Fig. 2.
Illustration of the different controller designs considered. (Top) Full-dimensional controller with access to the full state of the system, which can activate each muscle independently (best-case controller). (Middle) Controller with access to the full state but that activates muscles through synergies. (Bottom) Low-dimensional controller (LDC) with access to a low-dimensional state variable and that uses muscle synergies, thereby simplifying control even further.
