Sensitivity to tactile stimuli is an indispensable feedback in human motion control. However, previous studies on tactile stimulation mainly focused on the effects of superficial tactile stimulation on the motor cortex, but the role of deep tactile feedback stimulation in motor tasks is not clear. Corticomuscular coherence (CMC) is an effective method for studying dynamic motion tasks. Recent evidence suggests that CMC is enhanced by tactile stimulation in the beta-band. But, the mechanism of tactile stimulation in dynamic motor tasks is still undetermined. In order to explore the role of tactile stimulation in dynamic motion tasks, we examined the correlation between EEG/EMG in a motor task with tactile stimulus input, including the corticomuscular coherence and the causal connections (convergent cross mapping, CCM). In this study, seventeen subjects were recruited to complete stimuli and non-stimuli motor tasks. After the experiment, the time-frequency analysis of CMC showed that the somatosensory association cortex was clearly involved in the dynamic motor tasks. During the contraction of hand muscles, the activity of CMC was concentrated in gamma band, while in the maintenance process, it was concentrated in beta-band. After eliminating the distractors of attention, we did not find a similar result as previous studies had found-tactile stimuli lead to increased CMC activity in gamma band. On the contrary, CCM causality analysis showed that tactile stimulation could significantly enhance the connection between the cerebral cortex and a muscle. We speculate that tactile stimulation can enhance the corticomuscular causal relationship, and that the effect of tactile stimulation on corticomuscular coherence may have more complex mechanisms. This study provides new insights into neural mechanism of tactile feedback and provides more information about the causality of brain networks in tactile feedback task.

中文翻译：

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带触觉刺激的皮质神经连接的模式重组。

对触觉刺激的敏感性是人体运动控制中必不可少的反馈。但是，以前的触觉刺激研究主要集中在浅层触觉刺激对运动皮层的影响，但是深度触觉反馈刺激在运动任务中的作用尚不清楚。皮质神经相干性（CMC）是研究动态运动任务的有效方法。最近的证据表明，通过β波段的触觉刺激可以增强CMC。但是，动态运动任务中的触觉刺激机制仍未确定。为了探讨触觉刺激在动态运动任务中的作用，我们研究了在具有触觉刺激输入的运动任务中脑电图/脑电图之间的相关性，包括皮质小球相干性和因果关系（会聚交叉映射，CCM）。在这个研究中，招募了十七名受试者完成刺激和非刺激运动任务。实验后，CMC的时频分析表明，体感联想皮层明显参与了动态运动任务。在手部肌肉的收缩过程中，CMC的活性集中在γ带，而在维持过程中，CMC的活性集中在β带。消除注意力分散因素后，我们没有发现类似的结果，因为以前的研究发现，触觉刺激会导致伽玛带CMC活性增加。相反，CCM因果关系分析表明，触觉刺激可以显着增强大脑皮层与肌肉之间的连接。我们推测，触觉刺激可以增强皮质肾因果关系，并且触觉刺激对皮层细胞一致性的影响可能具有更复杂的机制。这项研究为触觉反馈的神经机制提供了新的见解，并提供了有关触觉反馈任务中脑网络因果关系的更多信息。