In a new paper at the (conveniently open) journal The Winnower (h/t @whyvert), building on his earlier work, geneticist Davide Piffer has tried to calculate the genotypic IQs of various world populations, and how they compare to measured phenotypic IQ.
As far I can see, the methodology is sound (perhaps apart from a few quibbles over phenotypic IQ sources). But this is exceedingly minor, and doesn’t really change anything in a material way. So I will focus here mostly on the real world impacts these findings would imply.
As one might expect, there is a gap – usually a very significant one – between calculated genotypic and measured phenotypic IQ in developing countries. This is only logical, since developing countries frequently suffer from a variety of maladies, such as malnutrition and parasitic disease load, that are almost entirely absent in the First World. These maladies have a negative impact on IQ. (To a very large extent this also explains the Flynn Effect of secular rises in IQ in the developed world. Effectively, developing nations may be considered as living in the the First World’s past).
Read full, original article: Genetics, IQ, and Convergence