Аннтотация

© 2018 Maik Nauka-Interperiodica Publishing. All rights reserved. Changes in the power and coherence of the EEG theta-1 (4-6 Hz) and theta-2 (6-8 Hz) activity were studied in subjects (31 males, 18-21 years old) with different performance levels in logical tasks. EEG was recorded to the International 10-20 System from the occipital (O2, O1), parietal (PA, P3), central (C4, C3), frontal (FA, F3), and temporal (T4, 73) leads. The achievement of better performance during the tests based on logical reasoning positively correlated with higher spectral power of theta-1 band potentials in the left cortical areas. The theta-1 band potential power increased during testing and compared to the previous period in the left occipital, parietal, central and temporal cortical areas. The simultaneous increasing in intrahemispheric coherence of theta-1 band potentials was observed in the left frontal and central areas, as well as in the left frontal and parietal cortical areas. The spectral power of theta-2 band potentials decreased during testing and compared to the previous period in the right central frontal and temporal cortical areas. The inter- and intrahemispheric coherence of the EEG theta-2 band potentials decreased during testing in the system of relationships with the focus in the left and right occipital and right parietal cortical areas. The desynchronization in the EEG theta 2 band in all cortical areas was observed at transition from a state of quiet wakefulness with eyes closed to a state with eyes open. The conclusion is made about the different functional significance of the electrical activity of the low and high frequency theta EEG bands under cognitive activity.