Leppänen Jukka M, Hietanen Jari K, Koskinen Krista
Human Information Processing Laboratory, Department of Psychology, FIN-33014, University of Tampere, Tampere, Finland.
Biol Psychol. 2008 May;78(2):150-8. doi: 10.1016/j.biopsycho.2008.02.002. Epub 2008 Feb 16.
Several event-related potential (ERP) studies have demonstrated a negative shift in ERPs for fearful relative to neutral facial expressions approximately 170-300 ms post-stimulus over occipital-temporal scalp. In the present study, three experiments were conducted to examine the importance of the eye region for this ERP differentiation. ERPs and behavioral discrimination responses were measured to fearful and neutral expressions when only the eye region of the expression was visible (the eyes and eyebrows or the eyes alone) and when the eye region (the eyes and eyebrows or the eyes alone) was covered by dark glasses. The results showed a negative shift in ERPs for fearful relative to neutral expressions over lateral temporal sites, starting approximately 160-210 ms post-stimulus. The visibility of the eye region but not the eyes per se was critical for these ERP differences to occur. There were, however, indications that information in the eyes is also coded and used in the categorization of facial expressions.
多项事件相关电位（ERP）研究表明，相对于中性面部表情，恐惧面部表情在刺激后约170 - 300毫秒时，枕颞头皮上的ERP会出现负向偏移。在本研究中，进行了三项实验来检验眼部区域对这种ERP差异的重要性。当仅表情的眼部区域可见（眼睛和眉毛或仅眼睛）以及当眼部区域（眼睛和眉毛或仅眼睛）被墨镜遮住时，测量对恐惧和中性表情的ERP及行为辨别反应。结果显示，相对于中性表情，在颞叶外侧部位，ERP从刺激后约160 - 210毫秒开始出现负向偏移。眼部区域的可见性而非眼睛本身对于这些ERP差异的出现至关重要。然而，有迹象表明眼睛中的信息也在面部表情分类中被编码和使用。
