Reinforcement is a term in operant conditioning and behavior analysis for the process of increasing the rate or probability of a behavior (e.g., pulling a lever more frequently) in the form of a "response" by the delivery or emergence of a stimulus (e.g. a candy) immediately or shortly after performing the behavior. The response strength is assessed by measuring frequency, duration, latency, accuracy, and/or persistence of the response after reinforcement stops. Experimental behavior analysts measured the rate of responses as a primary demonstration of learning and performance in non-humans (e.g., the number of times a pigeon pecks a key in a 10-minute session). A reinforcer is the stimulus, event, or situation that is presented or otherwise emerges when the response behavior is performed.
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