FIELD: medicine. SUBSTANCE: method involves evaluating recorded electric encephalogram detecting main rhythms according to a formula and additionally determining frequencies relationship in the electric encephalogram, relationship among indexes of these frequencies and mean amplitude ratios for 10 s long epoch. The state is considered to be satisfactory, if the values of the coefficients of proportionality of frequencies and frequency indexes are equal to 1,309 ± 0,07 and amplitude ratios are equal to 1,0 ± 0,05. The values being changed from 10 to 20% functional disturbance is considered to take place. If the change exceeds 20% functional stress is considered to take place. EFFECT: enhanced accuracy in determining functional state of the central nervous system. 3 tbl
