Drive

The Discovery of Internal Motivation

In the mid-20th century, psychologist Harry F. Harlow conducted an experiment with rhesus monkeys that challenged the fundamental understanding of why living creatures behave the way they do. He gave the monkeys a simple mechanical puzzle, expecting they would ignore it unless offered a reward. Instead, the monkeys began playing with and solving the puzzles with intense focus and apparent enjoyment, despite receiving no food, water, or praise. At the time, science recognized only two main drivers of behavior: the biological drive for survival and the external drive for rewards and punishments. Harlow realized he had discovered a third drive, which was the internal satisfaction of performing the task itself.

The discovery became even more puzzling when Harlow tried to improve the monkeys' performance by offering them raisins as a reward. Conventional wisdom suggested that adding an external incentive would make them work faster, but the exact opposite happened. The monkeys made more errors and solved the puzzles less frequently. The introduction of a reward seemed to disrupt their natural interest in the activity. While Harlow urged the scientific community to rethink human motivation based on these findings, he eventually moved on to other research, leaving this third drive largely unexplored for two decades.

In 1969, Edward Deci, a graduate student at Carnegie Mellon University, revisited these ideas using a popular block puzzle called the Soma cube. He divided participants into two groups to test how money affected their dedication to the task. On the second day of the experiment, he paid the first group for every puzzle they solved while the second group remained unpaid. As expected, the paid group spent more time on the puzzles. However, on the third day, when Deci told the first group there was no more money left to pay them, their behavior shifted dramatically. They spent significantly less time on the puzzles than they had on the first day, and less time than the group that had never been paid at all.

These experiments revealed a fundamental truth that many modern organizations still overlook today. External rewards can actually act like a jolt of caffeine that provides a short-term boost but ultimately drains long-term interest. When money or prizes are used as the primary motivator for an inherently interesting task, people often lose their natural curiosity and drive. There is a profound mismatch between what science understands about motivation and how businesses and schools actually operate. To truly thrive, society must move away from the carrot and stick approach and instead nurture the internal drive for autonomy, mastery, and purpose.