Cognitive evaluation theory

The most detailed explanation for the overjustification effect is cognitive evaluation theory. This theory proposes that tangible rewards (like money) are perceived as controlling or coercive, and act to decrease perceived self-determination and undermine intrinsic motivation. Because unexpected tangible rewards do not motivate behavior during a task, they are less likely to be perceived as controlling, and thus less likely to undermine intrinsic motivation. Informational rewards (like praise) increase perceived self-determination and feelings of competence, and consequently tend to enhance intrinsic motivation.I am just saying......