The effects of phonetic complexity on vowel formant variability in apraxia of speech

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dc.contributor.advisorMarquardt, Thomas P.
dc.creatorKey-DeLyria, Sarah E.
dc.date.accessioned2017-06-23T19:10:52Z
dc.date.available2017-06-23T19:10:52Z
dc.date.issued2006-08
dc.description.abstractApraxia of speech (AOS) results from left anterior brain damage and is characterized by reduced intelligibility, inconsistent distortion errors and dysprosody. Few studies have systematically investigated speech errors in AOS, possibly due to the high individual variability in production. Analysis of contextual effects may help to describe the sources of variability and elucidate the underlying deficit in apraxia. The purpose of this study was to determine whether consonant complexity affects vowel formants in AOS. Participants repeated 36 consonant-vowel-consonant (CVC) syllables with manipulated consonantal complexity. Each syllable contained one of three vowels: /i/, /a/ or /u/. Acoustic analysis of vowel production by speakers with apraxia revealed formant frequencies within a normal range. Vowel formants in AOS were less stable with greater variability for /u/. Systemic effects of complexity on vowel formant variability in AOS were not observed. The lack of complexity effects suggests that speakers with AOS have disrupted access to syllabic encoding. Further investigation of complexity effects on vowel duration and vowel production variability in consonant-vowel-consonant-vowel (CVCV) contexts is warranted.en_US
dc.description.departmentCommunication Sciences and Disordersen_US
dc.format.mediumelectronicen_US
dc.identifierdoi:10.15781/T2F18SN2G
dc.identifier.urihttp://hdl.handle.net/2152/47317
dc.language.isoengen_US
dc.relation.ispartofUT Electronic Theses and Dissertationsen_US
dc.rightsCopyright © is held by the author. Presentation of this material on the Libraries' web site by University Libraries, The University of Texas at Austin was made possible under a limited license grant from the author who has retained all copyrights in the works.en_US
dc.rights.restrictionRestricteden_US
dc.subjectApraxia of speech (AOS)en_US
dc.subjectConsonant complexityen_US
dc.subjectVowel formantsen_US
dc.titleThe effects of phonetic complexity on vowel formant variability in apraxia of speechen_US
dc.typeThesisen_US
dc.type.genreThesisen_US
thesis.degree.departmentCommunication Sciences and Disordersen_US
thesis.degree.disciplineCommunication Sciences and Disordersen_US
thesis.degree.grantorUniversity of Texas at Austinen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Artsen_US

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