Influence of Upper Frequency Boundary on Consonant Perception in Normal Hearing and Cochlear Implant Adults

• 영문명: Influence of Upper Frequency Boundary on Consonant Perception in Normal Hearing and Cochlear Implant Adults
• 발행기관: 한국청각언어재활학회
• 저자명: Son-A Chang,Min-Hyun Park,Seung-Ha Oh,Kyung-Min Lee
• 간행물 정보: 『Audiology and Speech Research』Audiology and Speech Research 제13권 제3호, 231~238쪽, 전체 8쪽
• 주제분류: 사회과학 > 교육학
• 파일형태: PDF
• 발행일자: 2017.07.31

영문 초록

Purpose: Although some studies argue that it is worthy for cochlear implant (CI) users to have frequency information above 3,000 Hz for consonant recognition, it is not clear whether CI patients make use of this information, especially in Korean. In this experiment, we tested whether consonant recognition in CI patients depended on the utilization of information from 3,000 to 8,000 Hz. Methods: We conducted consonant recognition tests in Korean [3 syllable structures: vowel-consonant-vowel (VCV), consonant-vowel (CV), and vowelconsonant (VC)] pronounced by one male and one female speakers for 3 normal hearing (NH) and 3 CI adults with 9 low-pass filtering frequency conditions. Results: Both groups showed decreased correction scores as cut-off frequency getting lower. CI subjects scored twice errors to NH subjects across frequency conditions. The cut-off frequency of 1,500 Hz brought a significant decrease of consonant recognition. Consonants in VCV syllable recognized better than VC and CV syllable in both groups. Fricatives and affricates in the manner of articulation and alveolar and palatal in the place of articulation are the ones that benefit from high frequency coding. Alveolar plosive sounds were most difficult sounds in both groups and this confirms previous studies of consonant recognition in Korean. Conclusion: NH and CI groups demonstrated poorer consonant recognition as cut-off frequency decreased with relatively large decrements of CI group. The information above 3,000 Hz conveys little information for consonant recognition in the normal and CI subjects while some CI subjects utilized information up to 6,000 Hz. There were large individual differences, particularly in CI group.

목차

INTRODUCTION

MATERIALS AND METHODS

RESULTS

DISCUSSIONS

REFERENCES

키워드

Frequency information,Consonant perception,Cochlear implant