[Study of phase relations of potentials in the rabbit cerebral cortex in various functional states]

Phasic shifts of cortical biopotentials were studied in rabbits during background activity and photic stimulation. It has been found that in most cases the phasic shift of dominating theta-waves gradually increases with the distance between the electrodes both under conditions of the background activity and photic stimulation. This confirms the presence of the phase gradient at which most motor reactions are realized. Photic stimulation increases the number of synphasic oscillations in the EEG recorded from neighbouring points and decreases the dispersion of values of the phasic shift between the EEG of the sensorimotor and visual cortices, i.e. it makes phasic shifts more stable. Irradiation of excitation from the visual analyzer to the motor one in response to photic stimulation is realized in most cases against the background of high values of the correlation coefficients, coherent function and phasic shift from 0 to 10-11 degrees.