[The genetic traits of the spatial organization of the electrical activity of the human cerebral cortex].

Within-pair similarity of topographic maps of the cortical electrical activity was studied in 11 monozygotic pairs of twins (MZ) and 20 genetically unrelated persons (UP) during rest and solving four mental tasks. During rest similarity of topographic maps higher in MZ in comparison with UP. We showed that no specific frequency band influenced formation of high similarity between MZ maps. The maximal similarity between MZ maps was seen in the anterior zones of the left hemisphere and in parieto-temporal areas of the right hemisphere. Differences between MZ and UP maps were revealed both in the anterior areas of the left hemisphere and parieto-temporal areas of the right hemisphere, but they were most pronounced in the right hemisphere. The data obtained lead to the conclusion that genetic factor influences not only the separate EEG components, but the system organization of the cortical processes. This was confirmed by the results of topographic similarity analysis carried out for various tasks, i.e. similarity coefficients attained the level of significance only for the right-hemispheric tasks (simultaneous analysis of non-verbal material).