Photoperiodism and changes in brain bioelectric activity in schoolchildren in the arctic zone

The dynamics of the main electroencephalographic patterns and their relationship with natural illumination periods have been described in this study. We have determined periods, which are the most favorable for brain functioning and development of cognitive function in northerner schoolchildren. We have found that adaptive changes in bioelectric activity of the brain take place during transitional seasons. An increase in the activity of all EEG rhythms in spring and predominance of the slow-wave Δ and θ activity in autumn have been found. The discovered dynamics of amplitude and spectral parameters of EEG are not dependent on age-related changes. The formation of bioelectric activity of the brain in northerner schoolchildren was mostly affected by the sex of a child and changes in the daytime duration. © 2016, Pleiades Publishing, Inc.