Responses in the right posterior superior temporal sulcus show a feature-based response to facial expression
Responses in the right posterior superior temporal sulcus show a feature-based response to facial expression
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DOI：
10.1016/j.cortex.2015.03.002
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发表时间：
2015-08-01
期刊：
影响因子：
3.6
通讯作者：
Young, Andrew W.
中科院分区：
文献类型：
--
作者：
Flack, Tessa R.;Andrews, Timothy J.;Young, Andrew W.
右侧颞后上沟（pSTS）的面部选择区在面部表情分析中起重要作用。然而，面部表情在这一区域的表现方式尚不清楚。在这项研究中，我们使用人脸合成效应来探索pSTS是否包含面部表情的整体或基于特征的表征。从摆出不同表情的脸的上半部分和下半部分创建对齐和不对齐的合成图像。在实验1中，参与者执行了一项行为匹配任务，即判断两张图片的上半部分是相同的还是不同的。当图像对齐时，识别上半部分人脸的能力会受到下半部分人脸变化的影响，而当图像不对齐时则不会。这显示了对表达的整体行为反应。在实验2中，我们使用fmr - adaptive来探究pSTS是否具有相应的表达整体神经表征。对齐或不对齐的图像在包含重复图像或图像的上半部分或下半部分变化的块中呈现。无论变化发生在图像的顶部还是底部，右侧pSTS都发现神经反应增加，这表明面部的所有部位都检测到表情的变化。然而，与行为数据相反，这种模式在对齐和不对齐的刺激之间没有差异。这表明pSTS并没有对面部表情进行整体编码。与pSTS相比，在右侧额下回（IFG）中发现了对面部表情的整体反应模式。总之，这些结果表明，pSTS反映了面部表情加工的早期阶段，在这个阶段，面部特征是独立表征的。(C) 2015 Elsevier Ltd.版权所有。
The face-selective region of the right posterior superior temporal sulcus (pSTS) plays an important role in analysing facial expressions. However, it is less clear how facial expressions are represented in this region. In this study, we used the face composite effect to explore whether the pSTS contains a holistic or feature-based representation of facial expression. Aligned and misaligned composite images were created from the top and bottom halves of faces posing different expressions. In Experiment 1, participants performed a behavioural matching task in which they judged whether the top half of two images was the same or different. The ability to discriminate the top half of the face was affected by changes in the bottom half of the face when the images were aligned, but not when they were misaligned. This shows a holistic behavioural response to expression. In Experiment 2, we used fMR-adaptation to ask whether the pSTS has a corresponding holistic neural representation of expression. Aligned or misaligned images were presented in blocks that involved repeating the same image or in which the top or bottom half of the images changed. Increased neural responses were found in the right pSTS regardless of whether the change occurred in the top or bottom of the image, showing that changes in expression were detected across all parts of the face. However, in contrast to the behavioural data, the pattern did not differ between aligned and misaligned stimuli. This suggests that the pSTS does not encode facial expressions holistically. In contrast to the pSTS, a holistic pattern of response to facial expression was found in the right inferior frontal gyrus (IFG). Together, these results suggest that pSTS reflects an early stage in the processing of facial expression in which facial features are represented independently. (C) 2015 Elsevier Ltd. All rights reserved.