書寫是典型的日常肢體活動，執筆手的選用受到遺傳因子與社會文化等因素所影響，而書寫規則與筆勢的形成，多是由主流書寫者族群發展而出，引致各類型書寫者在動作形式與書寫表現上的差異。目的：本研究藉由分析兩書寫者族群在不同書寫情境下的書寫表現以釐清動作控制的可能機制；方法：招募12名左慣用手書寫者與12名右慣用手書寫者，在不同情境下執行書寫任務，自變項為書寫者類型、執筆手、字體尺寸及筆畫之連斷，以數位攝影機拍攝參與者書寫軌跡，並記錄書寫錯誤次數，用以分析不同情境下的書寫表現。結果：慣用手書寫相較於非慣用手書寫有更短的書寫時間，字體愈大，書寫時間愈長，書寫連筆字形時的書寫時間較斷筆字形短；此外，在小字、斷筆與慣用手書寫情境發生較多的錯誤試作。結論：書寫的正誤及書寫時間受到執筆手、字體尺寸與字形筆畫斷連的影響。

Writing is a typical daily limb activity. The choice of writing hand is affected by some factors such as heredity and social culture. The writing rules and stroke tendencies have been developed mostly by the main strain of the writers' type, inducing different movement patterns and writing performance of various types of writers. Purpose: This study attempted to find out the potential mechanism of motor control by analyzing the writing performance of two types of writers under various writing conditions. Method: Twelve right-handed writers and twelve left-handed writers were recruited and were requested to conduct the writing task under various writing conditions. Independent variables included the types of writers, writing hand, character sizes and stroke continuance. The writing traces were filmed by digital camera and the error trials were also recorded for analyzing the writing performance in various conditions. Results: Writing with the dominant hand had shorter writing duration than writing with the non-dominant hand. The larger the character sizes were, the longer the writing duration would be. Writing linked strokes took less time than writing broken strokes. Besides, more error trials were occurred in small character, broken stroke and dominant hand conditions. Conclusion: The findings suggest that writing correctness and writing duration are affected by writing hands, character sizes and stroke continuance.