[Brain biopotential mapping in emotional and cognitive pathology].

The EEG rhythms spectral power and intracortical connections were studied in depressive and schizophrenic patients in four schematically outlined main cortical quadrants. In depressive patients two cortical quadrants--right anterior and left posterior ones appeared to be predominantly involved in negative emotions regulation. Alpha-rhythm spectral power and cortical connections in these areas were decreased, pointing to their relative hyperactivation and functional disturbances. Schizophrenics patients were divided into two groups--with the predominance of "positive" and "negative" symptoms. In the first group there was revealed the decrease of the most EEG rhythms spectral power only in parietal areas, on the second one--in all cortical areas. There was also the significant alpha-rhythm spectral power asymmetry, different in the two groups of schizophrenic patients. In "positive" schizophrenics the decrease of alpha-rhythm spectral power was revealed in parietal and occipital areas of the right hemisphere, and in "negative" ones--vice versa, these results pointing of the relatively higher activation of the right posterior quadrant in the former group and of the left posterior quadrant in the latter one. In the anterior cortical quadrants the intracortical connections were however higher in the left hemisphere in "positive" and in the right one--in "negative" schizophrenics. Thus, there are some contradictory results obtained by different methods in anterior and posterior cortical quadrants in each hemisphere, these results being of opposite directions in patients with "positive" and "negative" manifestations. "Region of interest" (ROI) in schizophrenics appeared to be predominantly the frontal and temporal ones, while the "Rhythm of interest"--beta2.