During the previous period of support, we have introduced, explored, and developed an approach to motor synergies based on the principle of abundance and using the computational tools of the uncontrolled manifold hypothesis. Now we suggest focusing on three major goals. First, we plan to analyze interaction of synergies at different levels of a control hierarchy. Second, we will explore the purposes and benefits of using synergic control to move closer to application of these ideas to everyday movements and disordered movements. Third, we will explore differences between the synergies involved in two basic classes of actions, discrete and cyclic. The planned experiments will address the following main questions: What is the purpose of synergies? How do synergies at different levels of a control hierarchy interact with each other? Are there qualitative differences in the synergic mechanisms during cyclic and discrete actions? We will perform eight experiments using several of the novel experimental devices constructed in our group, such as the """"""""inverse piano"""""""", the """"""""collapsing cup"""""""", and the """"""""handle with spring-loaded sensors"""""""". Each experiment will test 2-4 specific hypotheses. The long-term goal of this research is to develop a coherent theoretical view on and advance the current understanding of how natural multieffector human movements are controlled and coordinated. Developing such a view would have a profound impact on the practice of preventing and treating motor disorders. These studies will also contribute to developing a toolbox to study motor synergies during both unimpaired and disordered movements.
The overarching goal of the proposed research is to advance the current understanding of the organization, purposes, and benefits of synergic control of movements. We plan to move closer to application of these ideas to everyday motor tasks and disordered movements. At the same time, we are developing a toolbox to study motor synergies;such a toolbox may be applied to both unimpaired and disordered movements.
|Latash, Mark L (2018) Stability of Kinesthetic Perception in Efferent-Afferent Spaces: The Concept of Iso-perceptual Manifold. Neuroscience 372:97-113|
|Furmanek, Mariusz P; Solnik, Stanis?aw; Piscitelli, Daniele et al. (2018) Synergies and Motor Equivalence in Voluntary Sway Tasks: The Effects of Visual and Mechanical Constraints. J Mot Behav 50:492-509|
|Parsa, Behnoosh; Terekhov, Alexander; Zatsiorsky, Vladimir M et al. (2017) Optimality and stability of intentional and unintentional actions: I. Origins of drifts in performance. Exp Brain Res 235:481-496|
|Singh, Tarkeshwar; Ambike, Satyajit (2017) A soft-contact model for computing safety margins in human prehension. Hum Mov Sci 55:307-314|
|Solnik, Stanislaw; Qiao, Mu; Latash, Mark L (2017) Effects of visual feedback and memory on unintentional drifts in performance during finger-pressing tasks. Exp Brain Res 235:1149-1162|
|Parsa, Behnoosh; Zatsiorsky, Vladimir M; Latash, Mark L (2017) Optimality and stability of intentional and unintentional actions: II. Motor equivalence and structure of variance. Exp Brain Res 235:457-470|
|Reschechtko, Sasha; Zatsiorsky, Vladimir M; Latash, Mark L (2017) The synergic control of multi-finger force production: stability of explicit and implicit task components. Exp Brain Res 235:1-14|
|Falaki, Ali; Huang, Xuemei; Lewis, Mechelle M et al. (2017) Motor equivalence and structure of variance: multi-muscle postural synergies in Parkinson's disease. Exp Brain Res 235:2243-2258|
|Piscitelli, Daniele; Falaki, Ali; Solnik, Stanislaw et al. (2017) Anticipatory postural adjustments and anticipatory synergy adjustments: preparing to a postural perturbation with predictable and unpredictable direction. Exp Brain Res 235:713-730|
|Falaki, Ali; Huang, Xuemei; Lewis, Mechelle M et al. (2017) Dopaminergic modulation of multi-muscle synergies in postural tasks performed by patients with Parkinson's disease. J Electromyogr Kinesiol 33:20-26|
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