Abstract
Ten young normal-hearing adults were exposed to magenta noise in 27-min bursts with 33-min interburst pauses. The level of successive bursts increased in 5-dB steps from 90 dBA to 105 dBA. In the experimental condition, listeners drank the equivalent of 3 oz. of grain alcohol in the period between the end of the 90-dBA exposure and the beginning of the 105-dBA exposure. In the control condition, no alcohol was ingested. Mean temporary threshold shifts at 500, 1400, and 4000 Hz measured via Bekesy audiometry 2 min after exposure (TTS2) were identical in the two conditions, even after the 105-dBA exposure. However, TTS32 was slightly higher in the intoxicated condition (by 2 dB, which just achieves significance at the 5% level). The result is interpreted as showing the effects of alcohol on threshold-finding behavior rather than on auditory fatigue per se. [Research supported by the National Institute for Occupational Safety and Health, Public Health Service, although they did not specifically authorize this particular study.]
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