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Clark L. Hull
Clark Leonard Hull (May 24, 1884 – May 10, 1952) was an influential American psychologist who sought to explain learning and motivation by scientific laws of behavior. Hull is known for his debates with Edward C. Tolman. He is also known for his work in drive theory.
Hull spent the mature part of his career at Yale University, where he was recruited by the president and former-psychologist, James Rowland Angell. He performed research demonstrating that his theories could predict behavior. His most significant works were the ''Mathematico-Deductive Theory of Rote Learning'' (1940), and ''Principles of Behavior'' (1943), which established his analysis of animal learning and conditioning as the dominant learning theory of its time. Hull’s model is expressed in biological terms: Organisms suffer deprivation; deprivation creates needs; needs activate drives; drives activate behavior; behavior is goal directed; achieving the goal has survival value.
He is perhaps best known for the "goal gradient" effect or hypothesis, wherein organisms spend disproportionate amounts of effort in the final stages of attainment of the object of drives. Due to the lack of popularity of behaviorism in modern contexts it is little referenced today or bracketed as obsolete.〔(''The Goal-Gradient Hypothesis Resurrected: Purchase Acceleration, Illusionary Goal Progress, and Customer Retention'' ) Ran Kivetz, Columbia University〕 Nonetheless, a ''Review of General Psychology'' survey, published in 2002, ranked Hull as the 21st most cited psychologist of the 20th century.
==Background==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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