Evoked potential analysis: on-line signal optimization using a mini-computer

Electroencephalography and Clinical Neurophysiology
J W Hartwell, C W Erwin

Abstract

An automated computer-based system is described for the analysis of evoked potentials. All procedures are carried out in real-time A small computer performs the following functions; timing of random stimulus presentation, rejection of artifact contaminated responses, collection of digital data, computation of averaged evoked responses, computation of the Wiener filter, storage of the filtered and unfiltered averages and display of the resultant averages. The Wiener filter as described by Walter (1969) and Doyle (1975) is used to improve the estimate of the evoked potential by discriminating against frequencies likely to be contaminated with noise. The defining equation for the Wiener filter states that information at any frequency is to be weighted by the ratio of the power known to be in the signal (response) at that frequency over the corresponding power known to be in both the signal (response) and the noise (background EEG) at the same frequency. The technique requires the computation of the Fourier transform for each response in order to produce the power spectra necessary for the Wiener filter. Earlier reports dealing with this technique have usee large computers to analyze the evoked potential data off-line. The system d...Continue Reading

References

May 1, 1975·Electroencephalography and Clinical Neurophysiology·D J Doyle
Sep 1, 1969·Electroencephalography and Clinical Neurophysiology·K A Kooi, A G Clague
Jul 10, 1964·Science·M HAIDERD B LINDSLEY

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Citations

Mar 1, 1979·Computer Programs in Biomedicine·E Carlton, S Katz
Nov 1, 1977·Electroencephalography and Clinical Neurophysiology·D J Doyle
Apr 1, 1979·Electroencephalography and Clinical Neurophysiology·R E Kearney
Jul 1, 1981·Electroencephalography and Clinical Neurophysiology·D SimpsonM Linnoila
May 1, 1990·Electroencephalography and Clinical Neurophysiology·R A Dobie, M J Wilson
Dec 1, 1981·Biological Psychology·J C WoestenburgJ L Slangen
Feb 1, 1987·Biological Psychology·P C Molenaar, J W Roelofs
Apr 1, 1980·IEEE Transactions on Bio-medical Engineering·E H Carlton, S Katz
Mar 1, 1981·IEEE Transactions on Bio-medical Engineering·J P de Weerd
Jan 1, 1981·Alcoholism, Clinical and Experimental Research·C W Erwin, M Linnoila

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