Real-time filtering for the estimation of steady-state visual evoked brain potentials.
It is shown that EEG visual evoked potentials elicited by repetitive stimuli in the range of 2 to 20 per second can be readily estimated in real time using a simple filtering approach. This measurement takes advantage of the fact that a comb filter will pass the important Fourier harmonics of the signal to provide an estimate of the evoked activity, plus track time-variations in the signal. Results on human subjects demonstrate the effectiveness of the approach.
Collura
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Section of Epilepsy and Clinical Neurophysiology, Cleveland Clinic Foundation, OH 44195.
D004569:Electroencephalography / Q000379:methods*; D005074:Evoked Potentials, Visual; D005583:Fourier Analysis; D006801:Humans; D012016:Reference Values; D012815:Signal Processing, Computer-Assisted