It is, of course, understandable that for so many years study of the effective person was slighted. It was inevitable that when psychology sought to cut its affiliation with its parent discipline philosophy toward the end of the last century and attempted to become a science it turned its attention to simple problems—partial responses, simple sensory, perceptual, and motor responses, simple learning, and the like—for the study of which manageable techniques were available.
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D. J. Mackinnon (1960) studied this question.
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