A method to improve the latency estimation of the frequency-following potential (FFP).
If the latency of a noisy frequency-following potential (FFP) is estimated by determining the shift of the (periodical) cross-correlation function (CCF) between the stimulus and the FFP, the result may be unambiguous only within +/-1 or +/-2 periods of the CCF, because the absolute maximum and adjacent local maxima may not be significantly different. Here we present a method to amplify this difference by applying amplitude modulated stimuli. Using this method we first illustrate the effect of the method by a simulation and then demonstrate its usefulness by measuring real FFPs and estimating their latencies.
Hoormann
J
J
Institut für Arbeitsphysiologie an der Universität Dortmund, Germany.
Voss
B
B
Falkenstein
M
M
Hohnsbein
J
J
D016477:Artifacts; D004569:Electroencephalography / Q000379:methods*; D005072:Evoked Potentials, Auditory; D006801:Humans; D011930:Reaction Time