ROEDE, J and HARRIS, FP and PROBST, R and XU, L (1993) REPEATABILITY OF DISTORTION-PRODUCT OTOACOUSTIC EMISSIONS IN NORMALLY HEARING HUMANS. AUDIOLOGY, 32 (5). pp. 273-281. ISSN 0020-6091,
Full text not available from this repository.Abstract
Distortion product otoacoustic emissions (DPOAEs) at the frequency of 2f1 - f2 were measured in one or both ears of 12 young adults during 4 test sessions over a 6-week period. The purpose was to determine the variability in DPOAE amplitudes and 'detection thresholds' over repeated measurements using a computer-based time-averaging system. DPOAEs were generated with f1 and f2 relative to (f1f2)1/2 in two basic paradigms: (a) fixed levels of L1 = L2 of 70 and 55 dB SPL over a stimulus range from 0.8 to 8 kHz in 0.2-octave intervals; (b) input-output functions in stimulus regions of 0.8, 1, 1.5, 2, 3,4 and 6 kHz, L1 from 35 to 70 dB SPL changing in 5-dB steps and L2 at 6 dB below the amplitude of L1. The mean variability of DPOAE amplitudes with equilevel stimuli was 1.8 dB (SD = 1.8) for L1 = 70 dB SPL and 2.9 dB (SD = 2.7) for L1 = 55 dB SPL. It was 1.7 dB (SD = 1.7) and 2.4 dB (SD = 2.0) for comparable levels of L1 with L2 at 6 dB below L1. Variability in amplitude of the DPOAEs for the fixed-level condition was greatest overall above 6 kHz and below 1 kHz and in the 2-kHz region for one third of the subjects. Neither individual differences in emission amplitudes nor the presence of spontaneous otoacoustic emissions had a significant influence on the amount of amplitude variability within ears. Variability was not influenced by the length of time between measurements from 1 to 6 weeks. Median variability in detection threshold was from 0 to 5 dB SPL. According to these results, a change in DPOAE amplitude of more than 6-9 dB, depending upon stimulus levels, would indicate a significant change in cochlear status if recording conditions and middle-ear status are stable.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | ; OTOACOUSTIC EMISSION; DISTORTION PRODUCT OTOACOUSTIC EMISSION; HEARING TESTING; COCHLEAR PHYSIOLOGY |
| Depositing User: | Dr. Gernot Deinzer |
| Last Modified: | 19 Oct 2022 08:42 |
| URI: | https://pred.uni-regensburg.de/id/eprint/53791 |
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