| The use of peripheral vision to guide perturbation-evoked reach-to-grasp balance-recovery reactions. | |
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MedLine Citation:
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PMID: 20957351 Owner: NLM Status: In-Process |
Abstract/OtherAbstract:
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For a reach-to-grasp reaction to prevent a fall, it must be executed very rapidly, but with sufficient accuracy to achieve a functional grip. Recent findings suggest that the CNS may avoid potential time delays associated with saccade-guided arm movements by instead relying on peripheral vision (PV). However, studies of volitional arm movements have shown that reaching is slower and/or less accurate when guided by PV, rather than central vision (CV). The present study investigated how the CNS resolves speed-accuracy trade-offs when forced to use PV to guide perturbation-evoked reach-to-grasp balance-recovery reactions. These reactions were evoked, in 12 healthy young adults, via sudden unpredictable antero-posterior platform translation (barriers deterred stepping reactions). In PV trials, subjects were required to look straight-ahead at a visual target while a small cylindrical handhold (length 25%> hand-width) moved intermittently and unpredictably along a transverse axis before stopping at a visual angle of 20°, 30°, or 40°. The perturbation was then delivered after a random delay. In CV trials, subjects fixated on the handhold throughout the trial. A concurrent visuo-cognitive task was performed in 50% of PV trials but had little impact on reach-to-grasp timing or accuracy. Forced reliance on PV did not significantly affect response initiation times, but did lead to longer movement times, longer time-after-peak-velocity and less direct trajectories (compared to CV trials) at the larger visual angles. Despite these effects, forced reliance on PV did not compromise ability to achieve a functional grasp and recover equilibrium, for the moderately large perturbations and healthy young adults tested in this initial study. |
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Authors:
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Emily C King; Sandra M McKay; Kenneth C Cheng; Brian E Maki |
Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2010-10-19 |
Journal Detail:
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Title: Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale Volume: 207 ISSN: 1432-1106 ISO Abbreviation: Exp Brain Res Publication Date: 2010 Nov |
Date Detail:
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Created Date: 2010-10-27 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0043312 Medline TA: Exp Brain Res Country: Germany |
Other Details:
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Languages: eng Pagination: 105-18 Citation Subset: IM |
Affiliation:
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Centre for Studies in Aging, Sunnybrook Health Sciences Centre, Toronto, ON, Canada. Emily.King@UToronto.ca |
Export Citation:
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Descriptor/Qualifier:
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| Grant Support | |
ID/Acronym/Agency:
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#MOP-13355//Canadian Institutes of Health Research; 13355//Canadian Institutes of Health Research |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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