Grasp-Based Functional Coupling Between Reach- and Grasp-Related Components of Forelimb Muscle Activity |
| |
| Authors: | Shashwati Geed Peter L. E. van Kan |
| |
| Affiliation: | 1. Department of Kinesiology, University of Wisconsin–Madison, Wisconsin;2. MedStar National Rehabilitation Hospital, Washington, DC;3. Department of Rehabilitation Medicine, Georgetown University Medical Center, Washington, DC |
| |
| 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. |
| |
| Keywords: | grasping motor control multijoint control temporal coupling |
|
|
