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Procedure to extract MS from the NNMF multiplicative method. Synergies (W) were extracted from raw EMG data. EMG data is then shuffled and fed again to the algorithm with W as fixed synergy, and activation coefficient (C) is allowed to be estimated. The EMG signal was reconstructed with W and newly estimated activation coefficient (Cnew). Cross-validation is performed between the original (E) and the reconstructed EMG data.
