Lexical tone identification in Childhood Apraxia of Speech: Two case studies
Refereed conference paper presented and published in conference proceedings

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Despite childhood apraxia of speech (CAS) being a motor speech disorder, children with CAS also have difficulty in a number of perceptual domains, such as discriminating segments, rhythm and sequences of phonemes. Current studies have not investigated how children with CAS identify lexical tones which is a based on the perception of the level and contour of fundamental frequencies. This study provides preliminary findings to understand the ability of children with CAS in identifying lexical tones in single word level.

Two Cantonese-speaking children with CAS aged 3;07 and 6;06 were tested using a standardized test of lexical tone identification, Cantonese Tone Identification Test (CANTIT; Lee, 2012). Further analysis was conducted to investigate whether there are any patterns in discriminating different tone pair contrast.

The results showed that both children had significant difficulties in identifying lexical tones in Cantonese. The Z-scores of both children were <-1.35 and <-2.90 respectively which belonged to the lowest rank of their age group in the test. Further analysis of the tone pair contrasts did not show any consistent error patterns.

This study provided preliminary findings on the ability of identifying Cantonese lexical tones in children with CAS. Results showed that children with CAS may have difficulties in identifying lexical tones. This corroborate the findings of perceptual difficulties as well as motor difficulties in children with CAS. The results also provide support on the clinical observations of having deficits in perceiving and producing lexical tones in Cantonese-speaking children with CAS. The current study motivated further investigations of lexical tone identification in children with CAS with a larger sample size.
All Author(s) ListWong E. C. H., Lee K. Y. S.
Name of ConferenceHong Kong Speech and Hearing Symposium 2018
Start Date of Conference01/11/2018
End Date of Conference04/11/2018
Place of ConferenceHong Kong
Country/Region of ConferenceHong Kong
Proceedings TitleHong Kong Speech and Hearing Symposium 2018
LanguagesEnglish-United States
Keywordsspeech therapy, Apraxia

Last updated on 2019-10-06 at 12:21