Schmidt R C, Treffner P J, Shaw B K, Turvey M T
Center for the Ecological Study of Perception and Action, University of Connecticut, Storrs, USA.
J Mot Behav. 1992 Mar;24(1):67-83. doi: 10.1080/00222895.1992.9941602.
Learning a bimanual rhythmic task is explored from the perspective that motor skill acquisition involves the successive reparameterization of a dynamical control structure in the direction of increasing stability, where the intentional process of reparameterization is itself dynamical. Subjects learned to oscillate pendulums held in the right and left hands such that the right hand frequency was twice that of the left (2:1 frequency lock). Over 12 learning sessions of 20 trials each, we interpreted the decreasing fluctuations in the frequency locking to be an index of the increasing concavity of the underlying potential, a measure of stability; the time required to achieve the 2: 1 pattern was interpreted as indexing the relaxation time of an intentional dynamic. Power spectral analyses of the phase velocity ratio exhibited two strategies for acquiring the interlimb movement pattern: (a) adding spectral peaks at integer multiples of the left hand frequency or (b) distributing power across many frequencies in a l/f-like manner. Results are discussed in terms of the promise of a dynamical approach to learning coordinated movements.
从运动技能习得涉及动态控制结构朝着稳定性增强的方向进行连续重新参数化这一角度出发，对学习双手节律性任务进行了探究，其中重新参数化的意向性过程本身也是动态的。受试者学习使分别握在右手和左手的摆锤摆动，使得右手的频率是左手的两倍（2:1频率锁定）。在每次包含20次试验的12次学习过程中，我们将频率锁定中波动的减少解释为潜在势能凹度增加的指标，凹度是稳定性的一种度量；实现2:1模式所需的时间被解释为意向性动态的弛豫时间指标。对相速度比的功率谱分析展示了两种获取肢体间运动模式的策略：(a) 在左手频率的整数倍处添加谱峰，或者(b) 以类似1/f的方式在多个频率上分布功率。根据动态方法在学习协调运动方面的前景对结果进行了讨论。
