title: Grasp-Based Functional Coupling Between Reach- and Grasp-Related Components of Forelimb Muscle Activity.
abstract: 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.
authors: a Department of Kinesiology , University of Wisconsin-Madison , Wisconsin.|b MedStar National Rehabilitation Hospital , Washington , DC.|c Department of Rehabilitation Medicine , Georgetown University Medical Center , Washington , DC.
authors: Shashwati
authors: S
authors: Geed
authors: a Department of Kinesiology , University of Wisconsin-Madison , Wisconsin.
authors: Peter L E
authors: PLE
authors: van Kan
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000502:physiology*; D001696:Biomechanical Phenomena / Q000502:physiology*; D004576:Electromyography; D005552:Forelimb / Q000502:physiology*; D008253:Macaca mulatta; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D018482:Muscle, Skeletal / Q000502:physiology*
keywords: grasping; motor control; multijoint control; temporal coupling