Skinner created a special cage called a ‘skinner box’ to test the operant conditioning in rats . The rat moves around the cage and when it accidentally presses the lever a food pellet falls into the cage . The very hungry rat very quickly learns that it can get food by pressing the lever ( positive reinforcement) • Then skinner adapted his experiment and this time the rats recieved an electric shock through the floor ,in order to stop the shock, the rats had to press the lever ( Negative reinforcement)