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首页> 外文期刊>International journal of psychophysiology: official journal of the International Organization of Psychophysiology >Priming emotional facial expressions as evidenced by event-related brain potentials.
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Priming emotional facial expressions as evidenced by event-related brain potentials.

机译：启动与事件相关的脑电势所证明的情感面部表情。

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摘要

As human faces are important social signals in everyday life, processing of facial affect has recently entered into the focus of neuroscientific research. In the present study, priming of faces showing the same emotional expression was measured with the help of event-related potentials (ERPs) in order to investigate the temporal characteristics of processing facial expressions. Participants classified portraits of unfamiliar persons according to their emotional expression (happy or angry). The portraits were either preceded by the face of a different person expressing the same affect (primed) or the opposite affect (unprimed). ERPs revealed both early and late priming effects, independent of stimulus valence. The early priming effect was characterized by attenuated frontal ERP amplitudes between 100 and 200 ms in response to primed targets. Its dipole sources were localised in the inferior occipitotemporal cortex, possibly related to the detection of expression-specific facial configurations, and in the insular cortex, considered to be involved in affective processes. The late priming effect, an enhancement of the late positive potential (LPP) following unprimed targets, may evidence greater relevance attributed to a change of emotional expressions. Our results (i) point to the view that a change of affect-related facial configuration can be detected very early during face perception and (ii) support previous findings on the amplitude of the late positive potential being rather related to arousal than to the specific valence of an emotional signal.
机译：由于人脸在日常生活中是重要的社交信号，因此面部表情的处理近来已成为神经科学研究的重点。在本研究中，借助事件相关电位（ERP）测量了显示相同情绪表达的面孔的涂底漆，以调查处理面部表情的时间特征。参与者根据陌生人的表情（高兴或生气）对肖像进行分类。在肖像之前，或者是其他人的面孔表达相同的情感（引发）或相反的情感（未引发）。 ERPs揭示了早期和晚期启动效应，与刺激价无关。早期启动效应的特征是响应于启动目标，额叶ERP振幅在100到200 ms之间衰减。它的偶极子源位于枕下颞叶皮层中，可能与表情特定的面部构造的检测有关，以及位于岛突皮层中，被认为与情感过程有关。晚期启动效应，即未启动靶标后晚期正电位（LPP）的增强，可能表明情感表达的变化具有更大的相关性。我们的结果（i）认为可以在面部感知期间很早地检测出与情感相关的面部构造的变化，并且（ii）支持先前关于晚期正电位幅度的发现，而这与唤醒而不是特定的情绪信号的价。

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