[Visual evoked potentials produced by monocular flash stimuli in the cerebral cortex of the rabbit. I. Typology].

Visually evoked potentials obtained from the cerebral cortex of pigmented rabbits in response to monocularly applied flashes were studied. In agreement with their morphology, the VEP of the cerebral cortex of the rabbit were classified in three fundamental types: the first one is characterized by the presence of a large positive wave, (P1), followed by a negative wave, (N1), and finally, another positive wave, (P2); these last two being of quite variable amplitudes. The second one is characterized by an initial large negative wave, (N1), followed by a usually large positive wave, (P2). Should a positive, (P1), appear previous to N1 there would be little amplitude. The third one is characterized by the presentation of an early negative wave, (N0), of variable amplitude. This is usually followed by a large wave, (P1). N1 and P2 are present but their amplitude is variable.