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KMID : 1036820170220030435
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Communication Sciences & Disorders
2017 Volume.22 No. 3 p.435 ~ p.444
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Longitudinal Study of Vocal Development in 9- to 18-Month-Old Children Acquiring Korean
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Ha Seung-Hee
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Abstract
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Objectives: This study investigated the developmental trajectory of early vocalizations in 9- to 18-month-old children acquiring Korean based on the proportion of vocalization types.
Methods: Audio samples were collected from 13 typically-developing children in Korean monolingual environments at 9, 12, 15, and 18 months. Audio samples were seg-mented into each vocalization based on breath group or 2 seconds of silence between vocalizations. Each vocalization was broadly classified as a precanonical or canonical vocalization and then categorized according to the 8 subtypes of vocalization. The proportion of each subtype was obtained, and changes in the proportion of subtypes from 9 to 18 months were investigated.
Results: The proportion of precanonical vocalizations was higher than those of canonical vocalization including consonants and syllable structures at 9 and 12 months and subsequently, the proportions of precanonical vocalizations decreased and were lower than those of canonical vocalizations. Among the eight subtypes of vocalizations, fully resonant sounds, canonical babblings, variegated babblings, multiple syllable babblings and jargon showed significant differences across ages.
Conclusion: This study suggested that the status of early speech development can be examined based on onset and types of syllable structures in early vocalization. The study discussed that Korean-spe-cific characteristics might exist in early vocalization.
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KEYWORD
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Early vocalizations, Babblings, 9 to 18 months, Longitudinal study, Typically developing Korean children
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