FIG. 1.

Cochlear thresholds return to normal at all but the highest frequency in mice exposed to 8–16 kHz noise at 98 dB for 2 h. A, B Mean thresholds (±SEMs) for DPOAEs (A) and ABRs (B) seen in control unexposed ears (black; n = 7) and in separate groups of age-matched ears, either 24 h (lavender, n = 14, DPOAE only) or 1 week (blue; n = 7) after exposure. C Mean suprathreshold amplitudes of ABR wave 1 in the same groups of animals shown in A and B: amplitudes were averaged for each ear and each frequency for sound levels from 60 to 80 dB SPL. Asterisks indicate frequencies at which differences from control were significant (p < 0.01). Error bars on some points are hidden by the symbols.