Kamii Yasushi, Kojima Sho, Onishi Hideaki
Graduate School, Niigata University of Health and Welfare, Niigata, Japan.
Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare, Niigata, Japan.
Front Hum Neurosci. 2022 Aug 18;16:876083. doi: 10.3389/fnhum.2022.876083. eCollection 2022.
The purpose of this study was to examine whether anodal transcranial direct current stimulation (a-tDCS) over the posterior parietal cortex (PPC) could affect visuomotor performance and proprioception in the lower extremities. We evaluated visuomotor performance in 15 healthy volunteers using a visuomotor control task by plantar dorsiflexion of the ankle joint, and calculated the absolute difference between the target and measured angle. In addition, we evaluated proprioception using a joint position matching task. During the task, the subject reproduced the ankle joint plantar dorsiflexion angle presented by the examiner. We calculated the absolute difference between the presented and measured angles (absolute error) and the variation of measured angles (variable error). Simultaneously, a-tDCS (1.5 mA, 15 min) or sham stimulation was applied to the right PPC. We observed that the absolute error of the visuomotor control task and the variable error of the joint position matching task significantly decreased after a-tDCS. However, the absolute error of the joint position matching task was not affected. This study suggests that a-tDCS over the PPC improves visuomotor performance and reduces the variable error in the joint position matching task.
本研究的目的是检验对顶叶后皮质（PPC）进行阳极性经颅直流电刺激（a-tDCS）是否会影响下肢的视觉运动表现和本体感觉。我们通过踝关节背屈的视觉运动控制任务，对15名健康志愿者的视觉运动表现进行了评估，并计算了目标角度与测量角度之间的绝对差值。此外，我们使用关节位置匹配任务对本体感觉进行了评估。在任务过程中，受试者重现检查者给出的踝关节背屈角度。我们计算了给出角度与测量角度之间的绝对差值（绝对误差）以及测量角度变化（可变误差）。同时，对右侧PPC施加a-tDCS（1.5 mA，15分钟）或假刺激。我们观察到，a-tDCS后视觉运动控制任务的绝对误差和关节位置匹配任务的可变误差显著降低。然而，关节位置匹配任务的绝对误差未受影响。本研究表明，对PPC进行a-tDCS可改善视觉运动表现，并减少关节位置匹配任务中的可变误差。
