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Unconditioned Reflex
Unconditioned Response
Unconditioned Stimuli
Unconditioned Stimulus

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Dominic John Repici
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Unconditioned Stimulus

US - A stimulus that causes an unconditioned response on the part of the organism.

In Pavlov's dog experiments, when the dog was presented with the site and smell of food, it salivated. In this case, the site and smell of food is the unconditioned stimulus, because it evokes salivation (the unconditioned response) in the dog naturally, without the dog having to be trained.

Also: Classical Conditioning        


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