Аннотация:A new methodological approach to the assessment of EEG synchronicity is considered, based on the analysis of correlations between amplitude-modulation processes (EEG envelopes). The effectiveness of this approach is demonstrated for identifying topographic patterns; for analysis by frequency ranges; for assessing the stability and dynamics of changes in the functional state; for identifying heterogeneous subgroups of subjects and outliers; for identifying individual and group differences, differences in the synchronization of the same-name pairs of leads and asymmetry; for classification separation of EEG records of the norm and deviations of the schizophrenic type with reliability approaching 100%.