FIG. 3.

Alterations of neural (CAP) responses and DPOAEs in the ear shown in Figures 1 and 2. Endocochlear potential, CAP thresholds, and DPOAE measurement in the treated (right ear, RE) and control (left ear, LE) ears. A CAP thresholds in the treated ear are elevated by about 15 dB at frequencies below 4 kHz and by as much as 70 dB at higher frequencies as compared with the control ear. EP values declined by about 60 mV from control values in the basal turn (T1) and about 40 mV in the middle (T2) and apical (T3) turns. B DPOAE amplitudes were reduced, but remained relatively robust in the treated ear except above 12 kHz. Dotted curve is the acoustic noise floor.