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Audiology and Speech Research > Volume 13(4); 2017 > Article
Audiology and Speech Research 2017;13(4): 335-344.
Published online: October 31, 2017.
doi: http://doi.org/10.21848/asr.2017.13.4.335
인공와우 이식 아동의 자음변별과 발성개시 시간
박병미1, 최성희1,2,3, 최철희1,2,3
1대구가톨릭대학교 바이오메디대학 언어청각치료학과
2대구가톨릭대학교 생체모방감각제어연구소
3대구가톨릭대학교 가톨릭 청각음성언어센터
Consonant Discrimination and Voice Onset Time in Children with Cochlear Implants
Byung-Mi Park1, Seong Hee Choi1,2,3, Chul-Hee Choi1,2,3
1Department of Audiology and Speech-Language Pathology, Daegu Catholic University, Gyeongsan, Korea
2Research Institute of Biomimetic Sensory Control, Daegu Catholic University, Gyeongsan, Korea
3Catholic Hearing Voice Speech Center, Daegu Catholic University, Gyeongsan, Korea
Correspondence  Chul-Hee Choi ,Tel: +82-53-850-2541, Fax: +82-53-359-0780, Email: cchoi@cu.ac.kr
Received: October 2, 2017; Revised: October 17, 2017   Accepted: October 18, 2017.  Published online: October 31, 2017.
The present study compared the Korean consonant discrimination ability and voice onset time (VOT) between children with cochlear implants (CI) and children with normal hearing to investigate the characteristics of speech in children with CI.
Twenty children with CI and twenty children with normal hearing participated in the present study. Of twenty children with CI, ten subjects had the CI surgery before three years old and the other ten subjects had after three years old. One-syllable stimuli (consonant-vowel) and twosyllable stimuli (vowel-consonant -vowel) were used to test the consonant discrimination and VOT, respectively. The consonant discrimination test was analyzed by manner of articulation (stop, fricative, affricate), place of articulation (bilabial, alveolar, palatal, velar), and voicing (lax, tense, aspirated), and VOT was analyzed by voicing.
For consonant discrimination, children with normal hearing showed significantly better recognition than children with CI in all the consonants. For the manner of articulation, the differences were significantly highest discrimination in affricates and lowest in stops. For the place of articulation, the differences were significantly highest in palatals and lowest in bilabials. However, there was no difference based on voicing between groups. For consonant discrimination between children with CI implantation before 3-years old and children with CI implantation after 3-years old, there were significant differences in the manner and the place of articulation whereas no difference was found in VOT. No relationship was found between the wearing periods of CI whereas age at implantation was highly correlated with consonant discrimination. For VOT, there were no significant differences in all stop sounds but the lowest discrimination was observed in stops.
The characteristics of speech in children with CI were apparent in the manner and the place of articulation but not in voicing. This was highly associated with ages of CI.
Key Words: Cochlear implants, Consonant discrimination, Voice onset time, Auditory training.
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