TOPOLOGICAL MAPPING OF SYNCHRONIZATION OF THE TRANSITIONAL PERIODS INHUMAN MULTICHANNEL EEG

Techniques of evaluation were studied of the EEG synchronization betwe en different EEG derivations in humans. It was shown that the pattern of cortical cooperativity constructed on the basis of classical EEG cr osscorrelation and coherence could be substantially supplemented with estimations of coincidences of the moments of sharp changes (MSG) in m ultichannel EEG recording (the so called ''operational synchronization ''). The multichannel EEG was recorded in humans during memory task pe rformance. A non-parametric technique was developed on the basis of th e family of Kolmogorov - Smirnov's statistics for revealing the MSC in separate EEG realizations and subsequent spatial-temporal mapping of the MSC coincidences in different derivations of the multichannel EEG. It was shown that such maps markedly change depending on the current cognitive activity of the subjects. An attempt was made to interpret t he estimations of the frequency and operational synchronization of mul tichannel human EEG.