Movie S2.

This movie demonstrates that the sSNN-driven walker slow-downs the walking rythm and speed, and instantaneously reforms the stable walking gait. The walking speed and frequency are shown in the Fig. 2-(B1-B3). Note that the success rate for the falling-prevention in this extreme-slippery environment where the friction coefficient is set to μ = 0.04 for t = [10, 40], is not very high and approximately 1%.