碩士 / 國立臺北護理健康大學 / 語言治療與聽力研究所 / 106 / Purpose: Function of auditory efferent pathway on olivocochlear system can be evaluated by measuring contralateral suppression of evoked otoacoustic emissions (EOAEs) and speech-in-noise perception (SINP). For normal hearing subjects, previous studies found that when sufficient noise was delivered to the contralateral ear, there will be a positive correlation between the amount of suppression on the EOAEs amplitude and the amount of change in signal-to-noise ratio (SNR) of improvement on speech-in-noise perception. However, there is still controversy about conclusive evidence shown by the other studies. The purpose of the present study is to examine the differential effects of contralateral noise on the distortion-products OAE (DPOAE) and speech-in-noise perception for both high-frequency hearing loss subjects with tinnitus and normal hearing subjects without tinnitus.
Methods: The study comprised 39 participants, performed on 20 normal hearing subjects as the control group, 6 men and 14 women, 25 to 53 years old (mean = 35 years, SD = 9.2 ), and on 19 patients with tinnitus and high-frequency sensorineural hearing loss as the experimental group, 2 men and 17 women, 21 to 55 years old (mean = 44.3 years, SD = 11.5 ). Recruited subjects in the experimental group their hearing loss should be less than 40 dB HL at each of the measured octave intervals from 0.25 to 8 kHz. The DPOAE and speech-in-noise perception were measured in the test ear with and without the presence of contralateral noise.
Results: Contralateral noise stimulation decreased DPOAE amplitudes in each group. Meanwhile, the improvement of speech-in-noise perception in the test ear was observed in each group but the significant difference only present on two frequencies in which f2 was 1312 Hz and 2343 Hz. In the control group, a positive correlation can be seen between the suppression amounts of the DPOAE amplitude and the improved change of SNR at the frequency of 2343 Hz. Whereas such a correlation was not observed in the experimental group.
Conclusion: The presence of contralateral noise can reduce the DPOAE amplitude and improve the speech-in-noise perception for normal listeners and high-frequency hearing-impaired listeners with tinnitus. However, in our current study with limited participants, only listeners with normal hearing present a correlation between SINP changes and the amount of DPOAE contralateral suppression. Further studies by increasing the sample size are required to allow optimal analysis.
| Identifer | oai:union.ndltd.org:TW/106NTCN0714015 |
| Date | January 2018 |
| Creators | Ling-Hua Cheng, 鄭琳樺 |
| Contributors | Chih-Hung Wang, Yu-Fu Chen, 王智弘, 陳郁夫 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 36 |
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