Abstract
Cats were trained to press a bar for a food reward in response to a buzzer tone lasting 1 sec (CS). The animals were rewarded when they pressed the bar with a fixed delay after the onset of CS. Flashes were repeated at 1.0 Hz following CS and evoked potentials of the visual cortex to these flashes (FEPs) were recorded and analyzed. When repetitive flashes followed CS, occurrence of bar pressing was timed more accurately than when they did not. It was found in this case that while an initial deflection of FEPs was left unchanged through one trial, the following components were inhibited immediately before bar pressing and facilitated after it.
