前言：日常生活活動多需雙手共同執行，雙手動作可據其型態分為對稱與不對稱動作。對稱與不對稱動作具備不同機制與動作控制策略，且其表現會受發展成熟度與動作型態影響，但目前文獻探討有限。故本研究欲探討對稱與不對稱雙手任務在健康成人與典型發展孩童的雙手動作表現差異。方法：本研究共招募 15 名健康成人及 15 名典型發展孩童執行三種雙手汲取抓握任務：1 種對稱任務及 2 種不對稱任務（慣用手為任務手及非慣用手為任務手），以三維動作捕捉系統紀錄端點的動作軌跡，分析其雙手各別端點控制及雙手協調，並比較不同年齡及情境對雙手動作表現的影響。結果：成人在所有情境中，雙手的反應時間、達尖峰速度時間百分比及動作單位都顯著較孩童小。相較於對稱情境，成人在不對稱情境中的輔助手汲取動作時間皆增加，且尖峰速度減少，孩童僅在慣用手為任務手情境中動作時間減少，且尖峰速度顯著增加。所有受試者皆是對稱情境的雙手協調比不對稱情境同步，但是只有成人組在對稱情境的雙手動作時間較不對稱情境短。結論：成人在所有雙手情境的動作準備效率、動作品質及動作計畫皆優於孩童，且在不對稱動作中較傾向將雙手動作整合執行。此外，所有受試者皆是對稱動作比不對稱動作同步。

Introduction: Most of the daily activities requires both hands involved, and the bimanual tasks can be classified into symmetric and asymmetric movements. The symmetric and asymmetric bimanual tasks may have different underlying mechanisms and motor control strategies, and its performance may be influenced by age, but relative exploration was limited. Thus, this study aimed to compare the bimanual motor performance of symmetric and asymmetric bimanual task in healthy adults and typically development children (TDC). Methods: Fifteen healthy adults and 15 TDC were recruited to perform 3 bimanual task (1 symmetric and 2 asymmetric condition). The endpoint trajectories were recorded by 3-dimentional motion capture system. Endpoint control and bimanual coordination were analyzed to compare the influence of age and conditions. Results: In all conditions, the adult group demonstrated shorter reaction time, less percentage of time to peak velocity (PV) and less movement unit as compared to the TDC group. Compared to the symmetric condition, the assist hand of the adult group showed longer movement time and smaller PV in the asymmetric conditions. The task hand of the TDC group showed shorter movement time and larger PV only in the dominant hand as task hand condition, comparing to another two conditions. All participants demonstrated more synchronized bimanual coordination in the symmetric conditions than the asymmetric conditions. Conclusion: Adults demonstrated better movement preparation efficiency, movement quality and motor planning than children in all conditions, and also tend to integrate bimanual movement into a single unit in asymmetric conditions. Besides, both groups demonstrated more synchronization in the symmetric bimanual movements than asymmetric bimanual movements.