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Audiol > Volume 8(2); 2012 > Article
Audiology 2012;8(2): 165-176.
Published online: December 31, 2012.
doi: http://dx.doi.org/10.21848/audiol.2012.8.2.165
주파수 미세구조(frequency fine structure)에서 대측 억제 전후의 변조이음향방사 측정
김지연1, 심현용1, 김진숙2, 남의철3
1한림대학교 일반대학원 언어청각학과
2한림대학교 자연과학대학 언어청각학부
3강원대학교 의학전문대학원 이비인후과학교실
DPOAE Measurements at Frequency Fine Structure Before and After Contralateral Suppression
Ji-Yeon Kim1, Hyun-Yong Shim1, Jin-Sook Kim2, Eui-Cheol Nam3
1Department of Speech Pathology and Audiology, Hallym University Graduate School, Chuncheon, Korea
2Department of Speech Pathology & Audiology, College of Natural Sciences, Hallym University, Chuncheon, Korea
3Department of Otolaryngology, Kangwon National University, School of Medicine, Chuncheon, Korea
Correspondence  Eui-Cheol Nam ,Tel: (033) 258-2311, Fax: (033) 255-8809, Email: birdynec@kangwon.ac.kr
Received: November 3, 2012; Revised: December 14, 2012   Accepted: December 17, 2012.  Published online: December 31, 2012.
ABSTRACT
The purpose of this study was to investigate distortion product otoacoustic emission (DPOAE) measurements before and after contralateral suppression at frequency fine structure. 8pts/octave DP-gram was measured at f2 frequencies ranging from 841 Hz to 8,000 Hz in fifty six ears of normal hearing adults with and without contralateral broad band noise (BBN) at 70 dB SPL. The data were analyzed depending on groups by gender, age(20's, 30's, and 40's+) and directions of the ear. Results showed the followings: (1) DPOAE amplitude was decreased significantly with presence of broad band noise, showing contralateral suppression. (2) At the frequency fine structure, change in DPOAE amplitude before and after suppression was significant. The great amplitude change was observed between 1,000 and 2,000 Hz for most participants. (3) Change in DPOAE amplitude before and after suppression was not significant depending on gender and age, but was significant depending on directions of the ear. (4) Change in DPOAE amplitude before and after suppression was significant for peak and dip frequencies. Also, change in DPOAE amplitude was mostly suppressed at the peak frequencies, however, change in DPOAE amplitude was varied at the dip frequencies. A larger inter-subject variability was observed in the dip frequencies. The results suggest that measuring DPOAE contralateral suppression at peak frequencies in DPOAE would improve efficiency of the auditory efferent system assessment.
Key Words: Otoacoustic emission, Contralateral suppression, Frequency fine structure
중심단어: 이음향방사· 대측 억제· 주파수 미세구조
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