Overcoming dyslexia: a new and complete science-based program for reading problems at any level |publisher=Vintage Books |page=81 |isbn=0-679-78159-5}}</ref> | |||
Brain activation studies using PET to study language have produced a breakthrough in understanding of the neural basis of language over the past decade. A neural basis for the visual ] and for auditory verbal ] components have been proposed,<ref>{{Cite journal|author=Chertkow H, Murtha S |title=PET activation and language |journal=Clinical Neuroscience |volume=4 |issue=2 |pages=78–86 |year=1997 |pmid=9059757 |url=http://www.nlm.nih.gov/medlineplus/nuclearscans.html |format=Free full text}}</ref> with some implication that the observed neural manifestation of developmental dyslexia is task-specific (i.e., functional rather than structural).<ref>{{Cite journal|author=McCrory E, Frith U, Brunswick N, Price C |title=Abnormal functional activation during a simple word repetition task: A PET study of adult dyslexics |journal=Journal of Cognitive Neuroscience |volume=12 |issue=5 |pages=753–62 |year=2000 |month=September |pmid=11054918 |doi=10.1162/089892900562570 }}</ref> | |||
A University of Hong Kong study argues that dyslexia affects different structural parts of children's brains depending on the language which the children read.<ref name=lang/> The study focused on comparing children that were raised reading English and children raised reading Chinese. This is supported in a review by T. Hadzibeganovic et al. (2010).<ref name="Cross-Linguistic Neuroimaging" >{{Cite journal| title = Cross-Linguistic Neuroimaging and Dyslexia: A Critical View | journal = Cortex | date = 2010 | first = Tarik| pmid = 20684952 | last = Hadzibeganovic | coauthors = Maurits van den Noort, Peggy Bosche, Matjaz Perc, Rosalinde van Kralingen, Katrien Mondt and Max Coltheart| doi = 10.1016/j.cortex.2010.06.011 | url = http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B8JH1-50GMMRS-1&_nxudi=B8JH1-50GMMRS-4&_rdoc=7&_srch=doc-info%28%23toc%2343685%239999%23999999999%2399999%23FLA%23display%23Articles%29&_user=10&_fmt=high&_orig=browse&_ct=103&_sort=d&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=27144b316a7271c0b170bf7966c54b66 | accessdate = 2010-07-17}}</ref> | |||
A University of Maastricht (Netherlands) study revealed that adult dyslexic readers underactivate superior ] for the integration of letters and speech sounds.<ref>{{Cite journal|author=Blau V, van Atteveldt N, Ekkebus M, Goebel R, Blomert L |title=Reduced neural integration of letters and speech sounds links phonological and reading deficits in adult dyslexia |journal=Current Biology |volume=19 |issue=6 |pages=503–8 |year=2009 |month=March |pmid=19285401 |doi=10.1016/j.cub.2009.01.065 }}</ref> | |||
===Genetic=== | |||
{{details|Genetic research into dyslexia}} | |||
Molecular studies have linked several forms of dyslexia to ].<ref>{{Cite journal|author=Grigorenko EL, Wood FB, Meyer MS |title=Susceptibility loci for distinct components of developmental dyslexia on chromosomes 6 and 15 |journal=American Journal of Human Genetics |volume=60 |issue=1 |pages=27–39 |year=1997 |month=January |pmid=8981944 |pmc=1712535 }}</ref> | |||
Several candidate genes have been identified, including at the two regions first related to dyslexia: ]<ref name='Shastry' >{{Cite journal|author=Shastry BS |title=Developmental dyslexia: an update |journal=J. Hum. Genet. |volume=52 |issue=2 |pages=104–9 |year=2007 |pmid=17111266 |doi=10.1007/s10038-006-0088-z |url=}}</ref><ref name=DCDC2>{{Cite journal|author=Meng H, Smith SD, Hager K |title=DCDC2 is associated with reading disability and modulates neuronal development in the brain |journal=Proc. Natl. Acad. Sci. U.S.A. |volume=102 |issue=47 |pages=17053–8 |year=2005 |month=November |pmid=16278297 |pmc=1278934 |doi=10.1073/pnas.0508591102 |last12=Skudlarski |first12=P |last13=Shaywitz |first13=SE |last14=Shaywitz |first14=BA |last15=Marchione |first15=K |last16=Wang |first16=Y |last17=Paramasivam |first17=M |last18=Loturco |first18=JJ |last19=Page |first19=GP |last20=Gruen |first20=JR |url=http://www.pnas.org/cgi/pmidlookup?view=long&pmid=16278297 }}</ref> and ]<ref name='Shastry'/><ref>{{Cite journal|author=Paracchini S, Steer CD, Buckingham LL |title=Association of the KIAA0319 dyslexia susceptibility gene with reading skills in the general population |journal=The American Journal of Psychiatry |volume=165 |issue=12 |pages=1576–84 |year=2008 |month=December |pmid=18829873 |doi=10.1176/appi.ajp.2008.07121872 }}</ref> on ],<ref name="Genes cognition communication"/><ref>{{Cite journal|author=Grigorenko EL, Wood FB, Meyer MS, Pauls DL |title=Chromosome 6p influences on different dyslexia-related cognitive processes: further confirmation |journal=American Journal of Human Genetics |volume=66 |issue=2 |pages=715–23 |year=2000 |month=February |pmid=10677331 |pmc=1288124 |doi=10.1086/302755 }}</ref> and ] on ].<ref name="Genes cognition communication"/><ref name='Shastry'/> | |||
