The Relationship of Gamma Oscillations and Face-Specific ERPs Recorded Subdurally from Occipitotemporal Cortex
The Relationship of Gamma Oscillations and Face-Specific ERPs Recorded Subdurally from Occipitotemporal Cortex
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DOI：
10.1093/cercor/bhq206
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发表时间：
2011-05-01
期刊：
影响因子：
3.7
通讯作者：
McCarthy, Gregory
中科院分区：
文献类型：
--
作者：
Engell, Andrew D.;McCarthy, Gregory
面孔的感知引起了人梭状回和邻近胸枕皮质位点的离散基因座的特征电生理反应。这些反应中突出的是与200 ms postet（face-n200）相似的表面阴性潜力和伽马频带（face-gamma eRSP）的面部诱导的光谱扰动。这些响应代表同一皮质基因座的活性及其受相同感知和任务变量影响的程度尚不清楚。我们在2个实验中评估了这一解剖共定位和功能相关性，其中51名参与者的硬膜下电极记录了皮质图。实验1研究了伽马ERSP的类别特异性及其与face-n200的共定位。实验2检查了face-n200和face-gamma erersp的差异，以面对特征复杂性各不相同的刺激。我们发现，伽马ERSP是一种特定类别的现象，具有单独的，但重叠的类别敏感性为N200。此外，在电极位点存在脸部脉冲ERSP，可以显着预测该位点face-n200的振幅。但是，相反的情况并非如此，因为那个面部N200是由没有诱发脸部粉丝eRSP的贫困面部刺激引起的。这些结果表明，这些电生理反应反映了大脑面部处理系统的单独组成部分。
The perception of faces evokes characteristic electrophysiological responses at discrete loci in human fusiform gyrus and adjacent ventral occipitotemporal cortical sites. Prominent among these responses are a surface-negative potential at similar to 200-ms postonset (face-N200) and face-induced spectral perturbations in the gamma band (face-gamma ERSP). The degree to which these responses represent activity in the same cortical loci and the degree to which they are influenced by the same perceptual and task variables are unknown. We evaluated this anatomical colocalization and functional correlation in 2 experiments in which the electrocorticogram was recorded from subdural electrodes in 51 participants. Experiment 1 investigated the category specificity of the gamma ERSP and its colocalization with the face-N200. Experiment 2 examined differences in face-N200 and face-gamma ERSP to face stimuli that varied in featural complexity. We found that gamma ERSP is a category-specific phenomenon with separate, though overlapping, category sensitivities as the N200. Further, the presence of face-gamma ERSP at an electrode site significantly predicted the presence and amplitude of face-N200 at that site. However, the converse was not true in that face-N200 was evoked by impoverished face stimuli that did not induce face-gamma ERSP. These results demonstrate that these electrophysiological responses reflect separate components of the brain's face processing system.