Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802-6501, USA.
Neurosci Lett. 2010 Jan 29;469(3):416-20. doi: 10.1016/j.neulet.2009.12.041. Epub 2009 Dec 23.
We examined the role of motor learning in influencing the utilization of path redundancy in an interception task. Participants used a pen on a digitizing tablet with the goal of moving to intercept a stationary target shown on a computer screen. Concurrent visual feedback of the cursor and knowledge of results were provided. The changes in spatial variability after extended practice and the correlations between spatial locations on the path were consistent with the view that path redundancy was utilized. However, paths also became less variable with practice, indicating that less of the solution space was utilized. There was also a sequential relation in the movement paths from trial to trial with a tendency to use more similar movement paths on successive trials. These results show that models that account for both redundancy and invariance may be better able to capture the changes in variability with learning. Further, the sequential dependence in the paths suggests that the exploration of redundant solutions is a systematic search process.
我们考察了运动学习在多大程度上影响了在拦截任务中对路径冗余的利用。参与者使用笔在数位板上操作，目的是移动到电脑屏幕上显示的一个静止目标处。同时提供光标位置的视觉反馈和结果信息。经过长时间的练习，路径的空间变异性发生了变化，并且路径上各位置之间存在相关性，这与利用路径冗余的观点是一致的。然而，随着练习的进行，路径的变异性也会降低，这表明解决方案空间的利用程度降低了。此外，在连续的试验中，运动路径也存在序列关系，即连续试验中更倾向于使用相似的运动路径。这些结果表明，同时考虑冗余性和不变性的模型可能更能捕捉到学习过程中变异性的变化。此外，路径中的序列依赖性表明，对冗余解决方案的探索是一种系统的搜索过程。
