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首页> 外文期刊>The European Journal of Neuroscience >Localizing evoked and induced responses to faces using magnetoencephalography
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Localizing evoked and induced responses to faces using magnetoencephalography

机译：使用脑磁图定位诱发的和诱发的面部反应

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摘要

A rich pattern of responses in frequency, time and space are known to be generated in the visual cortex in response to faces. Recently, a number of studies have used magnetoencephalography (MEG) to try to record these responses non-invasively - in many cases using source analysis techniques based on the beamforming method. Here we sought both to characterize best practice for measuring face-specific responses using MEG beamforming, and to determine whether the results produced by the beamformer match evidence from other modalities. We measured activity to visual presentation of face stimuli and phase-scrambled control stimuli, and performed source analyses of both induced and evoked responses using Synthetic Aperture Magnetometry. We localized the gamma-band response to bilateral lateral occipital cortex, and both the gamma-band response and the M170-evoked response to the right fusiform gyrus. Differences in the gamma-band response between faces and scrambled stimuli were confined to the frequency range 50-90 Hz; gamma-band activity at higher frequencies did not differ between the two stimulus categories. We additionally identified a component of the M220-evoked response - localized to the parieto-occipital sulcus - which was enhanced for scrambled vs. unscrambled faces. These findings help to establish that MEG beamforming can localize face-specific responses in time, frequency and space with good accuracy (when validated against established findings from functional magnetic resonance imaging and intracranial recordings), as well as contributing to the establishment of best methodological practice for the use of the beamformer method to measure face-specific responses.
机译：已知响应于面部，在视觉皮层中产生了频率，时间和空间上的丰富响应模式。最近，许多研究已经使用磁脑电图（MEG）尝试无创地记录这些反应-在许多情况下，使用基于波束赋形方法的源分析技术。在这里，我们寻求表征使用MEG波束成形测量面部特定反应的最佳做法，并确定波束成形器产生的结果是否与其他模态的证据相匹配。我们测量了面部刺激和相位混乱控制刺激的视觉表现活动，并使用合成孔径磁强计对诱发和诱发反应进行了源分析。我们对双侧外侧枕叶皮质的伽马带反应进行了本地化，以及伽马带反应和对右梭状回的M170诱发的反应。面部和加扰刺激之间的伽马带响应差异仅限于50-90 Hz;两种刺激类别之间在较高频率下的伽玛带活动没有差异。我们还确定了M220诱发的反应的一个组成部分-定位在顶枕沟-相对于未加扰的面部而言，该成分得到了增强。这些发现有助于确定MEG波束形成可以在时间，频率和空间上以较高的精度定位特定于脸部的响应（当针对功能磁共振成像和颅内记录的确定发现进行验证时），并且有助于建立最佳方法实践使用Beamformer方法来测量特定于面部的响应。

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