Fig. 8.

Average normalized similarity of estimated synergies from each algorithm with a model and no variability (outlined bars) and with increasing variability. Variability was added to the synergy activations for 10 trials in each force direction with a magnitude specified by the signal-to-noise ratio scaled to the synergy activations. Similarity was normalized to similarity expected by chance (0 equals similarity expected by chance, 1 equals perfect similarity). *#Significant change in normalized similarity compared with the original analysis with biomechanical and mechanical task constraints and no variability at significant levels of 0.05 and 0.10, respectively. Error bars indicate means ± SD.