Abstract
Modulation detection interference is the decrease of sensitivity for amplitude modulation when the target is presented in the presence of modulating maskers [W. A. Yost and S. J. Sheft, J. Acoust. Soc. Am. 85(2), 848–857 (1989)]. A typical MDI experiment was carried out in which the maskers were located at 500 and 4000 Hz and the target at 1400 Hz (covering the range of speech frequencies). The modulation depths of the maskers were held steady at 0, 0.18, or 0.30. The modulation rates were 4, 8, or 16 Hz. Also, speech intelligibility was measured by a sentence test in continuous noise. Both experiments were carried out for six normal-hearing and six hearing-impaired subjects. All signals were presented at MCL level. Both groups of subjects were most sensitive for amplitude modulations when they were presented in the presence of the nonmodulating maskers or without any masker at all; the sensitivity decreased by 8 dB for normal-hearing subjects and 6 dB for hearing-impaired subjects for the modulated masker condition. The modulation threshold also increased for increasing reference modulation depths. The amplitude modulation discrimination sensitivity showed a significant correlation with the critical signal-to-noise ratios for speech intelligibility.
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