Final answer:
Tolman's work with rats in mazes led to the discovery of cognitive maps.
Step-by-step explanation:
Tolman's work with rats in mazes led to the discovery of cognitive maps. In his experiments, Tolman placed hungry rats in a maze without a reward for finding their way through it. He found that the rats developed a mental picture of the maze, which he called a cognitive map. This demonstrated the power of cognitive learning and how it is not limited to humans.