Fig. 5.

Consistency of muscle synergy structure and tuning across subjects. A: W₁ was consistently identified in all 12 subjects (r = 0.90 ± 0.03). B: W₁ had a preferred tuning direction in all subjects during backward-leftward perturbations (forward-rightward CoM acceleration directions). C: W₂ was identified in 11 of 12 subjects (r = 0.87 ± 0.08). D: for 8 of 11 subjects, W₂ had 2 preferred tuning directions (solid traces); 3 of 11 subjects had 1 preferred tuning direction (shaded traces). The shaded muscle synergies in C correspond to the shaded tuning curves in D.