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What did Paul Broca believe was the main indicator of intelligence?
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Broca believed that there were other factors that were more important. These included prognathic facial angles, with closer to right angles indicating higher intelligence, and the cephalic index relationship between the brain's length and width, that was directly proportional with intelligence, with the most intelligent European group being 'long headed', while the least intelligent Negro group being'short headed'. He thought that the most important aspect, was the relative size between the frontal and rear areas of the brain, with Caucasians having