Abstract
Monaural chinchillas (15) were exposed to 50 impulses of either 155 or 161 or 166 dB peak SPL. The imuplses were generated by a shock tube and had an A duration of 1 msec. Quiet threshold was measured at 0.25, 0.5, 1, 2, 4, and 8 kHz using the average evoked response (AER) technique. Recovery was monitored for 31 days. The median PTS for all frequencies was determined by the level of the impulse: the 155 dB level produced essentially no PTS, the 161 dB level produced approximately 10 dB PTS across all frequencies, and the 166 dB level produced 13 to 35 dB PST. For moderate to severe TTS, as much as 14 h were .necessary to reach maximum TTS. Unlike PTS results, TTSmax was not strictly determined by the level of the impulse. Specifically, the correlation between the PTS and TTSmax ranged from only r = 0.34 to r = 0.75. The results will be discussed in reference to existing damage-risk criteria for impulse noise. [Research supported by the Hendricks Foundation.]
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