스트레스 상황에서 외향적-내향적 성격 차원에 따른사건관련전위의 개인차 연구

Abstract

The aim of the present study is to elucidate the differences in neural correlates in a vigilance task performance according to stress level between extraverts and introverts. Forty-three subjects were assigned to two groups (21 extraverts; 9 males, 22 introverts; 9 males). Subjects in the two groups performed a vigilance task either under a social stress or not during the event-related potential (ERP) recording. Results showed that the response accuracies of both groups in the stress condition were higher than those in the no-stress condition. ERPs revealed that (1) N2-P2 peak-to-peak amplitudes and contingent negative variation (CNV) mean amplitudes in the introversion group were significantly greater than those in the extraversion group, (2) the N2-P2 peak-to-peak amplitudes increased significantly at Fz site in the stress condition in the extraversion group. These results suggest that introverts may sustain higher level of arousal than extraverts, regardless of stress condition, and extraverts may show augmented arousal or attention levels, specifically in performance under stress.