A 2007 review reported that no specific cognitive processes are known to be influenced by the proposed susceptibility genes.<ref>{{Cite journal|author=Schumacher J, Hoffmann P, Schmäl C, Schulte-Körne G, Nöthen MM |title=Genetics of dyslexia: the evolving landscape |journal=Journal of Medical Genetics |volume=44 |issue=5 |pages=289–97 |year=2007 |month=May |pmid=17307837 |pmc=2597981 |doi=10.1136/jmg.2006.046516 }}</ref> | |||
A unifying theoretical framework of three ] components provides a systems perspective for discussing past and new findings in a 12-year research program that point to heterogeneity in the genetic and brain basis and behavioral expression of dyslexia.<ref>{{Cite journal|author=Berninger VW, Raskind W, Richards T, Abbott R, Stock P |title=A multidisciplinary approach to understanding developmental dyslexia within working-memory architecture: genotypes, phenotypes, brain, and instruction |journal=Developmental Neuropsychology |volume=33 |issue=6 |pages=707–44 |year=2008 |pmid=19005912 |doi=10.1080/87565640802418662 }}</ref> | |||
===Controversy=== | |||
{{details|Dyslexia research|Controversy}} | |||
In recent years there has been significant debate on the categorization of dyslexia. In particular, Elliot and Gibbs argue that "attempts to distinguish between categories of 'dyslexia' and 'poor reader' or 'reading disabled' are scientifically unsupportable, arbitrary and thus potentially discriminatory".<ref name='Elliot1'>{{Cite journal | |||
|title=Does Dyslexia Exist? | |||
|journal=Journal of Philosophy of Education, | |||
|year=2008 | |||
|first= Julian G. | |||
|last=Elliott | |||
|volume=42|issue=3–4 | |||
|pages=475–491 | |||
|doi=10.1111/j.1467-9752.2008.00653.x | |||
|last2=Gibbs | |||
|first2=Simon}}</ref> | |||
While acknowledging that reading disability is a valid scientific curiosity, and that "seeking greater understanding of the relationship between visual symbols and spoken language is crucial" and that while there was "potential of genetics and neuroscience for guiding assessment and educational practice at some stage in the future", they conclude that "there is a mistaken belief that current knowledge in these fields is sufficient to justify a category of dyslexia as a subset of those who encounter reading difficulties". | |||
==See also== | ==See also== | ||
* ], difficulty comprehending numbers and math | |||
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* ] | * ] | ||
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== References == | ||
{{Reflist}} | |||
<references group="nb"/> | |||
{{Academic peer reviewed|Q=Q73053061|doi-access=free}} | |||
== Further reading == | |||
==References== | |||
{{ |
{{refbegin|30em}} | ||
* {{cite journal | vauthors = Ramus F, Altarelli I, Jednoróg K, Zhao J, Scotto di Covella L | title = Neuroanatomy of developmental dyslexia: Pitfalls and promise | journal = Neuroscience and Biobehavioral Reviews | volume = 84 | pages = 434–452 | date = January 2018 | pmid = 28797557 | doi = 10.1016/j.neubiorev.2017.08.001 | s2cid = 33176236 }} | |||
* {{cite book|url=https://books.google.com/books?id=wMR4AgAAQBAJ&pg=PP1|title=Dyslexia, Reading and the Brain: A Sourcebook of Psychological and Biological Research|first = Alan | last = Beaton |date=14 October 2004|publisher=Psychology Press|isbn=978-1-135-42275-2}} | |||
==External links== | |||
* {{cite book|url=https://books.google.com/books?id=8OywcklCBPkC&pg=PP1|title=Fifty Years in Dyslexia Research| first = Thomas Richard | last = Miles |date=4 August 2006|publisher=Wiley|isbn=978-0-470-02747-9|author-link=Thomas Richard Miles}} | |||
* | |||
* {{cite book|url=https://books.google.com/books?id=szJZ1LDQv7YC&pg=PP1|title=Dyslexia in Context: Research, Policy and Practice| vauthors = Reid G, Fawcett A |date=12 May 2008|publisher=John Wiley & Sons|isbn=978-0-470-77801-2}} | |||
* | |||
* {{cite book|url=https://books.google.com/books?id=7Jbvue2kNdYC&pg=PP1|title=The Psychology of Dyslexia: A Handbook for Teachers with Case Studies|first = Michael | last = Thomson |date=18 March 2009|publisher=John Wiley & Sons|isbn=978-0-470-74197-9}} | |||
* {{cite book|url=https://books.google.com/books?id=EFh4kCrMbK4C&pg=PP1|title=Dyslexia| first = Gavin | last = Reid |date=17 March 2011|publisher=A&C Black|isbn=978-1-4411-6585-5|edition=3}} | |||
;Research papers, articles and media | |||
* {{cite book|url=https://books.google.com/books?id=K2xdsMJ1MWgC&pg=PP1|title=Dyslexia and Other Learning Difficulties| first = Mark | last = Selikowitz |date=2 July 2012|publisher=Oxford University Press|isbn=978-0-19-969177-7}} | |||
* | |||
* {{cite book|url=https://books.google.com/books?id=EgXsAgAAQBAJ&pg=PP1|title=Reading, Writing and Dyslexia: A Cognitive Analysis| first = Andrew W. | last = Ellis |date=25 February 2014|publisher=Psychology Press|isbn=978-1-317-71630-3}} | |||
* | |||
