Extraversion is a propensity for optimism, positive emotion, and sociability. Many studies
have explored the brain correlates of extraversion, and the results have mainly emphasized
the role of reward-related brain regions. However, it is unclear whether imaging studies of
the brain's reward system can show good test–retest reliability. We aim to investigate the
neuroanatomical correlates of extraversion and to examine the test–retest reliability of the
results. Voxel-based morphometry derived from MRI and the Revised NEO Personality …