AUDIOLOGY JAPAN
Online ISSN : 1883-7301
Print ISSN : 0303-8106
ISSN-L : 0303-8106
Sensitivity of Detection Method for Amplitude-Modulation Following Response
Masaru AoyagiTeruo KirenYoshinori KimYutaka SuzukiTakeo FuseYoshio Koike
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Keywords: FFT
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1992 Volume 35 Issue 6 Pages 652-658

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Abstract

The sensitivity of the following 3 methods for detecting amplitude-modulation following response (AMFR) was evaluated: (1) visual analysis of waveform cofiguration, (2) phase spectral analysis and (3) spectral amplitude analysis (response determination by S/N ratio calculated from spectral amplitudes). AMFR was examined in 10 adults with normal hearing while wake and during sleep, and in 10 young children with normal hearing during sleep. The stimulus was a 1000Hz, 50dBnHL sinusoidally amplitude-modulated tone with a modulation depth of 95%. The modulation frequency was varied from 20 to 200Hz in 20Hz steps. Response was determined by each of the 3 methods and the results were compared.
Phase spectral and spectral amplitude analyses were far more sensitive than visual analysis. The results of phase spectral analysis were correlated to those of spectral amplitude analysis, but the detectability of phase spectral analysis was slightly better than spectral amplitude analysis. These results suggest that the combined application of phase spectral and spectral amplitude analyses was proved as useful for detecting response in AMFR with greater sensitivity.

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© Japan Audiological Society
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