Phonetics and Speech Sciences (말소리와 음성과학)

Korean Society of Speech Sciences (한국음성학회)
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A comparative study of coarticulation features between children with and without reading disability

읽기장애아동과 일반아동의 동시조음 특성 비교

  • 박성숙 (충남대학교 언어병리학과) ;
  • 성철재 (충남대학교 언어학과)
  • Received : 2024.04.27
  • Accepted : 2024.06.10
  • Published : 2024.06.30
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Abstract

Coarticulation is affected by the continuous movement of the articulator within a limited time and space through the neighboring segments and various overlaps. This study investigated the differences in coarticulation characteristics of children with reading disabilities and nondisabled children in CVC and VCV syllables consisted of stops, affricates, and vowels (a, i, u). The subjects were 13 children with reading disabilities and nondisabled children in the 2nd to 6th grades in elementary school. Two second formants were measured. One was measured at the point where the vowel began, and the other was measured at the mid point of the vowel stable section. Regression analysis was performed with F2 onset and F2 of the following vowel to obtain the locus equation (LE). 3-way ANOVA was conducted to the slope of the LE according to the groups (reading disabilities vs. nondisabled), places of articulation, and phonation types. In CVC syllable, dyslexic children showed a flatter slope than nondisabled children. With respect to the places of articulation, velar or bilabial sounds showed steeper LE slope than alveolar or palatal sounds. There were no main effects regarding group and phonation types variable for VCV syllable, and the significant differences in the places of articulation were also differed from the results for the CVC syllables. This study confirmed that dyslexic children showed a different pattern of coarticulation slope depending on the syllable structure. We also found that the higher pause rate of the dyslexic children had a stronger effect on the coarticulation in VCV structures.

동시조음은 제한된 시간과 공간 안에서 연속적인 조음기관의 움직임으로 인해 주위의 분절음과 다양한 중첩을 통해 서로 영향을 주고받는 것이다. 본 연구는 파열음, 파찰음과 모음(ᅡ, ᅵ, ᅮ)으로 구성된 CVC 음절과 VCV 음절에서 읽기장애아동과 일반아동의 동시조음 특성 차이를 규명하였다. 연구대상자는 초등학교 2-6학년 읽기장애아동 13명과 일반아동 13명이었다. 읽기과제 음성 자료를 이용해 자음이 끝나고 모음이 시작되는 지점과 모음 안정 구간의 중간 지점에서 제 2 포먼트를 측정하였다. 측정된 제 2 포먼트를 이용해 회귀분석을 실시해 집단별 조음위치, 발성유형에 따라 로커스방정식(LE) 기울기를 구하여 삼원분산분석(3-way ANOVA)을 실시하였다. CVC 음절에서 읽기장애아동은 일반아동에 비해 작은 LE 기울기 값을 보였다. 조음위치에서는 연구개음이나 양순음이 치조음이나 경구개음과 비교해 더 가파른 LE 기울기를 보였다. VCV 음절에서는 집단, 발성유형에서 유의미한 차이를 보이지 않았으며 조음위치에서 보인 유의미한 차이도 CVC 음절 결과와 다른 양상을 보였다. 본 연구는 읽기장애아동이 음절구조에 따라 다른 양상의 동시조음 기울기를 보인다는 것과 읽기장애 아동의 높은 휴지 비율은 VCV 구조에서 동시조음에 더 큰 영향을 미친다는 것을 확인하였다.

Keywords

Acknowledgement

이 연구는 2022년도 충남대학교 학술연구비의 지원을 받아 수행되었습니다.

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