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60 Changes Made to Gingrich's Wikipedia: I normally don’t post about politics but this is also...
The overjustification effect occurs when an external incentive such as money or prizes decreases a person's intrinsic motivation to perform a task. According to self-perception theory, people pay more attention to the incentive, and less attention to the enjoyment and satisfaction that they receive from performing the activity. The overall effect is a shift in motivation to extrinsic factors and the undermining of pre-existing intrinsic motivation.
This is a great article pointing out the strengths of Wikipedia and the weaknesses of Google's Knol. Wikipedia aggregates all the knowledge on a topic in one place. Knol's model basically encourages everyone to create their own, resulting in inferior and scattered content. When Knol first came out people thought the ability for people to make money on their knowledge would pull away from Wikipedia. Doesn't look like that's the case.
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