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| Research article summary (published 30 Oct 2002): |
Children's coordination of force output in a pinch grip task.
Full Abstract
This study examined the role of sensorimotor system noise in the organization of the force output of the thumb and index finger and the coordination between the two digits in an isometric pinch grip force task as a function of age (6, 8, 10, 18-22 years), feedback condition (with and without visual feedback information), and force level (5, 15, 25, and 35% of maximal voluntary force. With increases in age under the visual feedback conditions, the signal-to-noise ratio increased, the sequential structure of the force output signals became more irregular, the degree of coherence between the digits at higher force levels was enhanced, and the digits exhibited a greater degree of coherence across the higher frequencies of the power spectrum at all force levels. However, these age differences were either minimized or eliminated under conditions without feedback. These findings show that the age-related performance differences in grip force variability are primarily due to more effective use of visual information rather than age differences in intrinsic sensorimotor noise.Copyright 2002 Wiley Periodicals, Inc.
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Author information
Author/s: Deutsch, Katherine M (KM); Newell, Karl M (KM);
Affiliation: Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA.
Journal and publication information
Publication Type: Journal Article
Journal: Developmental psychobiology (Dev Psychobiol), published in United States. (Language: eng)
Reference: 2002-Nov; vol 41 (issue 3) : pp 253-64
Dates: Created 2002/09/26; Completed 2003/01/16; Revised 2004/11/17;
PMID: 12325140, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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