Why Rewarding Yourself for Something You Already Loved Doing Can Kill the Love
A landmark 1971 study found something strange: paying people for an activity they already enjoyed made them enjoy it less once the payment stopped. Later research found exactly why, and how to reward without the damage.
A man takes up running purely because he loves how it feels, no goal attached, no tracker, nothing but the run itself. A few months in, he starts chasing a specific time, tracking splits, rewarding himself with new gear for hitting targets. It should make him more motivated. Research on what psychologists call the overjustification effect suggests it can, counterintuitively, do the opposite, quietly converting something he used to do purely for its own sake into something that now requires an external reason to keep doing at all.
The effect was first demonstrated by psychologist Edward Deci in a 1971 laboratory experiment, and extended shortly after by Mark Lepper and colleagues in a well known study with children and drawing. In both cases, the pattern held: introduce an external reward for something a person already found genuinely enjoyable, and once the reward stops, interest in the activity often drops below where it started, not just back to baseline. A large 1999 meta-analysis by Deci, Richard Koestner, and Ryan, reviewing 128 separate studies, confirmed the pattern held broadly across settings: rewards tied to simply engaging in a task, completing it, or performing well at it all measurably reduced people's free choice interest in doing it again once the reward was gone. The same meta-analysis found one clear exception worth knowing: positive verbal feedback, praise rather than a tangible prize, actually increased both engagement and self-reported interest rather than undermining it.
The mechanism researchers landed on, called cognitive evaluation theory, is more specific and more useful than just rewards are bad. What actually determines the effect is how the reward gets interpreted. A reward experienced as controlling, do this and you get that, tends to undermine intrinsic motivation, because it shifts the felt reason for the behavior from I want to from I am being managed into it. A reward experienced instead as informational, genuine recognition that signals real competence, tends to have the opposite effect, reinforcing rather than undermining the original motivation. The same bonus, delivered two different ways, can either strengthen or quietly erode the exact drive it was meant to reward.
The mechanism researchers landed on, called cognitive evaluation theory, is more specific and more useful than just rewards are bad.
This has a specific, practical edge for men trying to build motivation around something they already care about. Tying a new fitness habit to a points system, a strict tracker, or a reward chart can genuinely work in the short term while simultaneously training the underlying interest to depend on the external structure rather than the activity itself, so that the moment the tracker gets abandoned, so does the motivation that was supposedly being built. The research found this undermining effect was actually strongest specifically among people who started with the highest genuine interest in the activity, meaning the men who cared the most going in had the most to lose from converting a loved activity into a managed one.
None of this means external structure or reward is always a mistake. It means paying attention to how a reward is framed and experienced matters more than whether one exists at all. Verbal recognition and genuine acknowledgment of real progress, according to the same body of research, tends to support motivation rather than erode it. Tangible, expected rewards tied tightly to performance are the specific version worth watching, particularly for anything you actually want to keep loving once nobody is tracking it anymore.