- 學位論文
左右手雙指施力控制與大腦動作電位分析
Force control and movement-related cortical potentials associated with two fingers of both left and right hands
摘要
此論文研究雙手手指施力控制的交互影響，藉由改變手指的相互配對量測施力控制的準確度與牽制力量，並監測腦波電位的變化。過去研究已知食指之獨立性高於其他三指，其次為小指、中指、無名指。故此實驗中將手指分為獨立手指(食指、小指)及手掌中間的穩定手指(中指、無名指)進行配對分析。實驗設計中安排受試者進行右手單指：(食指、中指、無名指、小指)；右手雙指(食指＋小指、中指＋無名指)；左手雙指(食指＋小指、中指＋無名指)；雙手四指：雙手相同獨立手指(食指＋小指)、相同穩定手指(中指＋無名指)及雙手獨立手指與穩定手指相互配對(左手:食指＋小指、右手:中指＋無名指) (左手:中指＋無名指、右手:食指＋小指)，共計十二種任務。在同時間蒐集了施力曲線、牽制效應及動作電位變化的量測數據。腦波則分為動作準備期、動作開始期、力量上升期與力量維持期等四個階段，以分別分析大腦運動神經中樞在施力表現時動作相關電位的變化關係。 施力結果顯示右手單指以無名指的誤差率最高，食指的誤差率最小，單手雙指的項目中，獨立手指與穩定手指較單一手指之施力誤差率明顯地降低，但穩定手指的誤差率則低於獨立手指，在雙手四指的相同獨立手指與穩定手指任務中，亦發現相同的趨勢；雙手的牽制力皆在獨立手指出現較大的牽制效應。在腦動作電位的結果中，右手穩定手指施力時訊號強度最大，其次依序為左手的獨立手指，右手的獨立手指，左手的穩定手指最低。在雙手四指任務中，相同的穩定手指高於獨立手指，而相異手指任務之大腦動作電位高於相同手指任務。
並列摘要
The coupling of finger control was studied in this research by measuring the accuracy of finger force control, enslaving effect and fingers of each other. Past research has shown that the independence of index finger is higher than the other three fingers, followed by the little finger, middle finger, and ring finger. The experiments in this study implemented index finger and little finger as independent fingers, and middle finger and ring finger as dependent fingers for paired analysis. Multiple experiments were carried out for analyzing the neural mechanism related to potential changes in the motor area of the brain. The subjects were asked to perform twelve kinds of task including right-handed single-fingered (index, middle, ring, or little finger), two-fingered (I + L, M + R) for both hands. Four-fingered settings were hands with the same setting of independent fingers (I + L), the same setting of dependent fingers (M + R), and that of non-congruent settings. The dependent variables that were measured include the accuracy of force curves, the force of enslaved fingers and the amplitudes movement-related potentials. Brain potentials were divided into four time intervals: bereitschafts potential phase, motor potential phase, ramp phase, and static phase to carry out data analysis. The results showed that right index finger has the highest accuracy whereas the accuracy of ring finger was the lowest. For single-handed two-finger task, both the IL and MR tasks revealed less error than that of individual finger alone. The accuracy of IL was less than that of MR. The tendency of the four fingers tasks in both hands showed the same outcomes to that of one hand. The enslaving effect appeared stronger on independent fingers than that of dependent fingers. For the results of the movement-related potentials associated with two-fingered, the M + R of right hand showed greater amplitudes than those of I + L of left hand, I + L of right hand, and M + R of left hand. On the four-fingered tasks, amplitude for both hands of the dependent fingers were higher than that of the same independent finger. Non-congruent finger setting of two hands revealed greater amplitude than that of congruent finger setting.