Journal
NEUROREPORT
Volume 16, Issue 17, Pages 1905-1908Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/01.wnr.0000186596.64458.76
Keywords
amygdala; extraversion; gray matter concentration; neuroticism; voxel-based morphometry
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Using high-resolution magnetic resonance imaging and voxel-based morphometry in 41 healthy individuals, this study evaluated the association between the personality traits of extraversion and neuroticism, on the one hand, and individual differences in localized brain volume and gray matter concentration, on the other, with a special focus on the annygdala. Extraversion was positively correlated with gray matter concentration in the left amygdala, whereas neuroticism was negatively correlated with gray matter concentration in the right amygdala. Given that neuroticism is a risk factor for depression, our finding offers one explanation as to why prior structural imaging studies of depressed patients (which did not control for personality) produced conflicting findings. Furthermore, our data are consistent with the view that annygdala reduction seen in depressed patients precedes the onset of the disease, rather than being a consequence of the illness.
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