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Asymptotic limits of sensorimotor adaptation

Scott T. Albert, Jihoon Jang, Hannah Sheahan, Lonneke Teunissen, Koenraad Vandevoorde, Reza Shadmehr
doi: https://doi.org/10.1101/868406
Scott T. Albert
1Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore MD
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  • For correspondence: salbert8@jhmi.edu
Jihoon Jang
1Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore MD
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Hannah Sheahan
2Dept. of Experimental Psychology, University of Oxford, Oxford UK
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Lonneke Teunissen
3Donders Institute for Brain, Cognition and Behaviour, Radboud University, Nijmegen Netherlands
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Koenraad Vandevoorde
4Leuven Brain Institute, KU Leuven, Leuven Belgium
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Reza Shadmehr
1Department of Biomedical Engineering, Johns Hopkins School of Medicine, Baltimore MD
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Abstract

In many forms of motor adaptation, performance approaches a limit at which point learning stops, despite the fact that errors remain. What causes this adaptation limit? Here we found that while reach adaptation exhibited an asymptotic limit, this limit was not fixed: when the variance of the perturbation decreased, the adaptation limit increased, and performance improved. Moreover, the limit could be altered in real-time by changing perturbation variance. The same was true at low reaction times, indicating that implicit processes influenced the adaptation limit. Using a mathematical model that describes adaptation as a balance between learning and forgetting, we found that participants altered their adaptation limit by changing their sensitivity to reaching errors. Changes in error sensitivity were linked to the consistency of past errors. These observations suggest that during adaptation, time-varying error sensitivities compete with constant forgetting, setting the boundary conditions that produce an apparent limit in total adaptation.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted December 08, 2019.
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Asymptotic limits of sensorimotor adaptation
Scott T. Albert, Jihoon Jang, Hannah Sheahan, Lonneke Teunissen, Koenraad Vandevoorde, Reza Shadmehr
bioRxiv 868406; doi: https://doi.org/10.1101/868406
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Asymptotic limits of sensorimotor adaptation
Scott T. Albert, Jihoon Jang, Hannah Sheahan, Lonneke Teunissen, Koenraad Vandevoorde, Reza Shadmehr
bioRxiv 868406; doi: https://doi.org/10.1101/868406

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