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GRADIENTS OF APPROACH AND AVOIDANCE RESPONSES AND THEIR RELATION TO LEVEL OF MOTIVATION
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DENNY RM, 1948, AM PSYCHOL, V3, P250
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Fitts PM, 1940, PEDAGOG SEMIN J GEN, V57, P165
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The effect of spacing of trials on the acquisition and extinction of a conditioned operant response
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JOURNAL OF EXPERIMENTAL PSYCHOLOGY,
1941, 29 (03)
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THE RELATION OF SECONDARY REINFORCEMENT TO DELAYED REWARD IN VISUAL DISCRIMINATION LEARNING
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1948, 38 (01)
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Hilgard E. R., 1940, CONDITIONING LEARNIN
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HULL CL, 1943, PRINCIPLES BEHAVIOR