Cortical responses to invisible faces: Dissociating subsystems for facial-information processing
Cortical responses to invisible faces: Dissociating subsystems for facial-information processing
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DOI：
10.1016/j.cub.2006.08.084
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发表时间：
2006-10-24
期刊：
影响因子：
9.2
通讯作者：
He, Sheng
中科院分区：
文献类型：
--
作者：
Jiang, Yi;He, Sheng
感知面孔对社会互动至关重要。有证据表明，不同的神经通路可能负责处理面部识别和表情信息。通过功能性磁共振成像（fMRI），我们测量了当观察者看到中性、恐惧和混乱的面孔时的大脑反应，这些面孔要么是可见的，要么是通过眼间抑制而变得不可见的。右侧梭状回面部区（FFA）、右侧颞上沟（STS）和杏仁核对可见面孔反应强烈。然而，当人脸图像变得不可见时，中性和恐惧面孔的FFA活动都大大减少，尽管仍然可以测量；STS的活动只对看不见的恐惧面孔有强烈的反应，而对中性面孔没有。对于恐惧的面孔，在可见和不可见条件下，杏仁核的活动同样强烈，但对于中性的面孔，在不可见条件下，杏仁核的活动要弱得多。在隐形条件下，杏仁核活动与STS高度相关，而与FFA不相关。在不可见条件下的结果支持可分离神经系统的存在，专门用于处理面部身份和表情信息。当图像不可见时，皮层反应可能主要反映前馈视觉信息处理，从而使我们能够揭示FFA和STS的不同功能。
Perceiving faces is critical for social interaction. Evidence suggests that different neural pathways may be responsible for processing face identity and expression information. By using functional magnetic resonance imaging (fMRI), we measured brain responses when observers viewed neutral, fearful, and scrambled faces, either visible or rendered invisible through interocular suppression. The right fusiform face area (FFA), the right superior temporal sulcus (STS), and the amygdala responded strongly to visible faces. However, when face images became invisible, activity in FFA to both neutral and fearful faces was much reduced, although still measurable; activity in the STS was robust only to invisible fearful faces but not to neutral faces. Activity in the amygdala was equally strong in both the visible and invisible conditions to fearful faces but much weaker in the invisible condition for the neutral faces. In the invisible condition, amygdala activity was highly correlated with that of the STS but not with FFA. The results in the invisible condition support the existence of dissociable neural systems specialized for processing facial identity and expression information. When images are invisible, cortical responses may reflect primarily feedforward visual-information processing and thus allow us to reveal the distinct functions of FFA and STS.