Figure 4
Dynamics of the motor neurons. Green and blue represent SMBVL and SMBDL respectively. The solid-colored curves in 3D sub-graphs show the projections of 3D curves onto each plane. The shaded areas represent the regions of the neuronal output sensitive to neuronal input in the absence of the sensory input. (a) Dynamics in the absence of sensory input. The brown and purple curves on the y–z plane show the SISO curves of the SMBVL and SMBDL, respectively. (b), (c) Instantaneous differences in the neuronal inputs and outputs induced by an up-step (b) or a down-step (c) at a phase of 0.75π. The dashed lines show the trends of the neuronal inputs with phase when there is no sensory input. (d), (e) Differences in the neuronal inputs and outputs induced by an up-step (d) or a down-step (e) at each locomotion phase.
