面孔表情加工的结构编码和特征编码ERP特点研究

doi:10.3969/j.issn.0258-8021.2015.02.002

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Abstract The eventrelated potentials (ERP) technique was used to analyze the early and late characteristics of facial expressions processing, to investigate the mechanisms underlying structure encoding and feature encoding. Three kinds of cartoon facial expressions (neutral, happy, angry) and three kinds of nonfacial cartoons were presented randomly, 14 volunteers were instructed to implement face and facial expression recognition tasks. Electroencephalography (EEG) was record with Neuroscan-64 cap. We analyzed the early component N170 and the late positive component (LPC) evoked by faces, nonfaces, and different emotional faces. Results indicated that there were significant differences between N170 evoked by facial cartoons and that evoked by nonfacial cartoons. The amplitudes of N170 at P7 evoked by facial cartoons and nonfacial cartoons were (-915±147) μV and (-691±121) μV. There were not significant differences among N170 evoked by different emotional faces, N170 was not regulated by facial emotion content. Expressional effects appeared at 350～550 ms after stimulus, there were significant differences among LPC evoked by different emotional faces. The amplitudes of LPC at CZ evoked by neutral, happy and angry facial expressions were (611±179)μV, (749±131) μV and (989±177)μV, respectively. These results suggest that early and late processing mechanisms of face recognition are different, the early component N170 reflects the processing of face structure encoding, so called the characterization of the whole face contour; while face emotional processing is mainly reflected in the late component, LPC reflects mechanism of face feature encoding.

Key words： eventrelated potential (ERP) face recognition structure encoding feature encoding

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	Ji Shumei*Liu Yafei Yuan Dongmei

Cite this article:

Ji Shumei*Liu Yafei Yuan Dongmei. Studies on Characteristics of ERP Underlying Structure Encoding and Feature Encoding of Facial Expressions[J]. journal1, 2015, 34(2): 136-142.

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http://cjbme.csbme.org/EN/10.3969/j.issn.0258-8021.2015.02.002 OR http://cjbme.csbme.org/EN/Y2015/V34/I2/136

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