Pure-tone Threshold Prediction by 80-Hz Amplitude-modulation Following Response

Masaru Aoyagi Department of Otolaryngology, Yamagata University School of Medicine, Yamagata, 990-23, Japan

Teruo Kiren Department of Otolaryngology, Yamagata University School of Medicine, Yamagata, 990-23, Japan

Hidekazu Furuse Department of Otolaryngology, Yamagata University School of Medicine, Yamagata, 990-23, Japan

Takeo Fuse Department of Otolaryngology, Yamagata University School of Medicine, Yamagata, 990-23, Japan

Yutaka Suzuki Department of Otolaryngology, Yamagata University School of Medicine, Yamagata, 990-23, Japan

Masashi Yokota Department of Otolaryngology, Yamagata University School of Medicine, Yamagata, 990-23, Japan

Yoshio Koike Department of Otolaryngology, Yamagata University School of Medicine, Yamagata, 990-23, Japan

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Abstract

The usefulness of 80-Hz amplitude-modulation following response (AMFR) detected by phase spectral analysis to predict the hearing threshold during sleep was evaluated in 20 normal adults, 8 normal children and 37 children with hearing impairment. The onset effect of tonal stimulus on 80-Hz steady state response was studied in normal adults during sleep and a threshold of 80-Hz AMFR detected by phase spectral analysis was compared with that of ABR elicited by tone pips in children during sleep. Although 80-Hz AMFR is not appropriate for the assessment of hearing in adults, it appears useful for evaluating hearing in young children during sleep. Hearing prediction by 80-Hz AMFR appears to be more accurate than that by ABR elicited with tone pips. The onset effect of stimulus on 80-Hz AMFR with modulation depth of 95% was less than 80-Hz SSR evoked by clicks.

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Pure-tone Threshold Prediction by 80-Hz Amplitude-modulation Following Response

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Pure-tone Threshold Prediction by 80-Hz Amplitude-modulation Following Response

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