A 2015 meta-analysis of 88 studies found that the correlation between human brain volume and intelligence is .24, a small-to-moderate size relationship. In new research that re-analyzed the data from the 2015 study, the authors showed that the strength of the link depends on how well IQ is measured and the degree to which studies include a full range of values for brain volume and IQ (For example, if only college students are included, many lower IQ people will be excluded, and this will shrink the correlation.)
Based on their analysis, the researchers estimated that the true brain volume/IQ correlation is around .40 -- a fairly strong correlation.
Keep in mind that many researchers have reported racial differences in brain volume that match up with IQ differences. Rushton and Ankney (2009) summarized the research. For example, Beals et al. (1984) measured the endocranial volumes of close to 20,000 skulls from around the world. The Asian-black gap was reported to be a roughly 150 cubic centimeter advantage for Asians.
If IQ is BS measure like Nassim Taleb says, why do high scorers have big brains?
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Sadly, I have a tiny hat size.
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