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Improved amplitude evaluation of the frequency following response (FFR)
H Dembon1, J Hohnsbein, L Blanke
1Institut für Arbeitsphysiologie, Abt. Sinnes-und Neurophysiologie, Dortmund, F.R.G.
Electroencephalography and Clinical Neurophysiology
|January 1, 1989
Abstract:
Three methods were combined to improve the evaluation of the amplitude of the frequency following response (FFR) in unfavorable signal-to-noise conditions. The first step was the application of a time-multiplex averager to reduce noise variance between amplitude values to be compared. The second step was the evaluation of amplitude in the frequency domain by means of a digital triangle filter. The third step was the correction of raw FFR amplitudes by an algorithm that takes into account several noise values.