How Do Behavior Technicians Help Toddlers Learn New Skills?

The process by which an RBT reinforces closer approximations to the target behavior of an isolated index finger point is called shaping, a commonly used technique in operant conditioning and behavior modification.

Explanation:

The process described in the question where an RBT (Registered Behavior Technician) reinforces closer approximations until reaching the target behavior of an isolated index finger point is best described by the term shaping. Shaping involves reinforcing successive approximations of a target behavior, which teaches learners to gradually achieve a goal behavior that they are unlikely to display spontaneously.

This technique is commonly used both in operant conditioning with animals and in behavior modification strategies with children. By systematically rewarding responses that each more closely resemble the desired behavior, an RBT encourages the child to refine their behavior until it matches the target behavior.