Oddly Wired
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motivation

You stop loving things when you are paid.

Introducing external rewards for an activity you enjoy can reduce your intrinsic motivation to do it.

Researchers found that children who were promised a reward for drawing spent less time drawing later compared to those who received no reward. Once you label an activity as work in exchange for payment, your brain shifts from internal curiosity to external calculation. You may lose the drive that made the task enjoyable.

Sometimes incentives undermine your own sense of purpose.

Where this comes from

Study
Lepper, Greene, and Nisbett, 1973
What the check found
While the specific quote is missing from the provided text, the claim accurately describes the seminal findings of Lepper, Greene, and Nisbett (1973), which is a foundational study in social psychology.
Confidence
Solid, with limits

Related

One of these every day, and every one names the study it came from. When a finding is contested, it says so.