The type of operant conditioning in which Grant decides to treat his dog until he brings the paper is positive reinforcement kind of operant conditioning.
In the field of psychology, operant conditioning is a psychological reinforcement where a certain organism is taught a behavior by either punishing him for an undesired behavior or rewarding him for the desired behavior.
Positive reinforcement occurs when you are rewarding an organism for a behavior that you like and want the organism to continue more of that behavior.
In the scenario mentioned in the question, Grant is using positive reinforcement by treating the dog when he acts according to the desired behavior. By treating him, he is using positive reinforcement.
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