한국어 아동지향어에서의 고모음 무성음화: 음장의 매개효과
High Vowel Devoicing in Korean Child-Directed Speech as Mediated by Vowel Duration
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This study seeks to advance our understanding of child-directed speech (CDS) by examining patterns of Korean high vowel devoicing (HVD) in relation to speech register. Ten mothers, engaging in book reading and spontaneous speech, taught both novel and existing words to their own child (mean age = 13 months) and an adult. We noted a lower rate of HVD in CDS compared to adult-directed speech (ADS), potentially contributing to infants' acquisition of vowel contrasts. The impact of speech register on HVD rates, however, was not a direct effect but was entirely mediated by vowel duration. CDS displayed longer vowel durations than ADS, and prolonged vowels were found to be less susceptible to HVD. Significantly, when the register was incorporated into a statistical model alongside duration, its influence on the rate of HVD became statistically non-significant. Furthermore, we identified the effect of vowel position within the utterance on HVD occurrence. Notably, the final position, characterized by the longest vowel duration, exhibited the highest susceptibility to HVD. This observation challenges the exclusive classification of HVD as a phonetic process, suggesting instead that HVD is a phonological phenomenon with inherent phonetic properties.
Abstract
This study seeks to advance our understanding of child-directed speech (CDS) by examining patterns of Korean high vowel devoicing (HVD) in relation to speech register. Ten mothers, engaging in book reading and spontaneous speech, taught both novel and existing words to their own child (mean age = 13 months) and an adult. We noted a lower rate of HVD in CDS compared to adult-directed speech (ADS), potentially contributing to infants' acquisition of vowel contrasts. The impact of speech register on HVD rates, however, was not a direct effect but was entirely mediated by vowel duration. CDS displayed longer vowel durations than ADS, and prolonged vowels were found to be less susceptible to HVD. Significantly, when the register was incorporated into a statistical model alongside duration, its influence on the rate of HVD became statistically non-significant. Furthermore, we identified the effect of vowel position within the utterance on HVD occurrence. Notably, the final position, characterized by the longest vowel duration, exhibited the highest susceptibility to HVD. This observation challenges the exclusive classification of HVD as a phonetic process, suggesting instead that HVD is a phonological phenomenon with inherent phonetic properties.
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