Cortical substrates for the perception of face actions: an fMRI study of the specificity of activation for seen speech and for meaningless lower-face acts (gurning)
Cortical substrates for the perception of face actions: an fMRI study of the specificity of activation for seen speech and for meaningless lower-face acts (gurning)
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DOI：
10.1016/s0926-6410(01)00054-4
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发表时间：
2001-10-01
期刊：
影响因子：
--
通讯作者：
David, AS
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文献类型：
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作者：
Campbell, R;MacSweeney, M;David, AS
当面部动作的表面视觉质量非常相似时，面部动作感知的皮层底物能被区分出来吗？本文报道了两个功能磁共振实验。与观察静止的面部相比，观察沉默言语与双侧颞皮质区域的激活有关，包括颞上沟（STS）。观看程度和持续时间相似但不能被解释为说话的面部运动（转向；实验lb）与颞上皮层的激活程度不相关，尤其是在左半球。相反，最大的激活簇的峰值焦点在颞下回的后部（右，BA 37）。观察沉默的言语，而不是转动的脸，也与双侧额叶下皮层的激活有关（ba44和ba45）。在第二项研究中，在一个单独的实验中，使用由说话者的脸和躯干组成的刺激（因此，说话者的脸和面部动作的图像要小得多），对朗读和观察转动的脸进行了比较。在实验1的基础上，再次出现了颞上皮层的差异接合。这些发现表明，当受试者在不同的尺度上看到可以被解释为语言的面部动作时，颞上回和邻近区域被双侧激活。视觉上相似，但语言上无意义的动作不能达到同样的程度。然而，一些颞区，如右侧颞上沟的后部，似乎是处理视觉语言和转动的共同加工部位。(C) 2001 Elsevier Science版权所有
Can the cortical substrates for the perception of face actions be distinguished when the superficial visual qualities of these actions are very similar? Two fMRI experiments are reported. Compared with watching the face at rest, observing silent speech was associated with bilateral activation in a number of temporal cortical regions, including the superior temporal sulcus (STS). Watching face movements of similar extent and duration, but which could not be construed as speech (gurning; Experiment lb) was not associated with activation of superior temporal cortex to the same extent, especially in the left hemisphere. Instead, the peak focus of the largest cluster of activation was in the posterior part of the inferior temporal gyrus (right, BA 37). Observing silent speech, but not gurning faces, was also associated with bilateral activation of inferior frontal cortex (BA 44 and 45). In a second study, speechreading and observing gurning faces were compared within a single experiment, using stimuli which comprised the speaker's face and torso (and hence a much smaller image of the speaker's face and facial actions). There was again differential engagement of superior temporal cortex which followed the pattern of Experiment 1. These findings suggest that superior temporal gyrus and neighbouring regions are activated bilaterally when subjects view face actions - at different scales - that can be interpreted as speech. This circuitry is not accessed to the same extent by visually similar, but linguistically meaningless actions. However, some temporal regions, such as the posterior part of the right superior temporal sulcus, appear to be common processing sites for processing both seen speech and gurns. (C) 2001 Elsevier Science BY All rights reserved.