* {{cite book|url=https://books.google.com/books?id=4lz2AgAAQBAJ&pg=PP1|title=The Dyslexia Debate| vauthors = Elliott JG, Grigorenko EL |date=24 March 2014|publisher=Cambridge University Press|isbn=978-0-521-11986-3|author-link=Julian Elliott}} | |||
* {{cite book|url=https://books.google.com/books?id=oXe6BAAAQBAJ&pg=PP1|title=Dyslexia and Us: A collection of personal stories|last1=Agnew|first1=Susie|last2=Stewart|first2=Jackie|last3=Redgrave|first3=Steve|date=8 October 2014|publisher=Andrews UK Limited|isbn=978-1-78333-250-2 }} | |||
<!-- Please do not remove the organization list from this article. thank you. --> | |||
* {{cite journal | vauthors = Norton ES, Beach SD, Gabrieli JD | title = Neurobiology of dyslexia | journal = Current Opinion in Neurobiology | volume = 30 | pages = 73–8 | date = February 2015 | pmid = 25290881 | pmc = 4293303 | doi = 10.1016/j.conb.2014.09.007 | hdl = 1721.1/102416 }} | |||
;Organizations | |||
* {{cite journal | vauthors = Serrallach B, Groß C, Bernhofs V, Engelmann D, Benner J, Gündert N, Blatow M, Wengenroth M, Seitz A, Brunner M, Seither S, Parncutt R, Schneider P, Seither-Preisler A | title = Neural Biomarkers for Dyslexia, ADHD, and ADD in the Auditory Cortex of Children | journal = Frontiers in Neuroscience | volume = 10 | pages = 324 | year = 2016 | pmid = 27471442 | doi = 10.3389/fnins.2016.00324 | pmc = 4945653 | doi-access = free }} | |||
*] | |||
* {{cite journal | vauthors = Shao S, Niu Y, Zhang X, Kong R, Wang J, Liu L, Luo X, Zhang J, Song R | title = Opposite Associations between Individual KIAA0319 Polymorphisms and Developmental Dyslexia Risk across Populations: A Stratified Meta-Analysis by the Study Population | journal = Scientific Reports | volume = 6 | pages = 30454 | date = July 2016 | pmid = 27464509 | pmc = 4964335 | doi = 10.1038/srep30454 | bibcode = 2016NatSR...630454S }} | |||
* | |||
* {{cite journal | vauthors = Brewer CC, Zalewski CK, King KA, Zobay O, Riley A, Ferguson MA, Bird JE, McCabe MM, Hood LJ, Drayna D, Griffith AJ, Morell RJ, Friedman TB, Moore DR | title = Heritability of non-speech auditory processing skills | journal = European Journal of Human Genetics | volume = 24 | issue = 8 | pages = 1137–44 | date = August 2016 | pmid = 26883091 | pmc = 4872837 | doi = 10.1038/ejhg.2015.277 }} | |||
* | |||
* {{cite journal | vauthors = Mascheretti S, De Luca A, Trezzi V, Peruzzo D, Nordio A, Marino C, Arrigoni F | title = Neurogenetics of developmental dyslexia: from genes to behavior through brain neuroimaging and cognitive and sensorial mechanisms | journal = Translational Psychiatry | volume = 7 | issue = 1 | pages = e987 | date = January 2017 | pmid = 28045463 | pmc = 5545717 | doi = 10.1038/tp.2016.240 }} | |||
* | |||
* {{cite journal | vauthors = Fraga González G, Žarić G, Tijms J, Bonte M, van der Molen MW | title = Contributions of Letter-Speech Sound Learning and Visual Print Tuning to Reading Improvement: Evidence from Brain Potential and Dyslexia Training Studies | journal = Brain Sciences | volume = 7 | issue = 1 | pages = 10 | date = January 2017 | pmid = 28106790 | pmc = 5297299 | doi = 10.3390/brainsci7010010 | doi-access = free }} | |||
* | |||
* {{cite journal | vauthors = Rudov A, Rocchi MB, Accorsi A, Spada G, Procopio AD, Olivieri F, Rippo MR, Albertini MC | title = Putative miRNAs for the diagnosis of dyslexia, dyspraxia, and specific language impairment | journal = Epigenetics | volume = 8 | issue = 10 | pages = 1023–9 | date = October 2013 | pmid = 23949389 | pmc = 3891682 | doi = 10.4161/epi.26026 }} | |||
* | |||
* {{cite journal | vauthors = Vágvölgyi R, Coldea A, Dresler T, Schrader J, Nuerk HC | title = A Review about Functional Illiteracy: Definition, Cognitive, Linguistic, and Numerical Aspects | journal = Frontiers in Psychology | volume = 7 | pages = 1617 | year = 2016 | pmid = 27891100 | pmc = 5102880 | doi = 10.3389/fpsyg.2016.01617 | doi-access = free }} | |||
{{refend}} | |||
== External links == | |||
{{Spoken Misplaced Pages|date=2022-09-02|En-Dyslexia-article.ogg}} | |||
{{Scholia|topic}} | |||
{{Library resources box|by=no|onlinebooks=no|about=yes|lcheading=dyslexia}} | |||
{{Medical resources | |||
| DiseasesDB = 4016 | |||
| ICD11 = {{ICD11|6A03.0}} (developmental), {{ICD11|MB4B.0}} | |||
| ICD10 = {{ICD10|F81.0}} (developmental), {{ICD10|R48.0}} | |||
| ICD9 = {{ICD9|315.02}} | |||
| ICDO = | |||
| OMIM = 127700 | |||
| MedlinePlus = 001406 | |||
| eMedicineSubj = article | |||
| eMedicineTopic = 1835801 | |||
| MeshID = D004410 | |||
| Scholia = Q132971 | |||
}} | |||
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Latest revision as of 13:05, 23 December 2024
Specific learning disability characterized by troubles with readingMedical condition
Dyslexia | |
---|---|
Other names | Reading disorder |
Difficulties in processing letters and words | |
Specialty | Neurology, pediatrics |
Symptoms | Trouble reading |
Usual onset | School age |
Types | Surface dyslexia |
Causes | Genetic and environmental factors |
