[Work capacity and space-time organization of cerebral biopotentials in operators against a background of rhythmic...

The effect of light 12 Hz stimulus on the productivity of operator's functions and intercentral integration of neocortical systems was studied in terms of biopotential space-time parameters. EEGs from 8 neocortical areas were recorded in 18 subjects playing an electronic game with a computer (simulated operator's function). A microcomputer Electronika-60 was used for automatic analysis of EEG (spectral-coherent analysis) and operator's efficiency. Light 12 Hz stimulus caused a significant (36%) decrease of operator's productivity (p less than 0.05). In the case of light flickering the density of biopotentials corresponding to the light stimulus frequency increased significantly (30-52%) (p less than 0.05). Coherence of this frequency grew by 17-40%. However, in the 6-8 Hz band the spectral density and coherence of biopotentials of the frontal, motor and parietal areas decreased by 16-21% and 14-23%, respectively (p less than 0.05). Light effects produced disorders in interhemisphere asymmetry. Changes in the spectral parameters of motor areas of the left and right hemispheres and disturbances of interhemisphere interaction were detected. It is assumed that the resistance of the motor control system to light stimulus during operator's activity depends on the resistance of space-time integration of functionally important areas to the synchronizing effect of light interference.