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Direction-Specific Iterative Tuning of Motor Commands With Local Generalization During Randomized Reaching Practice Across Movement Directions

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posted on 20.07.2022, 17:33 authored by Pritesh N Parmar, James PattonJames Patton
During motor learning, people often practice reaching in variety of movement directions in a randomized sequence. Such training has been shown to enhance retention and transfer capability of the acquired skill compared to the blocked repetition of the same movement direction. The learning system must accommodate such randomized order either by having a memory for each movement direction, or by being able to generalize what was learned in one movement direction to the controls of nearby directions. While our preliminary study used a comprehensive dataset from visuomotor learning experiments and evaluated the first-order model candidates that considered the memory of error and generalization across movement directions, here we expanded our list of candidate models that considered the higher-order effects and error-dependent learning rates. We also employed cross-validation to select the leading models. We found that the first-order model with a constant learning rate was the best at predicting learning curves. This model revealed an interaction between the learning and forgetting processes using the direction-specific memory of error. As expected, learning effects were observed at the practiced movement direction on a given trial. Forgetting effects (error increasing) were observed at the unpracticed movement directions with learning effects from generalization from the practiced movement direction. Our study provides insights that guide optimal training using the machine-learning algorithms in areas such as sports coaching, neurorehabilitation, and human-machine interactions.

Funding

Error Enhanced Learning & Recovery In 2&3 Dimensions | Funder: Rehabilitation Inst of Chicago | Grant ID: R01NS053606

Enhancing Acquisition and Retention of Novel Motor Skills Using the Optimal Error-Feedback for Robot-Assisted Stroke Rehabilitation | Funder: National Institutes of Health (National Institute of Neurological Disorders and Stroke) | Grant ID: F31NS100520

History

Citation

Parmar, P. N.Patton, J. L. (2021). Direction-Specific Iterative Tuning of Motor Commands With Local Generalization During Randomized Reaching Practice Across Movement Directions. Frontiers in Neurorobotics, 15, 651214-. https://doi.org/10.3389/fnbot.2021.651214

Publisher

Frontiers Media SA

Language

en

issn

1662-5218