FIELD: medicine. SUBSTANCE: method involves using non-polarizing silver chloride electrodes to read biopotential values in recording device functional mode with time constant not less than 1 s or in direct current mode. Power spectra of extremely slow functional activity are calculated and divided into subranges of 0.03-0.2, 0.2-0.4, 0.4-0.65, 0.65-0.85, 0.85-1.0 Hz for their being represented separately with respect to each subrange on the graphic scalp image based on relation set between the power spectrum values and color intensity values according to white-black and color scale. Changes in power values in the subranges pointed out are detectable from changes observed in the corresponding parts of the graphic image. EFFECT: enhanced effectiveness in evaluating functional state of brain activity. 3 dwg
