The study adds new insight to a highly controversial question: What is intelligence, and how can we measure it? The research team examined a uniquely large data set of 241 brain-lesion patients who all had taken IQ tests. The researchers mapped the location of each patient's lesion in their brains, and correlated that with each patient's IQ score to produce a map of the brain regions that influence intelligence. The scientists found that, rather than residing in a single structure, general intelligence is determined by a network of regions across both sides of the brain. The researchers say the findings will open the door to further investigations about how the brain, intelligence, and environment all interact.
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