| 정상과 고심도 감각신경성난청에서 청성지속반응(Auditory
Steady-State Response)에 영향을 주는 변수에 관한 고찰 |
| 조수진1, 이정학2, 김형종2, 조소현1, 임덕환3, 김진숙3 |
1대불대학교 언어치료청각학과
2한림대학교 의과대학 이비인후과
3한림대학교 자연과학대학 언어청각학부 |
| A Study of Factors Affecting Auditory Steady-State Response in Normal and
Severe to Profound Sensory-Neural Hearing Loss |
| Soo-Jin Cho1, Jung-Hak Lee2, Hyung-Jong Kim2, So-Hyun Cho1, Dukhwan Lim3, Jin-Sook Kim3 |
1Division of Speech Pathology and Audiology, Daebul University, Yeongam, Jeonnam, Korea
2Department of Otolaryngology, Hallym University School of Medicine Hallym University, Anyang, Korea
3Division of Speech Pathology and Audiology, College of Natural Science, Hallym University, Chuncheon, Korea |
| Correspondence |
Soo-Jin Cho ,Tel: (061) 469-1482, Fax: (061) 469-1317, Email: sj2434@daebul.ac.kr
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Received: November 9, 2005; Accepted: December 2, 2005. Published online: December 31, 2005. |
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| ABSTRACT |
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The purpose of this study was to find out effects of factors related with stimuli on ASSR in normal hearing and sensory-neural hearing
loss (SNHL). We compared the ASSR amplitudes, the time required to detect significant responses, ASSR thresholds and differences
between ASSR and pure tone thresholds for each exponent of modulation and stimulus level. Subjects included 35 persons
(68 ears) with normal hearing and 24 persons (44 ears) with SNHL. A clinical AC 33 audiometer (Interacoustics) was used to
evaluate pure tone thresholds. ASSR was obtained using MASTER system (version, 2.01) at carrier frequencies of 500, 1,000, 2,000,
4,000 Hz with modulation frequencies of 82-99 Hz and the exponent of modulation (N) 1 or 2 (100% AM/20% FM vs 100%
AM2/20% FM). Results were as follows. Firstly, ASSR amplitudes with AM2/FM was significantly larger than those with AM/FM
by 9.66 % and 3.32 % at each stimulus level (50 dBHL vs 30 dBHL) in normal hearing and by 12.54 % at 10SL in SNHL. Secondly,
the time required to detect significant responses was not significantly different for each exponent of modulation and stimulus level in
both normal hearing and SNHL. Thirdly, ASSR thresholds and differences between ASSR and pure tone thresholds with AM2/FM is
significantly lower and smaller than those with AM/FM in both normal hearing and SNHL. The results indicate that ASSR with the
exponent of modulation from 1 to 2 may produce larger amplitudes and take the short time to obtain significant responses and may
produce lower thresholds andsmallerdifferences between ASSR and pure tone thresholds. Therefore the exponent of 2 for amplitude
modulation of mixed modulation can be used for estimating hearing level in both normal hearing and SNHL. |
| Key Words:
Auditory steady-state response (ASSR)·The exponent of modulation. |
| 중심단어:
ASSR· 변조· 감각신경성 난청. |
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