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20/01/1944 American psychologist James McKeen Cattell dies

10:08

James McKeen Cattell: Mental Testing

At the beginning of his career, Cattell regarded psychology at best a minor field of study, or at worst a pseudoscience. Later he helped to establish it as a legitimate science, worthy of study. He started with measuring of simple phenomena like reaction times and advanced to complex ones, like intelligence or personality.
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