Comparison of Initialization Techniques for the Accurate Extraction of Muscle Synergies from Myoelectric Signals via Nonnegative Matrix Factorization

Figure 6

Decomposition of experimental EMG data recorded during pedaling. (a) Decomposition of matrix ; synergy activation coefficients (upper) and synergy vectors obtained with the three different initialization techniques, together with the original . (b) Decomposition of matrix ; synergy activation coefficients C_CORR (upper) and synergy vectors obtained with the three different initialization techniques, together with the original .