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Korean Journal of Otorhinolaryngology-Head and Neck Surgery > Volume 37(6); 1994 > Article
Korean Journal of Otorhinolaryngology-Head and Neck Surgery 1994;37(6): 1129-34.
Contralateral Stimulation and Olivocochlear Bundle Efferent Effects on Click-Evoked Otoacoustic Emission in Human
Sun O Chang, MD, Ha-Won Jung, MD, Jong Woo Chung, MD, and Hong Ryul Jin, MD
Department of Otolaryngology, Seoul National University College of Medicine, Seoul, Korea
정상인에서 클릭 유발 이음향방사를 이용하여 원심성 청성신경 전달로인 올리브 와우각속의 탐색
장선오 · 정하원 · 정종우 · 진홍률
서울대학교 의과대학 이비인후과학교실
ABSTRACT

It has been shown that contralateral auditory stimulation(CAS) along medial efferent system pathways may alter cochlear micromechanics and hence affect click evoked otoacoustic emission (CEOE) in humans. CAS reduced CEOE in humans, but several parameters alter this effect ; middle ear pathology, idiosyncracy, sleep, intensity of the sound level evoking the CEOEs, type of the CAS, etc. However it is the only non-invasive way to explore the medial olivocochlear system in humans. For the exploration, pure tones were presented to the contralateral ears of 30 normal hearing ears during the acquisition of CEOE using a Kemp ILO88 Otodynamic Analyser. The contralateral ear was stimulated with pure tones of 250, 500, 1,000, 2,000 and 4,000Hz at 20, 40, 60 and 80dB sound pressure level(SPL), respectively. Echo response and reproducibility showed contralateral suppression in a manner directly related to the intensity of CAS(p=0.0062, p=0.0000) in all frequencies. However, they were not related to the frequency of CAS(p=0.4633, p=0.7831). Excluding the data of contralateral stimulation with 80dB SPL, echo response and reproducibility were also related to the intensity(p=0.0234, p=0.0000), but not to the frequency of CAS(p=0.4123, p=0.7506). 

Keywords: Contralateral auditory stimulationClick evoked otoacoustic emissionMedial olivocochlear system.
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