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Posture dependent factors influence movement variability when reaching to nearby virtual objects

Reaching movements are subject to noise arising during the sensing, planning and execution phases of movement production, which contributes to movement variability. When vision of the moving hand is available, reach endpoint variability appears to be strongly influenced by internal noise associated...

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Autores principales: Phataraphruk, Preyaporn, Rahman, Qasim, Lakshminarayanan, Kishor, Fruchtman, Mitchell, Buneo, Christopher A.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9641121/
https://www.ncbi.nlm.nih.gov/pubmed/36389217
http://dx.doi.org/10.3389/fnins.2022.971382
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author Phataraphruk, Preyaporn
Rahman, Qasim
Lakshminarayanan, Kishor
Fruchtman, Mitchell
Buneo, Christopher A.
author_facet Phataraphruk, Preyaporn
Rahman, Qasim
Lakshminarayanan, Kishor
Fruchtman, Mitchell
Buneo, Christopher A.
author_sort Phataraphruk, Preyaporn
collection PubMed
description Reaching movements are subject to noise arising during the sensing, planning and execution phases of movement production, which contributes to movement variability. When vision of the moving hand is available, reach endpoint variability appears to be strongly influenced by internal noise associated with the specification and/or online updating of movement plans in visual coordinates. In contrast, without hand vision, endpoint variability appears more dependent upon movement direction, suggesting a greater influence of execution noise. Given that execution noise acts in part at the muscular level, we hypothesized that reaching variability should depend not only on movement direction but initial arm posture as well. Moreover, given that the effects of execution noise are more apparent when hand vision is unavailable, we reasoned that postural effects would be more evident when visual feedback was withheld. To test these hypotheses, participants planned memory-guided reaching movements to three frontal plane targets using one of two initial arm postures (“adducted” or “abducted”), attained by rotating the arm about the shoulder-hand axis. In this way, variability was examined for two sets of movements that were largely identical in endpoint coordinates but different in joint/muscle-based coordinates. We found that patterns of reaching variability differed in several respects when movements were initiated with different arm postures. These postural effects were evident shortly after movement onset, near the midpoints of the movements, and again at the endpoints. At the endpoints, posture dependent effects interacted with effects of visual feedback to determine some aspects of variability. These results suggest that posture dependent execution noise interacts with feedback control mechanisms and biomechanical factors to determine patterns of reach endpoint variability in 3D space.
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spelling pubmed-96411212022-11-15 Posture dependent factors influence movement variability when reaching to nearby virtual objects Phataraphruk, Preyaporn Rahman, Qasim Lakshminarayanan, Kishor Fruchtman, Mitchell Buneo, Christopher A. Front Neurosci Neuroscience Reaching movements are subject to noise arising during the sensing, planning and execution phases of movement production, which contributes to movement variability. When vision of the moving hand is available, reach endpoint variability appears to be strongly influenced by internal noise associated with the specification and/or online updating of movement plans in visual coordinates. In contrast, without hand vision, endpoint variability appears more dependent upon movement direction, suggesting a greater influence of execution noise. Given that execution noise acts in part at the muscular level, we hypothesized that reaching variability should depend not only on movement direction but initial arm posture as well. Moreover, given that the effects of execution noise are more apparent when hand vision is unavailable, we reasoned that postural effects would be more evident when visual feedback was withheld. To test these hypotheses, participants planned memory-guided reaching movements to three frontal plane targets using one of two initial arm postures (“adducted” or “abducted”), attained by rotating the arm about the shoulder-hand axis. In this way, variability was examined for two sets of movements that were largely identical in endpoint coordinates but different in joint/muscle-based coordinates. We found that patterns of reaching variability differed in several respects when movements were initiated with different arm postures. These postural effects were evident shortly after movement onset, near the midpoints of the movements, and again at the endpoints. At the endpoints, posture dependent effects interacted with effects of visual feedback to determine some aspects of variability. These results suggest that posture dependent execution noise interacts with feedback control mechanisms and biomechanical factors to determine patterns of reach endpoint variability in 3D space. Frontiers Media S.A. 2022-10-25 /pmc/articles/PMC9641121/ /pubmed/36389217 http://dx.doi.org/10.3389/fnins.2022.971382 Text en Copyright © 2022 Phataraphruk, Rahman, Lakshminarayanan, Fruchtman and Buneo. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Neuroscience
Phataraphruk, Preyaporn
Rahman, Qasim
Lakshminarayanan, Kishor
Fruchtman, Mitchell
Buneo, Christopher A.
Posture dependent factors influence movement variability when reaching to nearby virtual objects
title Posture dependent factors influence movement variability when reaching to nearby virtual objects
title_full Posture dependent factors influence movement variability when reaching to nearby virtual objects
title_fullStr Posture dependent factors influence movement variability when reaching to nearby virtual objects
title_full_unstemmed Posture dependent factors influence movement variability when reaching to nearby virtual objects
title_short Posture dependent factors influence movement variability when reaching to nearby virtual objects
title_sort posture dependent factors influence movement variability when reaching to nearby virtual objects
topic Neuroscience
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9641121/
https://www.ncbi.nlm.nih.gov/pubmed/36389217
http://dx.doi.org/10.3389/fnins.2022.971382
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