Billon M, Bootsma R J, Mottet D
Mouvement & Perception (UMR 6559), University of the Mediterranean, 163 avenue de Luminy, BP 910,13288, Marseille, France.
Neurosci Lett. 2000 May 26;286(1):49-52. doi: 10.1016/s0304-3940(00)01089-2.
The goal of the present study was to explore the relation between speed-accuracy trade-off phenomena and action kinematics in the case of pointing under isometric conditions. Increasing task difficulty resulted in a linear increase in movement time (as predicted by Fitts' law) and in systematic changes in the spatio-temporal patterning of force production. The observed changes in motion topology were similar to those reported for isotonic tasks and adequately captured by a limit cycle model derived for the latter type of task. These results indicate that, for isometric force control as for isotonic position control, the reasons underlying the emergence of Fitts' law might be sought in dynamic trajectory formation processes.
本研究的目的是探讨在等长条件下进行指向任务时速度-准确性权衡现象与动作运动学之间的关系。任务难度的增加导致运动时间呈线性增加（如菲茨定律所预测），并且力产生的时空模式发生系统性变化。观察到的运动拓扑结构变化与等张任务中报告的变化相似，并且可以由为后一种类型任务推导的极限环模型充分捕捉。这些结果表明，对于等长力控制和等张位置控制而言，菲茨定律出现的潜在原因可能要从动态轨迹形成过程中寻找。
