【作者】 张畅芯； 陆灵犀； 曹舒扬； 李华辉； 吴玺宏； 李量；

【Author】 Zhang Changxin Lu Lingxi Li Huahui Cao Shuyang Wu Xihong Li Liang Department of Psychology,Key Laboratory on Machine Perception(Ministry of Education), Peking University,Beijing 100871,China,

【机构】 北京大学心理学系、机器感知与智能重点实验室(教育部)；

【摘要】 本研究由两个实验组成,探讨模糊客体(面孔、房子)诱发的面孔特异成分N170的性质。实验一采用恒定刺激法测量得出了个体对于模糊的面孔、房子、树木、汽车的主观探测阈限,并发现面孔的主观探测阈限显著低于房子、树木和汽车,这一结果说明人在有遮挡的环境下对人脸的觉察能力要显著地高于对其它客体的觉察能力。实验二采用事件相关电位(ERPs)的方法研究模糊客体(面孔、房子)诱发的N170的性质,结果显示,随着模糊度的增加,面孔诱发N170的振幅减小,潜伏期增大;当模糊程度在主观探测阈限之上时,面孔诱发的N170仍然显著大于房子,当模糊程度在主观探测阈限之下时,面孔和房子诱发的N170没有显著差别。更多还原

【Abstract】 Two experiments were conducted to investigate the properties of N170 evoked by obscure objects(faces and houses).In Experiment 1,the subjective detecting thresholds of obscure faces,houses,tress,and cars were measured via the method of constant stimuli.The results showed that the subjective detecting thresholds of faces were significantly higher than that of houses,trees,and cars.This indicated that human have much higher ability to detecting faces than other objects under obscure circumstances.In Experiment 2,the method of event-related potentials(ERPs) was used to study the properties of N170 evoked by obscure objects (faces and houses).The results showed that as the obscurity degree increased,the amplitudes of N170 evoked by faces decreased, and the latencies of that increased;when the degree of obscurity was above the subjective detecting threshold,N170 evoked by faces were significantly larger than evoked by houses,while when the degree of obscurity was below the subjective detecting threshold, there was no significant differences between N170 evoked by faces and houses.更多还原