Monthly Archives: June 2013

What is behind the Flynn effect ?

The phenomenon known as secular IQ gains, or Lynn-Flynn Effect, is widely discussed. Extensive research has been done. Many theories have been proposed, such as nutrition, education, societal changes, for the most popular ones. Less commonly invoked are the genotype-environment … Continue reading

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Re-analysis of Jensen’s study of Capron and Duyme adoption data

The french adoption study, by Capron & Duyme (1989, Table 2; 1996, Table 3), attempted to show that IQ can be improved by adoption. Their numbers displayed an IQ gain of 15 or even 20 points (WISC-R). To recall, Jensen (1997) … Continue reading

Posted in Psychometrics | Tagged