As frequent visitors know I am a big fan of intelligence -related studies and feel they are most important. If nothing else doing such work is difficult and courageous, because it often flies in the face of political correctness.
Anyway my friend and correspondent Liron pointed out this article: The decline of the world's IQ, by Richard Lynn and John Harvey, and suggests this trend be referred to as the Lynn effect, in counterpoint to the Flynn effect, which is the observation that many human populations have seen an increase in their measured IQ over time. Here's the abstract of the paper:
The global effect predicted by this paper is somewhat less pronounced than the extrapolations I made in IQ and populations, but are of the same order. I considered differential fertility rates between different countries; this study is more precise, and considers differential fertility rates within countries, based on differential rates between different segments of a population. There is another effect based on generation size which could also be considered, which would directionally reinforce these other two effects.
I'm delighted to learn that there is a Journal called Intelligence devoted to "research and theoretical studies that contribute to the understanding of Intelligence", and plan to subscribe. (Stay tuned!)
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