Abstract
Thresholds for detection of a 3-kHz tone embedded in a 2121–4242-Hz octave band of masking noise or a 6-kHz tone in 4243–8486-Hz masking noise were determined before and after fatiguing noise exposure. Masking-noise levels were varied from 0 to 90 dB (re 20 μN/m2). The fatiguing noise was a 1414− to 2828-Hz or a 2829–5658-Hz octave band of noise set at intensities between 90 and 115 dB. Each observation included the following parts: (1) prefatigue threshold determination, (2) 3-min exposure to intense noise, (3) 90-sec delay, and (4) postfatigue threshold determination. The results of a series of observations employing the above procedure indicate that tone thresholds were elevated following the fatiguing-noise exposure by up to 22 dB when the tones were embedded in 0−dB masking noise (TTS2=22 dB). However, tone thresholds were elevated only slightly following fatiguing-noise exposure when the tone was embedded in 45–90-dB masking noise. Possible mechanisms that might account for these observations are considered. Subject Classification: [43]65.58, [43]65.66, [43]65.50, [43]65.75.
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