Mean AN density for both the implanted and contralateral control cochleae for each cohort in this study (black bars = implanted; open bars = contralateral controls). AN density was significantly greater in the UB turn (i.e. the site of stimulation) in five stimulated cohorts compared with their paired control (b, e, g, h, i). There was also a statistically significant difference in the LB region of the unstimulated control cochleae (a) and the UM region of 540 CC μC/cm2/phase (i). There was no statistically significant difference in any other region of control or stimulated cochleae (i.e. LB, LM, UM and A turns). HR = stimulation at 1000 pps; AP = alternating leading phase; CC = capacitive coupling. * p < 0.05; ** p < 0.01 (Paired t-test; Error bars = sem).