That illusion is long gone - dead from 60 years of trying this and that intervention to close the gap and none working. Where's the cultural energy behind a new Head Start? Gone - dead The only people left are the absurd academics who pretend to be unconvinced of genetic causeshttps://twitter.com/Outsideness/status/1406122718341124102 …
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Replying to @CovfefeAnon
A highly predictive polygenic score for intelligence would be the coup de grace. My understanding is that it’s a ways away
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Replying to @BernoulliDefect
There is no coup de grace because the goalposts shift. Every particular argument that gets made is undermined by some fact and the rebuttal is merely to shift the ground. How do you argue that racism causes differences in brain volume / gestation period / pelvic opening width?
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Replying to @CovfefeAnon @BernoulliDefect
It's hard to know what "there are differences" means when no one reports effect sizes!! It looks like gestational period is only d≈0.5 (pieced together from https://pubmed.ncbi.nlm.nih.gov/2292982/ reporting 5 days average diff., and https://pubmed.ncbi.nlm.nih.gov/17139400/ reporting 9 day standard deviation)
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Replying to @zackmdavis @BernoulliDefect
Fair enough - the other effects are more clearly measured and there are confounds for gestation period because of Caesarian births but the effect is in the same direction as the others and really hard to imagine as anything other than the result of species difference.
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Replying to @CovfefeAnon @BernoulliDefect
Um. I wasn't trying to claim anything about genetic vs. environmental causes. A statistical effect can be both genetic and small at the same time! (Politically, anti-egalitarians tend to argue both "large diffs" and "genetic diffs", but politics doesn't control reality.)
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I mean, maybe you want to say d=0.5 is "medium" rather than "small" following Cohen 1988 (https://en.wikipedia.org/wiki/Effect_size#Cohen's_d …)? My interest is that the numbers/facts are what they are no matter which English words you want to choose for political spin
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Replying to @zackmdavis @BernoulliDefect
This particular set of facts is an example of (a variation on) "the map is not the territory". The physical facts aren't meaningful in themselves - their value is that all the excuses for rejecting the genetic explanation *for other differences* utterly fail to explain them.
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As a slogan - "how does 'racism' explain brain size differences?" Maybe one can reply with something about malnutrition but that argument is absurd - malnutrition that is so severe and systemic that it lowers IQ consistently but doesn't lower athletic outcomes?
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