Frequency-following potentials in man by lock-in technique

Electroencephalography and Clinical Neurophysiology
M Euler, J Kiessling

Abstract

Frequency-following responses (FFR) from continuous tone stimulation were investigated by lock-in analysis. The technique is superior to conventional tone-burst stimulation, because it allows continuous registration of the response parameters with sweeping frequency. The scalp recorded FFR consists of at least two components separable from each other by their phase/frequency relationship. The microphonic component that dominates in ipsilateral records shows latencies of about 0.5 msec with negligible dispersion and must therefore originate in the basal cochlear turn. The neural component exhibits considerable dispersion, reflecting the travelling wave delay up to the region of best frequency. These long cochlear time delays are consistent with an apical FFR origin, and brain stem sources of the continuous tone response appear to be questionable. The present FFR analysis technique opens up a very direct and comprehensive way to assess the integrity of the entire inner ear for high frequency basal and low frequency apical cochlear regions as well.

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Citations

Jul 1, 1983·Electroencephalography and Clinical Neurophysiology·M Euler, J Kiessling
Jul 1, 1984·Hearing Research·I W Mair, E Laukli
Nov 6, 2007·Journal of Neuroscience Methods·Gernot R Müller-PutzGert Pfurtscheller
Mar 28, 2006·IEEE Transactions on Neural Systems and Rehabilitation Engineering : a Publication of the IEEE Engineering in Medicine and Biology Society·Gernot R Müller-PutzGert Pfurtscheller
Dec 1, 2005·Journal of Neural Engineering·Gernot R Müller-PutzGert Pfurtscheller

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