Decomposition of variability in the execution of goal-oriented tasks:: Three components of skill improvement
Decomposition of variability in the execution of goal-oriented tasks:: Three components of skill improvement
复制标题
DOI：
10.1037/0096-1523.30.1.212
复制
发表时间：
2004-02-01
影响因子：
2.1
通讯作者：
Sternad, D
中科院分区：
文献类型：
--
作者：
Müller, H;Sternad, D
运动系统的一个核心能力是以极大的可靠性实现目标，尽管从来没有零变异性。有人认为，可变性是减少与实践的3个独立的手段：减少随机噪声（N），利用任务容忍度（7），和中央变量之间的协变（C）。提出了一种方法，分解成这些组件的变化，任务空间是由执行变量定义。成功的变量组合形成了解的流形。在一个虚拟的九柱游戏任务中，它表明，参与者的改善重复，增加准确性，是占N，T。在较小程度上，C.这些成分的相对贡献随着练习和任务的变化而变化。
A central ability of the motor system is to achieve goals with great reliability, although never with zero variability. It is argued that variability is reduced with practice by 3 separate means: reduction of stochastic noise (N), exploitation of task tolerance (7), and covariation (C) between central variables. A method is presented that decomposes variability into these components in relation to task space that is defined by the execution variables. Successful variable combinations form the solution manifold. In a virtual skittles task, it is demonstrated that participants' improvement over repetitions, indicated by increasing accuracy, is accounted for by N, T. and, to a lesser degree, C. The relative contribution of these components changes over the course of practice and task variations.