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03/05/2008: "World's IQ declines as "Flynn effect" reverses"

Dysgenic fertility means that there is a negative correlation between intelligence and number of children. Its presence during the last century has been demonstrated in several countries. We show here that there is dysgenic fertility in the world population quantified by a correlation of − 0.73 between IQ and fertility across nations.

It is estimated that the effect of this has been a decline in the world's genotypic IQ of 0.86 IQ points for the years 1950–2000. A further decline of 1.28 IQ points in the world's genotypic IQ is projected for the years 2000–2050.

In the period 1950–2000 this decline has been compensated for by a rise in phenotypic intelligence known as the Flynn Effect, but recent studies in four economically developed countries have found that this has now ceased or gone into reverse.

It seems probable that this “negative Flynn Effect” will spread to economically developing countries and the whole world will move into a period of declining genotypic and phenotypic intelligence. It is possible that “the new eugenics” of biotechnology may evolve to counteract dysgenic fertility.

[ The "Flynn effect" was an artifact of measurement and did not reflect actual increasing intelligence. Instead, intelligence is decreasing. ]

http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6W4M-4NKJ1FW-3&_user=10&_coverDate=04%2F27%2F2007&_alid=669075750&_rdoc=2&_fmt=summary&_orig=mlkt&_cdi=6546&_sort=v&_st=17&_docanchor=&view=c&_ct=94&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=cb8d1bedc127c883300a7829cb454ccf

The tendency for intelligence scores to rise appears to have ended in some places. Indeed, it seems that some countries are experiencing a Flynn effect with a reversed sign.

And they also found that overall scores, which had been rising for decades, reached a plateau. "Across the ‘90s, all of the tests stagnated," says Teasdale, referring to the four separate tests given to these men: one involving logical reasoning, another using verbal analogies, a third on completing number series and a fourth test of spatial ability that used geometric figures.

http://www.americanscientist.org/template/AssetDetail/assetid/51985