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Simultaneous binaural measurements of transient evoked otoacoustic emissions in adults
Reese, Edie
Reese, Edie
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Reese_2024.pdf
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2024-04-26
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Reese, E. 2024. Simultaneous binaural measurements of transient evoked otoacoustic emissions in adults. -- In Proceedings: 20th Annual Symposium on Graduate Research and Scholarly Projects. Wichita, KS: Wichita State University
Abstract
INTRODUCTION: The ear is divided into three sections: the outer ear, middle ear, and inner ear. The inner ear contains the cochlea, which houses the inner hair cells that transform acoustic energy to electrical signals as sounds enter our ear and outer hair cells that generate energy to amplify sounds. The acoustic signals produced by the outer hair cells emit back to the ear canal, known as otoacoustic emissions (OAEs). OAEs are measured clinically to assess cochlear function. Transient-evoked OAE (TEOAE) tests utilize clicks or tone bursts as the stimulus. Typically, one ear is assessed at a time, but some OAE systems allow simultaneous measurement of OAEs from both ears. Binaural procedures can reduce the test time when used as a hearing screening tool in a large population. However, results may be influenced by the auditory efferent system, which mainly inhibits outer hair cell activities. Previous studies have confirmed that the OAE amplitude is reduced as a sound is simultaneously presented in the other ear to activate the efferent system. To the best of our knowledge, no study has investigated the reliability of binaural OAE measurements. PURPOSE: To compare TEOAEs in amplitude tested with the binaural procedure and the conventional monaural procedure in the same adult ears. METHODS: A repeated measures experimental design was applied and thirty normal-hearing young adults were proposed to recruit. A set of screening procedures were utilized to ensure each participant met the inclusion criteria. The test ear was randomly assigned for all participants. TEOAEs were recorded using an ILO 292 OAE system with the monaural and binaural procedures, respectively. Clicks and tone bursts (1 kHz) were presented as the stimulus at 60 dB and 80 dB SPL, respectively. A total of 8 trials were run randomly. RESULTS: Data have been collected from 15 participants. Compared with those in monaural tests, TEOAE levels in binaural tests tend to increase (~1 to 3 dB) at all five measured frequencies (1 to 4 kHz) for 60-dB stimuli and tend to decrease (~1 to 2 dB) at 1 kHz for 80-dB stimuli. A two-way repeated measures ANOVA followed by Bonferroni t-test indicated that the difference in TEOAE level between tests was significant (p<0.05) for the following conditions: 1–4 kHz for 60-dB clicks and 1.5–2 kHz for 60-dB tone burst, and 1 kHz for80-dB clicks. In the binaural test, a two-way repeated measures ANOVA showed that the main effect of the test ear versus the non-test ear was not significant (p>0.05) for all testing conditions. CONCLUSION: The binaural procedure results in small but statistically significant changes of TEOAE levels under most testing conditions, compared to the monaural procedure. There is no significant difference in TEOAE levels between the test ear and the non-test ear in binaural tests.
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Presented to the 20th Annual Symposium on Graduate Research and Scholarly Projects (GRASP) held at the Rhatigan Student Center, Wichita State University, April 26, 2024.
Research completed in the Department of Audiology, College of Health Professions.
Research completed in the Department of Audiology, College of Health Professions.
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Wichita State University
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GRASP
v. 20
v. 20