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

Figure 2

Simulated muscle synergy vectors: (a) the independent synergy vectors , in which each muscle significantly contributes to only one synergy; (b) the dependent synergy vectors , in which the contribution of muscle is comparable between the two synergies.

(a)

(b)