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Bimanual grasp planning reflects changing rather than fixed constraint dominance

We studied whether motor-control constraints for grasping objects that are moved to new positions reflect a rigid constraint hierarchy or a flexible constraint hierarchy. In two experiments, we asked participants to move two plungers from the same start locations to different target locations (both...

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Detalles Bibliográficos
Autores principales: van der Wel, Robrecht P. R. D., Rosenbaum, David A.
Formato: Texto
Lenguaje:English
Publicado: Springer-Verlag 2010
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2923322/
https://www.ncbi.nlm.nih.gov/pubmed/20658129
http://dx.doi.org/10.1007/s00221-010-2368-2
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author van der Wel, Robrecht P. R. D.
Rosenbaum, David A.
author_facet van der Wel, Robrecht P. R. D.
Rosenbaum, David A.
author_sort van der Wel, Robrecht P. R. D.
collection PubMed
description We studied whether motor-control constraints for grasping objects that are moved to new positions reflect a rigid constraint hierarchy or a flexible constraint hierarchy. In two experiments, we asked participants to move two plungers from the same start locations to different target locations (both high, both low, or one high and one low). We found that participants grasped the plungers symmetrically and at heights that ensured comfortable or easy-to-control end postures when the plungers had the same target heights, but these grasp tendencies were reduced when the plungers had different target heights. In addition, when the plungers had different mass distributions, participants behaved in ways that suggested still-different emphases of the relevant grasp constraints. When the plungers had different mass distributions, participants sacrificed bimanual symmetry for end-state comfort. The results suggest that bimanual grasp planning relies on a flexible rather than static hierarchy. Different constraints take on different degrees of importance depending on the nature of the task and on the level of task experience. The results have implications for the understanding of perceptual-motor skill learning. It may be that one mechanism underlying such learning is changing the priorities of task constraints.
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spelling pubmed-29233222010-09-09 Bimanual grasp planning reflects changing rather than fixed constraint dominance van der Wel, Robrecht P. R. D. Rosenbaum, David A. Exp Brain Res Research Article We studied whether motor-control constraints for grasping objects that are moved to new positions reflect a rigid constraint hierarchy or a flexible constraint hierarchy. In two experiments, we asked participants to move two plungers from the same start locations to different target locations (both high, both low, or one high and one low). We found that participants grasped the plungers symmetrically and at heights that ensured comfortable or easy-to-control end postures when the plungers had the same target heights, but these grasp tendencies were reduced when the plungers had different target heights. In addition, when the plungers had different mass distributions, participants behaved in ways that suggested still-different emphases of the relevant grasp constraints. When the plungers had different mass distributions, participants sacrificed bimanual symmetry for end-state comfort. The results suggest that bimanual grasp planning relies on a flexible rather than static hierarchy. Different constraints take on different degrees of importance depending on the nature of the task and on the level of task experience. The results have implications for the understanding of perceptual-motor skill learning. It may be that one mechanism underlying such learning is changing the priorities of task constraints. Springer-Verlag 2010-07-24 2010 /pmc/articles/PMC2923322/ /pubmed/20658129 http://dx.doi.org/10.1007/s00221-010-2368-2 Text en © The Author(s) 2010 https://creativecommons.org/licenses/by-nc/4.0/ This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
spellingShingle Research Article
van der Wel, Robrecht P. R. D.
Rosenbaum, David A.
Bimanual grasp planning reflects changing rather than fixed constraint dominance
title Bimanual grasp planning reflects changing rather than fixed constraint dominance
title_full Bimanual grasp planning reflects changing rather than fixed constraint dominance
title_fullStr Bimanual grasp planning reflects changing rather than fixed constraint dominance
title_full_unstemmed Bimanual grasp planning reflects changing rather than fixed constraint dominance
title_short Bimanual grasp planning reflects changing rather than fixed constraint dominance
title_sort bimanual grasp planning reflects changing rather than fixed constraint dominance
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2923322/
https://www.ncbi.nlm.nih.gov/pubmed/20658129
http://dx.doi.org/10.1007/s00221-010-2368-2
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