American Society of Biomechanics Journal of Biomechanics Award 2018: Adaptive motor planning of center-of-mass trajectory during goal-directed walking in novel environments

Mary A. Bucklin*, Mengnan/Mary M. Wu, Geoffrey Brown, Keith Edward Gordon

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

To aid in the successful execution of goal-directed walking (discrete movement from a start location to an end target) the central nervous system forms a predictive motor plan. For the motor plan to be effective, it must be adapted in response to environmental changes. Despite motor planning being inherent to goal-directed walking, it is not understood how the nervous system adapts these plans to interact with changing environments. Our objective was to understand how people adapt motor plans of center of mass (COM) trajectory during goal-directed walking in response to a consistent change in environmental dynamics. Participants preformed a series of goal-directed walking trials in a novel environment created by a cable robot that applied a lateral force field to their COM. We hypothesized that participants would adapt to the environment by forming an internal model of their COM trajectory within the force field. Our findings support this hypothesis. Initially, we found COM trajectory significantly deviated in the same direction as the applied field, relative to baseline (no field) (p = 0.002). However, with practice in the field, COM trajectory adapted back to the baseline (p = 0.6). When we unexpectedly removed the field, participants demonstrated after-effects, COM trajectory deviated in the direction opposite of the field relative to baseline (p < 0.001). Our findings suggest that when performing a goal-directed walking task, people adapt a motor plan that predicts the COM trajectory that will emerge from the interaction between a specific set of motor commands and the external environment.

Original languageEnglish (US)
Pages (from-to)5-12
Number of pages8
JournalJournal of Biomechanics
Volume94
DOIs
StatePublished - Sep 20 2019

Fingerprint

Biomechanics
Biomechanical Phenomena
Walking
Trajectories
Planning
Neurology
Nervous System
Central Nervous System
Cables
Robots

Keywords

  • Adaptation
  • Gait
  • Internal model
  • Motor control

ASJC Scopus subject areas

  • Biophysics
  • Orthopedics and Sports Medicine
  • Biomedical Engineering
  • Rehabilitation

Cite this

@article{d7b4d3f76d0844c3ba73b22beb5b8321,
title = "American Society of Biomechanics Journal of Biomechanics Award 2018: Adaptive motor planning of center-of-mass trajectory during goal-directed walking in novel environments",
abstract = "To aid in the successful execution of goal-directed walking (discrete movement from a start location to an end target) the central nervous system forms a predictive motor plan. For the motor plan to be effective, it must be adapted in response to environmental changes. Despite motor planning being inherent to goal-directed walking, it is not understood how the nervous system adapts these plans to interact with changing environments. Our objective was to understand how people adapt motor plans of center of mass (COM) trajectory during goal-directed walking in response to a consistent change in environmental dynamics. Participants preformed a series of goal-directed walking trials in a novel environment created by a cable robot that applied a lateral force field to their COM. We hypothesized that participants would adapt to the environment by forming an internal model of their COM trajectory within the force field. Our findings support this hypothesis. Initially, we found COM trajectory significantly deviated in the same direction as the applied field, relative to baseline (no field) (p = 0.002). However, with practice in the field, COM trajectory adapted back to the baseline (p = 0.6). When we unexpectedly removed the field, participants demonstrated after-effects, COM trajectory deviated in the direction opposite of the field relative to baseline (p < 0.001). Our findings suggest that when performing a goal-directed walking task, people adapt a motor plan that predicts the COM trajectory that will emerge from the interaction between a specific set of motor commands and the external environment.",
keywords = "Adaptation, Gait, Internal model, Motor control",
author = "Bucklin, {Mary A.} and Wu, {Mengnan/Mary M.} and Geoffrey Brown and Gordon, {Keith Edward}",
year = "2019",
month = "9",
day = "20",
doi = "10.1016/j.jbiomech.2019.07.030",
language = "English (US)",
volume = "94",
pages = "5--12",
journal = "Journal of Biomechanics",
issn = "0021-9290",
publisher = "Elsevier Limited",

}

American Society of Biomechanics Journal of Biomechanics Award 2018 : Adaptive motor planning of center-of-mass trajectory during goal-directed walking in novel environments. / Bucklin, Mary A.; Wu, Mengnan/Mary M.; Brown, Geoffrey; Gordon, Keith Edward.

