The operant conditioning concept of positive reinforcement is illustrated when the next day, her boss gave her a gift certificate to a local coffee shop. As a result, Janice now regularly cleans out the office refrigerator.
Positive reinforcement simply means the process of establishing a pattern of behavior by giving a reward when such behavior is exhibited.
In this case, since Janice cleaned out the office refrigerator without being asked and her boss gave her a gift certificate to a local coffee shop, she'll continually clean it.
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