[A comparison of the restructurings in the spatial-temporal organization of the cortical potentials from the human cerebral hemispheres with the EEG frequency characteristics during the solving of a cognitive task].

Spectral characteristics of the local and global EEG spatial-temporal organization were studied in 10 healthy subjects during solving the complicated intellectual tasks. Techniques of evaluation of successive topograms and point frequency mapping were applied. Two different types of the global spatial-temporal organization of brain potentials were observed. Increased delta in EEG spectra characterized the task solving. The alpha- and beta-rhythms occupied the limited part of the cortex. Point mapping enabled clarification of the spatial distribution of the dominant spectral frequencies and their redistribution under different functional loads. Comparison of the characteristics of the spatial-temporal organization of global bioelectrical processes and maps of the dominant rhythms in EEG power spectra made it possible to reveal the new relations in bioelectrical processes.