Risk factors | Family history, attention deficit hyperactivity disorder |
Diagnostic method | Series memory, spelling, vision, and reading test |
Differential diagnosis | Hearing or vision problems, insufficient teaching |
Treatment | Adjusting teaching methods |
Frequency | 3–7% |
Dyslexia, previously known as word blindness, is a learning disability that affects either reading or writing. Different people are affected to different degrees. Problems may include difficulties in spelling words, reading quickly, writing words, "sounding out" words in the head, pronouncing words when reading aloud and understanding what one reads. Often these difficulties are first noticed at school. The difficulties are involuntary, and people with this disorder have a normal desire to learn. People with dyslexia have higher rates of attention deficit hyperactivity disorder (ADHD), developmental language disorders, and difficulties with numbers.
Dyslexia is believed to be caused by the interaction of genetic and environmental factors. Some cases run in families. Dyslexia that develops due to a traumatic brain injury, stroke, or dementia is sometimes called "acquired dyslexia" or alexia. The underlying mechanisms of dyslexia result from differences within the brain's language processing. Dyslexia is diagnosed through a series of tests of memory, vision, spelling, and reading skills. Dyslexia is separate from reading difficulties caused by hearing or vision problems or by insufficient teaching or opportunity to learn.
Treatment involves adjusting teaching methods to meet the person's needs. While not curing the underlying problem, it may decrease the degree or impact of symptoms. Treatments targeting vision are not effective. Dyslexia is the most common learning disability and occurs in all areas of the world. It affects 3–7% of the population; however, up to 20% of the general population may have some degree of symptoms. While dyslexia is more often diagnosed in boys, this is partly explained by a self-fulfilling referral bias among teachers and professionals. It has even been suggested that the condition affects men and women equally. Some believe that dyslexia is best considered as a different way of learning, with both benefits and downsides.
Classification
Main article: Pure alexiaDyslexia is divided into developmental and acquired forms. Acquired dyslexia occurs subsequent to neurological insult, such as traumatic brain injury or stroke. People with acquired dyslexia exhibit some of the signs or symptoms of the developmental disorder, but require different assessment strategies and treatment approaches. Pure alexia, also known as agnosic alexia or pure word blindness, is one form of alexia which makes up "the peripheral dyslexia" group.
Signs and symptoms
See also: Characteristics of dyslexiaIn early childhood, symptoms that correlate with a later diagnosis of dyslexia include delayed onset of speech and a lack of phonological awareness. A common myth closely associates dyslexia with mirror writing and reading letters or words backwards. These behaviors are seen in many children as they learn to read and write, and are not considered to be defining characteristics of dyslexia.
School-age children with dyslexia may exhibit signs of difficulty in identifying or generating rhyming words, or counting the number of syllables in words—both of which depend on phonological awareness. They may also show difficulty in segmenting words into individual sounds (such as sounding out the three sounds of k, a, and t in cat) or may struggle to blend sounds, indicating reduced phonemic awareness.
Difficulties with word retrieval or naming things is also associated with dyslexia. People with dyslexia are commonly poor spellers, a feature sometimes called dysorthographia or dysgraphia, which depends on the skill of orthographic coding.
Problems persist into adolescence and adulthood and may include difficulties with summarizing stories, memorization, reading aloud, or learning foreign languages. Adults with dyslexia can often read with good comprehension, though they tend to read more slowly than others without a learning difficulty and perform worse in spelling tests or when reading nonsense words—a measure of phonological awareness.
Associated conditions
Dyslexia often co-occurs with other learning disorders, but the reasons for this comorbidity have not been clearly identified. These associated disabilities include:
- Dysgraphia
- A disorder involving difficulties with writing or typing, sometimes due to problems with eye–hand coordination; it also can impede direction- or sequence-oriented processes, such as tying knots or carrying out repetitive tasks. In dyslexia, dysgraphia is often multifactorial, due to impaired letter-writing automaticity, organizational and elaborative difficulties, and impaired visual word forming, which makes it more difficult to retrieve the visual picture of words required for spelling.
