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面部适应中适应的是什么?人类视觉系统中表情的神经表征。

What is adapted in face adaptation? The neural representations of expression in the human visual system.

作者信息

Fox Christopher J, Barton Jason J S

机构信息

Graduate Program in Neuroscience, University of British Columbia, Vancouver BC, Canada.

出版信息

Brain Res. 2007 Jan 5;1127(1):80-9. doi: 10.1016/j.brainres.2006.09.104. Epub 2006 Nov 15.

Abstract

The neural representation of facial expression within the human visual system is not well defined. Using an adaptation paradigm, we examined aftereffects on expression perception produced by various stimuli. Adapting to a face, which was used to create morphs between two expressions, substantially biased expression perception within the morphed faces away from the adapting expression. This adaptation was not based on low-level image properties, as a different image of the same person displaying that expression produced equally robust aftereffects. Smaller but significant aftereffects were generated by images of different individuals, irrespective of gender. Non-face visual, auditory, or verbal representations of emotion did not generate significant aftereffects. These results suggest that adaptation affects at least two neural representations of expression: one specific to the individual (not the image), and one that represents expression across different facial identities. The identity-independent aftereffect suggests the existence of a 'visual semantic' for facial expression in the human visual system.

摘要

人类视觉系统中面部表情的神经表征尚未明确界定。我们采用适应范式,研究了各种刺激对表情感知产生的后效应。让被试适应一张用于在两种表情之间创建变形的脸,结果发现,这会使变形脸中的表情感知显著偏离适应表情。这种适应并非基于低层次的图像属性,因为同一个人显示该表情的不同图像会产生同样强烈的后效应。不同个体的图像,无论性别如何,都会产生较小但显著的后效应。非面部视觉、听觉或言语的情绪表征不会产生显著的后效应。这些结果表明,适应至少会影响表情的两种神经表征:一种特定于个体(而非图像),另一种则代表不同面部身份的表情。与身份无关的后效应表明,人类视觉系统中存在面部表情的“视觉语义”。

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