According to a recent review of research by Pietschnig et al. ,what is the average correlation between brain size (as measured by MRI scan)and mental ability test scores?

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The average correlation between brain size, as measured by MRI scans, and mental ability test scores is .24, according to the review of research by Pietschnig et al. This indicates a positive, albeit modest, relationship between the two variables.

According to a Recent Review of Research by Pietschnig Et