The face-sensitive N170 and VPP components manifest the same brain processes: The effect of reference electrode site
The face-sensitive N170 and VPP components manifest the same brain processes: The effect of reference electrode site
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DOI：
10.1016/j.clinph.2005.07.005
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发表时间：
2005-11-01
影响因子：
4.7
通讯作者：
Rossion, B
中科院分区：
文献类型：
--
作者：
Joyce, C;Rossion, B
目的：（1）探讨面孔加工文献中报道的顶点正电位（VPP）和N170 ERP成分是同一脑过程的两种表现形式，其相对幅度依赖于参考电极的假设;（2）调查是否存在面子/在研究VPP和N170的研究中报告的目标结果可归因于参考位置。方法：脑电图记录从53头皮电极在线参考左乳突，而受试者看到的脸，汽车和文字刺激。离线时，将数据系统地重新引用到共同平均值、平均乳突、平均耳垂、非头部和鼻部。结果：（1）N170和VPP的振幅在参考电极上呈精确的反向变化;（2）对于所有参比电极，N170和VPP的峰值在时间上一致，（3）这两个分量可以由相同的偶极配置来解释，结论：VPP和N170是同一个脑发生器的两个“面孔”，在ERP研究中观察到的N170/VPP效应的差异可以用参考方法的差异来解释。(c)2005年国际临床神经生理学联合会。由Elsevier爱尔兰有限公司出版。保留所有权利。
Objective: (1) To investigate the hypothesis that the vertex positive potential (VPP) and the N170 ERP components reported in the face processing literature are two manifestations of the same brain processes whose relative amplitude in a given experiment is dependent on reference electrode; (2) to investigate whether differences in face/object results reported in studies looking at the VPP and N170 are attributable to the location of reference.Methods: EEG was recorded from 53 scalp electrodes referenced online to the left mastoid while subjects viewed face, car and word stimuli. Off-line, the data were systematically re-referenced to the common average, averaged mastoids, averaged earlobes, non-cephalic, and nose. The correlation of timing, amplitude, and effects was investigated across reference electrodes.Results: (1) The amplitude of the N170 and VPP components varies in a precisely inverse manner across reference; (2) the peaks of the N170 and VPP are temporally coincident for all reference electrodes, (3) both components can be accounted for by the same dipolar configuration, and (4) the components show identical functional properties.Conclusions: The VPP and N170 are two 'faces' of the same brain generators.Significance: The differential N170/VPP effects observed in ERP studies can be accounted for by differences in reference methodology. (c) 2005 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.