Face-selective processing and the effect of pleasant and unpleasant emotional expressions on ERP correlates
Face-selective processing and the effect of pleasant and unpleasant emotional expressions on ERP correlates
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DOI：
10.1016/s0167-8760(03)00081-3
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发表时间：
2003-07-01
影响因子：
3
通讯作者：
Pozzili, U
中科院分区：
文献类型：
--
作者：
Balconi, M;Pozzili, U
先前的研究表明，面部表情的解码在大脑中很早就开始了（大约在刺激后 180 毫秒），并且可能与面部感知的基本阶段分开处理。为了探索与面部表情解码相关的大脑电位 (ERP) 以及刺激情绪效价的影响，我们分析了 18 名正常受试者。具有五种基本情绪表达（恐惧、愤怒、惊讶、快乐、悲伤）和中性刺激的面孔以随机顺序呈现。结果表明，情绪化的面孔在大约 230 毫秒 (N230) 处引发负峰值，主要分布在每种情绪的后部位置。观察到的电生理活动可能代表了情绪面部表情解码背后的特定认知处理。然而，与积极（快乐）和低唤醒表达（悲伤）相比，高唤醒消极表达的峰值幅度存在差异。 N230 振幅因愤怒、恐惧和惊讶而增加，表明受试者的 ERP 变化受到经历过的情绪强度的影响，与刺激的唤醒和不愉快的价值有关。 (C) 2003 Elsevier Science B.V. 保留所有权利。
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.