- Attention deficit hyperactivity disorder (ADHD)
- A disorder characterized by problems sustaining attention, hyperactivity, or acting impulsively. Dyslexia and ADHD commonly occur together. Approximately 15% or 12–24% of people with dyslexia have ADHD; and up to 35% of people with ADHD have dyslexia.
- Auditory processing disorder
- A listening disorder that affects the ability to process auditory information. This can lead to problems with auditory memory and auditory sequencing. Many people with dyslexia have auditory processing problems, and may develop their own logographic cues to compensate for this type of deficit. Some research suggests that auditory processing skills could be the primary shortfall in dyslexia.
- Developmental coordination disorder
- A neurological condition characterized by difficulty in carrying out routine tasks involving balance, fine-motor control and kinesthetic coordination; difficulty in the use of speech sounds; and problems with short-term memory and organization.
Causes
Researchers have been trying to find the neurobiological basis of dyslexia since the condition was first identified in 1881. For example, some have tried to associate the common problem among people with dyslexia of not being able to see letters clearly to abnormal development of their visual nerve cells.
Neuroanatomy
Neuroimaging techniques, such as functional magnetic resonance imaging (fMRI) and positron emission tomography (PET), have shown a correlation between both functional and structural differences in the brains of children with reading difficulties. Some people with dyslexia show less activation in parts of the left hemisphere of the brain involved with reading, such as the inferior frontal gyrus, inferior parietal lobule, and the middle and ventral temporal cortex. Over the past decade, brain activation studies using PET to study language have produced a breakthrough in the understanding of the neural basis of language. Neural bases for the visual lexicon and for auditory verbal short-term memory components have been proposed, with some implication that the observed neural manifestation of developmental dyslexia is task-specific (i.e., functional rather than structural). fMRIs of people with dyslexia indicate an interactive role of the cerebellum and cerebral cortex as well as other brain structures in reading.
The cerebellar theory of dyslexia proposes that impairment of cerebellum-controlled muscle movement affects the formation of words by the tongue and facial muscles, resulting in the fluency problems that some people with dyslexia experience. The cerebellum is also involved in the automatization of some tasks, such as reading. The fact that some children with dyslexia have motor task and balance impairments could be consistent with a cerebellar role in their reading difficulties. However, the cerebellar theory has not been supported by controlled research studies.
Genetics
Research into potential genetic causes of dyslexia has its roots in post-autopsy examination of the brains of people with dyslexia. Observed anatomical differences in the language centers of such brains include microscopic cortical malformations known as ectopias, and more rarely, vascular micro-malformations, and microgyrus—a smaller than usual size for the gyrus. The previously cited studies and others suggest that abnormal cortical development, presumed to occur before or during the sixth month of fetal brain development, may have caused the abnormalities. Abnormal cell formations in people with dyslexia have also been reported in non-language cerebral and subcortical brain structures. Several genes have been associated with dyslexia, including DCDC2 and KIAA0319 on chromosome 6, and DYX1C1 on chromosome 15.
Gene–environment interaction
The contribution of gene–environment interaction to reading disability has been intensely studied using twin studies, which estimate the proportion of variance associated with a person's environment and the proportion associated with their genes. Both environmental and genetic factors appear to contribute to reading development. Studies examining the influence of environmental factors such as parental education and teaching quality have determined that genetics have greater influence in supportive, rather than less optimal, environments. However, more optimal conditions may just allow those genetic risk factors to account for more of the variance in outcome because the environmental risk factors have been minimized.
As environment plays a large role in learning and memory, it is likely that epigenetic modifications play an important role in reading ability. Measures of gene expression, histone modifications, and methylation in the human periphery are used to study epigenetic processes; however, all of these have limitations in the extrapolation of results for application to the human brain.
Language
The orthographic complexity of a language directly affects how difficult it is to learn to read it. English and French have comparatively "deep" phonemic orthographies within the Latin alphabet writing system, with complex structures employing spelling patterns on several levels: letter-sound correspondence, syllables, and morphemes. Languages such as Spanish, Italian and Finnish primarily employ letter-sound correspondence—so-called "shallow" orthographies—which makes them easier to learn for people with dyslexia. Logographic writing systems, such as Chinese characters, have extensive symbol use; and these also pose problems for dyslexic learners.
Pathophysiology
For most people who are right-hand dominant, the left hemisphere of their brain is more specialized for language processing. With regard to the mechanism of dyslexia, fMRI studies suggest that this specialization is less pronounced or absent in people with dyslexia. In other studies, dyslexia is correlated with anatomical differences in the corpus callosum, the bundle of nerve fibers that connects the left and right hemispheres.
Data via diffusion tensor MRI indicate changes in connectivity or in gray matter density in areas related to reading and language. Finally, the left inferior frontal gyrus has shown differences in phonological processing in people with dyslexia. Neurophysiological and imaging procedures are being used to ascertain phenotypic characteristics in people with dyslexia, thus identifying the effects of dyslexia-related genes.
