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J Speech Lang Hear Res. 2009 Oct;52(5):1370-9. doi: 10.1044/1092-4388(2009/07-0208). Epub 2009 Aug 28.

Direct magnitude estimation of articulation rate in boys with fragile X syndrome.

Author information

1
University of North Carolina Craniofacial Center, Chapel Hill, NC, USA. david_zajac@dentistry.unc.edu

Abstract

PURPOSE:

To compare the perceived articulation rate of boys with fragile X syndrome (FXS) with that of chronologically age-matched (CA) boys and to determine segmental and/or prosodic factors that account for perceived rate.

METHOD:

Ten listeners used direct magnitude estimation procedures to judge the articulation rates of 7 boys with FXS only, 5 boys with FXS and a diagnosis of autism spectrum disorder (ASD), and 12 CA boys during sentence repetition. Sentences had similar articulation rates in syllables per second as determined acoustically. Four segmental/prosodic factors were used to predict perceived rate: (a) percentage consonants correct, (b) overall fundamental frequency (F(0)) level, (c) sentence-final F(0) drop, and (d) acoustically determined articulation rate with the final word of the sentence excluded.

RESULTS:

Boys with FXS and ASD were judged to talk faster than CA controls. Multiple linear regression indicated that articulation rate with the final word of the sentence excluded and sentence-final F(0) drop accounted for 91% of the variance for perceived rate.

CONCLUSIONS:

Descriptions of speakers with FXS as having fast and/or fluctuating articulation rates may be influenced by autism status. Also, atypical sentence-final prosody may be related to perceived rate in boys with FXS and ASD.

PMID:
19717654
PMCID:
PMC2858968
DOI:
10.1044/1092-4388(2009/07-0208)
[Indexed for MEDLINE]
Free PMC Article

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