Pavlov used two unconditioned stimuli: a food stimulus, which produced a positive reflex, and an acid stimulus, which produced a negative one. In several experiments, the salivary secretion was conditioned to metronome beats, to the sight of geometrical figures and letters, to cutaneous stimuli, and to the odor of camphor. A conditioned reflex occurs when an object is placed in the mouth of the dog and its properties excite the simple reflex apparatus of the salivary glands.
KeywordsConditioned Stimulus Unconditioned Stimulus Conditioned Reflex Operant Conditioning Psychosomatic Medicine
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