Dual route theory
The dual-route theory of reading aloud was first described in the early 1970s. This theory suggests that two separate mental mechanisms, or cognitive routes, are involved in reading aloud. One mechanism is the lexical route, which is the process whereby skilled readers can recognize known words by sight alone, through a "dictionary" lookup procedure. The other mechanism is the nonlexical or sublexical route, which is the process whereby the reader can "sound out" a written word. This is done by identifying the word's constituent parts (letters, phonemes, graphemes) and applying knowledge of how these parts are associated with each other, for example, how a string of neighboring letters sound together. The dual-route system could explain the different rates of dyslexia occurrence between different languages (e.g., the consistency of phonological rules in the Spanish language could account for the fact that Spanish-speaking children show a higher level of performance in non-word reading, when compared to English-speakers).
Diagnosis
Dyslexia is a heterogeneous, dimensional learning disorder that impairs accurate and fluent word reading and spelling. Typical—but not universal—features include difficulties with phonological awareness; inefficient and often inaccurate processing of sounds in oral language (phonological processing); and verbal working memory deficits.
Dyslexia is a neurodevelopmental disorder, subcategorized in diagnostic guides as a learning disorder with impairment in reading (ICD-11 prefixes "developmental" to "learning disorder"; DSM-5 uses "specific"). Dyslexia is not a problem with intelligence. Emotional problems often arise secondary to learning difficulties. The National Institute of Neurological Disorders and Stroke describes dyslexia as "difficulty with phonological processing (the manipulation of sounds), spelling, and/or rapid visual-verbal responding".
The British Dyslexia Association defines dyslexia as "a learning difficulty that primarily affects the skills involved in accurate and fluent word reading and spelling" and is characterized by "difficulties in phonological awareness, verbal memory and verbal processing speed". Phonological awareness enables one to identify, discriminate, remember (working memory), and mentally manipulate the sound structures of language—phonemes, onsite-rime segments, syllables, and words.
Assessment
The following can be done to assess for dyslexia:
Apply a multidisciplinary team approach involving the child's parent(s) and teacher(s), school psychologist, pediatrician, and, as appropriate, speech and language pathologist (speech therapist), and occupational therapist.
Gain familiarity with typical ages children reach various general developmental milestones, and domain-specific milestones, such as phonological awareness (recognizing rhyming words; identifying the initial sounds in words).
Do not rely on tests exclusively. Careful observation of the child in the school and home environments, and sensitive, comprehensive parental interviews are just as important as tests.
Look at the empirically supported response to intervention (RTI) approach, which "... involves monitoring the progress of a group of children through a programme of intervention rather than undertaking a static assessment of their current skills. Children with the most need are those who fail to respond to effective teaching, and they are readily identified using this approach."
Assessment tests
There is a wide range of tests that are used in clinical and educational settings to evaluate the possibility of dyslexia. If initial testing suggests that a person might have dyslexia, such tests are often followed up with a full diagnostic assessment to determine the extent and nature of the disorder. Some tests can be administered by a teacher or computer; others require specialized training and are given by psychologists. Some test results indicate how to carry out teaching strategies. Because a variety of different cognitive, behavioral, emotional, and environmental factors all could contribute to difficulty learning to read, a comprehensive evaluation should consider these different possibilities. These tests and observations can include:
- General measures of cognitive ability, such as the Wechsler Intelligence Scale for Children, Woodcock-Johnson Tests of Cognitive Abilities, or Stanford-Binet Intelligence Scales. Low general cognitive ability would make reading more difficult. Cognitive ability measures also often try to measure different cognitive processes, such as verbal ability, nonverbal and spatial reasoning, working memory, and processing speed. There are different versions of these tests for different age groups. Almost all of these require additional training to give and score correctly, and are done by psychologists. According to Mather and Schneider (2015), a confirmatory profile and/or pattern of scores on cognitive tests confirming or ruling-out reading disorder has not yet been identified.
- Screening or evaluation for mental health conditions: Parents and teachers can complete rating scales or behavior checklists to gather information about emotional and behavioral functioning for younger people. Many checklists have similar versions for parents, teachers, and younger people old enough to read reasonably well (often 11 years and older) to complete. Examples include the Behavioral Assessment System for Children, and the Strengths and Difficulties Questionnaire. All of these have nationally representative norms, making it possible to compare the level of symptoms to what would be typical for the younger person's age and biological sex. Other checklists link more specifically to psychiatric diagnoses, such as the Vanderbilt ADHD Rating Scales or the Screen for Child Anxiety Related Emotional Disorders (SCARED). Screening uses brief tools that are designed to catch cases with a disorder, but they often get false positive scores for people who do not have the disorder. Screeners should be followed up by a more accurate test or diagnostic interview as a result. Depressive disorders and anxiety disorders are two-three times higher in people with dyslexia, and attention-deficit/hyperactivity disorder is more common, as well.
- Review of academic achievement and skills: Average spelling/reading ability for a dyslexic is a percentage ranking <16, well below normal. In addition to reviewing grades and teacher notes, standardized test results are helpful in evaluating progress. These include group administered tests, such as the Iowa Tests of Educational Development, that a teacher may give to a group or whole classroom of younger people at the same time. They also could include individually administered tests of achievement, such as the Wide Range Achievement Test, or the Woodcock-Johnson (which also includes a set of achievement tests). The individually administered tests again require more specialized training.
