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Unconditioned Stimulus

Definition

An unconditioned stimulus is something that naturally, or without learning, triggers a response.

Analogy

Think of the unconditioned stimulus as your favorite food. When you see it, you don't need to be taught to feel hungry or salivate; it happens automatically.

Related terms

Reflex: An automatic and immediate reaction to a specific stimulus.

Innate Behavior: A behavior that an organism is born with and does not have to learn.

Stimulus Generalization: The tendency for the conditioned response to occur in response to stimuli that are similar but not identical to the conditioned stimulus.

"Unconditioned Stimulus" appears in:

Practice Questions (3)

  • What was the unconditioned stimulus in John Watson’s experiment with Little Albert?
  • In classical conditioning, what is known as the initial stage when an association between a neutral stimulus and an unconditioned stimulus takes place?
  • What does the term 'unconditioned stimulus' refer to in classical conditioning?


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AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.