positive reinforcement

encouragement, motivation, incentive, positive urging

In operant conditioning, reinforcement is an increase in the strength of a response following the presentation of a stimulus contingent on that response. Response strength can be assessed by measures such as the frequency with which the response is made (for example, a pigeon may increase the rate at which it pecks a key), or the speed with which it is made (for example, a rat may run a maze faster). The stimulus contingent on a response is called a reinforcer. Reinforcement can only be confirmed retrospectively, as objects, items, food or other potential 'reinforcers' can only be called such by demonstrating increases in behavior after their administration. It is the strength of the response that is reinforced, not the organism.
See more at Wikipedia.org...

Positive reinforcement, n a technique used to encourage a desirable behavior. Also called positive feedback, in which the patient or subject [more]Positive reinforcement - Community and Resources