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Understanding Mechanisms of Generalization Following Locomotor Adaptation

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Title: Understanding Mechanisms of Generalization Following Locomotor Adaptation
Language: English
Authors: Cristina Rossi, Ryan T. Roemmich, Amy J. Bastian (ORCID 0000-0001-6079-0997)
Source: npj Science of Learning. 2024 9.
Availability: Nature Portfolio. Available from: Springer Nature. One New York Plaza, Suite 4600, New York, NY 10004. Tel: 800-777-4643; Tel: 212-460-1500; Fax: 212-460-1700; e-mail: customerservice@springernature.com; Web site: https://www.nature.com/npjscilearn/
Peer Reviewed: Y
Page Count: 16
Publication Date: 2024
Sponsoring Agency: National Institutes of Health (NIH) (DHHS)
Contract Number: 5R37NS090610
Document Type: Journal Articles
Reports - Research
Descriptors: Generalization, Psychomotor Skills, Physical Activities, Pattern Recognition, Adjustment (to Environment), Environmental Influences, Human Body
DOI: 10.1038/s41539-024-00258-2
ISSN: 2056-7936
Abstract: Our nervous system has the remarkable ability to adapt our gait to accommodate changes in our body or surroundings. However, our adapted walking patterns often generalize only partially (or not at all) between different contexts. Here, we sought to understand how the nervous system generalizes adapted gait patterns from one context to another. Through a series of split-belt treadmill walking experiments, we evaluated different mechanistic hypotheses to explain the partial generalization of adapted gait patterns from split-belt treadmill to overground walking. In support of the credit assignment hypothesis, our experiments revealed the central finding that adaptation involves recalibration of two distinct forward models. Recalibration of the first model generalizes to overground walking, suggesting that the model represents the general movement dynamics of our body. On the other hand, recalibration of the second model does not generalize to overground walking, suggesting the model represents dynamics specific to treadmill walking. These findings reveal that there is a predefined portion of forward model recalibration that generalizes across context, leading to overall partial generalization of walking adaptation.
Abstractor: As Provided
Entry Date: 2024
Accession Number: EJ1432557
Database: ERIC
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  Data: Our nervous system has the remarkable ability to adapt our gait to accommodate changes in our body or surroundings. However, our adapted walking patterns often generalize only partially (or not at all) between different contexts. Here, we sought to understand how the nervous system generalizes adapted gait patterns from one context to another. Through a series of split-belt treadmill walking experiments, we evaluated different mechanistic hypotheses to explain the partial generalization of adapted gait patterns from split-belt treadmill to overground walking. In support of the credit assignment hypothesis, our experiments revealed the central finding that adaptation involves recalibration of two distinct forward models. Recalibration of the first model generalizes to overground walking, suggesting that the model represents the general movement dynamics of our body. On the other hand, recalibration of the second model does not generalize to overground walking, suggesting the model represents dynamics specific to treadmill walking. These findings reveal that there is a predefined portion of forward model recalibration that generalizes across context, leading to overall partial generalization of walking adaptation.
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