手指力量轉換行為之腦波電位擷取與分析

Acquisition and analysis for finger force transition and movement-related potential

薛承凱(Chung-Kai Hsueh)

指導教授 ： 徐良育

中原大學/工學院/醫學工程研究所/碩士(2010年)

https://doi.org/10.6840/cycu201000131

摘要

本研究探討將單指與雙指做相同的力量變化率做比較，並在經過一穩定期後，對雙指瞬間做力量轉換，包括增加或釋放指力，並對施力過程進行力量誤差的探討。由於大腦對不同手指之控制，存在動作電位上的差異，本文並探討單指(食指或中指)做增加指力或雙指做釋放指力過程與腦波的相關性。實驗對象為20名大學學生，針對右手食指與中指施力後，進行四種特定手指等長收縮增減控制，即先食指後加中指、先中指後加食指、先二指後移除中指、先二指後移除食指。每組實驗均共有五段力量分期，依施力時間順序分別為力量上升前期(ramp1)、力量上升後期(ramp2)、第一段力量維持期(static1)、力量轉換期(transition)與第二段力量維持期(static2)。
就力量誤差的分析，結果發現整體上仍以食指的誤差較小，獨立性比較高；中指的誤差較大，依賴性比較高。而在力量轉換期以中指加入食指的誤差值最低，配合力量變化率可以說明力量在釋放時操控不如力量在增加時來得穩定。在兩指合力移除食指的試驗中，中指施力的依賴性較高，顯示中指的牽制效應較食指為高，而兩指合力移除中指的試驗中，食指出現較高的力量速率，以及較高的相對力量，明顯不受牽制效應影響。
腦波結果方面，本研究依據不同力量分期就腦波區分七個時間成分(BP, MP, MMPramp1, MMPramp2, MMPstatic1, MMPtransition, MMPstatic2)進行統計分析後發現，在力量轉換期當中，平均腦波放電量在四種試驗中比起維持期皆有明顯的提升，可以說明在指力轉換的動作時，大腦需要進行額外的控制，而就針對增加或釋放指力而言，並沒有顯著的差異，可以說明對於瞬間增加或釋放指力的動作策略對大腦的行為控制上是相同的。而因食指的準確性、獨立性與腦波放電量較高，中指則較低，整體行為動作策略上由單獨食指開始動作的放電量最高，兩指合力次之，中指最低，且不受力量轉換期的影響。

關鍵字

牽制效應 ； 腦波 ； 力量轉換 ； 手指

並列摘要

In this research we used constant rate of force development (RFD), focusing on both force error and enslaving effect associated with different fingers and cortical activities during increment as well as decrement of force. Experimental subjects were 17 college students. They were instructed to use four fingers of right hand to produce force on specific patterns of force. Subjects were produce four force phases with 1s interval duration which were ramp phase, first static phase, transition phase and second static phase (2s), respectively.
Behaviorally, the index finger revealed the least force error and force enslaving whereas the ring finger represented the most in the force transition phase. The AVOVA indicated that there were significant effects during force decrement phase for both the force error and enslaving than those of force increment phase for all fingers. Not surprisingly, larger enslaving effect was found on the finger directly adjacent to the master finger for both force increment and decrement phases.
In terms of EEG results, the index finger revealed larger movement-related cortical potential (MRCP) whereas the ring finger displayed lower for both force increment and decrement phases. For the six components of MRCP (BP, MP, MMPramp, MMPstatic1, MMPtransition, MMPstatic2), the ANOVA indicated a significant main effect of force transition, higher amplitude of MRCP was found in the force decrement. Providing with the same RFD, due to the fact that higher amplitudes of MRCP in the force decrement, the results suggested more force control stability needed. On the other hand, force error, enslaving effect and the amplitude of MRCP in force decrement phase were pronounced than those of in force increment phase in each finger.
Moreover, the result also indicated the index finger with less force error, less dependent and larger MRCP amplitudes, and reversing for the ring finger in both force increment and force decrement. Providing the behavioral and cortical data, the control characteristic for both force increment and force decrement demonstrated the task-specific mechanisms among four fingers.

並列關鍵字

EEG ； force transition ； enslaving force ； finger

參考文獻

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