This study investigated the corticospinal excitability of reciprocal muscles during tasks involving sensory difference between proprioceptive and visual inputs. Participants were instructed to relax their muscles and to observe a screen during vibratory stimulation. A video screen was placed on the board covering the right hand and forearm. Participants were randomly tested in four conditions: resting, control, static, and dynamic. The resting condition involved showing a black screen, the control condition, a mosaic patterned static videoclip; the static condition, a static videoclip of wrist flexion 0°; and the dynamic condition, a videoclip that corresponded to each participant's closely-matched illusory wrist flexion angle and speed by vibration. Vibratory stimulation (frequency 80 Hz and duration 4 s) was applied to the distal tendon of the dominant right extensor carpi radialis (ECR) using a tendon vibrator in the control, static, and dynamic conditions. Four seconds after the vibratory stimulation (end of vibration), the primary motor cortex at the midpoint between the centers of gravity of the flexor carpi radialis (FCR) and ECR muscles was stimulated by transcranial magnetic stimulation (TMS). The ECR motor evoked potential (MEP) amplitudes significantly increased in the control condition compared to the resting condition, whereas the FCR MEP amplitudes did not change between the resting and control conditions. In addition, the ECR MEP amplitudes significantly increased in the static condition compared to the dynamic condition. However, the FCR MEP amplitudes significantly increased in the dynamic condition compared to the static condition. These results imply that the difference between visuo-proprioceptive information had an effect on corticospinal excitability for the muscle. In conclusion, we found that proprioceptive and visual information differentially altered the corticospinal excitability of reciprocal muscles.

中文翻译：

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视觉和本体感受刺激对交互性肌肉的皮质脊髓输出的不同作用。

这项研究调查了在涉及本体感受和视觉输入之间的感觉差异的任务期间，交互肌肉的皮质脊髓兴奋性。指示参与者在振动刺激期间放松肌肉并观察屏幕。将视频屏幕放在覆盖右手和前臂的板上。在四个条件下对参与者进行了随机测试：休息，控制，静态和动态。静止状态包括显示黑屏，控制状态，镶嵌图案的静态视频剪辑；在静态条件下，腕部屈曲0°的静态视频剪辑；动态条件是一个视频剪辑，该视频剪辑对应于每个参与者通过振动紧密匹配的虚幻腕部弯曲角度和速度。在控制，静态和动态条件下，使用肌腱振动器将振动刺激（频率为80 Hz，持续时间为4 s）施加到占优势的右伸腕腕radial骨（ECR）的远端肌腱上。振动刺激（振动结束）后四秒钟，经颅磁刺激（TMS）刺激位于radial侧腕（FCR）和ECR肌肉重心之间的中点的初级运动皮层。与静止状态相比，ECR电动机的诱发电位（MEP）振幅在控制状态下明显增加，而FCR MEP振幅在静止状态和控制状态之间没有变化。此外，与动态条件相比，静态条件下的ECR MEP幅度显着增加。然而，与静态条件相比，动态条件下的FCR MEP幅度显着增加。这些结果表明，内视本体感受信息之间的差异对肌肉的皮质脊髓兴奋性有影响。总之，我们发现本体感受和视觉信息差异性地改变了交互肌肉的皮质脊髓兴奋性。