语言范畴影响面部表情知觉的电生理学证据

Electrophysiological Evidence for the Lateralized Effect of Lexical Categories on Perception of Facial Expression

本研究探讨了语言范畴影响面部表情知觉的时程及大脑偏侧化特点。采用从快乐到恐惧渐变的4张人类面孔表情图片为实验材料,以分视野呈现刺激的oddball范式设计脑电实验,并以分心任务使被试不注意实验表情图片之间的差异。实验结果显示,表情知觉诱发的ERP成分N1和N2上均出现了偏右视野-左脑表情范畴知觉,即在右视野呈现的条件下,范畴间偏差刺激比范畴内偏差刺激诱发了更大的vMMN效应,而在左视野呈现的条件下,两类偏差刺激诱发的vMMN效应无显著差异。这一结果表明表情范畴知觉发生在表情知觉的早期感觉水平加工及后知觉加工阶段,且具有偏右视野-左脑特性,提示语言范畴会同时影响早期、注意前表情知觉及后知觉加工,支持了沃尔夫假说。

The current study investigated whether lexical category affects facial expression perception at early,preattentive perceptual processing stage and whether this effect lateralizes to the left hemisphere of the brain.In an ERP study,four gradual facial expression images,including H1,H2,F1 and F2 were used.The expressions of H1 and H2 were happiness,while those of F1 and F2 were fear.Participants were asked to complete a visual oddball task,in which standard and deviant facial expression images from the same or different lexical categories were presented and a facial image displayed angry was presented as an attention-capturing target stimuli.ERPs showed that,in both the time windows of N1 and N2,amplitude of the vMMN evoked by the between-category deviant was larger than that evoked by the within-category deviant when displayed in the right visual field,but no such effect was observed when stimuli were presented in the left visual field.These results suggested that lexical category affects the perception of facial expression at both early,preattentive perceptual processing stages and post-perceptual decision/response phases,and the effect of lexical category on facial expression perception lateralizes to the left hemisphere of the brain.