Harry Harlow
Harry Harlow was an American psychologist at the University of Wisconsin whose work on primate behavior produced findings that contradicted both prevailing theories of motivation in mid-twentieth-century psychology. His 1949 experiments with rhesus monkeys showed that the animals solved mechanical puzzles without food rewards and performed worse when food rewards were introduced. Harlow proposed that 'performance of the task provides intrinsic reward' — coining the term that Deci, Ryan, Pink, and subsequent generations would build upon. His work established the empirical foundation for the third drive decades before the framework had a name. Harlow is also known, and controversial, for his later maternal-deprivation experiments with infant monkeys.
In the AI Story
The behavioral establishment's response to Harlow's puzzle findings was largely to ignore them. The framework did not have a vocabulary for intrinsic motivation, and the finding that contradicted the framework could not easily be incorporated into it.
Harlow's contribution to motivation science was the demonstration that a drive existed beyond biology and behavioral conditioning. What that drive was, how it operated, and under what conditions it flourished would take another thirty years of research to specify.
Edward Deci and Richard Ryan, building on Harlow's foundation, developed self-determination theory across the 1970s and 1980s, producing the empirical architecture that Pink later synthesized into his three-pillar framework.
Origin
Harlow was born in Fairfield, Iowa, in 1905 and spent his academic career at the University of Wisconsin–Madison, where he established the primate laboratory that produced his most consequential work.
His 1949 paper 'Learning Motivated by a Manipulation Drive' reported the puzzle experiments. His 1958 address 'The Nature of Love' presented the maternal-deprivation work that became both famous and ethically contested.
Key Ideas
Intrinsic reward coined. Harlow named the phenomenon that contradicted behaviorism's framework.
External reward can diminish performance. Food rewards reduced rather than enhanced puzzle-solving — an early demonstration of what became the overjustification effect.
The animal evidence matters. Intrinsic motivation appears in non-human primates, suggesting it is not merely a cultural construct.
Foundation for later work. Deci, Ryan, Amabile, and Pink all built on Harlow's original empirical demonstration.
Appears in the Orange Pill Cycle
Further reading
- Harry F. Harlow, 'Learning Motivated by a Manipulation Drive' (Journal of Experimental Psychology, 1950)
- Deborah Blum, Love at Goon Park: Harry Harlow and the Science of Affection (Perseus, 2002)