Wu Ching-Yi, Lin Keh-Chung, Lin Kwan-Hwa, Chang Chein-Wei, Chen Chia-Ling
Department of Occupational Therapy, Chang Gung University College of Medicine, Tao-yuan.
Percept Mot Skills. 2005 Jun;100(3 Pt 2):983-94. doi: 10.2466/pms.100.3c.983-994.
Understanding the control of movement requires an awareness of how tasks constrain movements. The present study investigated the effects of two types of task constraints--spatial accuracy (effector size) and target location--on reaching kinematics. 15 right-handed healthy young adults (7 men, 8 women) whose mean age was 23.6 yr. (SD=3.9 yr.) performed the ringing task under six conditions, formed by the crossing of effector size (larger vs smaller size) and target location (left, right, or a central position). Significant main effects of effector size and target location were found for peak velocity and movement time. There was a significant interaction for the percentage of time to peak velocity. The findings suggested that task constraints may modulate movement performance in specific ways. Effects of effector size might be a consequence of feedforward and feedback control, and location effects might be influenced by both biomechanical and neurological factors.
理解运动控制需要了解任务如何限制运动。本研究调查了两种类型的任务限制——空间精度（效应器大小）和目标位置——对伸手运动学的影响。15名右利手健康年轻人（7名男性，8名女性），平均年龄为23.6岁（标准差 = 3.9岁），在由效应器大小（较大与较小）和目标位置（左、右或中央位置）交叉形成的六种条件下执行按铃任务。在峰值速度和运动时间方面发现了效应器大小和目标位置的显著主效应。在达到峰值速度的时间百分比上存在显著交互作用。研究结果表明，任务限制可能以特定方式调节运动表现。效应器大小的影响可能是前馈和反馈控制的结果，而位置影响可能受生物力学和神经学因素的影响。
