[Changes in reactivity of rat visual system during wake-sleep cycle].

The changes in amplitude of primary responses evoked at cortical level by paired pulses delivered into the optic nerve, have been statistically compared during seven stages of sleep and wakefulness. Results are in agreement with changes in reactivity observed by other authors in the cat; an unexpected but significant decrease in reactivity has however been obtained during eyemovements when compared with other periods of paradoxical sleep.