Fig. 10.
Comparison of muscle synergies for the spatial protocol across subjects. A: muscle synergies were similar across 8 subjects (S1–S8). The 4 synergies are identified according to the mechanical action of the muscles activated within each synergy: E Flex, E Ext, S Add/Flex, and S Abd/Ext. The mean similarity of a synergy with other subjects' corresponding synergies (r value) exceeded the chance level (P < 0.05) and is indicated next to each synergy. B and C: goodness of reconstruction (VAF values) of EMG data recorded from a single subject using one's own synergies was relatively similar to that obtained using muscle synergies from other subjects (mean ± SD; n = 8). However, the global one's VAF and muscle VAF values associated with use of a subject's own synergies were significantly higher than those obtained using others' synergies (*P < 10−3; **P < 10−4).