Neural activation during covert processing of positive emotional facial expressions
Neural activation during covert processing of positive emotional facial expressions
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DOI：
10.1006/nimg.1996.0070
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发表时间：
1996-12-01
期刊：
影响因子：
5.7
通讯作者：
Frith, CD
中科院分区：
文献类型：
--
作者：
Dolan, RJ;Fletcher, P;Frith, CD
损伤研究表明，面部身份和情绪的识别有不同的神经系统。分裂脑实验还表明，对刺激的情绪评估可以在没有意识识别的情况下发生。本研究检验了一种假设，即与情绪面孔相比，情绪面孔与非情绪面孔的不同神经反应独立于外显意识调节，实验范式涉及记住一张跨越45-S延迟的面孔的图像，同时使用正电子发射断层扫描测量局部脑血流量。在延迟之前，向一张单独的面孔呈现明确的指令，使其与在延迟结束时呈现的两张面孔中的一张相匹配，该面孔与目标面孔的不同角度拍摄，当受试者在脑海中保持快乐或中性面孔时，或在没有初始面孔呈现的中性控制注视条件下，重复的血流测量结果表明，与无情绪或注视条件相比，延迟时间内情绪面孔的呈现与左侧腹前额叶皮质、左侧扣带前皮质和右侧梭形回的显著激活有关，该发现支持我们的假说，即在涉及面部和情绪加工的区域，对面部情绪的不同神经反应独立于意识调节。(C)1996年学术出版社。
Lesion studies indicate distinct neural systems for recognition of facial identity and emotion. Split-brain experiments also suggest that emotional evaluation of a stimulus can occur without conscious identification, The present study tested a hypothesis of a differential neural response, independent of explicit conscious mediation, to emotional compared to nonemotional faces, The experimental paradigm involved holding in mind an image of a face across a 45-s delay while regional cerebral blood flow was measured using positron emission tomography, Prior to the delay, a single face was presented with an explicit instruction to match it to one of two faces, photographed at different angles from the target face, presented at the end of the delay, Repeated blood flow measures were obtained while subjects held happy or neutral faces in mind or during a neutral control fixation condition without initial face presentation, The representation of emotional faces over a delay period, compared to either the nonemotional or the fixation condition, was associated with significant activation in the left ventral prefrontal cortex, the left anterior cingulate cortex, and the right fusiform gyrus, The findings support our hypothesis of a differential neural response to facial emotion, independent of conscious mediation, in regions implicated in the processing of faces and of emotions. (C) 1996 Academic Press, Inc.