Phonetics and Speech Sciences (말소리와 음성과학)

Korean Society of Speech Sciences (한국음성학회)
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Voice onset time in children with bilateral cochlear implants

양측 인공와우이식 아동의 성대진동시작시간 특성

  • Jeon, Yesol (Department of Communication Disorders, Ewha Womans University) ;
  • Lee, Youngmee (Department of Communication Disorders, Ewha Womans University)
  • 전예솔 (이화여자대학교 언어병리학과) ;
  • 이영미 (이화여자대학교 언어병리학과)
  • Received : 2022.05.09
  • Accepted : 2022.06.08
  • Published : 2022.06.30
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Abstract

This study aimed to investigate the voice onset time (VOT) of plosives in the VCV syllables by the place of articulation and phonation type spoken by children with bilateral cochlear implants (CIs) in comparison with children with typical hearing (TH). In all, 15 children with bilateral CIs and 15 children with TH participated in this study, aged between 5 to 10 years. All children produced 9 VCV syllables and their VOT were analyzed by the Praat software. There was no significant difference in mean VOT between children with bilateral CIs and children with TH. However, there was a significant difference in mean VOT by the place of articulation, such that the VOT for velars were longer than those for bilabials and alveolars. Additionally, there was a significant difference in mean VOT by the phonation type, such that the VOT of aspirated consonants were longer than those of lenis and fortis consonants. The results of this study suggest that children with bilateral CIs can distinguish the acoustic properties of plosive consonants and control the speech timing between the structures of the larynx and the oral cavity at a similar level as children with TH.

본 연구는 조기 양측 인공와우이식 아동과 건청 아동 간 파열음의 조음위치와 발성유형에 대한 성대진동 시작시간(voice onset time, VOT)의 차이를 살펴봄으로써, 조기 양측 인공와우이식을 통한 청각적 보상과 피드백이 청각장애 아동의 말 운동통제 능력에 미치는 영향을 살펴보고자 하였다. 대상자는 만 5세부터 10세 사이의 양측 인공와우이식 아동 15명과 건청 아동 15명을 선정하였다. 검사 과제는 조음위치 및 발성 유형을 고려한 9개 파열음의 VCV음절을 사용하였다. VOT 측정을 위해 Praat 프로그램을 사용하였으며, 정확한 측정을 위해 녹음된 음성, 스펙트로그램, 포먼트 정보를 함께 사용하였다. 삼원혼합분산분석 결과, 집단에 대한 주 효과는 유의하지 않았다. 조음위치에 대한 주 효과는 유의하였으며, 연구개음의 VOT값이 양순음과 치조음보다 유의하게 길었다. 발성유형에 대한 주 효과도 유의하였으며, VOT값은 격음, 평음, 경음 순으로 유의하게 길었다. 이러한 결과는 조기 양측 인공와우이식을 통한 양이 청취가 고도 이상의 난청 아동의 말 운동 통제 능력에 긍정적인 영향을 준다는 것을 시사한다.

Keywords

Acknowledgement

본 연구의 데이터 수집에 도움을 주신 김남규 선생님께 감사드립니다.

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