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Title:Establishing critical differences in ear-canal stimulus amplitude for detecting middle ear muscle reflex activation during olivocochlear efferent measurements
Author(s):Mertes, Ian B.
Subject(s):Acoustic reflex
MOC
contralateral inhibition
olivocochlear efferent
otoacoustic emissions
Abstract:Objective: Assessments of the medial olivocochlear reflex (MOCR) may have clinical utility. The MOCR is measured using contralateral inhibition of otoacoustic emissions but concurrent activation of the middle ear muscle reflex (MEMR) confounds test interpretation. MEMR activation can be detected using the change in ear-canal stimulus amplitude without versus with an MOCR elicitor. This study provides a description of how critical differences in ear-canal stimulus amplitude can be established.Design: Clicks were presented in right ears without and with a contralateral MOCR elicitor. Ear-canal stimulus amplitudes were measured. Two measurements without an elicitor were used to develop critical differences. MEMR activation was considered present if the difference in ear-canal stimulus amplitude without versus with an elicitor exceeded the critical difference.Study sample: Forty-six normal-hearing adults (mean age = 23.4 years, 35 females) participated, with data from 44 participants included in the final analysis.Results: Two participants exceeded the 95% critical difference. The 80, 90 and 99% critical differences are also reported for reference.Conclusions: Results suggest that the contralateral elicitor can evoke the MEMR in a small number of participants. The methods described in this paper can be used for developing equipment- and clinic-specific critical differences for detecting MEMR activation.
Issue Date:2020
Citation Info:Mertes, I. B. (2020). Establishing critical differences in ear-canal stimulus amplitude for detecting middle ear muscle reflex activation during olivocochlear efferent measurements. International Journal of Audiology, 59(2), 140–147.
Genre:Article
Type:Text
Language:English
URI:http://hdl.handle.net/2142/106120
DOI:10.1080/14992027.2019.1673491
Sponsor:American Speech-Language-Hearing Foundation (2017 New Investigators Research Grant)
Office of the Vice Chancellor for Research, University of Illinois at Urbana-Champaign (Arnold O. Beckman Award)
Date Available in IDEALS:2020-02-22


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