Abstract
Anesthetized chinchillas were maintained in quiet for 24 to 48 hours with virtually no loss of maximum CM voltage or of CM sensitivity. Alteration of body temperature (and parallel change in cochlear temperature) from 29° to 39°C had little effect on normal CM response. With presentation of steady octave-band noise centered at 1 kHz at 90 dB SPL overall, CM progressively decreased and approached an asymptote at a rate dependent on body temperature; the rate of reduction was less at lower temperatures and greater at higher temperatures. In addition, CM tended to remain near initial values longer at lower temperatures. With termination of the noise, at higher temperatures there was an initial rapid recovery of CM followed by a slower recovery toward normal CM values for the duration of the experiment. At lower temperatures, recovery of CM appeared to be retarded. These studies are interpreted as indicating that noise-induced reduction of cochlear response is linked to metabolic processes. [Supported by NINDS Grant NS 03856.]
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