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KMID : 1036820200250020441
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Communication Sciences & Disorders
2020 Volume.25 No. 2 p.441 ~ p.457
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Developmental Study of Distortion Errors in Affricative, Fricative, and Liquid Sounds
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Kim Mi-Jin
Ryu Eun-Joo
Ha Ji-Wan
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Abstract
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Objectives: This study attempted to examine the developmental process in detail by comparing the distortion error rates and error patterns of affricative, fricative, and liquid sounds; which are later developing speech sounds in Korean and exhibit many errors.
Method: A Urimal Test of Articulation and Phonology 2 (UTAP2) word-level test was performed on 556 typically developing children aged 2-7 years. We compared the error rates and error patterns in words containing affricate, fricative, and liquid sounds among age groups.
Results: First, the error rates decreased significantly in older age groups and there were significant differences depending on age. As age increased, error rates decreased in the order of initial /l/, /?*/, /?/, /?h/, final /l/, /s*/, and /s/. Second, regarding error patterns, the affricatives began with substitution and developed through the stopping process. The fricatives developed through the process of substitution and interdentalization/dentalization, and the liquids developed through omission and weakening.
Conclusion: The results of this study showed the development and acquisition process of speech sounds by analyzing error patterns; focusing on distortion errors of affricative, fricative, and liquid sounds in a sufficient amount of data from each groups. This will provide useful information to guide a gradual approach towards a target phoneme in the intervention of children with speech sound disorders.
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KEYWORD
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Affricative sound, Fricative sound, Liquid sound, Distortion, Speech error rate, Speech error patterns
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