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The learning of a new motor task entails neural changes in spinal pathways. This study aimed to investigate alterations in the common synaptic inputs to spinal motor neurons during the short-term acquisition of a force-matching skill. 11, 13 and 17 participants had the first dorsal interosseus, tibialis anterior, and vastii muscles tested, respectively. They performed 15 isometric force-matching contractions at 5 or 10% of the maximal voluntary contraction. High-density surface electromyograms were decomposed for two selected trials: pre- and post-learning. The motor units were matched between trials and the coherence between cumulative spike trains was calculated within alpha (5–15 Hz) and beta (15–35 Hz) bands. In both individual and synergistic muscles, improvements in force-matching were followed by reductions in the alpha band, but not beta band. These findings suggest that during the learning of a new task, the central nervous system filters tremor noise oscillations unrelated to the required task.

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Modulation of Shared Synaptic Inputs to Spinal Motor Neurons During Short-Term Acquisition of a Skill Learning Task

  • 会议论文

  • 发表日期：

    2025年

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  • Hélio V. Cabral,
  • Caterina Cosentino,
  • Milena A. dos Santos,
  • Elmira Pourreza,
  • J. Greig Inglis,
  • Francesco Negro

摘要

The learning of a new motor task entails neural changes in spinal pathways. This study aimed to investigate alterations in the common synaptic inputs to spinal motor neurons during the short-term acquisition of a force-matching skill. 11, 13 and 17 participants had the first dorsal interosseus, tibialis anterior, and vastii muscles tested, respectively. They performed 15 isometric force-matching contractions at 5 or 10% of the maximal voluntary contraction. High-density surface electromyograms were decomposed for two selected trials: pre- and post-learning. The motor units were matched between trials and the coherence between cumulative spike trains was calculated within alpha (5–15 Hz) and beta (15–35 Hz) bands. In both individual and synergistic muscles, improvements in force-matching were followed by reductions in the alpha band, but not beta band. These findings suggest that during the learning of a new task, the central nervous system filters tremor noise oscillations unrelated to the required task.