Siberian Journal of Life Sciences and Agriculture (Dec 2020)
INFLUENCE OF EXAMINATION STRESS ON EEG AMPLITUDE IN THE CEREBRAL SPHERE OF THE BRAIN OF STUDENTS OF THE FACULTY OF BIOLOGY-CHEMISTRY WITH DIFFERENT INDIVIDUAL TYPOLOGICAL FEATURES
Abstract
During emotional stress, the main indicator of the functional state of the central nervous system is the change in the amplitude-frequency characteristics of the EEG. In this regard, some aspects of the neurophysiological mechanisms of the formation of this situation during the exam, from the point of view of both theoretical and applied nature, are of great interest. In addition, the age-related aspects of these changes and EEG correlates during the emotional situation of various physiological functions and the study of their integration reactivity is of great importance. Purpose. Research comparative study of age-related patterns of changes in dnamics during the emotional stress of the examination process EEG-amplitude of electrical activity of alpha, beta, delta and theta waves in the parietal lobe of the brain in 1st and 5th year students of the Faculty of Biology and Chemistry with different types of temperament. Materials and methods. The studies were carried out 2 months before exams on ordinary days (ND), 30 minutes before the exam (BE) and 30 minutes after the exam (AE). Before the start of the study, the type of temperament of the nervous system was determined in students according to the tests of G. Aysenck. Situational anxiety and individual anxiety was determined in three different situations according to D.D. Spielberg using the express version of the test questionnaires. In electrophysiological studies, an EEG of the cerebral cortex of the parietal lobe (P right and left) was carried out for 10-12 minutes. Results: It was found that, depending on the temperament of the nervous system in 1st and 5th year students, there is a significant difference between different types in the electrical activity of the brain. In addition, there is a reliable difference between groups in terms of statistics. In contrast, at the same age, when comparing the periods of ND, BE and AE in the melancholic type, statistical reliability was obtained. In 17-year-old students of the melancholic type in the period of BE and AE, in each of the paired (left and right) parietal lobes of the brain, the amplitude of the EEG delta, theta and alpha waves of the first semester changes along an increasing line due to the influence of emotional tension in an anxious situation. However, for the same students, beta waves change in two phases. During the examination process, there are no sharp deviations in the rhythm of the amplitude of the EEG waves in the left and right parietal lobes of the brain in the left and right parietal lobes of the melancholic type from the influence of emotional stress.In the examination situation in 5th year students, the neurophysiological correlator of emotional stress depending on changes in activity in different in the lobes of the brain, in contrast to 1st year students, there are no changes in the same indicators between different groups. Conclusion: Depending on the strength, mobility and stability of the nervous system, changes in the rhythms of the amplitude of the EEG brain waves during the DE period and after have a different character. In the amplitude of most PE waves, partial decreases are observed.
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