Learning to perform a novel movement pattern using haptic guidance: slow learning, rapid forgetting, and attractor paths

J. Liu, J. Emken, Steven C. Cramer, D. Reinkensmeyer
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引用次数: 22

Abstract

Mechanical guidance is a common technique to teach patients desired movement patterns during motor rehabilitation, but little is known about the motor learning processes involved with this technique. In this study we examined how well unimpaired subjects could learn to trace a novel path after they practiced it with mechanical guidance from a robot. The form of haptic guidance used was a virtual channel that constrained the hand to follow the desired path (a snake-like curve). Subjects substantially improved their ability to trace the path following practice with haptic guidance, relative to their performance following an initial visual demonstration. They slowly improved their performance with more haptic training. However, when asked to reproduce the path repeatedly, their performance degraded over the course of a few trials. The tracing errors were not random, but instead were consistent with a systematic evolution toward another path, as if being drawn to an "attractor path". These results suggest that haptic demonstration can improve short-term performance of a novel desired trajectory. However, in the short term, the motor system is inclined to repeat its mistakes following just a few movements without guidance.
学习使用触觉引导执行一种新的运动模式:慢速学习、快速遗忘和吸引路径
在运动康复过程中,机械指导是一种常见的技术,用于教授患者所需的运动模式,但人们对这种技术所涉及的运动学习过程知之甚少。在这项研究中,我们考察了未受损的受试者在机器人的机械引导下练习追踪新路径后的表现。使用的触觉引导形式是一个虚拟通道,它约束手遵循期望的路径(蛇形曲线)。与最初的视觉演示相比,受试者在触觉指导下追踪路径的能力得到了显著提高。通过更多的触觉训练,他们慢慢地提高了自己的表现。然而,当被要求反复重现这条路径时,它们的表现在几次试验之后就下降了。追踪错误不是随机的,而是与另一条路径的系统进化相一致,就好像被吸引到一条“吸引子路径”上一样。这些结果表明,触觉演示可以改善新的期望轨迹的短期性能。然而,在短期内,在没有指导的情况下,运动系统倾向于重复它的错误。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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