Document Type

Article

Language

eng

Format of Original

7 p.

Publication Date

8-2009

Publisher

American Speech-Language-Hearing Association

Source Publication

Journal of Speech, Language, and Hearing Research

Source ISSN

1092-4388

Original Item ID

doi: 10.1044/1092-4388(2009/08-0001)

Abstract

Purpose: To compare the phonological accuracy and speech intelligibility of boys with fragile X syndrome with autism spectrum disorder (FXS-ASD), fragile X syndrome only (FXS-O), Down syndrome (DS), and typically developing (TD) boys.

Method: Participants were 32 boys with FXS-O (3–14 years), 31 with FXS-ASD (5–15 years), 34 with DS (4–16 years), and 45 TD boys of similar nonverbal mental age. We used connected speech samples to compute measures of phonological accuracy, phonological process occurrence, and intelligibility.

Results: The boys with FXS, regardless of autism status, did not differ from TD boys on phonological accuracy and phonological process occurrence but produced fewer intelligible words than did TD boys. The boys with DS scored lower on measures of phonological accuracy and occurrence of phonological processes than all other groups and used fewer intelligible words than did TD boys. The boys with FXS and the boys with DS did not differ on measures of intelligibility.

Conclusions: Boys with FXS, regardless of autism status, exhibited phonological characteristics similar to those of younger TD children but were less intelligible in connected speech. Boys with DS showed greater delays in all phonological measures than the boys with FXS and the TD boys.

Comments

Accepted version. Journal of Speech, Language, and Hearing Research, Vol. 52, No. 4 (August 2009): 1045-1061. DOI. © American Speech-Language-Hearing Association 2009. Used with permission.

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