Abstract
One subject was exposed to an octave-band noise centered at 500 Hz for 48 h at 81.5 dB SPL and on a second occasion for 29.5 h at 92.5 dB SPL. Auditory sensitivity was measured before, during, and following the exposure as was temporal auditory summation, loudness, frequency discrimination, and evoked vertex potentials. After 8–12 h of exposure, the growth of temporary threshold shift (TTS) was asymptotic. Recovery from asymptotic TTS required 2–4 days even though the magnitudes of TTS were only about 10 dB for the 81.5 dB exposure and 27.5 dB for the 92.5 dB exposure. Other test results showed that during and following asymptotic TTS, the time constant of temporal auditory summation was decreased, and recruitment of loudness was delayed and incomplete; however, frequency discrimination and the slope of the input-output function of the N1−P2 potential were unaffected.
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