Evoked potential correlates of temporal auditory processing disorders and developmental language delay in school-agend children

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dc.contributor.advisorEggermont, Jos J.
dc.contributor.authorMuir, Patricia J.
dc.date.accessioned2017-12-18T22:34:55Z
dc.date.available2017-12-18T22:34:55Z
dc.date.issued2012
dc.descriptionBibliography: p. 264-287en
dc.descriptionSome pages are in colour.en
dc.descriptionIncludes copies of ethics approval and copyright permissions. Original copies with original Partial Copyright Licence.en
dc.description.abstractThe theory that a fundamental deficit in the cortical processing of rapid, successive sensory events underlies neurodevelopmental disorders such as specific language impairment (SLI) and specific reading disability ( dyslexia) has been intensely debated for over 30 years. The present study compares behavioural performance on a range of auditory processing, reading/language, speech perception, auditory and visual temporal measures, with multichannel obligatory auditory evoked potential (AEP) responses to continuous and interleaved click train stimuli, and a /ba./-/pa./ speech continuum in normal learning children vs. children with learning disabilities ( aged 9 -17 years). In spite of strong behavioural evidence for temporal and auditory processing difficulties in the experimental group, the AEP results show a maturational lag in younger subjects but neural representation for temporal events of 19 ms duration for groups of four click trains, and 20 ms for voice-onset time gaps in a speech continuum, which is below the categorical boundary for perception of consonants. The double-on response to voice­onset time was not readily identifiable in many children. Adaptation of the auditory response was essentially normal in all children but there were subtle effects suggesting that refinements in the auditory response were still occurring. Maturational status of the brain profoundly influences the morphology of AEPs, especially in children 12 years and under. Experimental and control children did not differ significantly on many of the electrophysiological measures but younger experimental children differed from adult endpoints. Older experimental children differed frequently from adults in the N2 component. Relationships between the behavioural and electrophysiological measures were linked through maturational processes. Although rapid repetition rates are more challenging for an immature auditory system, there are subtle changes occurring into adolescence even for slower stimuli rates, paralleling the lengthy development of auditory pathway, which is contrary to the temporal processing hypothesis. The presence of a co-occurring auditory processing impairment is consistent with abnormal cortical maturation and not a temporal processing disorder of auditory cortex.
dc.format.extentxi, 297 leaves : ill. ; 30 cm.en
dc.identifier.citationMuir, P. J. (2012). Evoked potential correlates of temporal auditory processing disorders and developmental language delay in school-agend children (Doctoral thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/4928en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/4928
dc.identifier.urihttp://hdl.handle.net/1880/105929
dc.language.isoeng
dc.publisher.institutionUniversity of Calgaryen
dc.publisher.placeCalgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.
dc.titleEvoked potential correlates of temporal auditory processing disorders and developmental language delay in school-agend children
dc.typedoctoral thesis
thesis.degree.disciplinePsychology
thesis.degree.grantorUniversity of Calgary
thesis.degree.nameDoctor of Philosophy (PhD)
ucalgary.item.requestcopytrue
ucalgary.thesis.accessionTheses Collection 58.002:Box 2115 627942985
ucalgary.thesis.notesUARCen
ucalgary.thesis.uarcreleaseyen
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