A group of rats was run through a maze for 12 days. on days 1 through 10, there was no food reward at the end of the maze, and the rats made many errors as they slowly moved through the maze. on day 11, researchers placed a food reward at the end of the maze. with the food reward in place, the rats ran the maze very quickly and with few errors. according to psychologist _____, this experiment demonstrated a phenomenon called _____.