Practice effects on local and global dynamics of the ski-simulator task

This experiment examined the acquisition of the global and local dynamics of the changes in the total body center of mass-platform and inter-limb coordination motions over the course of practice (20, 30 s trials each day for 7 days) in the ski-simulator task. Four blocks of trials, representative of...

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Bibliographic Details
Published in:Experimental brain research 2006-03, Vol.169 (3), p.350-360
Main Authors: HONG, S. L, NEWELL, K. M
Format: Article
Language:English
Subjects:
Adolescent
Adult
Analysis of Variance
Audition
Biological and medical sciences
Biomechanical Phenomena
Computer Simulation
Female
Fundamental and applied biological sciences. Psychology
Humans
Knee Joint - physiology
Male
Motor control and motor pathways. Reflexes. Control centers of vegetative functions. Vestibular system and equilibration
Motor Skills - physiology
Nonlinear Dynamics
Perception
Postural Balance - physiology
Practice (Psychology)
Psychology. Psychoanalysis. Psychiatry
Psychology. Psychophysiology
Skiing - education
Skiing - physiology
Spectrum Analysis
Vertebrates: nervous system and sense organs
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Summary:This experiment examined the acquisition of the global and local dynamics of the changes in the total body center of mass-platform and inter-limb coordination motions over the course of practice (20, 30 s trials each day for 7 days) in the ski-simulator task. Four blocks of trials, representative of early, moderate, and extensive practice were analyzed through power spectrum and coherence analyses. The oscillation frequencies of the knee joints became tuned to that of the platform-performer system and there were changes due to practice in the lower inter-limb coordination dynamics independent of the center of mass and platform coordination pattern. Acquisition of global level dynamics occurs to achieve a stable task solution that can allow for degenerate frequency- and phase-locking of the mechanical degrees of freedom at both the local intra- and inter-limb levels.
ISSN:0014-4819
1432-1106
DOI:10.1007/s00221-005-0145-4