[Motivation and biological significance of photically evoked potentials of the visual cortex of rats].

In 4 rats the photically evoked potential of the visual cortex was recorded during a conditioned reflex. As compared with the evoked potentials following flashes without biological meaning fullness significant differences occur in all rats at the same time intervals during the performance of the conditioned reflex. These differences remain unaltered when motivation increases an dare independent of the configuration of the evoked potentials following flashes without biological significance.