Phase locking of β oscillation in electrocorticography (ECoG) in the monkey motor cortex at the onset of EMGs and 3D reaching movements.
Phase locking of β oscillation in electrocorticography (ECoG) in the monkey motor cortex at the onset of EMGs and 3D reaching movements.
复制标题
猴子运动皮层 EMG 和 3D 到达运动开始时皮质电图 (ECoG) 中 β 振荡的锁相。
DOI：
10.1109/embc.2015.7318299
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Tadashi Isa
中科院分区：
文献类型：
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作者：
Hidenori Watanabe;Kazutaka Takahashi;Tadashi Isa
局部场电位、皮质电图（ECoG）和脑电图（EEG）中的β振荡在猴和人类的运动皮层中普遍存在。然而，它们的动力学性质和行为之间的关系还没有得到很好的研究。在这里，我们使用ECoG网格来覆盖大面积的运动皮层和一些体感皮层的猴子，而他们进行了一个不受约束的达到和杠杆拉任务在三维空间与或不走线索。我们使用锁相百分比（PPL）作为β振荡的动力学特性，与行为相关事件、到达起始（RO）、杠杆起始（LO）和保持起始（HO）以及从各种上肢肌肉记录的肌电图（EMG）的多个峰一致。我们发现，PPL与RO和LO的相对强度在有或没有外部围棋线索的情况下都是保留的。此外，在我们记录EMG的肌肉中，β振荡与任何EMG起始点都没有紧密锁相。因此，β振荡的锁相更多地与注意状态和外部线索相关，而不是详细的肌肉活动。
β oscillations in local field potentials, electrocorticography (ECoG), and electroencephalograms (EEG) are ubiquitous in the motor cortex of monkeys and humans. However, relations between their dynamical properties and behavior have not been well studied. Here, we used ECoG grids to cover large areas of motor cortex and some somatosensory cortex in monkeys while they performed an unconstrained reaching and a lever pulling task in three dimensional space with or without go cue. We used percentage of phase locking (PPL) as a dynamical property of β oscillations aligned to behaviorally relevant events, reaching onsets (RO), lever onset (LO), and holding onset (HO) as well as multiple peaks of electromyography (EMG) recorded from various upper limb muscles. We showed that relative strength of PPL alinged to RO and LO were reserved with or without the external go cues. Furthermore, among the muscles that we recorded EMGs from, β oscillations were not closely phase locked to any of EMG onsets. Therefore, phase locking of β oscillations is related more to the attentive state and external cues as opposed to detailed muscle activities.