FIGURE 1.

Diagram of stimulating current pulses used in mouse study. A, Square waveform is composed of a cathodic current pulse and a second anodic current pulse that balances the cathodic phase. There is no interphase delay between these two pulses. The total stimulation width is 1 ms. B, Sine waveform also has cathodic first current and 1 ms of stimulation. C, Pulse train waveform consists of 12 cathodic phases followed by another 12 anodic phases with interphase delay in between them. Each stimulus phase and interphase delay is 40 μs, and the total stimulation time is 0.96 ms (0.48 ms cathodic and 0.48 ms anodic) and delay time is 0.96 ms.