Interindividual Similarity of the Spatial Organization of the EEG: an Ontogenetic Study

In this study took part 39 adult subjects, 28 children 12 years old, 21 children 8–9 years old, 26 children 5–6 years old and 19 newborns. In each age group, the coefficient of interindividual similarity (CIS) of the spatial organisation of the electroencephalogram (EEG) was calculated using Pearson's crosscorrelation algorithm. Results reveal high level of interindividual similarity of spatial structure of EEG distant connections. Both in adults and children CIS exceeded 0.80. In women, compared with men, a significantly higher level of interindividual similarity of the spatial organization of the EEG was revealed for all studied combinations of EEG connections. The obtained data shows that relative stability in ontogenesis of the spatial structure of dynamic activity of the cortex is apparently provided mainly through determined by a genotype distant intra- and interhemispheric interconnections that forming certain morfofunctional “skeleton” of neocortex. The functionally specific interactions realizable across more plastic “local chains” of near intercortical interrelations are carried out on basis of the dynamic activity of the brain hemispheres that ordered by means of such “global” interactions. Such system organization of intercortical interactions can provide both safety of individual properties of personality and the ability of the brain to effectively adapt to various influences of environment at phenotype formation in ontogenesis.