Another quick one, prompted by an interesting behaviour exhibited by my daughter today that taught me rather a lot about extrinsic rewards.
I have mentioned before the research that has been done on motivation in the past by the likes of Edward Deci and the writing of Dan Pink and more. All of them point to the same thing, extrinsic rewards are bad for intrinsic motivation. The basic reasoning is that at some point, no matter how careful you are, the reward will become the reason to do the task. The extrinsic reward replaces the original intrinsic motivation.