Fig. 3.

Body rotations versus stimulation current amplitude measured for three implanted subjects (left side). For S1 and S2, the PAN electrode was active, for S4, the SAN electrode. Trunk (blue plots, left column) and head (red plots, right column) were measured during 20 s trials of the stepping test. Three trials were performed per experimental condition (blinded to the subject and the experimenters). “Inhibitory” conditions correspond to stimulation current amplitudes below “baseline” (350 µA, purple dotted lines). “Excitatory” conditions correspond to stimulation current amplitudes above “baseline”. Mean results in the system OFF conditions (without any electrical stimulation) are presented as solid gray lines (± SD, gray dotted lines)