Nisbett (2009) claims that brain size is not causal for cognitive ability and cites a sibling study. Hmm! Let's check it out. N=36 pairs.pic.twitter.com/HUbwxPVMgj
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I checked that reference to a non-finding of White>Black for brain size. Turns out it's not about brain size, but head size.pic.twitter.com/dcHyDl17Xa
Could not find either primary source for these claims. Ancient old conference presentation and military publication.