Provide a real life human example of classical conditioning from your own life (either you or someone in your life). Label the unconditioned stimulus (UCS), unconditioned response (UCR), conditioned stimulus (CS) and conditioned response (CR). The UCS and UCR are the naturally occurring part that does not require learning for the association to take place. We don’t have to teach a dog to salivate when food is placed in his mouth, he just does it naturally based on his biological reflexes.