IPSILATERAL MEASUREMENT OF THE ACOUSTIC REFLEX USING WIDEBAND POWER REFLECTANCE

Persistent Link:
http://hdl.handle.net/10150/613276
Title:
IPSILATERAL MEASUREMENT OF THE ACOUSTIC REFLEX USING WIDEBAND POWER REFLECTANCE
Author:
MACKENZIE, SARAH ANNA
Issue Date:
2016
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
The contraction of the stapedius muscle is known as the acoustic reflex (AR), which stiffens the ossicular chain/ tympanic membrane. Conventional immittance systems only evaluate changes in admittance for the 226 Hz probe tone with AR activation. Conversely, wideband power reflectance (WPR) provides information regarding energy reflected from the tympanic membrane across a broad frequency range, typically 200 to 6000 Hz. Thus, WPR has the potential to reveal more information regarding the effects of AR activation on sound passing through the middle ear. The purpose of this study was to determine if acoustic reflexes can be measured ipsilaterally (IPSI) by WPR using a novel protocol. Pure tone or broadband noise stimuli typically used for IPSI reflex recording could not be employed when measuring the reflex via WPR. This is because the levels needed to activate the AR for pure tone stimuli are much higher (85-100 dB SPL) than the chirp stimulus (62 dB SPL) and would thus contaminate the reflectance measure. Therefore, we used the WPR chirp stimulus as both the probe stimulus and reflex elicitor for our IPSI reflex measures. Ipsilateral AR thresholds measured using the wideband chirp stimulus were comparable to conventionally measured IPSI ARs. Our study demonstrates the potential of wideband power reflectance as a measure of the ipsilateral acoustic reflex using the chirp stimulus as both the probe and the elicitor.
Type:
text; Electronic Thesis
Degree Name:
B.S.
Degree Level:
Bachelors
Degree Program:
Honors College; Speech, Language, and Hearing Sciences
Degree Grantor:
University of Arizona
Advisor:
Velenovsky, David

Full metadata record

DC FieldValue Language
dc.language.isoen_USen
dc.titleIPSILATERAL MEASUREMENT OF THE ACOUSTIC REFLEX USING WIDEBAND POWER REFLECTANCEen_US
dc.creatorMACKENZIE, SARAH ANNAen
dc.contributor.authorMACKENZIE, SARAH ANNAen
dc.date.issued2016-
dc.publisherThe University of Arizona.en
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en
dc.description.abstractThe contraction of the stapedius muscle is known as the acoustic reflex (AR), which stiffens the ossicular chain/ tympanic membrane. Conventional immittance systems only evaluate changes in admittance for the 226 Hz probe tone with AR activation. Conversely, wideband power reflectance (WPR) provides information regarding energy reflected from the tympanic membrane across a broad frequency range, typically 200 to 6000 Hz. Thus, WPR has the potential to reveal more information regarding the effects of AR activation on sound passing through the middle ear. The purpose of this study was to determine if acoustic reflexes can be measured ipsilaterally (IPSI) by WPR using a novel protocol. Pure tone or broadband noise stimuli typically used for IPSI reflex recording could not be employed when measuring the reflex via WPR. This is because the levels needed to activate the AR for pure tone stimuli are much higher (85-100 dB SPL) than the chirp stimulus (62 dB SPL) and would thus contaminate the reflectance measure. Therefore, we used the WPR chirp stimulus as both the probe stimulus and reflex elicitor for our IPSI reflex measures. Ipsilateral AR thresholds measured using the wideband chirp stimulus were comparable to conventionally measured IPSI ARs. Our study demonstrates the potential of wideband power reflectance as a measure of the ipsilateral acoustic reflex using the chirp stimulus as both the probe and the elicitor.en
dc.typetexten
dc.typeElectronic Thesisen
thesis.degree.nameB.S.en
thesis.degree.levelBachelorsen
thesis.degree.disciplineHonors Collegeen
thesis.degree.disciplineSpeech, Language, and Hearing Sciencesen
thesis.degree.grantorUniversity of Arizonaen
dc.contributor.advisorVelenovsky, Daviden
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