Size matters

One of the canards of of the liberal elite is that IQ isn't real.  One of the best statements of this is Stephen Jay Gould's "The Mismeasure of Man" which asserts that general intelligence doesn't correlate with anything at all, and is just an artifact of the testing process.

From Science Daily:

A collaborative study led by researchers at the Montreal Neurological Institute (MNI), McGill University has demonstrated a positive link between cognitive ability and cortical thickness in the brains of healthy 6 to 18 year olds. The correlation is evident in regions that integrate information from different parts of the brain.
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Previous studies have shown that intelligence and cognitive ability are correlated with regional brain structure and function. The association between regional cortical thickness and intelligence has been little studied and most previous studies of normal children had a relatively small sample. So with improvements in MRI-based quantification of cortical thickness and a much larger sample, researchers aimed to examine this relationship and to further characterize and identify brain areas where cortical thickness was associated with cognitive performance.

Cortical thickness may in part reflect the amount of complex connections between nerve cells. In other words, thicker cortices are likely to have more complex connections with consequences on cognitive ability. A positive link between cortical thickness and cognitive ability was detected in many areas of the frontal, parietal, temporal and occipital lobes. The regions with the greatest relationship were the 'multi-modal association' areas, where information converges from various regions of the brain for processing.