In AP Psychology, extinction is the gradual weakening and disappearance of a conditioned response that happens when the conditioned stimulus is repeatedly presented without the unconditioned stimulus, a core step of classical conditioning in Topic 3.7 (Unit 3).
Extinction is what happens when a learned association stops paying off. In classical conditioning, an organism learns that a conditioned stimulus (CS) predicts an unconditioned stimulus (UCS). Pavlov's dogs learned that the bell predicted food. But if you keep ringing the bell and the food never shows up, the conditioned response (salivation) gets weaker and weaker until it stops. That fading process is extinction.
Here's the part that trips people up. Extinction is not erasing or forgetting the learning. It's new learning layered on top of the old learning. The dog isn't deleting "bell means food." It's learning "bell means food... except not anymore." The proof is spontaneous recovery: after a rest period, the extinguished response can pop back up when the CS is presented again, usually weaker than before. If extinction truly erased the association, there would be nothing left to recover.
Extinction lives in Topic 3.7 (Classical Conditioning) in Unit 3: Development and Learning, and it directly supports learning objective 3.7.A: explain how classical conditioning applies to behavior and mental processes. The CED treats acquisition as a series of steps in associative learning, and extinction is one of those steps. You can't fully explain how conditioned responses work without explaining how they fade.
It also matters because extinction is the behavioral perspective in action. Behaviorists focus on observable behavior, and extinction is something you can literally watch and measure (drops of saliva, in Pavlov's case). On the exam, extinction rarely shows up alone. It almost always comes packaged with acquisition and spontaneous recovery as a sequence, so you need to know where it sits in that timeline.
Keep studying AP Psychology Unit 3
Conditioned Response (Unit 3)
Extinction is defined entirely in terms of the conditioned response. The CR is what fades. The unconditioned response never extinguishes, because the UCR is a reflex, not something learned. Only learned responses can be unlearned.
Unconditioned Stimulus (Unit 3)
The UCS is the missing ingredient that causes extinction. The CR was built on the CS predicting the UCS, so when the bell rings and the food (UCS) never arrives, the prediction fails and the response dies out.
Operant Conditioning (Unit 3)
Extinction happens in operant conditioning too, just with a different trigger. In classical conditioning, extinction means CS without UCS. In operant conditioning, it means a behavior stops being reinforced, so the behavior fades. Same word, parallel logic, different mechanism. The exam loves testing whether you can tell which version a scenario describes.
Exposure Therapies (Unit 5)
Extinction is the engine behind exposure therapy. A phobia is a conditioned fear response, so therapists present the feared stimulus (CS) repeatedly without anything bad happening (no UCS) until the fear response extinguishes. This is the cleanest Unit 3 to Unit 5 bridge in the course.
Extinction shows up in multiple-choice questions as a scenario-identification task. You'll get a vignette, like a researcher who conditions dogs to salivate to a tone, then presents the tone without food until salivation stops, and you have to label which stage of conditioning is happening. Questions frequently chain extinction with spontaneous recovery, like a study where the tone returns after a one-week break and the response reappears. Know the full sequence: acquisition, extinction, spontaneous recovery.
No released FRQ has used "extinction" as the headline term, but it fits the AAQ and EBQ format perfectly. If a research summary describes a response declining when pairings stop, you should be able to name extinction, explain the mechanism (CS presented without UCS), and apply it to the data. The single most common point lost is saying extinction "erases" the learning. Spontaneous recovery is the evidence that it doesn't, and exam writers know exactly how to bait that mistake.
Extinction and spontaneous recovery are opposite moves in the same story. Extinction is the response fading because the CS keeps showing up without the UCS. Spontaneous recovery is that extinguished response suddenly reappearing after a rest period, with no new CS-UCS pairings. The trick is that spontaneous recovery proves extinction isn't forgetting. The original association is still stored, just suppressed. If a question describes a break in time followed by the response coming back, that's spontaneous recovery, not re-acquisition.
Extinction is the gradual weakening and disappearance of a conditioned response when the conditioned stimulus is repeatedly presented without the unconditioned stimulus.
Extinction does not erase the original learning; spontaneous recovery shows the association is still stored, because the response can reappear after a rest period.
Only the conditioned response extinguishes; unconditioned responses are reflexes and don't fade this way.
Extinction also occurs in operant conditioning, but there it means a behavior fades because reinforcement stops, not because a stimulus pairing breaks.
On the exam, identify extinction by its trigger in the scenario: the CS keeps appearing, the UCS never does, and the response declines over trials.
Exposure therapies for phobias work by deliberately running extinction, presenting the feared CS repeatedly with no bad outcome until the fear response fades.
Extinction is the gradual weakening and eventual disappearance of a conditioned response, which happens when the conditioned stimulus is repeatedly presented without the unconditioned stimulus. It's a core stage of classical conditioning in Topic 3.7 of Unit 3.
No. Extinction suppresses the conditioned response but doesn't delete the original CS-UCS association. Spontaneous recovery, where the response reappears after a rest period, is the standard evidence that the learning is still stored.
Extinction is the response fading while the CS is presented without the UCS. Spontaneous recovery is the extinguished response briefly returning after a break, with no new pairings. They're sequential stages, and exam scenarios often test both in one vignette.
The outcome is the same (a learned behavior fades) but the cause differs. In classical conditioning, extinction happens when the CS appears without the UCS. In operant conditioning, it happens when a behavior stops being reinforced.
In his research with dogs, Pavlov (1927) paired a bell with food until the bell alone triggered salivation, then rang the bell repeatedly without food. Salivation steadily decreased until it stopped, demonstrating extinction, and later returned after a rest, demonstrating spontaneous recovery.