Characteristics of the spatial organization of oscillations of brain bioelectric potentials in adolescents

Abstract

Adolescence is characterized by an intense formation of interregional interaction of cortical areas. In this period, the activity of deep brain structures is significantly reorganizing and cortical-subcortical inter action is augmenting. Our objective was to assess the pattern of changes in the spatial structure of brain bio electric potentials with age and characteristics of these structures in adolescents. For this purpose, studies of EEG were conducted in 230 subjects of both sexes aged 4 to 35 years. We quantified the interconsistent changes in correlations of oscillations of bioelectric potentials in 20 lead EEG, using the integrated index VOL. Age related changes in the consistency of EEG correlations were analyzed both in the background state and during verbal activity (comprehension of texts in Russian and in English). Cognitive tasks were performed by subjects older than 8 years. It was discovered that spatial synchronization of EEG processes both in the background state and during cognitive tasks increased with age, but, after 20 years, the rate of changes decreases significantly. In adolescence (12-17 years), sex differences appear in the correlation of EEG pro cesses between the left and right hemispheres in subjects performing verbal tasks. We observed saltatory changes in VOL indices in 12 to 14 year old boys, whereas in girls of the same age, reorganization of systemic brain activity goes more gradually 1.5-2 years in advance.Keywords: age related changes in correlation of oscillations of cortical bioelectric potentials, sex differences in formation of systemic brain activity, adolescence specificity

Ontogenetic Development of Neurophysiological Mechanisms Underlying Language Processing

“…The other series of our studies [48,49] addresses the role of multiple factors that determine the individual variety of neurophysiological mechanisms providing learning and using two languages. Speech formation is influenced by both common factors of bilingual and monolingual and bilingual special factors.…”