Optimality, stochasticity, and variability in motor behavior.

Full Abstract

Recent theories of motor control have proposed that the nervous system acts as a stochastically optimal controller, i.e. it plans and executes motor behaviors taking into account the nature and statistics of noise. Detrimental effects of noise are converted into a principled way of controlling movements. Attractive aspects of such theories are their ability to explain not only characteristic features of single motor acts, but also statistical properties of repeated actions. Here, we present a critical analysis of stochastic optimality in motor control which reveals several difficulties with this hypothesis. We show that stochastic control may not be necessary to explain the stochastic nature of motor behavior, and we propose an alternative framework, based on the action of a deterministic controller coupled with an optimal state estimator, which relieves drawbacks of stochastic optimality and appropriately explains movement variability.

Author information

Author/s: Guigon, Emmanuel (E); Baraduc, Pierre (P); Desmurget, Michel (M);

Affiliation: INSERM U742, ANIM, Université Pierre et Marie Curie (UPMC Paris 6), 9, quai Saint-Bernard, 75005, Paris, France. guigon(-atsign-)ccr.jussieu.fr

Journal and publication information

Publication Type: Journal Article

Journal: Journal of computational neuroscience (J Comput Neurosci), published in United States. (Language: eng)

Reference: 2008-Feb; vol 24 (issue 1) : pp 57-68

Dates: Created 2008/01/18; Completed 2008/04/11; Revised 2008/11/20;

PMID: 18202922, status: MEDLINE (last retrieval date: 2/18/2009, IMS Date: )

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