Phonetics and Speech Sciences (말소리와 음성과학)

Korean Society of Speech Sciences (한국음성학회)
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A comparative study of the acoustic characteristics of the vowel /a/ between children with spastic and dyskinetic cerebral palsy

경직형과 불수의운동형 뇌성마비아동의 /아/ 모음 음향학적 비교

  • Jeong, Pil Yeon (Ewha Womans University Center for Child Development and Disability) ;
  • Sim, Hyun Sub (Department of Communication Disorders, Ewha Womans University)
  • 정필연 (이화여자대학교 아동발달센터) ;
  • 심현섭 (이화여자대학교 언어병리학과)
  • Received : 2020.01.31
  • Accepted : 2020.03.16
  • Published : 2020.03.31
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Abstract

This study aims to compare the acoustic characteristics of vowel phonation in children with spastic and dyskinetic cerebral palsy (CP). Thirty-four children aged 4-12 years with CP participated in the study (spastic 26, dyskinetic 8). Voice samples for the acoustic analysis were extracted from a sustained vowel /a/. All acoustic measures were made using Praat. Group differences were compared by an independent t-test or Welch-Aspin test, if the equivalence assumption was not met. The results of this study are as follow. First, maximum phonation time(MPT) was significantly shorter for the dyskinetic CP than for the spastic CP. Second, shimmer percent was significantly increased in the dyskinetic CP than in the spastic CP. Lastly, there were no significant group differences in both the first formant and the second formant. These findings indicate that the dyskinetic CP has a poorer respiratory capacity and poorer laryngeal function than the spastic CP. On the other hand, both groups have a comparable ability to articulate the vowel /a/. The results of the present study help speech language pathologists identify the speech motor control ability of children with two types of CP (spastic and dyskinetic) and help to make an intervention plan associated with a specific type of CP.

본 연구의 목적은 경직형과 불수의운동형 뇌성마비 아동의 음향학적 특성에서 차이가 있는지 알아보는 것이다. 연구대상은 만 4~12세의 뇌성마비 아동 34명이 참여하였다(경직형 26명, 불수의운동형 8명). 연구과제는 모음 '아' 연장발성하기이고, Praat을 사용하여 MPT, F0, Jitter, Shimmer, NHR과 F1, F2를 측정하였다. 두 유형 간 음향학적 차이를 알아보기 위해 두 독립표본 t-검정과 등분산가정이 충족되지 않는 경우 Welch-Aspin 검정을 사용하여 통계분석을 실시하였다. 연구결과, 첫째, 경직형 뇌성마비아동에 비해 불수의운동형에서 유의하게 낮은 MPT를 나타내었다. 둘째, Shimmer에서 불수의운동형의 측정치가 유의하게 높았다. 셋째, F1과 F2에서는 두 유형 간에 유의한 차이를 보이지 않았다. 이러한 결과는 경직형에 비해 불수의운동형의 호흡능력과 호흡조절능력이 더 제한적이고, 음성의 불안정성과 불규칙성도 더 많이 나타난다는 것을 시사한다. 본 연구의 결과는 뇌성마비 유형 간 말운동통제능력의 차이를 확인하고, 유형에 따른 중재계획을 수립하는데 필요한 정보를 제공해 줄 수 있을 것이다.

Keywords

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