Temporary Threshold Shift as a Function of Noise Exposure Level

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Abstract
Under special conditions, numerous investigators have observed that, when duration of exposure is held constant, a greater temporary threshold shift (TTS) may occur after exposure to a lower sound level than after exposure to a higher sound level. However, at least after a short recovery interval, it would be reasonable to expect that the TTS following exposure to higher sound levels would be an increasing function of the exposure level. In the present study the TTS was measured continuously with a Bekesy-type audiometer at 4000 and 6000 cps for 10 minutes following a 3-minute exposure to a thermal noise. Five different noise levels, ranging in 5-db steps from 108 to 128 db, were used. Among 9 ears tested, twice on each condition, only one ear showed a pattern of decreasing TTS with an increased noise exposure level at both measuring frequencies.

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