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Article Dans Une Revue Frontiers in Computational Neuroscience Année : 2013

''Quantitative evaluation of muscle synergy models: a single-trial task decoding approach''

Résumé

''Muscle synergies, i.e., invariant coordinated activations of groups of muscles, have been proposed as building blocks that the central nervous system (CNS) uses to construct the patterns of muscle activity utilized for executing movements . Several efficient dimensionality reduction algorithms that extract putative synergies from electromyographic (EMG) signals have been developed. Typically, the quality of synergy decompositions is assessed by computing the Variance Accounted For (VAF). Yet, little is known about the extent to which the combination of those synergies en codes task discriminating variations of muscle activity in individual trials. To address this question, here we conceive and develop an ovel computational framework to evaluate muscle synergy decompositions in task space. Unlike previous methods considering the total variance of muscle patterns (VAF based metrics), our approach focuses on variance discriminating execution of different tasks. The procedure is based on single-trial task decoding from muscle synergy activation features. The task decoding based metric evaluates quantitatively the mapping between synergy recruitment and task identification and automatically determines the minimal number of synergies that captures all the task discriminating variability in the synergy activations. In this paper, we first validate the method on plausibly simulated EMG datasets. We then show that it can be applied to different types of muscle synergy decomposition and illustrate its applicability to real data by using it for the analysis of EMG recordings during an arm pointing task. We find that time varying and synchronous synergies with similar number of parameters are equally efficient in task decoding, suggesting that in this experimental paradigm they are equally valid representations of muscle synergies. Overall, these findings stress the effectiveness of the decoding metric in systematically assessing muscle synergy decompositions in task space.''

Dates et versions

hal-00869063 , version 1 (03-10-2013)

Identifiants

Citer

Ioannis Delis, Bastien Berret, Thierry Pozzo, Stefano Panzeri. ''Quantitative evaluation of muscle synergy models: a single-trial task decoding approach''. Frontiers in Computational Neuroscience, 2013, 7, pp.8. ⟨10.3389/fncom.2013.00008⟩. ⟨hal-00869063⟩
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