In: Journal of Biomechanics, Vol. 94, 20.09.2019, p. 5-12.

Research output: Contribution to journalArticle

TY - JOUR

T1 - American Society of Biomechanics Journal of Biomechanics Award 2018

T2 - Adaptive motor planning of center-of-mass trajectory during goal-directed walking in novel environments

AU - Bucklin, Mary A.

AU - Wu, Mengnan/Mary M.

AU - Brown, Geoffrey

AU - Gordon, Keith Edward

PY - 2019/9/20

Y1 - 2019/9/20

N2 - To aid in the successful execution of goal-directed walking (discrete movement from a start location to an end target) the central nervous system forms a predictive motor plan. For the motor plan to be effective, it must be adapted in response to environmental changes. Despite motor planning being inherent to goal-directed walking, it is not understood how the nervous system adapts these plans to interact with changing environments. Our objective was to understand how people adapt motor plans of center of mass (COM) trajectory during goal-directed walking in response to a consistent change in environmental dynamics. Participants preformed a series of goal-directed walking trials in a novel environment created by a cable robot that applied a lateral force field to their COM. We hypothesized that participants would adapt to the environment by forming an internal model of their COM trajectory within the force field. Our findings support this hypothesis. Initially, we found COM trajectory significantly deviated in the same direction as the applied field, relative to baseline (no field) (p = 0.002). However, with practice in the field, COM trajectory adapted back to the baseline (p = 0.6). When we unexpectedly removed the field, participants demonstrated after-effects, COM trajectory deviated in the direction opposite of the field relative to baseline (p < 0.001). Our findings suggest that when performing a goal-directed walking task, people adapt a motor plan that predicts the COM trajectory that will emerge from the interaction between a specific set of motor commands and the external environment.

AB - To aid in the successful execution of goal-directed walking (discrete movement from a start location to an end target) the central nervous system forms a predictive motor plan. For the motor plan to be effective, it must be adapted in response to environmental changes. Despite motor planning being inherent to goal-directed walking, it is not understood how the nervous system adapts these plans to interact with changing environments. Our objective was to understand how people adapt motor plans of center of mass (COM) trajectory during goal-directed walking in response to a consistent change in environmental dynamics. Participants preformed a series of goal-directed walking trials in a novel environment created by a cable robot that applied a lateral force field to their COM. We hypothesized that participants would adapt to the environment by forming an internal model of their COM trajectory within the force field. Our findings support this hypothesis. Initially, we found COM trajectory significantly deviated in the same direction as the applied field, relative to baseline (no field) (p = 0.002). However, with practice in the field, COM trajectory adapted back to the baseline (p = 0.6). When we unexpectedly removed the field, participants demonstrated after-effects, COM trajectory deviated in the direction opposite of the field relative to baseline (p < 0.001). Our findings suggest that when performing a goal-directed walking task, people adapt a motor plan that predicts the COM trajectory that will emerge from the interaction between a specific set of motor commands and the external environment.

KW - Adaptation

KW - Gait

KW - Internal model

KW - Motor control

UR - http://www.scopus.com/inward/record.url?scp=85070375730&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85070375730&partnerID=8YFLogxK

U2 - 10.1016/j.jbiomech.2019.07.030

DO - 10.1016/j.jbiomech.2019.07.030

M3 - Article

C2 - 31416592

AN - SCOPUS:85070375730

VL - 94

SP - 5

EP - 12

JO - Journal of Biomechanics

JF - Journal of Biomechanics

SN - 0021-9290

ER -