Bone-conduction auditory steady-state responses
department or school: Medicine, Faculty of
department or school: Audiology and Speech Sciences, School of
data provider: DSpace
degree campus: UBCV
creator: Small, Susan Anne
issued: 2011-02-03T21:45:22Z
issued: 2007
related degree: Doctor of Philosophy - PhD
degree grantor: University of British Columbia
description: The purpose of this dissertation was to determine whether multiple auditory-state responses (ASSRs) to bone-conduction stimuli can be used to investigate bone-conduction hearing, an essential part of any audiometric assessment. Infant bone-conduction testing methods, maturation of bone-conduction hearing, and ipsilateral/contralateral asymmetries in ASSRs were also assessed. The results show that bone-conduction ASSRs can be used to estimate thresholds in infants and adults with normal hearing. It was also found that choice of electroencephalogram (EEG) conditioning and processing can avoid spurious ASSRs due to aliasing. Non-auditory ASSRs (probably vestibular and indistinguishable from an auditory response) were also identified for high-intensity air-conduction stimuli (problematic when diagnosing residual hearing). Investigation of infant testing methods on bone-conduction threshold shows that: (i) bone-oscillator coupling method (elastic-band vs. hand-held) has no effect on threshold, (ii) use of different oscillator locations on the temporal bone does not affect threshold but a forehead placement results in elevated thresholds, and (iii) infants do not appear to have an occlusion effect (thus one can can assess with or without earphones). Young infants have much better low-frequency bone-conduction hearing compared to adults, which increases with maturation beyond 24 months of age. Infant bone-conduction hearing is slightly poorer in the high frequencies, improving significantly with age only at 2000 Hz. Within all infant groups, low-frequency thresholds are better than high-frequency thresholds; for adults, 500-Hz thresholds are poorer than high frequencies and there is no difference among thresholds above 500 Hz. Bone-conducted signals are much more effective for infants across frequency, especially at low frequencies. Normal levels for bone-conduction hearing in young and older infants are proposed. Ipsilateral/contralateral asymmetries in air- and bone-cond…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/31066
note: BONE-CONDUCTION AUDITORY STEADY-STATE RESPONSES by SUSAN ANNE S M A L L B.Sc, The University of British Columbia, 1986 M.Sc, Simon Fraser University, 1988 M.S., The University of Wisconsin-Madison, 1991 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS OF THE DEGREE OF DOCTOR OF PHILOSOPHY in THE F A C U L T Y OF G R A D U A T E STUDIES (Audiology and Speech Sciences) T H E UNIVERSITY OF BRITISH COLUMBIA March, 2007 © Susan Anne Small, 2007 Abstract The purpose of this dissertation was to determine whether multiple auditory-state responses (ASSRs) to bone-conduction stimuli can be used to investigate bone-conduction hearing, an essential part of any audiometric assessment. Infant bone-conduction testing methods, maturation of bone-conduction hearing, and ipsilateral/contralateral asymmetries in ASSRs were also assessed. The results show that bone-conduction ASSRs can be used to estimate thresholds in infants and adults with normal hearing. It was also found that choice of electroencephalogram (EEG) conditioning and processing can avoid spurious ASSRs due to aliasing. Non-auditory ASSRs (probably vestibular and indistinguishable from an auditory response) were also identified for high-intensity air-conduction stimuli (problematic when diagnosing residual hearing). Investigation of infant testing methods on bone-conduction threshold shows that: (i) bone-oscillator coupling method (elastic-band vs. hand-held) has no effect on threshold, (ii) use of different oscillator locations on the temporal bone does not affect threshold but a forehead placement results in elevated thresholds, and (iii) infants do not appear to have an occlusion effect (thus one can can assess with or without earphones). Young infants have much better low-frequency bone-conduction hearing compared to adults, which increases with maturation beyond 24 months of age. Infant bone-conduction hearing is slightly poorer in the high frequencies, improving significantly with age only at 2000 Hz.…
has type: Thesis/Dissertation
is shown at: 10.14288/1.0100422
language: eng
degree discipline: Audiology and Speech Sciences
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/31066