Rearrangements of the Algorithms of Interaction between Wave Components of EEGs in Subjects with Different Mechanisms of Brain Self-Regulation during Adaptation to High Altitudes

Abstract

Rearrangements of the temporal organization of the EEG pattern wave structure were studied in 68 subjects who stayed in the Pamir Mountains at an altitude of 3600 m above sea level for one month. The rearrangement of the EEG pattern proceeds through the following stages: (a) a drastic increase in the probability of interaction of α components accompanied by a decrease in wave interactions in the θ and Δ ranges during the first day of adaptation; (b) a decrease in the probability of interaction of α components accompanied by an increase in the probability of interaction with θ and Δ components on the seventh to ninth days; (c) an increase in the probability of interaction with α components in the occipital leads and a high probability of interaction of all EEG components with θ components in the temporal and frontal regions on the 14th to 16th days; (d) a second decrease in the probability of interaction with α components accompanied by an increase in the interactions with the θ- and Δ frequency ranges in subjects with medium or low plasticity (groups II and III, respectively) of neurodynamic processes and a normalization of interaction of α components in subjects with high plasticity (group I) on the 21st to 23rd days; and (e) completion of the adaptive rearrangement of the pattern of interactions between EEG components in group I and, partly, group II subjects and a decrease in the probability of interaction with the α components accompanied by an increase in interaction with θ components in group III subjects on the 28th to 30th days of adaptation. The results of the study indicate a higher adaptability to high-altitude hypoxia in subjects from groups I and II compared to those from group III. These factors should be taken into account when selecting specialists for work in the mountains.