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This study investigates the frequency-dependent effects of vibratory stimulation on corticomuscular coherence (CMC) during isometric grip tasks. Synchronized EEG and high-density surface EMG (HD-sEMG) signals were recorded from six healthy subjects under four conditions: force-only, relaxation with 120 Hz vibration, force with 120 Hz vibration, and force with 40 Hz vibration. Results revealed a significant beta-band CMC peak over the contralateral motor cortex (C3) during force-only tasks, indicating dominant cortical control. Superimposing 120 Hz vibration abolished this peak during active contraction (p = 0.0225 vs. force-only), suggesting spinal reflex pathways (e.g., tonic vibration reflex) may partially mediate the motor output. In contrast, 40 Hz vibration preserved CMC synchrony (p = 0.2506). These findings demonstrate that high-frequency vibration attenuates corticomuscular functional connectivity via spinal mechanisms, providing insights for neuromodulation strategies in motor rehabilitation and neural interfaces.

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Sensory Input Shapes Motor Output: Decoding Corticomuscular Coherence Under Vibration-Induced Modulation

  • 会议论文

  • 发表日期：

    2026年

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  • Xuefei Zhou,
  • Huan Wen,
  • Yueming Wang,
  • Lin Yao,
  • Kedi Xu

摘要

This study investigates the frequency-dependent effects of vibratory stimulation on corticomuscular coherence (CMC) during isometric grip tasks. Synchronized EEG and high-density surface EMG (HD-sEMG) signals were recorded from six healthy subjects under four conditions: force-only, relaxation with 120 Hz vibration, force with 120 Hz vibration, and force with 40 Hz vibration. Results revealed a significant beta-band CMC peak over the contralateral motor cortex (C3) during force-only tasks, indicating dominant cortical control. Superimposing 120 Hz vibration abolished this peak during active contraction (p = 0.0225 vs. force-only), suggesting spinal reflex pathways (e.g., tonic vibration reflex) may partially mediate the motor output. In contrast, 40 Hz vibration preserved CMC synchrony (p = 0.2506). These findings demonstrate that high-frequency vibration attenuates corticomuscular functional connectivity via spinal mechanisms, providing insights for neuromodulation strategies in motor rehabilitation and neural interfaces.