According to the Focus on Neuroscience box: "The Neuroscience of Personality: Brain Structures and the Big Five," researchers have found that extraversion is associated with larger brain tissue volume in the:

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Extraversion has been associated with larger brain tissue volume in the medial orbitofrontal cortex, a region involved in processing reward information and making decisions based on reward. This association supports the idea that extraverted individuals may be more sensitive to positive social stimuli due to the structure of their brains.

According to the Focus on Neuroscience Box: "The Neuroscience of Personality