Experience-dependent coding of facial expression in superior temporal sulcus

被引:65
作者
Furl, Nicholas
van Rijsbergen, Nicola J.
Treves, Alessandro
Friston, Karl J.
Dolan, Raymond J.
机构
[1] UCL, Inst Neurol, Wellcome Trust Ctr Neuroimaging, London WC1N 3BG, England
[2] Scuola Int Super Studi Avanzati, Cognit Neurosci Sector, I-34104 Trieste, Italy
基金
英国惠康基金;
关键词
hierarchical bayes; magnetoencephalography; predictive coding; top-down processing; visual evoked fields;
D O I
10.1073/pnas.0702548104
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Sensory information from the external world is inherently ambiguous, necessitating prior experience as a constraint on perception. Prolonged experience (adaptation) induces perception of ambiguous morph faces as a category different from the adapted category, suggesting sensitivity in underlying neural codes to differences between input and recent experience. Using magnetoencephalography, we investigated the neural dynamics of such experience-dependent visual coding by focusing on the timing of responses to morphs after facial expression adaptation. We show that evoked fields arising from the superior temporal sulcus (STS) reflect the degree to which a morph and adapted expression deviate. Furthermore, adaptation effects within STS predict the magnitude of behavioral aftereffects. These findings show that the STS codes expressions relative to recent experience rather than absolutely and may bias perception of expressions. One potential neural mechanism for the late timing of both effects appeals to hierarchical models that ascribe a central role to backward connections in mediating predictive codes.
引用
收藏
页码:13485 / 13489
页数:5
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