SEASONAL CHANGES IN THE EFFICIENCY OF BIOLOGICAL FEEDBACK SESSIONS ON THE ELECTRO-END CEPHALOGRAM
We studied the effectiveness of a tenfold course of biofeedback sessions on an electroencephalogram (EEG-BFB), aimed at increasing the power of the EEG signal in the alpha rhythm range and decreasing in the theta-wave range in different seasonal periods. The study involved 15 children 5-11 years old, which were characterized by difficulties with concentration, hyperactivity and emotional problems. EEG Mapping 3 was used as a work program. EEG potentials were diverted monopolarly from the Fp1, Fp2, F7, F8, F3, F4, T3, T4, C3, C4, T5, T6, P3, P3, P4, O1, and O2 loci in accordance with international system "10-20". Revealed the prevalence of efficiency in the summer. In accordance with the observed changes in the SPM alpha to the EEG theta rhythm recorded in different seasons, there is a pronounced tendency for the EEG - BOS efficiency to increase in the majority (87,5 %) of used leads in the period from spring to summer. The differences in the effectiveness of EEG-BFB in the temporal (T3) locus were statistically significant. The enhancement of the spectral characteristics of the high-frequency oscillations of the beta1 range is noted in the temporal (p<0,05), as well as in the frontal (p<0,05), central (p<0,05) and parietal (p<0,02) regions of the brain during the period of increased daylight hours. During the summer to autumn change in more than half of the leads (56,3 %), there was also a trend towards an increase in the efficiency of the EEG-BFB, which did not show any statistically significant differences in any of the leads. The most significant were the changes in the EEG-BFB efficiency observed in the EEG records in winter. In most leads (81,3 %), a significant decrease in the EEG-BFB efficiency was observed. Differences in frontal (F3) and temporal (T3) leads were statistically significant. An exception was the statistically significant increase in the EEG-BFB efficiency observed in the lead in Fp2 in winter compared with the summer period. The study showed that the effectiveness of EEG-BFB sessions aimed at increasing the power of the EEG signal in the alpha-rhythm range and decrease in the theta-wave range depends on the length of the daylight hours. The effectiveness of EEG-BFB sessions has a pronounced tendency to increase during the period from spring to summer and the downward trend observed from summer to winter. It is recommended to take into account the factor of the length of daylight for predicting the effectiveness of the correction of the psycho-emotional state of children by the method of feedback on the EEG characteristics.