Grasp-Based Functional Coupling Between Reach- and Grasp-Related Components of Forelimb Muscle Activity.

MedStar author(s):
Citation: Journal of Motor Behavior. 49(3):312-328, 2017 May-Jun.PMID: 27589010Institution: MedStar National Rehabilitation NetworkForm of publication: Journal ArticleMedline article type(s): Journal ArticleSubject headings: *Behavior, Animal/ph [Physiology] | *Biomechanical Phenomena/ph [Physiology] | *Forelimb/ph [Physiology] | *Motor Activity/ph [Physiology] | *Muscle, Skeletal/ph [Physiology] | Animals | Electromyography | Macaca mulatta | MaleYear: 2017ISSN:
  • 0022-2895
Name of journal: Journal of motor behaviorAbstract: How are appropriate combinations of forelimb muscles selected during reach-to-grasp movements in the presence of neuromotor redundancy and important task-related constraints? The authors tested whether grasp type or target location preferentially influence the selection and synergistic coupling between forelimb muscles during reach-to-grasp movements. Factor analysis applied to 14-20 forelimb electromyograms recorded from monkeys performing reach-to-grasp tasks revealed 4-6 muscle components that showed transport/preshape- or grasp-related features. Weighting coefficients of transport/preshape-related components demonstrated strongest similarities for reaches that shared the same grasp type rather than the same target location. Scaling coefficients of transport/preshape- and grasp-related components showed invariant temporal coupling. Thus, grasp type influenced strongly both transport/preshape- and grasp-related muscle components, giving rise to grasp-based functional coupling between forelimb muscles.All authors: Geed S, van Kan PLFiscal year: FY2017Digital Object Identifier: Date added to catalog: 2017-05-24
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Journal Article MedStar Authors Catalog Article 27589010 Available 27589010

How are appropriate combinations of forelimb muscles selected during reach-to-grasp movements in the presence of neuromotor redundancy and important task-related constraints? The authors tested whether grasp type or target location preferentially influence the selection and synergistic coupling between forelimb muscles during reach-to-grasp movements. Factor analysis applied to 14-20 forelimb electromyograms recorded from monkeys performing reach-to-grasp tasks revealed 4-6 muscle components that showed transport/preshape- or grasp-related features. Weighting coefficients of transport/preshape-related components demonstrated strongest similarities for reaches that shared the same grasp type rather than the same target location. Scaling coefficients of transport/preshape- and grasp-related components showed invariant temporal coupling. Thus, grasp type influenced strongly both transport/preshape- and grasp-related muscle components, giving rise to grasp-based functional coupling between forelimb muscles.

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