A magnetoencephalographic study of face processing: M170, gamma-band oscillations and source localization.
A magnetoencephalographic study of face processing: M170, gamma-band oscillations and source localization.
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DOI：
10.1002/hbm.22028
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发表时间：
2013-08
影响因子：
4.8
通讯作者：
Bentin, Shlomo
中科院分区：
文献类型：
--
作者：
Gao, Zaifeng;Goldstein, Abraham;Harpaz, Yuval;Hansel, Myriam;Zion-Golumbic, Elana;Bentin, Shlomo
脑电研究表明，N170 ERP和伽玛波段反应的面孔反映了早期和后期的多层次的面孔知觉机制，分别。然而，这些结论应谨慎考虑，因为EEG记录的伽马可能会受到非头部活动（如微扫视）的污染。此外，伽马的EEG研究不能轻易揭示其颅内来源。在这里，我们记录了MEG而不是EEG，使用波束形成器评估了M170和Gamma振荡的来源，并探讨了这些神经表现对面部中的全局、特征和特征信息的敏感性。M170对面部和面部组件的响应大于对手表的响应。即使没有面部轮廓，也会扰乱面部内部组件的配置，从而减少和延迟M170。MEG伽马振荡（30-70 Hz）的振幅高于基线在230-570 ms之间的刺激开始的时期，是特别敏感的刺激的配置，无论其类别。然而，在该频率范围的较低部分（30-40 Hz）中，仅外貌刺激使MEG高于基线。M170和Gamma都是在后腹侧网络中产生的，包括梭状回、枕叶前回和舌回，所有这些都在右半球。伽马的产生涉及视觉系统中的额外来源，双侧。我们认为，诱发的M170体现了一种基于面孔的整体特征的面孔知觉机制，而诱发的Gamma振荡与视觉输入整合到一个预先存在的连贯的知觉表征。
EEG studies suggested that the N170 ERP and Gamma-band responses to faces reflect early and later stages of a multiple-level face-perception mechanism, respectively. However, these conclusions should be considered cautiously because EEG-recorded Gamma may be contaminated by non-cephalic activity such as microsaccades. Moreover, EEG studies of Gamma cannot easily reveal its intracranial sources. Here we recorded MEG rather than EEG, assessed the sources of the M170 and Gamma oscillations using beamformer, and explored the sensitivity of these neural manifestations to global, featural and configural information in faces. The M170 was larger in response to faces and face components than in response to watches. Scrambling the configuration of the inner components of the face even if presented without the face contour reduced and delayed the M170. The amplitude of MEG Gamma oscillations (30–70 Hz) was higher than baseline during an epoch between 230–570 ms from stimulus onset and was particularly sensitive to the configuration of the stimuli, regardless of their category. However, in the lower part of this frequency range (30–40 Hz) only physiognomic stimuli elevated the MEG above baseline. Both the M170 and Gamma were generated in a posterior-ventral network including the fusiform, inferior-occipital and lingual gyri, all in the right hemisphere. The generation of Gamma involved additional sources in the visual system, bilaterally. We suggest that the evoked M170 manifests a face-perception mechanism based on the global characteristics of face, whereas the induced Gamma oscillations are associated with the integration of visual input into a pre-existent coherent perceptual representation.
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