LaBar Kevin S, Crupain Michael J, Voyvodic James T, McCarthy Gregory
Center for Cognitive Neuroscience and Brain Imaging and Analysis Center, Duke University, Durham, NC 27708, USA.
Cereb Cortex. 2003 Oct;13(10):1023-33. doi: 10.1093/cercor/13.10.1023.
Functional magnetic resonance imaging (fMRI) was used to compare brain activation to static facial displays versus dynamic changes in facial identity or emotional expression. Static images depicted prototypical fearful, angry and neutral expressions. Identity morphs depicted identity changes from one person to another, always with neutral expressions. Emotion morphs depicted expression changes from neutral to fear or anger, creating the illusion that the actor was 'getting scared' or 'getting angry' in real-time. Brain regions implicated in processing facial affect, including the amygdala and fusiform gyrus, showed greater responses to dynamic versus static emotional expressions, especially for fear. Identity morphs activated a dorsal fronto-cingulo-parietal circuit and additional ventral areas, including the amygdala, that also responded to the emotion morphs. Activity in the superior temporal sulcus discriminated emotion morphs from identity morphs, extending its known role in processing biologically relevant motion. The results highlight the importance of temporal cues in the neural coding of facial displays.
功能磁共振成像（fMRI）被用于比较大脑对静态面部表情与面部身份或情感表达的动态变化的激活情况。静态图像描绘了典型的恐惧、愤怒和中性表情。身份变形图像描绘了从一个人到另一个人的身份变化，始终带有中性表情。情感变形图像描绘了从中性到恐惧或愤怒的表情变化，营造出演员正在实时“受到惊吓”或“变得愤怒”的错觉。涉及处理面部情感的脑区，包括杏仁核和梭状回，对动态情感表达的反应比对静态情感表达的反应更强烈，尤其是对于恐惧。身份变形激活了一个背侧额-扣带-顶叶回路以及包括杏仁核在内的额外腹侧区域，这些区域对情感变形也有反应。颞上沟的活动将情感变形与身份变形区分开来，扩展了其在处理生物相关运动方面的已知作用。结果突出了时间线索在面部表情神经编码中的重要性。
