Bimanual grasp planning reflects changing rather than fixed constraint dominance.

Experimental Brain Research
Robrecht P R D van der Wel, D A Rosenbaum

Abstract

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 mechanis...Continue Reading

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Citations

Apr 13, 2011·Experimental Brain Research·Charmayne M L HughesJoong Hyun Ryu
May 9, 2012·Experimental Brain Research·Charmayne M L HughesChristoph Schütz
Jun 4, 2013·Experimental Brain Research·Christoph Schütz, Thomas Schack
Sep 18, 2013·Experimental Brain Research·David Dignath, Andreas B Eder
Sep 7, 2013·Journal of Motor Behavior·Charmayne M L Hughes, Christian Seegelke
Aug 23, 2011·PloS One·Helene M SistiStephan P Swinnen
Sep 5, 2013·Psychonomic Bulletin & Review·Kenneth F Valyear, Scott H Frey
Feb 19, 2014·Experimental Brain Research·Oliver HerbortWilfried Kunde
Aug 28, 2014·Experimental Brain Research·John M HuhnRobrecht P van der Wel
Mar 1, 2011·Research in Developmental Disabilities·Loes Janssen, Bert Steenbergen
Mar 14, 2016·Cognition·John M HuhnDavid A Rosenbaum
Jun 14, 2015·Experimental Brain Research·Christian SeegelkeMatthias Weigelt
Feb 26, 2015·Frontiers in Psychology·Andrea H Mason, Pamela J Bryden
Jan 8, 2015·Frontiers in Psychology·Christian SeegelkeThomas Schack

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