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Cocontraction in sensorimotor control| old_uid | 8934 |
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| title | Cocontraction in sensorimotor control |
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| start_date | 2010/06/17 |
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| schedule | 13h45 |
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| online | no |
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| location_info | Faculté des sciences du sport, campus de Luminy, salle D207 |
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| summary | Achieving movements with accuracy despite the inevitable variability of the neuromuscular mechanisms is an important everyday life problem, which has to be solved for the production of any adapted motor act, such as walking, writing, catching or pointing. To solve this problem when we have to make goal-directed movements as fast as possible, we systematically increase movement time when accuracy requirements increase, a ubiquitous phenomenon qualified as speed accuracy trade-off. Yet, when movement time is constrained, it has been shown that humans use increased muscle cocontraction to meet high accuracy requirements.
I will present some new results from 3 studies conducted at the Institut des Sciences du Mouvement Etienne Jules Marey, contributing to a better understanding of the role of cocontraction to deal with variability and uncertainty in sensorimotor control.
The first study addresses the question of the co-existence of the two strategies used to deal with movement accuracy constraints, namely movement time modulation and cocontraction modulation. Results of the second study show how cocontraction is regulated online, on the basis of visual information. In the third study, the possibility that cocontraction may be an effective mechanism to face uncertainty in sensory information was considered. Implications of these results for modelling will be discussed. |
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| responsibles | Fenouil |
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