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
Paper URL: https://www.ncbi.nlm.nih.gov/pubmed/10781101 Nisbett's claim is in his 2009 book, appendix A.
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so you're saying we still don't know
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