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What did Paul Broca believe was the most important factor in determining intelligence?
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Broca believed that the most important factor in determining intelligence was the relative size between the frontal and rear areas of the brain. He believed that the frontal area of the brain was the most important because it was the area that controlled the ability to think abstractly and plan ahead. He believed that the rear area of the brain was the most important because it was the area that controlled the ability to learn new things.