The Focus on Neuroscience box, "The Neuroscience of Personality: Brain Structure and the Big Five," described an MRI study that investigated whether personality traits are associated with differences in brain structure. Researchers found that _____ was associated with larger brain tissue volume in a brain region associated with sensitivity to rewarding stimuli, and _____ was associated with increased volume in a brain region associated with understanding the beliefs of others.

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The study found that extraversion was associated with larger brain tissue volume in a brain region associated with sensitivity to rewarding stimuli, and agreeableness was associated with increased volume in a brain region associated with understanding the beliefs of others.

The Focus on Neuroscience Box, "The Neuroscience of Personality: Brain