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Kinematic features of continuous hand reaching movements under simple and complex rhythmical constraints
Krasovsky
T
author
Berman
S
author
Liebermann
D
G
author
2010
English
BACKGROUND: Auditory cues are known to alter movement kinematics in healthy people as well as in people with neurological conditions (e.g., Parkinson's disease or stroke). Pacing movement to rhythmical constraints is known to change both the spatial and temporal features of movement. However, the effect of complexity of pacing on the spatial and temporal kinematic properties is still poorly understood. The current study investigated spatial and temporal aspects of movement (path and speed, respectively) and their integration while subjects followed simple isochronous or complex non-isochronous rhythmical constraints. Spatiotemporal decoupling was expected under the latter constraint. METHODS: Ten subjects performed point-to-point hand movements towards visual targets on the surface of a hemisphere, while following continuous auditory cues of different pace and meter. The spatial and temporal properties of movement were compared to geodesic paths and unimodal bell-shaped speed profiles, respectively. Multiple two-way RM-ANOVAs (pace [1-2 Hz] x meter [duple-triple]) were performed on the different kinematic variables calculated to assess hand deviations from the model data (p< or = 0.05). RESULTS: As expected, increasing pace resulted in straighter hand paths and smoother speed profiles. Meter, however, affected only the path (shorter and straighter under triple) without significantly changing speed. Such an effect was observed at the slow pace only. CONCLUSIONS: Under simple rhythmic cues, an increase in pace causes spontaneous adjustments in spatial features (straighter hand paths) while preserving temporal ones (maximally-smoothed hand speeds). Complex rhythmical cues in contrast perturb spatiotemporal coupling and challenge movement control. These results may have important practical implications in motor rehabilitation.
*Acoustic Stimulation
Adult
Biomechanics
*Cues
Female
Hand/*physiology
Humans
Male
Movement/*physiology
PMID:20382031
exported from refbase (https://refbase.nfshost.com/show.php?record=32), last updated on Mon, 31 Dec 2012 14:29:06 +0000
text
http://www.ncbi.nlm.nih.gov/pubmed/20382031
http://www.ncbi.nlm.nih.gov/pubmed/20382031
10.1016/j.jelekin.2010.03.003
20382031
Krasovsky_etal2010
Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
J Electromyogr Kinesiol
2010
continuing
periodical
academic journal
20
4
636
641
1050-6411
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