According to many (I cannot find a source at the moment), Albert Einstein's brain weighed less than average.
It is a common belief that there is no correlation between brain mass and intelligence. Is this true?
Canadian researchers found a link between brain size and intelligence:
but this correlation doesn't necessarily mean causation, as seen in...
No, there is a substantial correlation between brain size and intelligence. The most current citation I know of is a paper from McDaniel 2005, titled: Big-brained people are smarter: A meta-analysis of the relationship between in vivo brain volume and intelligence
The abstract reads:
Not all brain regions are equal in contributing to this relationship however; the size of certain tracts, grey-matter tracts in the frontal cortex IIRC (it's been a while since I studied this myself) are the primary determiner of intelligence, as determined by IQ. Allometric scaling probably contributes to this correlation; for example, if a gene unleashes checks on brain growth to enable greater intelligence, it might have a pleiotropic effect on other regions, so that they have to grow bigger as well, though they don't directly contribute to the intelligence of the person whose brain they make up.
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