Final answer:
The cessation of Steven's behavior of hitting his sister after his toys were taken away is an example of operant conditioning, where punishment results in a behavior change.
Step-by-step explanation:
The situation with Steven stopping the behavior of hitting his sister after his parents took away his toys and games for a week demonstrates the process of operant conditioning. Operant conditioning is a method of learning that occurs through rewards and punishments for behavior. In this case, the removal of Steven's toys and games acted as a punishment, which led to a decrease in the unwanted behavior of hitting his sister.