How can experiments show that a rat learned by watching another rat press a lever?

To determine if a rat has learned through observation, researchers use an experimental setup involving an "observer" rat and a "demonstrator" rat. The demonstrator is trained to press a lever to receive food, while the observer is placed in a position to watch this process.1

To establish that genuine observational learning has occurred, the experiment must demonstrate that the observer rat—which has never pressed a lever before—performs the action significantly more rapidly than a control group of rats that were denied the opportunity to watch the demonstrator.1

This methodology helps distinguish between simple social facilitation and actual learning. If the observer rat successfully acquires the skill through watching, it provides evidence that the animal has gained knowledge from the demonstrator's actions rather than relying solely on trial and error. However, researchers often conduct more elaborate experiments to clarify exactly what information the observer has acquired, as it remains a complex challenge to isolate the specific cognitive mechanisms involved in such animal learning.1