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Norman G. Angleson's avatar

Easy explanation:

Same reason that girls score the same or better than boys at 12-13 before boys begin doing better in adulthood. People gain in intelligence from undergoing puberty, so the people who go through puberty earlier will be more intelligent *at the time* even if they ultimately end up dumber in adulthood. I don't see any mention in these papers of when the age of testing happened.

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Peter Frost's avatar

Phil Rushton wanted to create a unified theory that could explain variation in intelligence, sexual maturation, and reproductive strategy for all human populations. In my opinion, he was too ambitious. Different human populations have followed different evolutionary trajectories in different natural and cultural environments. It's naïve to think that one can explain all human variation with a single theory — other than Darwin's theory of evolution by natural selection.

Yes, early sexual maturation and lower cognitive ability generally characterize the highly polygynous farming populations that originated in West Africa and later spread over most of the continent. But those two characteristics are not inevitably associated with each other — even within Africa. The Igbo were able to specialize in trade (because of their position at the Niger's mouth) and thus underwent selection for higher cognitive ability. I wouldn't be surprised if they still show a stronger propensity for polygyny and an earlier age of sexual maturation.

In short, there is a general association between higher cognitive ability, higher age of sexual maturation, and lower propensity for polygyny. But it seems to be a very distal association that is mediated by other factors, particularly the degree of female food autonomy. If women cannot feed themselves and their children without male assistance, they will abandon food gathering and specialize in activities with a higher level of cognitive input, like shelter building, garment making, meat processing, and use of kilns for metallurgy. This was notably the case with the populations of northern Eurasia.

https://evoandproud.blogspot.com/2014/01/the-first-industrial-revolution.html

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