Face-selective processing and the effect of pleasant and unpleasant emotional expressions on ERP correlates

被引:134
|
作者
Balconi, M
Pozzili, U
机构
[1] Catholic Univ Milan, Dept Psychol, Ctr Commun Psychol, I-20133 Milan, Italy
[2] IRCCS, Bioengn Lab, Lecco, Italy
关键词
face processing; event-related potentials; facial affect; arousal;
D O I
10.1016/S0167-8760(03)00081-3
中图分类号
B84 [心理学];
学科分类号
04 ; 0402 ;
摘要
Previous studies have revealed that decoding of facial-expressions starts very early in the brain ( approximate to 180 ms post-stimulus) and might be processed separately from the basic stage of face perception. In order to explore brain potentials (ERPs) related to decoding of facial-expressions and the effect of emotional valence of the stimulus, we analyzed 18 normal subjects. Faces with five basic emotional expressions (fear, anger, surprise, happiness, sadness) and neutral stimulus were presented in random order. The results demonstrated that an emotional face elicited a negative peak at approximately 230 ms (N230), distributed mainly over the posterior site for each emotion. The electrophysiological activity observed may represent specific cognitive processing underlying the decoding of emotional facial-expressions. Nevertheless, differences in peak amplitude were observed for high-arousal negative expressions compared with positive (happiness) and low-arousal expressions (sadness). N230 amplitude increased in response to anger, fear and surprise, suggesting that subjects' ERP variations are affected by experienced emotional intensity, related to arousal and unpleasant value of the stimulus. (C) 2003 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:67 / 74
页数:8
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