Categorical perception of happiness and fear facial expressions: an ERP study
Categorical perception of happiness and fear facial expressions: an ERP study
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DOI：
10.1162/089892902317236858
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发表时间：
2002-02-15
影响因子：
3.2
通讯作者：
Guerit, JM
中科院分区：
文献类型：
--
作者：
Campanella, S;Quinet, P;Guerit, JM
行为研究表明，两张不同的变形面孔被认为反映了相同的情感表达，这比两张不同的面孔更难区分。这种类别间差异相对于类别内差异的优势被经典地称为类别知觉效应，本研究采用事件相关电位（ERP）技术探讨了类别知觉效应对恐惧和快乐表情的时程影响。在延迟的同异匹配任务中呈现了三种类型的配对：（1）两个不同的变形面孔被视为相同的情感表达（类内差异），（2）另外两个反映两种不同情绪的类内差异（类别间差异），以及（3）两个相同的变形面孔（出于方法学目的，相同的面部）。在该对中的第二个面部开始之后，双侧枕-颞负电位（N170）和顶正电位（P150或VPP）的幅值在同一对内和同一对内相对于对间降低。这表明重复启动效应。我们还观察到P3 b波的调制，因为对之间的反应幅度高于对内和相同的对。这些结果表明，人类面部情绪表情的分类感知起源于双侧枕颞区，而典型的先前研究发现情绪调节的ERP成分要晚得多。
Behavioral studies have shown that two different morphed faces perceived as reflecting the same emotional expression are harder to discriminate than two faces considered as two different ones. This advantage of between-categorical differences compared with within-categorical ones is classically referred as the categorical perception effect.The temporal course of this effect on fear and happiness facial expressions has been explored through event-related potentials (ERPs). Three kinds of pairs were presented in a delayed same-different matching task: (1) two different morphed faces perceived as the same emotional expression (within-categorical differences), (2) two other ones reflecting twos different emotions (between-categorical differences), and (3) two identical morphed faces (same faces for methodological purpose).Following the second face onset in the pair, the amplitude of the bilateral occipito-temporal negativities (N170) and of the vertex positive potential (P150 or VPP) was reduced for within and same pairs relative to between pairs. This suggests a repetition priming effect. We also observed a modulation of the P3b wave, as the amplitude of the responses for the between pairs was higher than for the within and same pairs. These results indicate that the categorical perception of human facial emotional expressions has a perceptual origin in the bilateral occipito-temporal regions, while typical prior studies found emotion-modulated ERP components considerably later.