In this paper, we have used a method for EEG synchrony estimation (an analysis of correlation synchrony of EEG. EEG recording was performed in a group of children and adolescents, aged 8-15 years, normal group (n=40) and schizophrenic group (n=30). One of the basic features of the integrated EEG picture is the presence of a pathology of extended zones of sharply lowered EEG-synchrony dividing the local and isolated areas in frontal and occipital regions, mainly of normal or sometimes raised synchrony. Also, there were significant correlations of synchrony estimates with memory and attention. The results obtained are in line with the theory of disintegration of cortical electrical activity in schizophrenia spectrum disorders. It is important that the used method provides the high reliability (up to 100%) of the differentiation between normalcy and a pathology.