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Journal of Speech and Hearing Research Vol.37 1151-1177 October 1994.
© American Speech-Language-Hearing Association
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Developmental Phonological Disorders III

Long-Term Speech-Sound Normalization

Lawrence D. Shriberg 1
Frederic A. Gruber 1

Joan Kwiatkowski 1
1 University of Wisconsin-Madison

shriberg{at}waisman.wisc.edu

Prior articles in this series provide a descriptive profile of 178 children with developmental phonological disorders (Shriberg & Kwiatkowski, 1994) and predictive correlates of short-term speech-sound normalization in 54 children (Shriberg, Kwiatkowski, & Gruber, 1994). The present article reports findings from a study of 10 children with developmental phonological disorders whose progress was followed at least once yearly for 7 years. Analyses characterize the sequence, rates, and error patterns of long-term speech-sound normalization in relation to developmental perspectives on the nature of children's phonological disorders. Findings are interpreted to support the hypothesis of a critical period for speech-sound development, with long-term normalization of significant speech delay reaching a chronological age boundary at approximately 8.5 years.

KEY WORDS: phonology, disorders, prosody, developmental, prediction

Submitted on April 6, 1993
Accepted on March 31, 1994






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