What is the purpose of exposing an animal to a variable reinforcement schedule (VR) during training?

• A. Reward consistently after every correct response
• B. Reinforce only after a fixed number of trials
• C. Ensure the animal is used to a variable reinforcement schedule
• D. Avoid reinforcement to promote independence

Answer: (C)

Exposing an animal to a variable reinforcement schedule during training teaches it to cope with unpredictability and to keep performing the behavior even when rewards aren’t given after every attempt. This leads to higher and more persistent responding and greater resistance to extinction, which is especially useful in real-life tasks where rewards aren’t guaranteed each time.

That’s why this option is the best: it emphasizes acclimating the animal to the irregular timing of rewards so the behavior remains strong even when reinforcement is unpredictable. In contrast, rewarding after every correct response relies on continuous reinforcement, a fixed-number schedule relies on predictability, and avoiding reinforcement altogether would undermine learning and motivation.