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Journal of Speech, Language, and Hearing Research Vol.45 1188-1201 December 2002. doi:10.1044/1092-4388(2002/096)
© American Speech-Language-Hearing Association
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The Interaction of Ambient Frequency and Feature Complexity in the Diphthong Errors of Children With Phonological Disorders

Stephanie F. Stokes 1
Jessica Tse-Kay Lau 1

Valter Ciocca 1
1 University of Hong Kong China

s.stokes{at}unn.ac.uk

This study examined the interaction of ambient frequency and feature complexity in the diphthong errors produced by Cantonese-speaking children with phonological disorders. A total of 611 diphthongs produced by 13 Cantonese-speaking children with speech disorders were subjected to perceptual analysis. The percentage accuracy of production and error patterns was examined. Perceptual analysis showed that /i/ and /ui/ were most frequently in error, whereas /ei/, /ou/, and /u/ were least frequently in error. Diphthong errors (usually diphthong reduction) arise as a function of both ambient frequency and feature complexity. The combination of ambient frequency and feature complexity yields a complexity metric reflecting accuracy of production. Treatment guidelines include consideration of three basic factors: ambient frequency, feature complexity, and error patterns.

KEY WORDS: diphthongs, Cantonese, phonological disorders

Submitted on January 14, 2002
Accepted on June 24, 2002


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