Differences between psychoacoustic and frequency following response measures of distortion tone level and masking

The Journal of the Acoustical Society of America
Hedwig E GockelRobert P Carlyon

Abstract

The scalp-recorded frequency following response (FFR) in humans was measured for a 244-Hz pure tone at a range of input levels and for complex tones containing harmonics 2-4 of a 300-Hz fundamental, but shifted by ±56 Hz. The effective magnitude of the cubic difference tone (CDT) and the quadratic difference tone (QDT, at F(2)-F(1)) in the FFR for the complex was estimated by comparing the magnitude spectrum of the FFR at the distortion product (DP) frequency with that for the pure tone. The effective DP levels in the FFR were higher than those commonly estimated in psychophysical experiments, indicating contributions to the DP in the FFR in addition to the audible propagated component. A low-frequency narrowband noise masker reduced the magnitude of FFR responses to the CDT but also to primary components over a wide range of frequencies. The results indicate that audible DPs may contribute very little to the DPs observed in the FFR and that using a narrowband noise for the purpose of masking audible DPs can have undesired effects on the FFR over a wide frequency range. The results are consistent with the notion that broadly tuned mechanisms central to the auditory nerve strongly influence the FFR.

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Citations

Jul 15, 2015·Journal of the Association for Research in Otolaryngology : JARO·Hedwig E GockelRobert P Carlyon
Aug 14, 2013·Hearing Research·Christopher J PlackDeborah A Hall
Feb 1, 2015·Hearing Research·Oliver Bones, Christopher J Plack

Related Concepts

Acoustic Stimulation
Audiometry, Bekesy
Cochlear Nerve
Electroencephalogram
Noise Pollution
Perceptual Distortions
Perceptual Masking
Pitch Perception
Psychoacoustics
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