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J Audiol Otol > Epub ahead of print
[Epub ahead of print] Published online January 5, 2018.
The Effect of Primary Levels and Frequencies on the Contralateral Suppression of Distortion Product Otoacoustic Emission
Natalia Yakunina1, Jinsook Kim2, Eui-Cheol Nam3
1Institute of Medical Science, School of Medicine, Kangwon National University, Chuncheon, Korea
2Division of Speech Pathology and Audiology, Research Institute of Audiology and Speech Pathology, College of Natural Sciences, Hallym University, Chuncheon, Korea
3Department of Otolaryngology, School of Medicine, Kangwon National University, Chuncheon, Korea
Correspondence  Eui-Cheol Nam ,Tel: +82-33-258-2311, Fax: +82-33-255-8809, Email: birdynec@kangwon.ac.kr
Submitted: September 15, 2017  Accepted after revision: December 5, 2017
Abstract
Background and Objectives
Changes in distortion product otoacoustic emission (DPOAE) caused by contralateral suppression (CS) allow the function of the auditory efferent system to be evaluated. Parameters affording maximum CS are preferred in terms of clinical application. Our objective was to evaluate the effects of primary levels and frequencies on DPOAEmediated CS.
Subjects and Methods
Sixteen subjects with normal hearing participated. DPOAEs were recorded with and without contralateral acoustic stimulation; we delivered broadband noise of 65 dB SPL at f2 frequencies between 1,000 Hz and 6,727 Hz, at 8 pt/ octave. The L2 was varied between 40 dB SPL and 80 dB SPL in 10-dB steps.
Results
L2 did not significantly affect DPOAE-mediated CS. Higher L2 levels significantly reduced the fine structure depth of both the baseline and suppressed DPOAE datasets. The amount of CS was greatly affected by the f2 frequency; lower and higher frequency ranges afforded significantly stronger suppression than did mid-frequencies within the studied range.
Conclusions
Our findings suggest that DPOAE CS should be measured over a wide range of frequencies as the amount of CS seems to be highly dependent on f2. The use of a higher L2 level may be optimal when it is sought to evoke strong DPOAE-mediated suppression while simultaneously minimizing DPOAE fine structure. Our findings may assist in optimization of clinical procedures evaluating the integrity of the auditory efferent system.
Keywords: Broadband noise · Contralateral suppression · Distortion product otoacoustic emission · Primary frequency · Primary level


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