Abstract
Evoked‐response tuning curves from chinchillas were measured before and after exposure to an octave band of noise (CF = 0.5 kHz) that produced an asymptotic threshold shift (ATS) which was nearly flat from 0.5 to 16 kHz. The hearing loss was systematically increased from roughly 15, 30, and 45 dB by increasing the level of the noise from 75, 85, and 95 dB SPL. Tuning curves were measured in awake animals using a simultaneous masking paradigm. As hearing loss increased, there was a progressive broadening of the tuning curve; little or no tuning was present after the highest noise exposure. The systematic loss of tuning will be related to behavioral and single unit tuning curves obtained with the same noise exposure. [Work supported by NINCDS, USAR.]
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