Tretiak T. Bioelectric activity of brain and variability of heart rate during productive cogni-tive activity.

It was shown that effective visual-figurative thinking corresponds to deeper depression of alpha-rhythm (especially in the central-parietal-occipital area), an increase of SP in beta2- and theta-ranges of EEG, multi-directional changes in SP of beta1-range (an increase in the frontal parts of the cortex and a decrease in the occipito-parietal parts); a decrease in the number of synchronizations in high-frequency alpha- and beta1-ranges, but an increase in the strength of relations in front sections, right-hemisphere coherence patterns in beta1-range. An increase in the number of significant relationships in the beta2-range, especially in the central and temporal areas of the right hemisphere, an increase in spatial complexity and in strength of coherent relations in the theta-band. Productivity of intuitive thinking is related to an increase of the spectral power of beta2-, delta-, theta-components of the EEG. Synchronization of the activity of the majority of frequency ranges is manifested in the front and motor zones of the cortex, which have close relations with the basal ganglia responsible for skills shaping. In the beta1-range, there are reliable inter-hemisphere long coherences between the front and rear departments of the right hemisphere, at the frequency of beta1,2- and theta-ranges of EEG are combined in large cell ensembles that cover central-parietal-temporal locuses of the cortex. Synchronization of biopotentials in the delta-range covers large areas of the cortex. The higher level of productivity of verbal-logical thinking corresponds to depression of the alpha-rhythm that is more evident in the left hemisphere and strengthening of the power of beta1,2-, theta-oscillations in the occipital areas of the cortex of both hemispheres and in the left temporal region; right-hemisphere coherence patterns in alpha- and delta-ranges; synchronization of the activity in the beta-frequency range and an increase in spatial complexity and strength of coherent links of beta1-oscillations are characteristic of the front zones of cortex. The number of coherent relations of beta2-, theta-ranges decreases at an increase in productivity of doing logic-related tests. It was found that at visual-figurative and intuitive thinking, low-productive students have a high level of central regulation of rhythm and highly productive students have a high level of autonomous regulation. Maintenance of verbal-logical operations is carried out by the high level of central regulation by the cardiac rhythm in the individuals of both groups, but with a more pronounced tension of regulatory systems of the organism for female students with less productivity. Correlation analysis revealed that productive mental activity of various types is caused by the specific integration of cortical-visceral processes: productive, intuitive and visual-figurative thinking are related to activation of the autonomous regulation of the HRV and the coherence in evolutionarily older delta- and delta-theta- systems of the brain; and productivity of verbal-logical thinking – with the activation of sympathetic section of the regulation of the cardiovascular system and synchronization in new alpha- and beta-oscillatory systems of the brain.