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433 Brain scans reveal a shocking difference between psychopaths and other people

ScienceDaily
ScienceDaily 3 place · 05/10/2026 07:05 EDT

Scientists have uncovered a striking brain difference linked to psychopathy: people with psychopathic traits were found to have a striatum — a brain region tied to reward, motivation, and decision-making — that was about 10% larger on average than those without such traits. Using MRI scans and psychological assessments on 120 participants, researchers connected this enlarged brain region to thrill-seeking, impulsive behavior, and a stronger drive for stimulation.

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