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KMID : 1036820160210020333
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Communication Sciences & Disorders
2016 Volume.21 No. 2 p.333 ~ p.342
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Articulatory Variability in 24- to 36-Month-Old Typically Developing Children
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Kim Hee-Yun
Ha Seung-Hee
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Abstract
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Objectives: This study aims to investigate the articulatory variability of word and phoneme production on spontaneous utterance samples in typically developing children age 24 to 36 months.
Methods: Speech samples were collected from 11 children age 24 to 30 months and 11 children age 31 to 36 months. Word variability, phoneme variability, percentage of consonants correct (PCC), and consonant inventory were measured. Eojeol was a basic unit for analysis of word variability. Both correct articulations and error productions were included for the variability analysis. Statistical analyses were conducted to investigate whether word and phoneme variability measures were different between the two age groups and if there were relationships between articulatory variability measures and PCC and consonant inventory.
Results: For the children age 24 to 30 months, 51.55% of Eojeols which were produced more than twice showed variable productions and 69% of consonants in the consonant inventory showed variability. For children age 31 to 36 months, word variability and phoneme variability were 36.45% and 52.45%, respectively. Both variability measures showed significantly negative correlation with PCC and consonant inventory.
Conclusion: This study suggests that 2-year-old children show progressively stable and consistent articulation patterns along with phonological acquisition. The results of this study have implications for evaluating the degree of articulatory variability in children who have inconsistent phonological disorders or childhood apraxia of speech.
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KEYWORD
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Word variability, Phoneme variability, Inconsistent phonological disorder, Two-year-old children’s phonological development, Spontaneous utterance sample analysis
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