Task-specificity of Enslaving Effect and movement-related Cortical Potential Associated with Force Transition in multi-finger Force Production

動作相關電位與手指力量轉換間的任務特殊性

蔣懷孝(Huai-Hsiao Chiang)

《臺灣運動心理學報》 15期 (2009/11) Pp. 41-60

https://doi.org/10.6497/BSEPT.20091101_(15).0004

摘要

目的：本文探討力量轉換過程間對牽制效應在行爲與大腦電位的角色。方法：實驗設計以最大肌力之20%及60%進行由低至高及由高至低不同之力量轉換，17名某北部大學生以單指進行力量輸出，並蒐集其他手指力量施力情況，以分析牽制效應在力量轉換過程之行爲與動作電位。結果：結果發現在力量誤差與牽制效應上，食指顯示二者結果均爲最小，而無名指均爲最大。在動作電位上，食指出現之動作電位呈現最高，而無名指爲最小，手指行爲與動作電位二者呈反比關係。動作電位的六個成份分別爲準備期、動作期、力量上升期、力量維持前期、力量轉換期與力量維持後期等，在不同手指間均有顯著差異。結論：在相同變化率的力量轉換期中，由高至低的力量輸出產生較高的動作電位，有別於過去電位隨著力量遞增的結果，故在多指等長力量輸出的動作電位不僅在施力手指、力量大小、力量變化率外，本研究證明在力量轉換過程中之任務特殊性上亦存在著特定的關係。

關鍵字

手指 ； 力量牽制 ； 力量轉換 ； 動作相關電位

並列摘要

Purpose: The present research was designed to study the role of transition during force production in the enslaving phenomenon. Methods: We examined behaviorally two levels of force production (20% and 60% of MVC) with two different rates of force development (RFD) followed by a static phase, transition of force, and another static phase. Subjects kept all four fingers on separate load cells while using the specified finger to produce the required force which allowed us to measure the enslaving effect on the other fingers. Results: The behavioral results have shown that the index finger revealed the least whereas the ring finger revealed the most force error and force enslaving. In terms of EEG results, the index finger revealed larger movement-related cortical potential (MRCP) whereas the ring finger displayed less amplitude. For the six components of MRCP (BP, MP, MMP(superscript ramp), MMP(superscript static1), MMP(superscript transition), MMP(superscript static2)), the ANOVA indicated a significant main effect of task which the index finger produced higher amplitude of MRCP. Providing with the same RFD on the transition phase, higher amplitudes of MRCP was found during the decrement of force. In other words, the higher MRCP was not only produced on higher RFD but also was found in the decrement of force. Conclusion: Overall, the whole complex of MRCP components during multi-finger isometric force production tasks reflect a combination of factors including the primary end-effector performing the task, the interaction of task, and the amount of nominal force.

並列關鍵字

Finger ； Force enslaving ； Movement-related cortical potentials ； Force transition

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