Screening
Screening procedures seek to identify children who show signs of possible dyslexia. In the preschool years, a family history of dyslexia, particularly in biological parents and siblings, predicts an eventual dyslexia diagnosis better than any test. In primary school (ages 5–7), the ideal screening procedure consists of training primary school teachers to carefully observe and record their pupils' progress through the phonics curriculum, and thereby identify children progressing slowly. When teachers identify such students they can supplement their observations with screening tests such as the Phonics screening check used by United Kingdom schools during Year one.
In the medical setting, child and adolescent psychiatrist M. S. Thambirajah emphasizes that "iven the high prevalence of developmental disorders in school-aged children, all children seen in clinics should be systematically screened for developmental disorders irrespective of the presenting problem/s." Thambirajah recommends screening for developmental disorders, including dyslexia, by conducting a brief developmental history, a preliminary psychosocial developmental examination, and obtaining a school report regarding academic and social functioning.
Management
Main article: Management of dyslexiaThrough the use of compensation strategies, therapy and educational support, individuals with dyslexia can learn to read and write. There are techniques and technical aids that help to manage or conceal symptoms of the disorder. Reducing stress and anxiety can sometimes improve written comprehension. For dyslexia intervention with alphabet-writing systems, the fundamental aim is to increase a child's awareness of correspondences between graphemes (letters) and phonemes (sounds), and to relate these to reading and spelling by teaching how sounds blend into words. Reinforced collateral training focused on reading and spelling may yield longer-lasting gains than oral phonological training alone. Early intervention can be successful in reducing reading failure.
Research does not suggest that specially-tailored fonts (such as Dyslexie and OpenDyslexic) help with reading. Children with dyslexia read text set in a regular font such as Times New Roman and Arial just as quickly, and they show a preference for regular fonts over specially-tailored fonts. Some research has pointed to increased letter-spacing being beneficial.
There is currently no evidence showing that music education significantly improves the reading skills of adolescents with dyslexia.
Prognosis
Dyslexic children require special instruction for word analysis and spelling from an early age. The prognosis, generally speaking, is positive for individuals who are identified in childhood and receive support from friends and family. The New York educational system (NYED) indicates "a daily uninterrupted 90-minute block of instruction in reading" and "instruction in phonemic awareness, phonics, vocabulary development, reading fluency" so as to improve the individual's reading ability.
Epidemiology
The prevalence of dyslexia is unknown, but it has been estimated to be as low as 5% and as high as 17% of the population. Dyslexia is diagnosed more often in males.
There are different definitions of dyslexia used throughout the world. Further, differences in writing systems may affect development of written language ability due to the interplay between auditory and written representations of phonemes. Dyslexia is not limited to difficulty in converting letters to sounds, and Chinese people with dyslexia may have difficulty converting Chinese characters into their meanings. The Chinese vocabulary uses logographic, monographic, non-alphabet writing where one character can represent an individual phoneme.
The phonological-processing hypothesis attempts to explain why dyslexia occurs in a wide variety of languages. Furthermore, the relationship between phonological capacity and reading appears to be influenced by orthography.
History
Main article: History of dyslexia researchDyslexia was clinically described by Oswald Berkhan in 1881, but the term dyslexia was coined in 1883 by Rudolf Berlin, an ophthalmologist in Stuttgart. He used the term to refer to the case of a young boy who had severe difficulty learning to read and write, despite showing typical intelligence and physical abilities in all other respects. In 1896, W. Pringle Morgan, a British physician from Seaford, East Sussex, published a description of a reading-specific learning disorder in a report to the British Medical Journal titled "Congenital Word Blindness". The distinction between phonological versus surface types of dyslexia is only descriptive, and without any etiological assumption as to the underlying brain mechanisms. However, studies have alluded to potential differences due to variation in performance. Over time, the consensus has changed from an intelligence-based model to an age-based model for dyslexia .
Society and culture
See also: List of artistic depictions of dyslexiaAs is the case with any disorder, society often makes an assessment based on incomplete information. Before the 1980s, dyslexia was thought to be a consequence of education, rather than a neurological disability. As a result, society often misjudges those with the disorder. There is also sometimes a workplace stigma and negative attitude towards those with dyslexia. If the instructors of a person with dyslexia lack the necessary training to support a child with the condition, there is often a negative effect on the student's learning participation.
Since at least the 1960s in the UK, the children diagnosed with developmental dyslexia have consistently been from privileged families. Although half of prisoners in the UK have significant reading difficulties, very few have ever been evaluated for dyslexia. Access to some special educational resources and funding is contingent upon having a diagnosis of dyslexia. As a result, when Staffordshire and Warwickshire proposed in 2018 to teach reading to all children with reading difficulties, using techniques proven to be successful for most children with a diagnosis of dyslexia, without first requiring the families to obtain an official diagnosis, dyslexia advocates and parents of children with dyslexia were fearful that they were losing a privileged status.
Stigma and success
See also: List of people with dyslexiaDue to the various cognitive processes that dyslexia affects and the overwhelming societal stigma around the disability, individuals with dyslexia often employ behaviors of self-stigma and perfectionistic self-presentation in order to cope with their disability. The perfectionist self-presentation is when an individual attempts to present themselves as the perfect ideal image and hides any imperfections. This behavior presents serious risk as it often results in mental health issues and refusal to seek help for their disability.
