ORIGINAL ARTICLE Commun Sci Disord. 1999;4(1): 1-24.
 The Development of Korean /s/ (/ㅅ/) and /s'/ (/ㅆ/) in Normal Children of Ages 2-7 Years Hee Jung Cheon , and Seung Hwan Lee Copyright ©1999 The Korean Academy of Speech-Language Pathology and Audiology 전희정(Hee Jung Cheon)| 이승환(Seung Hwan Lee) Share : ABSTRACT The purpose of this study was to investigate the process of acquisition and development of / s/ (lax) and / s / (tense), which are most frequently substituted Korean speech sounds by children with articulatory-phonological disorder s. Two hundred and eighty- six subject s aged 2- 7 year s old participated In the study. Sixty picture cards were used to elicit the children s productions of four Korean sounds, [ ], [ ], [s], and [s ], which correspond to the allophonic realizations of the two Korean sounds / s/ and / s / . All the test procedures were tape- recorded and the responses of all subject s were evaluated by two examiner s. The result s of the present study can be summarized as follows : (1) The developmental sequential order of the target sounds were found to be [ ], [ ], [s], and [s ]; (2) It was found that the target sounds were acquired fir st in the initial position of the syllable preceding / i/ ; (3) In terms of omissions and substitutions, the fricative consonant s in concern are fir st omitted, and then substitutions with either alveolar stops (/ t/ , / t / , or / th/ ) or affricates (/ c/ , / c / , or / ch/ ) occur , which is followed by the substitutions with palatalized fricatives (/ / or / / ). In the next stage, the interdental fricative of / / substitutes for / s/ or / s /.
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