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He was, however, willing to propose unseen physiological processes that might explain his observations. [15] The behavioristic half-century [ edit ] The work of Thorndike, Pavlov and a little later of the outspoken behaviorist John B. Watson [16] set the direction of much research on animal behavior for more than half a century. During this time there was considerable progress in understanding simple associations; notably, around 1930 the differences between Thorndike's instrumental (or...