Yu.S. Dzhos Ph.D. (Med.), Associate Professor, Deputy Director for Scientific Work, Institute of Medical and Biological Research Northern (Arctic) Federal University, Arkhangelsk. E-mail: u.jos@narfu.ru A.V. Gribanov Dr.Sc.(Med.), Professor, Honored Scientist of RF, Director, Institute of Medical and Biological Research Northern (Arctic) Federal University, Arkhangelsk. E-mail: a.gribanov@narfu.ru M.V. Vyucheyskaya Post-graduate Student, Junior Research Scientist of Laboratory Neurophysiology and Higher Nervous Activity, Institute of Medical and Biological Research Northern (Arctic) Federal University, Arkhangelsk. E-mail: mariavangel@mail.ru

In this paper show results of spectral analysis of brain activity in children of primary school age. Describe the changes of maximum amplitude, total power, the dominant frequency, power and asymmetry index of basic rhythms of electroencephalogram (EEG) in children 7-10 years in age aspect. It was found that with increasing age of the children between 7 and 9 years, changes in the spectral characteristics of EEG characterized by a decrease in the maximum amplitude and the full power of low-frequency theta- and delta- rhythms, increase in these para-meters among beta1- alpha- and beta2-rhythms. At the age of 10, the restructuring of the bioelectrical activity of the brain is through a slight increase in power delta- and theta- rhythms, increasing the frequency of the dominant alpha-rhythm in the parietal and occipital areas of the left hemisphere. For children of all ages study characteristic changes in the structure of the index rhythms, exhibiting increased capacity index alpha-rhythm. Among children 7 years capacity index alpha rhythm increased only in the occipital areas of both hemispheres, whereas in children 8-10 years it has increased in the occipital and parietal regions in the right and left hemispheres. The manifestations of asymmetry is characterized by increased capacity beta1- and beta2-rhythms in 7 years and the power of the delta- and alpha-rhythm in 10 years by the right hemisphere, as well as increased power fluctuations beta1-rhythm in the left hemisphere among children of 8 years old. It is reveals that the age differences of EEG spectral components are a reflection of morphological and functional changes of the central nervous system and can be markers of mental development of children.

 

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