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Journal of Speech, Language, and Hearing Research Vol.41 1319-1334 December 1998.
© American Speech-Language-Hearing Association
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Transient-Evoked Otoacoustic Emissions as a Measure of Noise-Induced Threshold Shift

Lynne Marshall 1
Laurie M. Heller 1
1 Naval Submarine Medical Research Laboratory Groton, Connecticut

marshall{at}nsmrl.navy.mil

Otoacoustic emissions and behavioral hearing thresholds were measured before and after exposure to a 10-min, 105-dB SPL, half-octave band of noise centered at 1.414 kHz. Along a single recovery function, transient-evoked otoacoustic-emission (TEOAE) measurements made with 74-dB pSPL nonlinear click ensembles were alternated with a Bekesy threshold-tracking procedure. Each of the 14 participants with normal hearing underwent 2 hour-long temporary-threshold shift (TTS) sessions as well as 2 pretest sessions and a posttest session. The Bekesy test frequency was fixed at 2.0 kHz, whereas emissions were analyzed in half-octave bandwidths with center frequencies ranging from 0.707 to 5.656 kHz. Results showed that (a) the maximum temporary emission shifts (TES) were half 1 octave above the exposure frequency; (b) the 4.7-dB average temporary emission shift magnitude at approximately 2 min postexposure was less than half of the 11.7-dB average TTS; (c) the average recovery times for emissions and hearing thresholds were similar (188 vs. 186 min); and (d) the average TTS magnitude along the recovery function was predictable from TES magnitude. It concluded that both TEOAEs and Bekesy thresholds reveal the same aspects of postexposure inner-ear changes.

KEY WORDS: temporary threshold shift (TTS), otoacoustic emissions, noise-induced hearing loss, hearing conservation, transient-evoked otoacoustic emissions, click-evoked otoacoustic emissions (TEOAE, TOAE, COAE)

Submitted on January 16, 1998
Accepted on August 24, 1998


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