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Voice onset time hos svenska barn och vuxna: Ett utvecklingsperspektiv
Linköping University, Department of Clinical and Experimental Medicine.
Linköping University, Department of Clinical and Experimental Medicine.
2011 (Swedish)Independent thesis Advanced level (degree of Master (One Year)), 30 credits / 45 HE creditsStudent thesisAlternative title
Voice Onset Time among Swedish Children and Adults : a Developmental Perspective (English)
Abstract [sv]

Voice onset time (VOT) är en akustisk tidsparameter som reflekterar den tidsmässiga samordningen av talmotoriken. VOT betraktas som det mest pålitliga akustiska kännetecknet på huruvida en klusil är tonlös eller tonande.

Föreliggande studies syfte var att studera och jämföra VOT hos svenska barn (8, 9, 10, 11 år) och vuxna för att se hur utvecklingen sker samt för att ta fram svenska normvärden. Ljudinspelningar genomfördes på 150 barn och 36 vuxna vid uttal av de svenska klusilerna i minimala par. Akustiska analyser av materialet utfördes sedan.

Resultatet visade att de tonlösa klusilerna föreföll produceras med vuxenlika VOT-värden från och med cirka nio års ålder. De tonande motsvarigheterna producerades med vuxenlik VOT omkring tio års ålder. I tioårsåldern förekom dessutom förton i helt vuxenlik utsträckning. Resultaten tyder dock på att svenska vuxna ej nödvändigtvis behöver producera tonande klusiler med förton. Inga tydliga könsskillnader erhölls.

De normvärden för VOT som har tagits fram i föreliggande studie kan nyttjas som referensmaterial vid utredning av barn med talstörningar.

Abstract [en]

Voice onset time (VOT) is a temporal acoustic parameter, which reflects the timing of speech motor control. VOT is said to be the most reliable acoustic cue of whether a plosive is voiceless or voiced.

The aim of the present study was to investigate and compare VOT among Swedish children (8, 9, 10, 11 years) and adults to examine the development of VOT and to obtain Swedish normative data. Audio recordings were performed on 150 children and 36 adults when pronouncing the Swedish plosives in minimal pairs. Acoustic analyses were then carried out.

The results indicated that the voiceless plosives seemed to be produced with adult like VOT-values around the age of nine. The voiced plosives in turn, appeared to be produced with adult like values at approximately ten years of age. By the age of ten, also prevoicing was found in a fully adult like extent. Though, the results indicate that not all Swedish adults produce voiced plosives with prevoicing. No evident gender differences were found.

The normative data for VOT that have been obtained in the present study can be used as normative data when assessing children with speech disorders.

Place, publisher, year, edition, pages
2011. , 53 p.
Keyword [en]
Voice onset time, children and adults, development, normative data
Keyword [sv]
Voice onset time, svenska barn och vuxna, utveckling, normvärden
National Category
Otorhinolaryngology
Identifiers
URN: urn:nbn:se:liu:diva-68630ISRN: LIU-IKE/SLP-A--11/010--SEOAI: oai:DiVA.org:liu-68630DiVA: diva2:421461
Subject / course
Master (one year thesis)/Speech and Language Pathology
Presentation
2011-05-23, Terassen, Linköping, 09:00 (Swedish)
Uppsok
Medicine
Supervisors
Examiners
Available from: 2011-06-09 Created: 2011-05-24 Last updated: 2011-06-09Bibliographically approved

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