Answer:
unconditioned response
Explanation:
Russian physiologist Ivan Pavlov put up the theory of classical conditioning, which is a learning mechanism that takes place through a combination of environmental stimuli and natural stimuli. In simple terms, the unconditioned stimulus ( UCS) induces an unconditioned response in the individual. This signifies that the stimulus in the setting has generated a response that is unconditioned or we can say an unlearned behavior. This a stage before conditioning takes place.