Abstract
Phase shifts in EEG potentials were investigated in the rabbit cortex during photic stimulation and in controls. Degree of phase shift in the predominating theta waves was found to increase gradually with increasing distance between recording electrodes both with and without photic stimulation, pointing to the existence of a phase gradient — the conditions appropriate to the greater proportion of motor reactions. Photic stimulation induces an increase in numbers of non-phasic EEG waves recorded from close-lying sites as well as reduced scatter in levels of phase shift between EEG of the sensorimotor and visual cortex, thus rendering phase shifts more stable. Irradiation of excitation from the visual to the motor analyzer in response to photic stimulation occurs against a background of high correlation coefficient and coherent function levels and with a phase shift from 0 to 10–11°.
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