Transient-Evoked Otoacoustic Emissions as a Measure of Noise-Induced Threshold Shift 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 ... Article/Report
Article/Report  |   December 1998
Transient-Evoked Otoacoustic Emissions as a Measure of Noise-Induced Threshold Shift
 
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Hearing & Speech Perception / Acoustics / Hearing Disorders / Hearing
Article/Report   |   December 1998
Transient-Evoked Otoacoustic Emissions as a Measure of Noise-Induced Threshold Shift
Journal of Speech, Language, and Hearing Research, December 1998, Vol. 41, 1319-1334. doi:10.1044/jslhr.4106.1319
History: Received January 16, 1998 , Accepted August 24, 1998
 
Journal of Speech, Language, and Hearing Research, December 1998, Vol. 41, 1319-1334. doi:10.1044/jslhr.4106.1319
History: Received January 16, 1998; Accepted August 24, 1998

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.

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