why does receiving rewards for tasks sometimes decrease motivation? In your explanation, discuss work on intrinsic vs. extrinsic motivation and the over-justification effect. Second, what factors explain why rewards sometimes decrease motivation (as in the case of the overjustification effect), and what factors explain why rewards sometimes increase motivation (as in the case of operant conditioning)? In your explanation, provide personal examples of when receiving a reward has increased, as well as decreased motivation to work on a task.