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Risto_Saarelma comments on Welcome to Less Wrong! - Less Wrong
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The psychological diversity article you link to is about Gregory Cochran's and Henry Harpending's book, which is all about the thesis of human evolution within the last ten thousand years affecting the societies of different human populations in various ways. It includes a chapter about Ashkenazi Jews seeming to have a higher IQ than their surrounding populations due to genetics. So I'm not really sure what the difference you are going for here is.
That the evidence suggests there may be a genetic explanation for the higher IQ of Ashkenazim but not for the racial IQ gap.
I'm afraid you may be a bit confused on this. What are the odds that out of all ethnicities on the planet, only Ashkenazi Jews where the ones to develop a different IQ than the surrounding peoples? And only in the past thousand years or so. What about all those groups that have been isolated or differentiated in very different natural and even social environments for tens of thousands of years?
Unless you are using "the racial gap" to refer to the specific measured IQ differences between people of African, European and East Asian descent, which may indeed be caused by the envrionment, rather than the possibility of differences between human "races" in general. But even in that case the existence of ethnic genetic IQ differences should increase the probability of a genetic explanation somewhat.