PERSON
Harry Harlow
American psychologist (1905–1981) whose 1949 rhesus monkey experiments produced the empirical puzzle that the behavioral framework could not solve — and that Pink's third drive eventually explained.
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 You On AI Field Guide
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.