신호대잡음비가 인공와우착용자의 GDT에 미치는 영향 |
한수희1, 구성민2, 하은정1, 신정은1, 박홍주1, 임덕환3 |
1건국대학교 의과대학 이비인후과학교실 2한림대학교 대학원 청각학과 3한림대학교 언어청각학부 청각학과, 청각언어연구소 |
Effects SNR Levels on Gap Detection Thresholds of Cochlear Implantees |
Soohee Han1, Sungmin Koo2, Eunjung Ha1, Jungeun Shin1, Hongju Park1, Dukhwan Lim3 |
1Department of Otolaryngology, College of Medicine, Kunguk University, Seoul, Korea 2Section of Audiology, Graduate School, Hallym University, Chuncheon, Korea 3Section of Audiology, Audiology & Speech Pathology Research Institute, Hallym University, Chuncheon, Korea |
Correspondence |
Soohee Han ,Tel: (02) 2030-5290, Fax: (02) 2030-5009, Email: suddori@hanmail.net
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Received: July 15, 2007; Accepted: October 3, 2007. Published online: December 31, 2007. |
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ABSTRACT |
Cochlear implantees often showed some degrees of difficulty in speech discrimination. In this task, fine temporal resolution or structure
of the speech might be an important parameter for the correct discrimination. This temporal resolution could be measured using
gap detection threshold. In this study, within-channel gap detection thresholds of cochlear implantees were analyzed under ipsilateral
background noise conditions with various signal-to-noise ratios. Four adult cochlear implantees were examined for gap detection
thresholds under quiet, +10, +5, 0, -5, -10 dB SNR conditions. These data were compared with those of normal adults (n=10)
and elders (n=10) to assess the temporal ability of cochlear implantees under background noise conditions. In these results, cochlear
implant group showed longest gap detection thresholds under quiet condition (mean 13.4 msec) while normal and elder groups exhibited
3.3 msec and 6.2 msec of mean values. Gap detection thresholds of cochlear implantees were deteriorated even more under
ipsilateral noise conditions and demonstrated worse performances than the other two groups. In conclusion, cochlear impantees showed
more difficulties in temporal performances than normal adults or elders did. Improvement in performances on temporal domain
has been one of the critical issues for better speech perception in cochlear implantees. These data from gap detection performances
under various noise conditions may be used as effective indications of assessing the rehabilitation in cochlear implantation. |
Key Words:
GDT·Cochlear implant·SNR. |
중심단어:
GDT· 인공와우· 신호대잡음비. |
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