A limited set of muscle synergies for force control during a postural task.

Abstract:

:Recently developed computational techniques have been used to reduce muscle activation patterns of high complexity to a simple synergy organization and to bring new insights to the long-standing degrees of freedom problem in motor control. We used a nonnegative factorization approach to identify muscle synergies during postural responses in the cat and to examine the functional significance of such synergies for natural behaviors. We hypothesized that the simplification of neural control afforded by muscle synergies must be matched by a similar reduction in degrees of freedom at the biomechanical level. Electromyographic data were recorded from 8-15 hindlimb muscles of cats exposed to 16 directions of support surface translation. Results showed that as few as four synergies could account for >95% of the automatic postural response across all muscles and all directions. Each synergy was activated for a specific set of perturbation directions, and moreover, each was correlated with a unique vector of endpoint force under the limb. We suggest that, within the context of active balance control, postural synergies reflect a neural command signal that specifies endpoint force of a limb.

journal_name

J Neurophysiol

authors

Ting LH,Macpherson JM

doi

10.1152/jn.00681.2004

subject

Has Abstract

pub_date

2005-01-01 00:00:00

pages

609-13

issue

1

eissn

0022-3077

issn

1522-1598

pii

00681.2004

journal_volume

93

pub_type

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