Spatial characteristics of human EEG high-frequency range alpha rhythm in cognitive activity in conditions of exogenous noise

Aim: establishing a connection between the spatial characteristics of EEG high-frequency alpha range and efficiency of cognitive activity with attention switching in the conditions of exogenous noise. Methods. EEG was registered monopolar, by system of '10-20' while right-handed 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. Analysis of coherence was performed basing on fast Fourier transform (BRAINSYS software). Average value of the coherence function of high-frequency alpha band (10-13 Hz) was calculated for all pairs of electrodes. Group of noise stable (n=17) and noise non-stable (n=18) subjects were marked, basing on differences between efficiency of their cognitive activity. Results. Analysis of coherent interactions of EEG alpha potentials on different stages of examination detected a determined topographic net of functional bonds of high-frequency alpha rhythm, which combines temporal, central and frontal zones of cortex with focus localization in the left temporal area...