The correlates of subjective perception of identity and expression in the face network: an fMRI adaptation study.
The correlates of subjective perception of identity and expression in the face network: an fMRI adaptation study.
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DOI：
10.1016/j.neuroimage.2008.09.011
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发表时间：
2009-01-15
期刊：
影响因子：
5.7
通讯作者：
Barton JJ
中科院分区：
文献类型：
--
作者：
Fox CJ;Moon SY;Iaria G;Barton JJ
面部身份和表情的识别是不同的任务，目前的模型假设面部处理网络内的处理解剖隔离。使用功能磁共振成像适应和感兴趣区域方法，我们评估了变形刺激中身份和表达变化的感知如何影响该网络中的信号，通过对比（a）跨越身份或表达的分类边界的变化与那些没有的变化，以及（B）受试者感知为导致身份或表达变化的变化，与他们认为不影响身份或表达类别的变化相比。枕面部区域（OFA）对面部的任何结构变化都很敏感，无论是身份还是表情，但其信号与受试者是否感知到变化无关。无论是梭状面区（FFA）和后上级颞沟（pSTS）显示从适应释放时，受试者认为无论是身份或表达的变化，虽然在pSTS这种效果只发生在受试者明确出席表达。颞中上级沟（mSTS）仅表现为适应性释放，楔前叶仅表现为身份。这些数据支持OFA参与面部结构早期感知的模型。然而，FFA和pSTS的功能重叠的证据，在这两个领域的身份和表达信号，反对一个完全独立的身份和表达处理在这些地区的核心面处理网络。
The recognition of facial identity and expression are distinct tasks, with current models hypothesizing anatomic segregation of processing within a face-processing network. Using fMRI adaptation and a region-of-interest approach, we assessed how the perception of identity and expression changes in morphed stimuli affected the signal within this network, by contrasting (a) changes that crossed categorical boundaries of identity or expression with those that did not, and (b) changes that subjects perceived as causing identity or expression to change, versus changes that they perceived as not affecting the category of identity or expression. The occipital face area (OFA) was sensitive to any structural change in a face, whether it was identity or expression, but its signal did not correlate with whether subjects perceived a change or not. Both the fusiform face area (FFA) and the posterior superior temporal sulcus (pSTS) showed release from adaptation when subjects perceived a change in either identity or expression, although in the pSTS this effect only occurred when subjects were explicitly attending to expression. The middle superior temporal sulcus (mSTS) showed release from adaptation for expression only, and the precuneus for identity only. The data support models where the OFA is involved in the early perception of facial structure. However, evidence for a functional overlap in the FFA and pSTS, with both identity and expression signals in both areas, argues against a complete independence of identity and expression processing in these regions of the core face-processing network.
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