A, Intensity differences between the two apical electrodes were varied while keeping the total current (in CUs) presented constant. B, BDs were recorded in response to all inter-implant level difference conditions, the numbers of recordings are indicated for each condition. Mean BD amplitudes (normalized relative to mean CI1- and CI2-evoked eV amplitudes) increase as intensity differences between the two CIs decreases (F(5,156) = 5.35, p < 0.01). There is no similar change in the mean wave eV amplitudes. C, Mean BD latencies (normalized relative to CI2-evoked eV latency) do not significantly change with changing inter-implant level differences (F(5,147) = 1.88, p > 0.05).