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Journal of Speech, Language, and Hearing Research Vol.52 1370-1379 October 2009. doi:10.1044/1092-4388(2009/07-0208)
© American Speech-Language-Hearing Association
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Research Note

Direct Magnitude Estimation of Articulation Rate in Boys With Fragile X Syndrome

David J. Zajac
Craniofacial Center, University of North Carolina at Chapel Hill

Adrianne A. Harris
Joanne E. Roberts
Gary E. Martin
FPG Child Development Institute, University of North Carolina at Chapel Hill

Contact author: David J. Zajac, University of North Carolina Craniofacial Center, CB No. 7450, Chapel Hill, NC 27599. E-mail: david_zajac{at}dentistry.unc.edu.

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 (F0) level, (c) sentence-final F0 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 F0 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.

KEY WORDS: fragile X syndrome, speaking rate, articulation rate, direct magnitude estimation, prosody


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