The role of spatial synchronization of high-frequency beta rhythm biopotentials of EEG in humans with different efficiency of intellectual activity in the conditions of exogenous noise

Aim: To establish connection between spatial characteristics of high-frequency beta2-band of EEG and efficiency of activity with attention switching in conditions of exogenous noise. Methods: EEG was recorded monopolarly in “10-20” system, while healthy participants (n=43; 19-21 year old) passed through Gorbov-Shulte's computer-aided test in form of red-black tables accompanied by the voice noise (VN). Spatial characteristics of beta-rhythm and efficiency of cognitive activity with attention switching in conditions of exogenous noise were analyzed. Analysis of coherence was performed on basis of fast Fourier transformation (software package BRAINSYS). The average value of coherence function (Ccoh) in high-frequency beta-band (20-30 Hz) was calculated for all pairs of leads. Two groups of subjects were marked, basing on differences between efficiency of their cognitive activity. Group of noise stable (n=17) subjects demonstrated high efficiency in conditions of exogenous noise and noise non-stable (n=18) subjects, who demonstrated decrease of time characteristics and increase of number of mistakes in these conditions...