아동지향어와 성인지향어에 나타나는 파열음의 음향적 특성

Abstract

As the generation changes, the sound of Korean Stops is changing. People in 70~80s distinguish lenis and aspirated sounds by Voice Onset Time (VOT). However in 20s, there is little difference between stops in Voice Onset Time, and f0 has become a means of separating the two sounds. Also, f0 has been shown to be used as a means of distinctly distinguishing stops, especially among young women. Prior studies have mostly been conducted only with Seoul speaker. Therefore, we investigated how sound changes in the Korean stops found in prior research that are realized in Adult directed speech (ADS) and Child directed speech (CDS). We also investigated whether there is a difference between VOT and f0 when mothers speak ADS and CDS, and whether the acoustic characteristics found in mothers' speech can be applied to babies' acquisition of Korean Stops. Results showed that mothers use f0 as primary cue to discriminate Korean Stops. However, they also use VOT as secondary cue when talking to their child, and the VOT of lenis consonants was enhanced when mothers reading the target words as opposed to casually presenting them. Although the role of f0 was greater than VOT in discriminating stops in CDS, we concluded that mothers use both the primary cue and secondary cue to help their child learning stops.