Figure 3.

Performance of the myokinetic experimental prototype: E_model, E_cross-talk, E_sensor. Each MM was moved along the anatomically appropriate ROM of the relative muscle (a: MM₀ – APL; b: MM₁ – FPL; c: MM₂ – FDS₁; d: MM₃ – FDS₂), while the remaining MMs were kept at their initial/rest position. (A) Estimated versus actual displacements of the MMs: while the moving MM is appropriately tracked (R² = 0.99) the computed displacement of non-moving MMs represent the cross-talk errors, E_cross-talk (dot markers). For each moving MM,the difference between the actual and the estimated displacement (E_model) is shown with cross markers. (B) E_model and E_cross-talk averaged over the entire ROM. E_model and E_cross-talk correspond to the diagonal and non-diagonal elements of the confusion matrix, respectively. (C) Technological limitations affecting the myokinetic interface (E_sensor). For both panels (B) and (C): each row contains the errors related to a single MM; each column contains the errors generated by the movement of a specific MM.