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Journal of Speech, Language, and Hearing Research Vol.42 915-924 August 1999.
© American Speech-Language-Hearing Association
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The Relationship Between Prelinguistic Vocalization and Later Expressive Vocabulary in Young Children With Developmental Delay

Rebecca B. McCathren 1
Paul J. Yoder 2

Steven F. Warren 2
1 University of Missouri Columbia
2 Vanderbilt University Nashville, TN

spedrm{at}showme.missouri.edu

This study tested the relationship between prelinguistic vocalization and expressive vocabulary 1 year later in young children with mild to moderate developmental delays. Three vocalization variables were tested: rate of all vocalization, rate of vocalizations with consonants, and rate of vocalizations used interactively. The 58 toddlers in the study were 17–34 months old, not sensory impaired, and had Bayley Mental Development Indices (Bayley, 1969; Bayley, 1993) from 35–85. In addition, the children had fewer than 3 words in their expressive vocabularies and during classroom observation each showed at least one instance of intentional prelinguistic communication before testing. Selected sections of the Communication and Symbolic Behavior Scales procedures (CSBS; Wetherby & Prizant, 1993) were administered at the beginning and at the end of the study. The vocal measures were obtained in the initial CSBS session. One measure of expressive vocabulary was obtained in the CSBS session at the end of the study. In addition, expressive vocabulary was measured in a nonstructured play session at the end of the study. We predicted that rate of vocalization, rate of vocalizations with consonants, and rate of vocalizations used interactively would all be positively related to later expressive vocabulary. The results confirmed the predictions.

KEY WORDS: prelinguistic communication, vocalization, communication development, developmental delay

Submitted on February 2, 1998
Accepted on December 22, 1998




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