[Population genetics study of the functional asymmetry of the brain in native and migrant population of the north-eastern USSR].

It is shown that ethnic groups of the North-East of the USSR (eskimos, coast and reindeer chukchi, koryaks and evens) differ significantly in phenotype frequencies of hemisphere interrelations, and the extent of differences conforms to non-similarity of the cultural and economic structure of these populations. Significant phenotype frequency dynamics observed in new-coming population, depending on the duration of dwelling under the North conditions, makes the phenotype of "long-livers" of the North more distant from the population of middle latitudes and closer to the aboriginal populations. Such a dynamics of phenotypic structure of new-coming populations is due to selective migration of the population.

[Electrophysiologic characteristics of functional interhemispheric asymmetry].

Change of biopotentials spatial synchronization under functional loads addressed predominantly to one or the other hemisphere (correlative analysis of the first EEG derivative of more than two thousands healthy subjects of various age), allowed to single out three phenotypes of hemispheric relations differing mainly by different types of information processing: right-hemispheric, left-hemispheric or mixed. Expressed EEG activation in both hemispheres (judged by alpha-index change) is manifest when the subject is presented with a task, the context of which does not correspond to the initially dominating type: in right-hemispheric--at solution of tasks, oriented to logical-verbal context and in left-hemispheric--to spatial-image one. The high level of non-specific EEG activation may be considered as an attempt of compensation of relative functional insufficiency of the right hemisphere systems in initially left-hemispheric or left-hemisphere systems in right-hemispheric individuals.

[Population genetics study of functional brain asymmetry in the native and immigrant populations of northeastern USSR. I. Sex-age distribution and familial data].

Clearly definable polymorphism of hemisphere interrelations represented by three phenotypes was established by the method of EEG cross-correlation analysis. Each phenotype of the three, representing polymorphism, is characterized by marked specificity of perception and the processing of information, which determines certain integral physiological characteristics of individuals. Phenotype frequencies in aboriginal and new-come populations of the North-East of the USSR differ significantly.

[Psychopathologic conditions from the standpoint of the functional specialization of the cerebral hemispheres].

A comprehensive examination of the nature of psychopathological syndromes and the functional involvement of the structures of the right or left hemispheres (assessed by the degree of spatial synchronization of the biopotentials) revealed a relationship between the features of the syndrome formation and the predominant utilization of the mechanisms of perception and procession of information common to the left (in syndromes determined by interpretative formations) or the right (in hallucinational syndromes) hemisphere. The predominant involvement of the systems of one or another hemisphere may determine some characteristics of the clinical picture of mental diseases detected in transcultural studies.