Prehension synergies in the grasps with complex friction patterns: local versus synergic effects and the template control.

Prehension synergies in the grasps with complex friction patterns: local versus synergic effects and the template control. Research Abstract Details 

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Prehension synergies in the grasps with complex friction patterns: local versus synergic effects and the template control. Abstract Text:

Xun Niu,Mark L Latash,Vladimir M Zatsiorsky,

We studied adjustments of digit forces to changes in the friction. The subjects held a handle statically in a three-digit grasp. The friction under each digit was either high or low, resulting in eight three-element friction sets (such grasps were coined the grasps with complex friction pattern). The total load was also manipulated. It was found that digit forces were adjusted not only to the supported load and local friction, but also to friction at other digits (synergic effects). When friction under a digit was low, its tangential force decreased and the normal force increased (local effects). The synergic effects were directed to maintain the equilibrium of the handle. The relation between the individual digit forces and loads agreed with the triple-product model: f(i)(n) = k(i)((2))k(i)((1))L, where f(i)(n) is normal force of digit i, L is the load (newtons), k(i)((1)) is a dimensionless coefficient representing sharing the total tangential force among the digits (summation operator k(i)((1)) = 1.0), and k(i)((2)) is a coefficient representing the relation between the tangential and normal forces of digit i (the overall friction equivalent, OFE). At each friction set, the central controller selected the grasping template -- a three-element array of k(i)((2))k(i)((1)) products -- and then scaled the template with the load magnitude.

Prehension synergies in the grasps with complex friction patterns: local versus synergic effects and the template control. Publishing Authors By Initials

X Niu,ML Latash,VM Zatsiorsky,

For similar natural sciences: weights and measures research abstracts see: natural sciences: weights and measures research

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Prehension synergies in the grasps with complex friction patterns: local versus synergic effects and the template control. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Journal of neurophysiology

VOLUME: 98

Page Numbers: 16-28

Journal Abbreviation: J. Neurophysiol.

ISSN: 0022-3077

DAY: 9

MONTH: 05

YEAR: 2007

Prehension synergies in the grasps with complex friction patterns: local versus synergic effects and the template control. Information

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LANGUAGE: eng

NlmUniqueID: 375404

Prehension synergies in the grasps with complex friction patterns: local versus synergic effects and the template control. Keywords Mesh Terms:

KEYWORDS: Weights and Measures

MESH TERMS: physiology

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Grant and Affiliation Information for Prehension synergies in the grasps with complex friction patterns: local versus synergic effects and the template control.

AFFILIATION: Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA.

Country: United States

AGENCY: United States NINDS

GRANT: NS35032

ACRONYM: NS

MEDLINETA: J Neurophysiol

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