Overjustification effect
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The overjustification effect (also called the undermining effect) is the effect whereby giving someone an incentive (monetary or otherwise) to do something that they already enjoy doing decreases their intrinsic motivation to do it. As a result of the extrinsic incentive, the person views his or her actions as externally controlled rather than intrinsically appealing. According to Self-perception theory, people undergo overjustification effect because by observing what they do and why they did it, the extrinsic motivation appears to be the main cause and so undermines their intrinsic motivation.
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