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KMID : 1036820190240030707
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Communication Sciences & Disorders
2019 Volume.24 No. 3 p.707 ~ p.714
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Protophone Development at 4-6 Months and 7-9 Months of Age
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Jang Hyun-Sung
Ha Seung-Hee
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Abstract
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Objectives: The onset of canonical babbling is an important developmental precursor to spoken language. This study aimed to examine developmental patterns of protophones at 4-6 months and 7-9 months of age and test whether frequent protophones with formant transition at 4-6 months would predict the onset of canonical babbling at 7-9 months.
Methods: Vocalization samples using Language ENvironment Analysis (LENA) were obtained from 15 typically developing infants at 4-6 months and 7-9 months of age. Coders analyzed 20 five-minute segments with the highest child vocalization rate and determined the protophone type of each utterance. This study compared each protophone type at 4-6 months and 7-9 months. Infants were divided into the two groups who did or did not reach the canonical babbling stage. The study examined whether the two groups showed differences in the frequency of protophones with formant transition at 4-6 months and whether protophones with formant transition at 4-6 months have a close relationship with canonical babbling at 7-9 months.
Results: The results showed that canonical babbling increased significantly at 7-9 months compared to 4-6 months. The results indicated that infants who do and do not reach the canonical babbling stage at 7-9 months did not show any significant differences in the frequency of protophones with formant transition at 4-6 months, which had no significant relationship with canonical babbling at 7-9 months.
Conclusion: This study showed developmental patterns of protophones and suggests that most infants appear to begin canonical babbling suddenly rather than show gradual increases.
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KEYWORD
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Canonical babbling, Protophones, Formant transition, Korean-acquiring children
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