Original Research

Towards the preferred stimulus parameters for distortion product otoacoustic emissions in adults: A preliminary study

Lucretia Petersen, Wayne J. Wilson, Harsha Kathard
South African Journal of Communication Disorders | Vol 65, No 1 | a585 | DOI: https://doi.org/10.4102/sajcd.v65i1.585 | © 2018 Lucretia Petersen, Wayne J. Wilson, Harsha Kathard | This work is licensed under CC Attribution 4.0
Submitted: 31 October 2017 | Published: 16 July 2018

About the author(s)

Lucretia Petersen, Division of Communication Sciences and Disorders, Department of Health and Rehabilitation Sciences, Faculty of Health Sciences, University of Cape Town, South Africa
Wayne J. Wilson, School of Health and Rehabilitation Sciences, Faculty of Health and Behavioural Sciences, University of Queensland, Australia
Harsha Kathard, Division of Communication Sciences and Disorders, Department of Health and Rehabilitation Sciences, Faculty of Health Sciences, University of Cape Town, South Africa


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Abstract

Background: Although distortion product otoacoustic emissions (DPOAEs) are useful in evaluating cochlear outer hair cell function, determining the optimal stimulus parameters could result in a more reliable, sensitive and specific diagnostic tool across the range of DPOAE applications.

 

Objectives: To identify which stimulus parameters warrant further investigation for eliciting the largest and most reliable DPOAEs in adult humans.

 

Method: A single group, repeated measures design involving a convenience sample of 20 normal-hearing participants between 19 and 24 years of age.

 

Results: Descriptive statistics and mixed model analyses suggested L1/L2 intensity levels of 65/65 dB sound pressure level (SPL) and 65/55 dB SPL, and f2/f1 ratios of 1.18, 1.20 and 1.22 elicited larger and more reliable DPOAEs in both ears.

 

Conclusion: Further investigation of the 65/65 dB SPL and 65/55 dB SPL intensity levels and the 1.18, 1.20 and 1.22 f2/f1 ratios is warranted to determine the stimulus parameters for eliciting the largest and most reliable DPOAEs in adult humans across the range of DPOAE applications.


Keywords

distortion product otoacoustic emissions; stimulus parameters; adults; test-retest reliability

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