[Parameters of the prestimulation EEG during operator recognition of a meaningful photic stimulus].

Comparison of prestimulus EEG parameters with characteristics of recognition of a numeral stimulus showed that the complex of spatial-temporal parameters of the EEG of the operator reflects both the rate of success of the given activity and its quality. Functional state of CNS previous to optimal recognition (70% of efficiency, short reaction time), are characterized by mean level of spatial synchroneity of potentials in both cerebral hemispheres and by mean expressiveness of frequencies from 0.2 to 30 Hz in electrical activity of the majority of studied neocortical areas as compared with the states before recognition with prolonged reaction time and before non-recognition of the stimulus.