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| ==References== | ==References== | ||
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| * James F. Crow. 1997. The high spontaneous mutation rate: Is it a health risk? ''Proc. Natl. Acad. Sci. USA'' '''94''', 8380-8386. | * James F. Crow. 1997. The high spontaneous mutation rate: Is it a health risk? ''Proc. Natl. Acad. Sci. USA'' '''94''', 8380-8386. | ||
| * Teasdale, Thomas W., and David R. Owen. (2005). "A long-term rise and recent decline in intelligence test performance: The Flynn Effect in reverse." ''Personality and Individual Differences.'' 39(4):837-843. | * Teasdale, Thomas W., and David R. Owen. (2005). "A long-term rise and recent decline in intelligence test performance: The Flynn Effect in reverse." ''Personality and Individual Differences.'' 39(4):837-843. | ||
Revision as of 22:06, 28 March 2006
Dysgenics is the evolutionary weakening of an organism relative to its environment, often due to relaxation of natural selection or the occurrence of negative selection. This can happen when negative mutations occur without ramification to the organism and accumulate in the species.
In biology, "dysgenesis" refers to faulty or abnormal organ or development — in such cases the organ is then said to be dysgenic.
Dysgenics in humans
The term first came into use as an opposite of eugenics, a social philosophy advocating improvement of human hereditary qualities, often by social programs or government intervention.
According to the Oxford English Dictionary, the term "dysgenic" was first used as an adjective as early as 1915 to describe the "dysgenic effect" of World War I. Amongst eugenicists of this time period, war was initially thought to have a eugenic effect, as it killed off the less fit men of a population. During WWI, however, it became quickly clear that even the fit men were as likely to die from modern warfare as anyone else, and war was seen as killing off only the physically fit male members of the population whilst the disabled stayed safely at home.
During World War II the United States had difficulty training low-IQ military recruits; this led Congress to ban enlistment by those with an IQ below 80.
The term fell out of use after eugenic thought lost popularity in the 1930s, and when used again by the Nobel laureate William Shockley in his controversial advocacy of eugenics it received bad press.
Dysgenics: Genetic deterioration in modern populations is also the title of a controversial 1996 book by the psychologist Richard Lynn, in which he argued that intelligence in Western nations had been decreasing due to dysgenics and conjectures that China may overtake the West due to continued deterioration of intelligence in the Western nations, especially the USA.
This used to be contrasted with the Flynn effect, the steady increase of IQ in Asian and Western nations during the 20th century. Current research shows that the Flynn effect might have already ended around 1990 in several European nations. Teasdale & Owen (2005) "report intelligence test results from over 500,000 young Danish men, tested between 1959 and 2004, showing that performance peaked in the late 1990s, and has since declined moderately to pre-1991 levels." They speculate that "a contributing factor in this recent fall could be a simultaneous decline in proportions of students entering 3-year advanced-level school programs for 16–18 year olds."
Another recent study done by Professor of Education Philip Adey and psychology professor Michael Shayer also show that the Flynn effect may have ended in the United Kingdom. According to Professor Adey, “The intelligence of 11-year-olds has fallen by three years’ worth in the past two decades.” The study compared results of IQ tests taken by 11 year old children in 2005, the mid 1990s, and 1976, showing a precipitous drop in average IQ.
References
- Failing to teach them how to handle real life, Children are less able than they used to be, Intelligence in UK declining?
- James F. Crow. 1997. The high spontaneous mutation rate: Is it a health risk? Proc. Natl. Acad. Sci. USA 94, 8380-8386.
- Teasdale, Thomas W., and David R. Owen. (2005). "A long-term rise and recent decline in intelligence test performance: The Flynn Effect in reverse." Personality and Individual Differences. 39(4):837-843.