Neuroscience For Dummies, 2nd Edition
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A weak but statistically significant correlation exists between brain size and intelligence in humans. In a nutshell, there is a general consensus that animals capable of what appears to be intelligent behavior, such as apes and dolphins, have larger brains than less intelligent animals, such as lizards.

Despite the correlation, however, variability in humans is enormous. Average human brain weight is about 1,500 grams (about 10 percent less than the estimate for Neanderthal brains, by the way). Einstein's brain weighed in at about 1,230 grams, which is about 18 percent below average. He did, on the other hand, have somewhat wider than normal parietal lobes, which may have contributed to his mathematical ability.

Clearly, total brain size is only one attribute that underlies intelligence. Brain size may represent a potential capability, like height, that has advantages in some intellectual arenas but not others. The American autodidact Chris Langan, who has a very large head and scores at record levels on some IQ tests, is employed as a bar bouncer.

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Frank Amthor is a professor of psychology at the University of Alabama at Birmingham, where he also holds secondary appointments in the UAB Medical School Department of Neurobiology, the School of Optometry, and the Department of Biomedical Engineering. His research is focused on retinal and central visual processing and neural prostheses.

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