Brain functions analyzing system “Cocolyzer”

A realistic head shape allows accurate estimates of dipole positions and moments in which the effect of the skull which has low electric conductivity as compared with other parts of the brain is taken into consideration. Possible errors in position are less than 3 mm except for the basal region of the skull. Signal processing for visual and auditory stimuli or for sensation in time and space in the brain cortex is traced with the aid of this method. On the other hand, various different mental states (comfortable, uncomfortable states, state of mental stress, solving intelligent tasks etc.) cause different features in EEG. The Cocolyser described has the following features: real-time display; EEG waveforms after filtering; real-time display of potential maps, power maps, and spectral array; estimation of positions and moments of one or two equivalent dipoles for EEG and evoked potentials; spectrum of period fluctuations of the alpha rhythm and other specified components; automatic discrimination of mental states; and filing of EEG