ORIGINAL ARTICLE
Commun Sci Disord. 2017;22(4): 772-783.
Published online December 31, 2017.
doi: https://doi.org/10.12963/csd.17448
Variability of Speech Sound Production according to Phonetic Complexity in Children with and without Speech Sound Disorders
Eun-Ji Hana , and Ji-Wan Hab
aDepartment of Rehabilitation Science, Graduate School, Daegu University, Gyeongsan, Korea
bDepartment of Speech Pathology, Daegu University, Gyeongsan, Korea
Corresponding Author: Ji-Wan Ha ,Tel: +82-53-850-4327, Fax: +82-53-850-4329, Email: jw-ha@daegu.ac.kr
Received October 5, 2017  Revised: November 16, 2017   Accepted November 20, 2017
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ABSTRACT
Objectives
This study investigated the proportion of articulatory errors, variation of articulatory production, variation of articulatory errors, and deviation of reaction time according to phonetic complexity in children with and without speech sound disorder (SSD).
Methods
The study subjects were 20 SSD children and 60 typically developing (TD) children from 3 to 6 years of age. Subjects produced words with high and low phonetic complexity four times. Subjects’ responses were recorded using DmDX display software for measuring articulatory variability.
Results
In the TD group, proportion of articulatory errors, variation of articulatory production, variation of articulatory errors, and deviation of reaction time were lower as age increased; and the four types of measures of variability were higher at the ‘high’ level than in the ‘low’ level of phonetic complexity. The SSD group showed a higher proportion of articulatory errors and higher variation of articulatory errors than the chronological age (CA)-matched children group. In the SSD group, all types of measures of variability were higher at the ‘high’ level than in the ‘low’ level of phonetic complexity as in the CA group.
Conclusion
Articulatory variability is not purely a characteristic of the ‘inconsistent phonological disorder’ group, but a more general symptom of both TD and SSD children. Thus, different kinds of variables among these groups have to be more fully analyzed.
Keywords: Speech sound disorder | Articulatory variability | Phonetic complexity
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