COMPARISON BETWEEN THE LOCAL AND GLOBAL S PATIAL-TEMPORAL ORGANIZATION OF HUMAN BRAIN POTENTIALS DURING SOLVING THE INTELLECTUAL TASK

Spectral characteristics of the local and global EEG spatial-temporal organization were studied in 10 healthy subjects during solving the co mplicated intellectual task. Techniques of evaluation of successive to pograms and point frequency mapping were applied. Two different types of the global spatial-temporal organization of brain potentials were o bserved. 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 th e dominant spectral frequencies and their redistribution under differe nt functional loads. Comparizon of the characteristics of the spatial- temporal organization of global bioelectrical processes and maps of th e dominant rhythms in EEG power spectra made it possible to reveal the new relations in bioelectrical processes.