Book Definition: In classical conditioning, the response elicited by an unconditioned stimulus without prior learning.

In Your Own Words

  • Your innate reaction or innate reflex to a stimulus.
  • An involuntary and natural reaction to a stimulus.
  • Responses that are completely natural and occur without someone having any prior learning.
  • Innate reactions to a stimulus.
  • Reactions to a stimulus that are not learned but innate.
  • An innate response to a stimulus.
  • A response that does not have to be learned.


  • Unconditioned Response
  • In Pavlov's dogs, the dogs reacted with a salivation(UCR) reflex when food was first presented to them.
  • You naturally tear up to the smell of onions and sweaty gym socks, without prior learning.
  • If you were standing by a fence and out of no where a barking, growling dog jumps on the fence behind you.You naturally jump from it.
  • You touch a hot stove and pull your hand away because of the pain.
  • In the Lemon Powder Day experiment you salivate at the taste of the lemon powder even before you start the experiment.
  • When you smell a foul odor (UCS) you cringe your face (UCR).
  • When a doctor hits the space inbetween your knee cap and leg your leg jerks. The hit is the unconditioned stimulus, and the uncontrollable jerk is the uconditioned response.
  • You lose control of your bladder when you get scared.
  • You automatically flinch when someone pretends to hit you.
  • You squeeze a lemon on your tounge and you cringe because it is sour.

Additional Resources