Abstract text (incl. figure legends and references)

The problem of aggression and aggressive behavior in science becomes relevant when a society experiences critical periods of development. Therefore, it is necessary to search for methods of psycho-correction to reduce the level of aggression and improve the psycho-emotional state of adolescent, to prevent the formation of personality with deviant behavior. Neurofeedback is non-invasive and captivating tool for the regulation of aggressive behavior may play a great role for subject's successful social adaptation. Microstate analysis is a prospective method frequently used for assessing brain dynamics reflected in the EEG under varying conditions and brain states. Of specific interest is the application of microstates approach in a neurofeedback domain.

It is still under consideration, which specific microstates are more efficient for persons with high level of aggression during alpha-training. In our study we examined the resting state EEG of 20 subjects (age - 13-14 yy) before and after 5th and 10th session of alpha- training. The EEG microstates were calculated for the whole EEG spectra using eLoreta software.

It was found that electrical activity in adolescents with high levels of aggression before alpha-training can be explained by 4 microstates. In girls 47% of the time was described by microstate A, 13% - B, 12% - C, and 28% - D. In boys 29 % of time was described microstate A, 23 % - В, 20 % - С, 31 % - D. After 10th session of alpha-training in adolescent-girls, microstate A (auditory network) decreases and microstate D (attention network) and C (saliency network) increase. Boys-adolescent were characterized by decrease in microstate A (visual network) and increase microstate C. As a result of alpha training, in boys compared with girls build neural networks with the involvement of the frontal cortex, which leads to more conscious control of aggression and the choice of a behavioral response plan with less involvement of the psycho-emotional component.