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首页> 外文期刊>Brain topography >Saccade related gamma-band activity in intracerebral EEG: dissociating neural from ocular muscle activity.
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Saccade related gamma-band activity in intracerebral EEG: dissociating neural from ocular muscle activity.

机译：大脑脑电图中与扫视有关的伽马带活动：使神经与眼肌活动分离。

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摘要

Recent evidence suggests that transient increases in scalp electroencephalography (EEG) gamma band power (above 30 Hz) can be due to miniature eye movements. Although, these findings do not raise doubts about the widely established role of gamma range neural synchrony, it does call for caution when it comes to interpreting high frequency scalp EEG data. By contrast, gamma-band activity detected with intracerebral EEG (iEEG) is assumed to be immune to such miniature saccade artefacts. Here, we show for the first time, that while this is indeed largely the case, intracerebral recordings in the temporal pole of implanted patients can be contaminated by saccadic eye muscle artefacts resulting in typical high gamma-band power increases. By analyzing data from multiple depth electrodes, we show that this artefact is confined to the pole of the temporal lobe because of its immediate vicinity to extraocular muscles (rectus lateralis). For other brain structures, our analysis shows that the use of stereotactic EEG with a bipolar montage provides a robust and convenient tool to explore the functional role of gamma synchronization in humans with high anatomical accuracy during a wide range of cognitive processes, including oculomotor behaviour.
机译：最近的证据表明，头皮脑电图（EEG）伽马波段功率（30 Hz以上）的短暂增加可能是由于眼球的微小运动所致。尽管这些发现并未引起人们对伽玛范围神经同步性广泛作用的怀疑，但在解释高频头皮EEG数据时确实需要谨慎。相比之下，用脑内脑电图（iEEG）检测到的伽马带活动被认为对这种小型扫视伪像是免疫的。在这里，我们首次表明，尽管确实如此，但植入患者颞极的脑内记录可能会被眼跳的伪影污染，从而导致典型的高伽马波段功率增加。通过分析来自多个深度电极的数据，我们发现该假象局限于颞叶的极点，因为它紧邻眼外肌（外侧直肌）。对于其他大脑结构，我们的分析表明，将立体定向脑电图与双极蒙太奇结合使用可提供强大而方便的工具，以广泛的认知过程（包括动眼行为）在人类中以较高的解剖学准确性探索伽马同步在人类中的功能作用。

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