인공와우 착용자의 주파수 여과에 따른 일음절 재인 능력

서지정보

ㆍ발행기관 : 한국청각언어재활학회 ㆍ수록지정보 : 청능재활 / 3권 / 1호
ㆍ저자명 : 장현숙, 이지연, 유수연, ·정은조, 박홍준

목차

INTRODUCTION
MATERIALS AND METHODS
RESULTS
DISCUSSIONS
CONCLUSIONS
REFERENCES

한국어 초록

인공와우 착용인들은 청신경의 직접적인 전기적인 자극으로 상당한 청각능력(audibility)을 가지므로 말지각 능력에 향상된 결과를 보이고 있음에도 불구하고 청력에 비하여 말지각 능력이 훨씬 못 미치는 경향이 있다. 이것은 인공와우 착용인의 말지각 어려움이 청력(audibility)에 더하여 다른
요소들과도 부합되어 있음을 시사한다. 이런 말지각의 어려움은 인공와우를 통한 청각적 정보의 열약한 spectral 및 temporal resolution 등의 요소13)11)16)나 말소리 습득의 결정적 시기와 오랜 기간 동안의 청각박탈에 따른 청각적인 경험의 부재에서 오는 말소리 잉여자질의 제한된 활용능력10)으로
기인될 수 있다. 이러한 원인에 도전적이고 열약한 듣기 환경적 요소가 더하여지면 인공와우 착용인은 더욱 현저한 말

영어 초록

Although spectral information is reduced or degraded, most normal listeners easily recognize spoken language because of the spectral redundancy of speech information. Little is known about speech intelligibility in cochlear implant listeners when the spectral resolution of speech signal is significant limited or the fine spectral structures are not available. This study examined the ability to recognize filtered speech in normal and cochlear implant listeners. Two experiments were conducted. In Experiment 1, Korean CVC monosyllabic words spoken by a female speaker were low- and high-pass filtered and presented to 20 normal-hearing subjects. Word recognition performance was obtained at most comfortable level for four low-pass filtered conditions (800-, 1200-, 1500-, and 1700-Hz cutoffs) and for four high-pass filtered conditions (1700-, 2100-, 2500-, and 3000-Hz cutoffs). In Experiment 2, two CVC monosyllabic lists that showed 90-100% correct recognition at low- and high-pass filtered conditions in normal-hearing subjects were selected and presented to individuals that had post-lingual deafness. Word recognition scores were measured in unfiltered conditions and in lowand high-pass filtered conditions. Ten individuals that had post-lingual deafness and used a cochlear implant participated in this study.
Recognition performance was significantly poorer in CI listeners than in normal-hearing subjects. For the CI listeners, the overall percentage of correct recognition scores in unfiltered conditions was about 50%. In low-pass filtered conditions, recognition performance
deteriorated with decreasing filter cutoffs. In high-pass filtered conditions, performance was extremely poor even in the 1700-Hz cutoff condition. Reduced spectral information cause significant difficulties in speech recognition in normal-hearing subjects and further
worsened in CI listeners. This finding suggests that high degrees of spectral redundancy may not be available for cochlear implant users. CI users may equally have dependence on both low- and high-frequency hearing channels for speech recognition.

KEY WORDS：Cochlear implant·Filtering·Low-pass filter·High-pass filter.

참고 자료

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