Emotion Effects on the N170: A Question of Reference?
Emotion Effects on the N170: A Question of Reference?
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DOI：
10.1007/s10548-012-0261-y
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发表时间：
2013-01-01
期刊：
影响因子：
2.7
通讯作者：
Schacht, Annekathrin
中科院分区：
文献类型：
--
作者：
Rellecke, Julian;Sommer, Werner;Schacht, Annekathrin
我们研究了面部表情中的情绪意义是否会对事件相关脑电位（ERP）中的N170所指示的面部特异性过程进行调制。结果表明，情绪调制的颞枕电极通常用于测量N170不太明显时，ERP被称为乳突比平均参考时被应用。这提供了一个潜在的解释，为什么到目前为止，文献已经产生了关于情绪面部表情对N170的影响的相互矛盾的证据。然而，N170和情绪效应在头皮上的空间分布在同一时间点是可区分的，这表明N170和情绪处理的神经源不同。我们的结论是，N170组件本身是不受情绪面部表情，重叠活动的情绪敏感的早期后负占振幅调制超过典型的N170电极。我们的研究结果与传统的面孔加工模型相一致，该模型假设面孔和情绪编码是平行和独立的过程。
We investigated whether face-specific processes as indicated by the N170 in event-related brain potentials (ERPs) are modulated by emotional significance in facial expressions. Results yielded that emotional modulations over temporo-occipital electrodes typically used to measure the N170 were less pronounced when ERPs were referred to mastoids than when average reference was applied. This offers a potential explanation as to why the literature has so far yielded conflicting evidence regarding effects of emotional facial expressions on the N170. However, spatial distributions of the N170 and emotion effects across the scalp were distinguishable for the same time point, suggesting different neural sources for the N170 and emotion processing. We conclude that the N170 component itself is unaffected by emotional facial expressions, with overlapping activity from the emotion-sensitive early posterior negativity accounting for amplitude modulations over typical N170 electrodes. Our findings are consistent with traditional models of face processing assuming face and emotion encoding to be parallel and independent processes.