Citation: Journal of Motor Behavior. 49(3):312-328, 2017 May-Jun..Journal: Journal of motor behavior.Published: ; 2017ISSN: 0022-2895.Full author list: Geed S; van Kan PL.UI/PMID: 27589010.Subject(s): Animals | *Behavior, Animal/ph [Physiology] | *Biomechanical Phenomena/ph [Physiology] | Electromyography | *Forelimb/ph [Physiology] | Macaca mulatta | Male | *Motor Activity/ph [Physiology] | *Muscle, Skeletal/ph [Physiology]Institution(s): MedStar National Rehabilitation NetworkActivity type: Journal Article.Medline article type(s): Journal ArticleDigital Object Identifier: https://dx.doi.org/10.1080/00222895.2016.1204265 (Click here)Abbreviated citation: J Mot Behav. 49(3):312-328, 2017 May-Jun.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.