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The d2 Test of Attention is a neuropsychological measure of selective and sustained attention and visual scanning speed. It is a paper and pencil test that asks participants to cross out any letter "d" with two marks around above it or below it in any order. The surrounding distractors are usually similar to the target stimulus, for example a "p" with two marks or a "d" with one or three marks. The original version of the test was created by Brickenkamp (1981) in Germany as a cancellation task. A meta-analysis, published in Personality and Individual Differences, found that adults have shown increasing scores in selective attention over the past three decades, as measured by the d2 Test of Attention.

References

1. Rhonda M. Ross (2005). The D2 Test of Attention: An Examination of Age, Gender, and Cross-cultural Indices. Argosy University.
2. Margaret Semrud-Clikeman; Phyllis Anne Teeter Ellison (15 June 2009). Child Neuropsychology: Assessment and Interventions for Neurodevelopmental Disorders, 2nd Edition. Springer. p. 111. ISBN 978-0-387-88963-4.
3. Michel Leclercq; Peter Zimmermann (4 April 2002). Applied Neuropsychology of Attention: Theory, Diagnosis and Rehabilitation. Psychology Press. p. 193. ISBN 978-1-135-43178-5.
4. Otfried Spreen (19 February 1998). A Compendium of Neuropsychological Tests: Administration, Norms, and Commentary. Oxford University Press. p. 240. ISBN 978-0-19-510019-8.
5. Hedrih, Vladimir (2024-01-14). "Selective attention scores of adults have been increasing over generations, study finds". PsyPost. Retrieved 2024-01-17.

Further reading

• Flanagan, Dawn P.; Harrison, Patti L., eds. (2012). Contemporary Intellectual Assessment: Theories, tests, and issues (Third ed.). New York (NY): Guilford Press. ISBN 978-1-60918-995-2. ERIC ED530599.
• Miller, Daniel C. (3 January 2013). Essentials of School Neuropsychological Assessment (2nd ed.). John Wiley & Sons. ISBN 978-1-118-17584-2. Retrieved 9 June 2014.

• Cognitive tests
• Neuropsychological tests