Pulse shapes vary phase duration while holding total delivered charge balanced

Evidence

The duration of the phases of SYM, of the short, high-amplitude phases of RPS and RPS-IPG and of the central phase of TRI was 86 μs. The long, low-amplitude phases of RPS and RPS-IPG were 8 times longer and lower in amplitude to maintain the total charge balanced. The first and third phases of TRI had a duration of 43 μs and the same amplitude as the central phase. — Dijk, Pim van, Physiology, Psychoacoustics and…, 2292

Categorization

• QUESTION: Worth verifying the charge-balance rationale — why total charge must be balanced and what happens if it isn’t (tissue damage? electrode corrosion?).