Abstract
Five men having normal pre‐exposure audiograms were monaurally exposed in a diffuse sound field for 24 hours to octave‐band noise centered at 500 or 2000 Hz at 90 or 80 dB SPL, respectively. Each subject's exposures were two weeks apart. The growth of threshold shift was measured 10 times, and recovery was followed for a course of three days post exposure by a fixed‐frequency‐Bekesy‐tracking procedure. Functional asymptotic threshold shift (ATS) was achieved for either noise exposure within eight hours at all 11 audiometric test frequencies. The maximum ATS for either exposure was the upper cut‐off frequency of the noise with significant spread to the first octave above the noise's center frequency. For each exposure, growth was linear in logarithmic space. For multiple exposures on one subject at each band, the relationship between asymptotic level and noise intensity appeared to be linear with a slope of 1.6. Group data demonstrated that recovery from a 16.7 dB asymptotic threshold shift at 707 Hz required 98 h and was biphasic. Recovery from an 11.3 dB ATS at 2828 Hz required 20 h. Recovery from either noise was linear in logarithmic space.
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