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Culture War Roundup for the week of September 23, 2024

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What I am disagreeing with you is the idea that this will lead to some kind of average IQ convergence- more than likely the black/white gap will grow for a bit and then stay about the same.

To the extent that any IQ difference is caused by genetics, we should expect to see that IQ difference decline as greater admixture rates have been achieved. To the extent that IQ differences are caused by environmental factors, we should expect to see that IQ difference decline as those environmental differences have been declining.

For the gap to stay the same or increase despite changes to the putative causative factors would imply that something is off about our understanding of IQ and/or racial IQ, though I couldn't say in advance what.

Including my responses to your other comment here

I mean, the hybrid vigor hypothesis for IQ specifically seems pre-falsified- most of history's greatest geniuses were purebred members of endogamous groups

There’s a large number of countries where mixed-race people are the majority(most of them Spanish speaking) and the best and brightest from these countries seem to, generally, be not mixed, often specifically descended from high-IQ immigrants.

Re-reading my original comment, I think you're right that my hot take doesn't follow from its premises. So I'll alter it a little. "If theories about racial intelligence are correct* we should expect..."

(Here taking "theories about racial intelligence" to mean specifically theories about a genes that have reached fixation due to selection pressures at the race level.)

So far, you're right that we haven't actually seen much evidence of hybrid vigor in the domain of intelligence-- which is kind of the problem with these theories about racial intelligence. If you told me, "different corn breeds have different disease resistance capabilities," then I could posit that "it should therefore be possible to engineer hybrid varieties with superior disease resistance to any heritage line," and prove us both empirically correct. But I'm hearing "different races have different intellectual capabilities," and yet not seeing any of the superlative hybrid strains. I'm aware that isn't proof for the negative case (that no genetic intellectual difference exists), but it makes me unwilling to reject the null hypothesis.

If you (or the original study) do in fact convince me of racial differences, I'll switch to believing that hybrid vigour should occur, and that we just haven't tested the right crossbreeds yet.