Graduate School of Health Sciences, Sapporo Medical University, West 17-South 1, Chuo-ku, Sapporo City, Japan.
Neurosci Lett. 2012 Apr 11;514(1):106-9. doi: 10.1016/j.neulet.2012.02.069. Epub 2012 Mar 3.
A novel method of visual stimulus, reported by Kaneko et al. [14], induced a vivid kinesthetic illusion and increased the corticomotor excitability of the finger muscles without any overt movement. To explore the effect of this method on the lower limbs, motor evoked potentials (MEP) were recorded from the left tibialis anterior (TA) and soleus muscles using transcranial magnetic stimulation (TMS). A computer screen that showed the moving image of an ankle movement was placed over the subject's leg, and its position was modulated to induce an illusory sensation that the subject's own ankle was moving (illusion condition). TMS was delivered at rest and at two different times during the illusion condition (ankle dorsiflexion phase: illusion-DF; ankle plantarflexion phase: illusion-PF). The MEP amplitude of the TA, which is the agonist muscle for ankle dorsiflexion, was significantly increased during the illusion-DF condition. This indicated that the visual stimulus showing the moving image of an ankle movement could induce a kinesthetic illusion and selectively increase the corticomotor excitability in an agonist muscle for an illusion, as was previously reported for an upper limb. The MEP amplitude of the soleus, which is the agonist muscle for ankle plantarflexion, increased during the illusion-PF condition, but not significantly. Because of the vividness of the illusory sensation was significantly greater during the illusion-DF condition than the illusion-PF condition, we concluded that the vividness of the illusory sensation had a crucial role in increasing corticomotor excitability.
一种新的视觉刺激方法，由 Kaneko 等人[14]报道，可以在没有任何明显运动的情况下产生生动的运动错觉，并增加手指肌肉的皮质运动兴奋性。为了探索这种方法对下肢的影响，使用经颅磁刺激（TMS）记录了左胫骨前肌（TA）和比目鱼肌的运动诱发电位（MEP）。将显示踝关节运动的移动图像的计算机屏幕放置在受试者的腿部上方，并对其位置进行调制，以产生受试者自己的踝关节正在运动的错觉（错觉条件）。TMS 在休息时和错觉条件下的两个不同时间点（踝关节背屈阶段：错觉-DF；踝关节跖屈阶段：错觉-PF）给予。作为踝关节背屈的拮抗剂肌肉的 TA 的 MEP 振幅在错觉-DF 条件下显著增加。这表明，显示踝关节运动的移动图像的视觉刺激可以产生运动错觉，并选择性地增加错觉拮抗剂肌肉的皮质运动兴奋性，这与先前对上肢的报道一致。作为踝关节跖屈的拮抗剂肌肉的比目鱼肌的 MEP 振幅在错觉-PF 条件下增加，但不显著。由于在错觉-DF 条件下的错觉感觉比在错觉-PF 条件下更生动，我们得出结论，错觉感觉的生动性在增加皮质运动兴奋性方面起着至关重要的作用。
