Directional organization of sensorimotor oscillatory activity related to the electromyogram in the monkey
Directional organization of sensorimotor oscillatory activity related to the electromyogram in the monkey
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DOI：
10.1016/j.clinph.2009.02.177
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发表时间：
2009-06-01
影响因子：
4.7
通讯作者：
Isomura, Yoshikazu
中科院分区：
文献类型：
--
作者：
Tsujimoto, Toru;Mima, Tatsuya;Isomura, Yoshikazu
目的：研究皮层对肌电图的控制。方法：在等张肌肉收缩任务和安静状态下，我们研究了猴感觉运动区肌电图和局部场电位振荡之间的定向传递函数（DTF）。结果：我们发现皮层和肌电信号之间的DTF在β带主要是离心的，在中央沟的前堤最大。至于感觉运动区内的皮质-皮质DTF，β带中的有效连接在中央沟中是相互的，但主要是由后到前的方向，特别是在肌肉收缩任务期间。休息条件下的DTF的不对称性是不一致的整个monkeys.Conclusions：这些研究结果表明，在后，以及中央前回产生EMG rhythmicity.Significance的功能相关性举行的潜在振荡：这支持了这样一个想法，即信息流从后到中央前回是一个关键因素，在意志肌肉收缩。(C)2009年国际临床神经生理学联合会。由Elsevier爱尔兰有限公司出版。保留所有权利。
Objective: To investigate cortical control of the electromyogram (EMG).Methods: We examined the directed transfer function (DTF) between the EMG and local field potential oscillations in the monkey sensorimotor area during both an isotonic muscle contraction task and the rest condition with EMG silence. DTF computation based on a multivariate model is suitable for analyzing the directional structure Of a reciprocally interconnected system.Results: We found that DTF between the cortex and EMG in the beta band is predominantly centrifugal and largest at the anterior bank of the central sulcus. As for the cortico-cortical DTF within the sensorimotor area, the effective connectivity in the beta band was reciprocal across the central sulcus but was dominated by a posterior-to-anterior direction, especially during the muscle contraction task. The asymmetry of the DTF during the rest condition was inconsistent across the monkeys.Conclusions: These findings indicate the functional relevance of held potential oscillations in the post- as well as pre-central gyri in generating EMG rhythmicity.Significance: This supports the idea that information flow from the post- to pre-central gyri is a key element in volitional muscle contraction. (C) 2009 International Federation of Clinical Neurophysiology. Published by Elsevier Ireland Ltd. All rights reserved.