Success of the test task performance by students with different spectral Delta a-rhythm characteristics in the baseline electroencephalogram

The subjects were divided into two groups according to the Delta *a1 and Delta *a2 spectral powers in the occipital derivations of the EEG recorded in the initial state with their eyes closed. Group I included subjects whose Delta *a1-rhythm spectral power (7--10 Hz) was more than 70% of the total Delta *a-rhythm band power. Group II included subjects whose Delta *a2-rhythm spectral power (10--13 Hz) was more than 70% of the total Delta *a-rhythm band power. It was established that, in the tasks requiring prediction of the subsequent result (memorizing a certain sequence of signals and its subsequent reproduction on the monitor screen), group I subjects differed from group II subjects in fewer sequence errors and a greater number of accurate predictions. In group II subjects, a decrease in the [thetav]-band spectral power in the EEG of the central and frontal cortical areas was observed compared to the baseline. Therefore, the EEG [thetav]-rhythm power at the memorizing stage was lower in them than in group II subjects. The results suggest that the baseline characteristics of [thetav]-activity can be regarded as prognostic criteria of similar types of activity.