The brain’s mass and the size of its prefrontal cortex – a region just behind the forehead – have long been believed to play a role in intelligence. New research published in the St. Louis-based Washington University Journal of Neuroscience suggests that up to ten percent of individual differences in intelligence lie in the strength of neural pathways between the brain and the left prefrontal cortex – the region linked to personality and cognitive behaviors.

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According to the study...
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