手指施力在速度與準度之動作相關電位

Movement-Related Cortical Potentials Associated with Speed and Accuracy during Finger Force Production

10.6646/CYPEJ.202012_(15).0003

蔣懷孝(Huai-Hsiao Chiang)

動作相關電位 ； 速度 ； 準度 ； 手指 ； 力量變化率 ； Movement-Related Cortical Potentials (MRCPs) ； Speed ； Accuracy ； Finger ； Rate of Force Development

中原體育學報

15期（2020 / 12 / 01）

24 - 35

繁體中文

速度與準度因素對於人體動作控制上有顯著影響，本研究以食指進行間隔與連續施力動作，探索大腦動作相關電位（Movement-related cortical potentials, MRCP）之影響。12名受試者以左右食指在固定施力範圍內，就不同力量大小與控制速率之間，單一手指進行連續性與間隔性之按壓控制，以釐清速度與準度二者控制因素，對於左右食指在施力過程之動作電位差異。研究結果發現，就連續與間隔之力量輸出，動作電位的準備（Readiness potential, RP）、起始（Motor potential, MP）與執行（Movement-monitoring potential, MMP）三個階段中，僅執行電位顯著大於準備與起始電位，其中不論手指進行連續或間隔動作，在高速率進行力量輸出之動作電位較高（F_(1,11)=8.145,P＜0.01）。故執行電位與力量變化率有顯著的相關性。此外左右手食指的執行電位又以在進行速度任務時，較相同手指施力時的準度任務為高（F_(1,11)=5,849, P＜0.01），就大腦動作電位出現或形成的啟始時間而言，Cz電極出現的時間為最早，也同樣在進行速度任務的電位輸出，明顯早於準度任務起始的時間（F_(1,11)=6.98, P＜0.05）。

Both influential parametric factors, speed and accuracy, were related with human motor control. This study explored the movement-related cortical potentials, MRCP associated with decremental and continuous force output by index fingers. 12 collegiate participants produced certain level of force and varied rate of force either by left or right index finger. The implied parameters related with speed and accuracy activated the MRCPs by effector were examined. The results found that the component of movement-monitoring potential (MMP) was significant higher than readiness potential (RP) as well as motor potential (MP), (F_(1,11)=8.145, P＜0.01). The MMP of the higher rate of force revealed more pronounced amplitude regardless of handiness. The amplitude of the MMP of index finger was higher performing speed tasks than that of accuracy, (F_(1,11)=5,849, P＜0.01). In terms of electrodes associated with temporal issues, the initiation of Cz was earlier than other electrodes, especially during the speed tasks than that of accuracy, (F_(1,11)=6.98, P＜0.05).

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