Final answer:
The example given is an example of shaping in operant conditioning, where a behavior is taught by rewarding successive approximations of the target behavior.
Step-by-step explanation:
The example given in the question is an example of shaping. Shaping is a technique used in operant conditioning to teach complex behaviors by rewarding successive approximations of the target behavior. In this case, Brian lowered the backboard and used a smaller ball to increase the chances of his son shooting the ball correctly. Once his son had success, Brian gradually raised the backboard and used a larger ball, shaping his son's basketball shooting skills.