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Example of spatial forces associated to muscle and synergies. (A) The EMG-to-force matrix H (left: projections of the columns of H on the Fz = 0 plane, middle: projection on the Fx = 0 plane, right: projection on the Fy = 0 plane) estimated by linear regression of EMG and force data for subject 8. (B) Forces associated to the synergies (columns of the matrix obtained by multiplying the EMG-to-force matrix H by the synergy matrix W) of subject 8.
