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This study reports two experiments conducted to assess the sensitivity of dyslexic listeners to amplitude modulation (AM) of acoustic stimuli. The smallest detectable depth of AM of white noise was measured as a function of modulation frequency. Dyslexic listeners had significantly higher thresholds of AM depth than did matched control listeners. We also recorded the scalp potential evoked by AM of white noise (the amplitude modulation following response, AMFR). Dyslexic listeners had significantly smaller AMFRs than did matched control listeners. The reduced AMFR is consistent with reduced sensitivity to AM, and there was a strong association between these psychophysical and physiological measures. This deficit in AM sensitivity may result in impaired perception of the AM present in speech.

Original publication

DOI

10.1044/jslhr.4204.797

Type

Journal article

Journal

J Speech Lang Hear Res

Publication Date

08/1999

Volume

42

Pages

797 - 803

Keywords

Adult, Auditory Threshold, Dyslexia, Evoked Potentials, Auditory, Female, Hearing, Humans, Male, Noise, Psychophysics, Speech, Time Factors