Abstract
The cat's auditory threshold was determined with behavioral methods before and at intervals after exposure to intense thermal noise. Using two bands of noise with different upper cutoffs (500–504 and 500–508 kHz) and two intensity levels, exposure duration was gradually increased (three exposures at each D) until PTS occurred for each cat. The shapes of the postexposure audiograms were determined, and recovery curves were traced. The shapes of the postexposure audiograms were found to differ significantly as a function of the upper cutoff limits, the intensity levels, and the different exposure durations. For example, the frequency showing the greatest loss was not invariable across all conditions. In addition, there were significant individual differences in both the amount of TTS and the shape of the postexposure audiogram. The relationship between individual susceptibility to TTS and PTS was also determined and will be reported.
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