【摘要】 利用ERP技术对16名被试在不同注意负荷下对动态表情识别的脑时程特点进行了考察,结果发现:N170成分不受注意负荷和表情效价影响;低注意负荷条件下动态表情加工早期负性表情诱发的EPN成分(early posterior negativity)显著大于中性、正性表情,后期高级分析阶段正、负性表情均诱发明显的LPP成分(late positive potentials),且负性较正性表情诱发更大的LPP成分;而在高注意负荷条件下并未发现表情识别诱发明显的EPN或LPP成分。这些结果说明,动态表情识别明显受到注意资源调节,只有在注意资源不断增加时表情加工才会出现注意偏向效应,尤以负性表情的加工优势最为凸显且持久,正性表情相对微弱和短暂。更多还原

【Abstract】 An ERP technique was used to investigate the time course of processing three dynamic facial emotional expressions( happy,neutral and fearful faces) under two different attentional conditions. A total of 16 subjects who were all undergraduate students participated in the current experiment. Results showed that( 1) The N170 component was significantly elicited on occipito-temporal cortex during 150 ~ 200 ms after stimulus onset and not affected by both dynamic facial emotional content and attention resource.( 2)An enhanced EPN potential was elicited by fearful faces in comparison to dynamic happy and neutral faces under low attention load condition but no any significant interaction effect was detected.( 3) The LPP( late positive potentials) appeared during 320~ 800 ms after stimulus onset. The research showed that only under the low attention load condition did exist LPP amplitude’s difference of the three facial expressions varying time course. Taken together,these results demonstrated that the processing of dynamic facial emotional expressions were highly modulated by attention resources,indicating that only the adequate attention resource could induce attention bias to assure emotional perception and elaborating analysis更多还原