不同手指自主施力表現與動作相關腦電位關係

Movement-related cortical potentials associated with different fingers voluntary force production.

侯昆亨(Hou-Kun Heng)

指導教授 ： 蔡正倫 ； 蔣懷孝

中原大學/工學院/生物醫學工程研究所/碩士(2014年)

https://doi.org/10.6840/CYCU.2014.00014

摘要

已有研究證實手指活動相關之神經機制是動作皮質的神經元存在著特定手指控制之高層動作策略，此研究針對單指動作與非作用指間的牽制效應，設計五組不同手指組合以執行50%MVC的施力任務，當單、雙手控制手指施力動作時，藉由量測手指施力的準確度、牽制力量與手指協調來分析大腦高層運動中樞在施力動作間的神經策略機制。
所有受試者皆分別進行單手單指(右手食指、右手中指)、單手雙指(右手食指+右手中指)、雙手同指(左手食指+右手食指)、雙手異指(左手中指+右手食指)等五組任務，分析施力任務的準確度及非作用指之牽制力，並將五種任務的動作相關電位訊號，依照動作準備期(BP)、動作開始期(MP)、力量上升期(Ramp)、力量穩定期(Static)等四段腦波成份來進行分析。
結果顯示單指任務之中，以右手食指之施力準確度最高、牽制效應最低，伴隨之動作電位亦高於其他任務；在動作電位成份方面，施力過程的力量上升期之動作電位高於其他施力階段，表示持續施力的神經控制較為複雜。而獨立性較高的食指一旦與其他手指合併動作時，則動作電位明顯降低；其中又以雙手同時使用時會呈現較低的腦波電位。

關鍵字

牽制效應 ； 力量變化率 ； 動作相關電位

並列摘要

Recent studies show that the neural mechanism related to finger coordination is dominated by the higher level of motor strategy of motor cortex associated with finger control. This study applied the enslaving effect between single finger and slaved fingers. Five different tasks were designed to perform 50% MVC finger force production. The accuracy of force traces, enslaving effects among slaved fingers, and finger force behaviors were analyzed to explore the cortical motor mechanism associated with finger force production.
All subjects performed five tasks which were one finger of one hand (index finger of right-hand, middle finger of right-hand), two fingers of one hand (index and middle of right-hand), the identical finger of two hands (the index fingers), and the different fingers of one hand (the right index and middle finger). The force traces generated by the assigned finger, the force generated by the slaved fingers, and the movement-related potentials of the tasks were analyzed. The components of movement-related potentials were divided into the preparation phase, the motor phase, the ramp phase and the static phase.
The results showed that the accuracy of force trace was the highest for one finger of one hand. The right index finger accompanied with the lowest enslaving and the highest amplitude of movement-related potentials. Among the four components of potentials, the ramp phase demonstrated the higher amplitude than the other three components. However, the amplitude of the right index finger decreased while performing tasks with other fingers.

並列關鍵字

enslaving effect ； movement-related potentials ； finger ； rate of force development

參考文獻

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