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A conversion from slow to fast memory in response to passive motion

Mousa Javidialsaadi, Scott T. Albert, Jinsung Wang
doi: https://doi.org/10.1101/2021.03.09.434594
Mousa Javidialsaadi
1Department of Kinesiology, University of Wisconsin – Milwaukee, Milwaukee, WI, 53201
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Scott T. Albert
2Depertment of Biomedical Engineering, Johns Hopkins University – Baltimore, MD 21205
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Jinsung Wang
1Department of Kinesiology, University of Wisconsin – Milwaukee, Milwaukee, WI, 53201
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  • For correspondence: wang34@uwm.edu
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Abstract

When the same perturbation is experienced consecutively, learning is accelerated on the second attempt. This savings is a central property of sensorimotor adaptation. Current models suggest that these improvements in learning are due to changes in the brain’s sensitivity to error. Here, we tested whether these increases in error sensitivity could be facilitated by passive movement experiences. In each experimental group, the robot moved the arm passively in the direction that solved the upcoming rotation, but no visual feedback was provided. Then, following a break in time, participants adapted to a visuomotor rotation. Prior passive movements substantially improved motor learning, increasing total compensation in each group by approximately 30%. Similar to savings, a state-space model suggested that this improvement in learning was due to an increase in error sensitivity, but not memory retention. Thus, passive memories appeared to increase the motor learning system’s sensitivity to error. However, some features in the observed behavior were not captured by this model, nor by similar empirical models, which assumed that learning was due a single exponential process. When we considered the possibility that learning was supported by parallel fast and slow adaptive processes, a striking pattern emerged; whereas initial improvements in learning were driven by a slower adaptive state, increases in error sensitivity gradually transferred to a faster learning system with the passage of time.

Competing Interest Statement

The authors have declared no competing interest.

Footnotes

  • Mousa Javidialsaadi and Scott Albert have contributed equally to this work

Copyright 
The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. All rights reserved. No reuse allowed without permission.
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Posted March 17, 2021.
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A conversion from slow to fast memory in response to passive motion
Mousa Javidialsaadi, Scott T. Albert, Jinsung Wang
bioRxiv 2021.03.09.434594; doi: https://doi.org/10.1101/2021.03.09.434594
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A conversion from slow to fast memory in response to passive motion
Mousa Javidialsaadi, Scott T. Albert, Jinsung Wang
bioRxiv 2021.03.09.434594; doi: https://doi.org/10.1101/2021.03.09.434594

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