In an echo of what Harlow discovered two decades earlier, Deci revealed that human motivation seemed to operate by laws that ran counter to what most scientists and citizens believed. From the office to the playing field, we knew what got people going. Rewards—especially cold, hard cash—intensified interest and enhanced performance. What Deci found, and then confirmed in two additional studies he conducted shortly thereafter, was almost the opposite. “When money is used as an external reward for some activity, the subjects lose intrinsic interest for the activity,” he wrote.5 Rewards can
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