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 correlation hypothesis, the heterosis, the life history model, the cultural bias, the rule-dependence model, or the assumption that the IQ test doesa not measure intelligence. It is even believed that Flynn gain is related to the black-white gap changes. None of the hypotheses advanced so far succeed to approach the “significance” of the Lynn-Flynn effect. There is, however, one conclusion that seems reasonable. The Flynn effect is not a Jensen effect. Intelligence has not increased.
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