Abstract

There is a long-held view that discrete movements aimed to a target are composed of a sequence of movement units (sub-movements) that have different roles in motor control (e.g., initial impulse, error correction and movement termination) depending on the task constraints (e.g., spatial-temporal requirements). Here we report findings from the manipulation of vision/no-vision on the prevalence and type of sub-movements in discrete movement tasks over a range of space-time task criteria. The presence of vison resulted in longer movement times compared to the no-vision counterpart in time-matching tasks. A similar vision effect was observed in the highest Index of Difficulty for time-minimization tasks. Conditions that resulted/required longer movement times demonstrated more pre-velocity-peak and post-velocity-peak types of sub-movements whereas short movement times increased the likelihood of overshooting sub-movements. The present study results are consistent with the idea that movement time is the variable associated with changes in sub-movement profiles.

摘要

长期以来的观点认为，针对目标的离散运动由一系列运动单元（子运动）组成，这些运动单元（子运动）在运动控制中具有不同的作用（例如，初始脉冲、纠错和运动终止），具体取决于任务约束（例如，时空要求）。在这里，我们报告了在一系列时空任务标准上对离散运动任务中子运动的普遍性和类型的视觉/无视觉操纵的结果。与时间匹配任务中的无视觉对应物相比，视觉的存在导致更长的运动时间。在时间最小化任务的最高难度指数中观察到类似的视觉效果。导致/需要较长运动时间的条件显示出更多的速度峰值前和速度峰值后类型的子运动，而短运动时间增加了超调子运动的可能性。目前的研究结果与运动时间是与子运动曲线变化相关的变量的观点一致。