Stimulus-response theory
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Stimulus-response theory, referred to a S-R theory, is a theoretical model of behavioral psychology that suggests animals, and people, can learn to associate a new stimulus- the conditioned stimulus (CS)- with a pre-existing stimulus - the unconditioned stimulus (UCS), and can think, feel or respond to the CS as if it were actually the UCS. This theory arose forms a key component of behavioral psychology, and the process is referred to as classical conditioning.
The opposing theory, put forward by cognitive behaviorists, is stimulus-stimulus theory (S-S theory).