Research
Further information: Dyslexia researchMost dyslexia research relates to alphabetic writing systems, and especially to European languages. However, substantial research is also available regarding people with dyslexia who speak Arabic, Chinese, Hebrew, or other languages. The outward expression of individuals with reading disability, and regular poor readers, is the same in some respects.
See also
- Dyscalculia, difficulty comprehending numbers and math
- Learning to read
- Orton-Gillingham
- List of people with dyslexia
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Further reading
- Ramus F, Altarelli I, Jednoróg K, Zhao J, Scotto di Covella L (January 2018). "Neuroanatomy of developmental dyslexia: Pitfalls and promise". Neuroscience and Biobehavioral Reviews. 84: 434–452. doi:10.1016/j.neubiorev.2017.08.001. PMID 28797557. S2CID 33176236.
- Beaton A (14 October 2004). Dyslexia, Reading and the Brain: A Sourcebook of Psychological and Biological Research. Psychology Press. ISBN 978-1-135-42275-2.
- Miles TR (4 August 2006). Fifty Years in Dyslexia Research. Wiley. ISBN 978-0-470-02747-9.
- Reid G, Fawcett A (12 May 2008). Dyslexia in Context: Research, Policy and Practice. John Wiley & Sons. ISBN 978-0-470-77801-2.
- Thomson M (18 March 2009). The Psychology of Dyslexia: A Handbook for Teachers with Case Studies. John Wiley & Sons. ISBN 978-0-470-74197-9.
- Reid G (17 March 2011). Dyslexia (3 ed.). A&C Black. ISBN 978-1-4411-6585-5.
- Selikowitz M (2 July 2012). Dyslexia and Other Learning Difficulties. Oxford University Press. ISBN 978-0-19-969177-7.
- Ellis AW (25 February 2014). Reading, Writing and Dyslexia: A Cognitive Analysis. Psychology Press. ISBN 978-1-317-71630-3.
- Elliott JG, Grigorenko EL (24 March 2014). The Dyslexia Debate. Cambridge University Press. ISBN 978-0-521-11986-3.
- Agnew S, Stewart J, Redgrave S (8 October 2014). Dyslexia and Us: A collection of personal stories. Andrews UK Limited. ISBN 978-1-78333-250-2.
- Norton ES, Beach SD, Gabrieli JD (February 2015). "Neurobiology of dyslexia". Current Opinion in Neurobiology. 30: 73–8. doi:10.1016/j.conb.2014.09.007. hdl:1721.1/102416. PMC 4293303. PMID 25290881.
- Serrallach B, Groß C, Bernhofs V, Engelmann D, Benner J, Gündert N, Blatow M, Wengenroth M, Seitz A, Brunner M, Seither S, Parncutt R, Schneider P, Seither-Preisler A (2016). "Neural Biomarkers for Dyslexia, ADHD, and ADD in the Auditory Cortex of Children". Frontiers in Neuroscience. 10: 324. doi:10.3389/fnins.2016.00324. PMC 4945653. PMID 27471442.
- Shao S, Niu Y, Zhang X, Kong R, Wang J, Liu L, Luo X, Zhang J, Song R (July 2016). "Opposite Associations between Individual KIAA0319 Polymorphisms and Developmental Dyslexia Risk across Populations: A Stratified Meta-Analysis by the Study Population". Scientific Reports. 6: 30454. Bibcode:2016NatSR...630454S. doi:10.1038/srep30454. PMC 4964335. PMID 27464509.
- Brewer CC, Zalewski CK, King KA, Zobay O, Riley A, Ferguson MA, Bird JE, McCabe MM, Hood LJ, Drayna D, Griffith AJ, Morell RJ, Friedman TB, Moore DR (August 2016). "Heritability of non-speech auditory processing skills". European Journal of Human Genetics. 24 (8): 1137–44. doi:10.1038/ejhg.2015.277. PMC 4872837. PMID 26883091.
- Mascheretti S, De Luca A, Trezzi V, Peruzzo D, Nordio A, Marino C, Arrigoni F (January 2017). "Neurogenetics of developmental dyslexia: from genes to behavior through brain neuroimaging and cognitive and sensorial mechanisms". Translational Psychiatry. 7 (1): e987. doi:10.1038/tp.2016.240. PMC 5545717. PMID 28045463.
- Fraga González G, Žarić G, Tijms J, Bonte M, van der Molen MW (January 2017). "Contributions of Letter-Speech Sound Learning and Visual Print Tuning to Reading Improvement: Evidence from Brain Potential and Dyslexia Training Studies". Brain Sciences. 7 (1): 10. doi:10.3390/brainsci7010010. PMC 5297299. PMID 28106790.
- Rudov A, Rocchi MB, Accorsi A, Spada G, Procopio AD, Olivieri F, Rippo MR, Albertini MC (October 2013). "Putative miRNAs for the diagnosis of dyslexia, dyspraxia, and specific language impairment". Epigenetics. 8 (10): 1023–9. doi:10.4161/epi.26026. PMC 3891682. PMID 23949389.
- Vágvölgyi R, Coldea A, Dresler T, Schrader J, Nuerk HC (2016). "A Review about Functional Illiteracy: Definition, Cognitive, Linguistic, and Numerical Aspects". Frontiers in Psychology. 7: 1617. doi:10.3389/fpsyg.2016.01617. PMC 5102880. PMID 27891100.
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