参考电极对面孔识别事件相关电位成分的影响

Influence of reference electrode on face recognition event-related potential components

背景:选择脑电图参考电极方式是分析事件相关电位的关键步骤,但是参考电极事件相关电位成分影响的相关研究较少。目的:从统计学和头皮电位拓扑学角度比较分析了平均参考、左耳乳突参考和零参考对面孔识别事件相关电位成分的影响。方法:使用的脑电图数据来自国际公开数据库OpenfMRI中的多模态人类神经影像数据集。招募了19名正常或矫正视力正常的健康者进行视觉刺激试验,试验的视觉刺激因子分别为陌生人脸和扰乱人脸。使用brainstorm软件对3种参考(平均参考、左耳参考、零参考)方式下,在枕颞叶区域采集到的事件相关电位,进行N170潜伏期和幅值分析,并进行头皮电位拓扑图和源定位计算,对3种参考下的实验结果进行对比分析。结果与结论:①与扰乱人脸相比,陌生人脸诱发的事件相关电位N170有更短的潜伏期和更大N170幅值的特点,N170潜伏期没有显著性差异,N170幅值有显著性差异;②拓扑结果表明,在相同的刺激因子下大脑右侧颞叶比左侧枕叶活动更为强烈,且只有REST参考能够最好地揭示大脑右侧颞叶和前额叶区域在陌生人脸和扰乱人脸刺激时存在显著性差异;③结果说明,REST参考方式下得到的脑电图数据更加真实准确,这为进一步研究面孔识别神经机制提供了帮助,为面孔识别相关实验参考电极的选择提供依据。

BACKGROUND: Selecting the electroencephalograph reference electrode is a key step in the analysis of event-related potential, but there are few studies on the influence of reference electrode event-related potential components. OBJECTIVE: To compare and analyze the effects of mean reference, left ear papillary reference and zero reference on face recognition event-related potential components were analyzed from the perspectives of statistics and scalp potential topology. METHODS: The electroencephalograph data were from the multimodal human neuroimaging dataset in the Open f MRI database. Nineteen normal or normal corrected vision volunteers underwent visual stimulation test, and the visual stimulation factors were strange and disrupt faces. The latency and amplitude of N170 under three references(mean reference, left ear papillary reference and zero reference) was analyzed. The brainstorm potential topology and source localization calculation were performed using brainstorm software. Finally, the experimental results under the three references were compared and analyzed. RESULTS AND CONCLUSION:(1) Compared with disturbing the face, the strange face-induced event-related potential N170 had a shorter latency and larger N170 amplitude. There was no significant difference in the N170 latency, and the N170 amplitude has a significant difference.(2) Topological results indicated that the right temporal lobe of the brain was more intense than the left occipital lobe under the same stimuli, and only the REST reference could best reveal the right temporal and prefrontal regions of the brain in strange faces and disturbing people. There is a significant difference in face stimulation.(3) These results show that the electroencephalograph data obtained by REST reference is more realistic and accurate, which helps us to further study the neural mechanism of face recognition, and provides a basis for the selection of experimental reference electrodes for face recognition.