Gamma-range corticomuscular coherence during dynamic force output
Gamma-range corticomuscular coherence during dynamic force output
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DOI：
10.1016/j.neuroimage.2006.10.018
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发表时间：
2007-02-01
期刊：
影响因子：
5.7
通讯作者：
Kristeva, Rumyana
中科院分区：
文献类型：
--
作者：
Omlor, Wolfgang;Patino, Luis;Kristeva, Rumyana
脑电/脑电-肌电图相干性揭示的皮层运动和肌肉活动之间的β -范围同步已被广泛研究用于稳态运动输出。然而，缺乏与动态力输出相关的皮质肌肉一致性调节的信息。我们通过比较8名健康受试者在视觉运动任务中的脑电图-肌电图一致性和皮质运动频谱功率来解决这个问题。在视觉运动任务中，受试者用右手食指施加稳态或周期性调节的动态等距力输出来保持视觉光标在目标区域内。在静态条件下，显著相干仅限于β范围。在动态条件下，最明显的相干性发生在γ -范围，显著的β -范围相干性明显减弱。在动力输出过程中，皮层运动功率在β范围内下降，而在γ范围内没有明显变化。我们得出结论，在动力过程中，感觉运动系统的皮质-脊髓振荡模式转向更高的频率（主要是伽马），以便快速整合视觉和体感信息，以产生适当的运动命令。(c) 2006爱思唯尔公司版权所有。
The beta-range synchronization between cortical motor and muscular activity as revealed by EEG/MEG-EMG coherence has been extensively investigated for steady-state motor output. However, there is a lack of information on the modulation of the corticomuscular coherence in conjunction with dynamic force output. We addressed this question comparing the EEG-EMG coherence and the cortical motor spectral power in eight healthy subjects in a visuomotor task, in which the subjects exerted a steady-state or periodically modulated dynamic isometric force output with their right-index finger to keep a visual cursor within a target zone. In the static condition, significant coherence was confined to the beta-range. In the dynamic condition, the most distinct coherence occurred in the gamma-range and the significant beta-range coherence was strikingly reduced. The cortical motor power in the beta-range during dynamic force output was decreased, whereas the power in the gamma-range remained without significant change. We conclude that during dynamic force the corticospinal oscillation mode of the sensorimotor system shifts towards higher (principally gamma) frequencies for the rapid integration of the visual and somatosensory information required to produce the appropriate motor command. (c) 2006 Elsevier Inc. All rights reserved.