Fig. 2

Schematic representations of electrode configurations for a) Experiment 1 and c) Experiment 2. The middle panel b) illustrates typical electrical pulse trains for the SDSS and SES protocols, where the y-axis represents electrode channels, and the x-axis represents time (arbitrary units). The orange regions in the schematics indicate the stimulated muscle groups. The colors (red, blue, yellow, and green) in the SDSS plots serve as a reminder that different electrodes (regions around the motor point) are activated at different times. The total applied stimulation intensity using both configurations (SDSS and SES) was equal