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首页> 外文期刊>Journal of Neurophysiology >Neural correlates of task-related changes in physiological tremor
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Neural correlates of task-related changes in physiological tremor

机译：生理性震颤中与任务相关的变化与神经相关

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Appropriate control of muscle contraction requires integration of command signals with sensory feedback. Sensorimotor integration is often studied under conditions in which muscle force is controlled with visual feedback. While it is known that alteration of visual feedback can influence task performance, the underlying changes in neural drive to the muscles are not well understood. In this study, we characterize the frequency content of force fluctuations and neural drive when production of muscle force is target guided versus self guided. In the self-guided condition, subjects performed isometric contractions of the first dorsal interosseous (FDI) muscle while slowly and randomly varying their force level. Subjects received visual feedback of their own force in order to keep contractions between 6% and 10% of maximum voluntary contraction (MVC). In the targetguided condition, subjects used a display of their previously generated force as a target to track over time. During target tracking, force tremor increased significantly in the 3-5 and 7-9 Hz ranges, compared with self-guided contractions. The underlying changes in neural drive were assessed by coherence analysis of FDI motor unit activity. During target-guided force production, pairs of simultaneously recorded motor units showed less coherent activity in the 3-5 Hz frequency range but greater coherence in the 7-9 Hz range than in the self-guided contractions. These results show that the frequency content of common synaptic input to motoneurons is altered when force production is visually guided. We propose that a change in stretchreflex gain could provide a potential mechanism for the observed changes in force tremor and motor unit coherence.
机译：适当控制肌肉收缩需要将命令信号与感觉反馈相结合。通常在视觉反馈控制肌肉力量的条件下研究感觉运动整合。众所周知，视觉反馈的改变会影响任务的执行，但对肌肉神经驱动的潜在变化却知之甚少。在这项研究中，我们表征了当目标引导相对于自我引导产生肌肉力时力波动和神经驱动的频率含量。在自我引导的情况下，受试者在缓慢随机地改变其力量水平的同时，进行了第一背骨间（FDI）肌肉的等距收缩。为了使收缩保持在最大自愿收缩（MVC）的6％至10％之间，受试者接受了自身力量的视觉反馈。在目标指导的情况下，受试者使用他们先前产生的力的显示作为目标来随时间推移进行跟踪。在目标跟踪过程中，与自导收缩相比，震颤在3-5和7-9 Hz范围内显着增加。通过FDI运动单位活动的一致性分析评估了神经驱动的潜在变化。在目标制导力的产生过程中，成对同时记录的运动单位在3-5 Hz频率范围内表现出较少的相干活动，但在7-9 Hz范围内则表现出比自导收缩更大的相干活动。这些结果表明，当目视引导力产生时，运动神经元的普通突触输入的频率含量会改变。我们建议拉伸反射增益的变化可以为观察到的力震颤和运动单位相干性的变化提供潜在的机制。

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