A novel approach to single trial visually evoked potentials (VEP) variability analysis based on a new model of post-stimulus brain electrical activity is presented. The convolution model introduced by the author is experimentally verified by the analysis of flash stimulus effects on EEG amplitude and phase spectra. Pattern recognition in the signal phase domain is proposed for detection of any ...

The term visually evoked potential (VEP) refer to electrical potentials, initiated by brief visual stimuli, which are recorded from the scalp overlying visual cortex, VEP waveforms are extracted from the electro-encephalogram (EEG) by signal averaging. VEPs are used primarily to measure the functional integrity of the visual pathways from retina via the optic nerves to the visual cortex of the ...

Pattern reversal evoked potentials (PREPs) were studied in school going children 4-15 years of age (mean 9.9 +/- 2.6 yrs), using Ag/AgCl electrodes anchored on 01-A1 and 02-A2 scalp sites. Two sets of 256 pattern reversal stimuli with check sizes 32' and alternation rate 1 Hz were applied to each eye and evoked responses thus obtained were averaged and analysed by the inbuilt computer of the ev...