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. 2018 Aug 7;12:537. doi: 10.3389/fnins.2018.00537

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Copyright © 2018 Hu, Yang, Chen, Qi, Li, Du and Xie.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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The NMF decomposition model. (A) Two-channel EMG signals V₁ and V₂. (B) The muscle activation model. (B-a) Muscle synergy vector matrices W₁ and W₂. (B-b) Time-varying coefficients C₁ and C₂. (C) Reconstruction signals $V'_{1}$ and $V'_{2}$ .