Contralateral Suppression of Transient Evoked Otoacoustic Emissions: Normative Data for a Clinical Test Set-Up
作者:
Geert De Ceulaer,
Marjan Yperman,
Kristin Daemers,
Kristin Van Driessche,
Thomas Somers,
F. Offeciers,
Paul Govaerts,
期刊:
Otology & Neurotology
(OVID Available online 2001)
卷期:
Volume 22,
issue 3
页码: 350-355
ISSN:1531-7129
年代: 2001
出版商: OVID
关键词: Otoacoustic emissions;Contralateral suppression;Cochlear mechanics;Outer hair cell;Efferent system
数据来源: OVID
摘要:
HypothesisContralateral suppression of transient evoked otoacoustic emissions (TEOAEs) can be used in a clinical set-up using a procedure based on a unique and robust parameter to quantify the magnitude of suppression for a subject.BackgroundTEOAEs can be suppressed by delivering contralateral white noise (WN). This suppression is thought to be mediated via the efferent nerve fibers that innervate the outer hair cells. The ipsilateral TEOAE-eliciting click stimulus level and the contralateral WN level have a strong impact on the recorded level of suppression.MethodsTEOAEs were recorded using the nonlinear stimulation mode in two conditions (with and without contralateral WN). An optimal TEOAE-eliciting click stimulus level and contralateral WN level were defined to obtain a unique and robust parameter to quantify the magnitude of suppression.ResultsSuppression of TEOAEs with contralateral WN can be measured in a clinical set-up using nonlinear stimulation, and the level of suppression is of the same order of magnitude as measures using the linear stimulation recording mode. The level of suppression appears to be “locked” to the interaural difference between ipsilateral TEOAE-eliciting broadband click stimulus level and the contralateral WN level.ConclusionsA procedure is proposed to record contralateral suppression in a clinical set-up, and normative data are given for a normal-hearing population (n = 60).
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