Z. V. Galasheva - Post-graduate Student, Biorhythmology Laboratory, FGBUN of Institute of Physiology of Natural Adaptations of the Ural Office of the Russian Academy of Sciences (IFPA OURO RAS), Arkhangelsk, Russia
L. V. Poskotinovа - Dr. Sc. (Biol.), Associate Professor, Head of the Biorhythmology Laboratory, IFPA Ouro RAHN
D. B. Dyomin - Ph.D. (Biol.), Senior Research Scientist, Biorhythmology Laboratory, IFPA OURO RAS E. V. Krivonogova - Ph.D. (Biol.), Senior Research Scientist, e Biorhythmology Laboratory, IFPA OURO Russian Academy of Sciences. E-mail: zinaida-galasheva@rambler.ru

The spatial organization of bioelectric activity of a brain reflects the balance of activating and brake influences of the stem, subcortical and cortical structures forming a neural networks. Also the existence of various types can be caused by various rates of age formation of regulatory systems at teenagers, and it influences on the extreme climate - geographical conditions of their accommodation. Research objective - the definition of types of the organization of bioelectric activity of a brain at teenagers of 1517 years living in the Polar Area of (Nenets Autonomous Area) and the Subpolar area Arkhangelsk). 159 almost healthy teenagers of 1517 years are surveyed. From them in the Polar area 41 girls and 33 young men, and in the Subpolar area  60 girls and 25 young men. Research conducted by means of the Entsefalan 131-03 electroencephalograph (the Physician of MTD, Russia) at the scheme of 16 standard assignments with a reference ear electrode. The program of research included a background record blindly, test with opening-closing of eyes, rhythmic photostimulation of different frequency (422 Hz), hyperventilation (3 min). E.A. Zhirmunskaya and V.S. Losev's classification is taken as a basis of allocation of types of the EEG organization. Type I - the organized, modulated alpha activity with a maximum amplitude from 50 to 100 MKV, with a frequency from 8 to 13 Hz with accurate zone distinctions and the expressed reaction of activation. Type II  a hyper synchronous rhythm of alpha or beta range with violation of clearness of zone distinctions with the maximum amplitude over 100 MKV and an index a theta-activities more than 30%. Type III  desinchronny, with alpha activity easing (an index lower than 50% and with a maximum amplitude up to 50 MKV) and activation reactions. Type IV - the disorganized and unmodulated alpha-activity with smoothed zone distinctions. Results showed that at 47% of persons (35 people), living in the Polar area, the I type of the EEG organization is revealed. Among girls this type is met at 16 people (39%), and among young men - at 19 people (57,6%). With the IV EEG type 25 people (34%) are revealed; from them 18 girls (44%) and 7 young men (9%). With the III EEG type 14 people (19%) are defined. Among girls this type is met at 7 (17%) and among young men ? at 7 (21,2%). At living in the Subpolar area the I type of the EEG organization is revealed at 46% of persons (39 people). Among girls - at 22 (36,7%) and among young men - at 17 (68%). The IV EEG type is defined at 21 girls (35%) and 3 young men (12%). With the III type 22 people (26%) are defined; among girls - at 17 (28,3%) and among young men - at 5 (20%). Persons with the II type in surveyed areas weren't revealed. Thus, the disorganized EEG type more is expressed at girls of the Polar area that can testify to hyperactivity of sub crustal structures of a brain at female persons in these climatic conditions. The EEG Desinchronny type is presented more at the girls living in the Subpolar area that can reflect expressiveness of ascending activating influences the retikulyarnykh of structures on a cerebral cortex at girls of this region probably caused by high information loadings.