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Journal of Speech and Hearing Research Vol.35 157-166 February 1992.
© American Speech-Language-Hearing Association
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Auditory Distortion Products Measured With Averaged Auditory Evoked Potentials

Mark E. Chertoff 1
Kurt E. Hecox 2

Robert Goldstein 1
1 University of Wisconsin, Madison
2 University of Wisconsin, Madison and Nicolet Instrument Corp. Madison, WI

The purpose of this investigation was to describe the properties of averaged auditory evoked potential distortion products (AEP-DPs) in guinea pigs. This study provided a step toward developing a clinical index of nonlinear processing of auditory signals and supplied a baseline for studies evaluating the effect of cochlear damage on AEP-DPs.

The amplitude of the AEP-DPs was evaluated as a function of f2/fl ratio (1.12–1.52) and primary frequency (500 Hz–2000 Hz). The amplitude of the AEP cubic difference tone (AEP-CDT) increased with increasing f2/fl ratio for the 500-Hz f1 primary and remained constant for the 800-Hz and 1700-Hz f1 primaries. The AEP-CDT generated by the 1100-Hz and 1400 Hz f1 primaries was maximum for the middle f2/fl ratios (1.22, 1.32, and 1.42). The AEP-CDT could not be distinguished from the noise floor for the 2000-Hz f1 primary. The AEP difference tone (AEP-DT) was larger and more frequently identified than the AEP-CDT. The amplitude of the AEP-DT decreased with an increase in f2/f1 ratio. The decrease was more pronounced for low-frequency f1 primaries than for high-frequency f1 primaries.

KEY WORDS: auditory nonlinearity, auditory distortion products, auditory evoked potentials, cubic difference tone, difference tone

Submitted on December 21, 1990
Accepted on April 12, 1991


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