As you can see, there is an extremely high correlation between brain size and IQ in children aged 6-15. Basically, the larger your brain, the higher your IQ. Researchers imaged the brains of 164 children aged 6-15 and attempted to estimate their IQ's based on brain size. The estimates correlated very highly with the true IQ's of the subjects. The correlations were .718 using one method and and .684 using another method. That is an average correlation of ~.7 combining both measures. That is an fantastic correlation in the social sciences, where good correlations are hard to come by.
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from The Russophile's http://ift.tt/1O8GLQn