주파수 미세구조(frequency fine structure)에서 대측 억제 전후의 변조이음향방사 측정

서지정보

ㆍ발행기관 : 한국청각언어재활학회 ㆍ수록지정보 : 청능재활 / 8권 / 2호
ㆍ저자명 : 김지연, 심현용, 김진숙, 남의철

목차

INTRODUCTION
MATERIALS AND METHODS
RESULTS
DISCUSSIONS AND CONCLUSIONS

영어 초록

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.

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