Abstract
The Mongolian gerbil (Meriones unguiculatus) was used to evaluate effects of intense noise exposure on functions of the hair cells. Cochlear microphonics (CM) served an index to show functions of the hair cells. The purpose of this study was to verify which frequency was most damaged by noise exposure and examine relationships between the frequency and the animal’s behaviors. We measured growth and recovery of the temporal shifts in amplitude of CM. The CM was recorded from the round window. Test stimuli used were tone bursts (1–45 kHz in half octave step), with duration of 50 ms (5 ms rise/fall times). The subject was exposed to broadband noise (0.5 to 60 kHz) at 90 dB SPL for 5 minutes. Threshold shifts were measured for the testing tone bursts from immediately after the exposure up to 120 minutes after the exposure. Findings showed that reduction in CM amplitude was observed after the noise exposure. Especially, large reduction was produced in a frequency range of 22.4 kHz. However, little reduction was observed around a frequency range of 4 kHz.
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