Unconditioned stimulus is generally defined as a natural response to stimuli without prior conditioning or any alteration to instinctive responses. The principal of unconditioned stimulus it is important in the areas of behaviorism, psychoanalysis, and measuring the effect of condition stimuli response.
Examples of Unconditioned Stimulus:
|Natural response to smells and taste, or other sensory stimuli.|
One of Pavlov's dogs with a surgically implanted cannula to measure salivation, Pavlov Museum, 2005