Journal of Speech, Language, and Hearing Research Vol.42 797-803 August 1999.
© American Speech-Language-Hearing Association
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Psychophysical Sensitivity and Physiological Response to Amplitude Modulation in Adult Dyslexic Listeners

Peter Menell 1
Ken I. McAnally 1

John F. Stein 1
1 University Laboratory of Physiology Oxford, UK

ken.mcanally{at}dsto.defence.gov.au

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.

KEY WORDS: dyslexia, amplitude modulation, hearing, evoked potential

Submitted on March 26, 1998
Accepted on February 8, 1999


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