A shared mechanism for facial expression in human faces and face pareidolia.
A shared mechanism for facial expression in human faces and face pareidolia.
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DOI：
10.1098/rspb.2021.0966
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发表时间：
2021-07-14
期刊：
影响因子：
--
通讯作者：
Taubert J
中科院分区：
文献类型：
--
作者：
Alais D;Xu Y;Wardle SG;Taubert J
面部表情对社会交流至关重要，但其潜在的机制仍在被发现。从物体中感知的虚幻人脸(Face Pareidolia)是人脸检测的错误，它与人类的人脸加工具有相同的神经机制。然而，目前尚不清楚虚幻面孔的表情是否采用了与人类面孔相同的机制。在这里，我们使用序列依赖范式，研究了幻觉和人脸是否具有共同的表达机制。首先，我们发现，尽管视觉特征差异很大，但在观察者内部和观察者之间，面部偏执的图像都可以可靠地进行表达评级。其次，它们对感知到的面部表情表现出正向序列依赖，这意味着一张虚幻的脸(高兴或愤怒)被认为在表情上更类似于前一张脸，就像人类的脸一样。这表明，幻觉面孔和人类面孔参与了类似的时间连续性机制。第三，我们发现当错觉表情和人脸表情交错时，它们之间具有较强的跨域序列依赖性，当错觉人脸在人脸之前时，序列效应比相反的更大。综上所述，这些结果支持了人类面部表情和虚幻面部表情的共同机制，并表明表情加工与人类面部特征没有紧密联系。
Facial expressions are vital for social communication, yet the underlying mechanisms are still being discovered. Illusory faces perceived in objects (face pareidolia) are errors of face detection that share some neural mechanisms with human face processing. However, it is unknown whether expression in illusory faces engages the same mechanisms as human faces. Here, using a serial dependence paradigm, we investigated whether illusory and human faces share a common expression mechanism. First, we found that images of face pareidolia are reliably rated for expression, within and between observers, despite varying greatly in visual features. Second, they exhibit positive serial dependence for perceived facial expression, meaning an illusory face (happy or angry) is perceived as more similar in expression to the preceding one, just as seen for human faces. This suggests illusory and human faces engage similar mechanisms of temporal continuity. Third, we found robust cross-domain serial dependence of perceived expression between illusory and human faces when they were interleaved, with serial effects larger when illusory faces preceded human faces than the reverse. Together, the results support a shared mechanism for facial expression between human faces and illusory faces and suggest that expression processing is not tightly bound to human facial features.
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