Abstract
A gap detection threshold (GDT) procedure was used to measure auditory temporal acuity in humans before and after exposure to a brief, intense low‐(0.4‐kHz) or high‐(1.7‐kHz) frequency tone. The maximal temporary threshold shift (TTS) produced by each exposure was approximately 10 dB. GDT stimuli were octave‐band noises centered at one of three frequencies: the exposure frequency, 1/2 oct above the exposure frequency, or 1 oct above the exposure frequency. GDTs were obtained at 35, 55, and 75 dB SPL at each center frequency. GDT and TTS recovery were monitored for 16 min following an exposure. The results from the high‐frequency exposure condition indicate that changes in GDT can be predicted from shifts in absolute threshold. For the low‐frequency condition, difference between the GDT and TTS recovery functions and elevated GDTs in the absence of significant TTS require an alternative explanation. [Work supported by NIOSH.]
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