Abstract

PETERSEN, Lucretia; WILSON, Wayne J.  and  KATHARD, Harsha. Towards the preferred stimulus parameters for distortion product otoacoustic emissions in adults: A preliminary study. S. Afr. J. Commun. Disord. [online]. 2018, vol.65, n.1, pp.1-10. ISSN 2225-4765.  http://dx.doi.org/10.4102/sajcd.v65i1.585.

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.

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