Classical Conditioning Simulator
Run Pavlov's experiment yourself. Ring the bell, give food, and pair them until the bell alone makes the dog drool — a conditioned response forming in front of you. Then ring the bell on its own and watch extinction set in.
Press a button to begin.
Try this sequence:
- Ring the bell alone — the dog ignores it (neutral stimulus).
- Pair bell + food about 5–8 times — salivation each time (acquisition).
- Ring the bell alone again — it now triggers drool (conditioned response!).
- Keep ringing it alone — the response fades (extinction).
What Is Classical Conditioning?
Classical conditioning is learning by association: you come to link two stimuli so that one triggers a response that used to belong to the other. Ivan Pavlov discovered it by accident while studying dog digestion — the dogs started salivating at the sound of the lab assistant before any food appeared. The simulator above lets you recreate that exact result.
Salivating at food is automatic — no learning required. The learning is what makes a previously meaningless bell start to trigger the same drooling. That shift is the whole phenomenon.
The Five Terms: NS, US, UR, CS, CR
These five labels are the heart of every AP exam question on classical conditioning. Watch them appear live as you use the buttons above.
| Term | In the simulator |
|---|---|
| Neutral Stimulus (NS) | The bell before learning — it triggers nothing. |
| Unconditioned Stimulus (US) | The food — it naturally causes drooling. |
| Unconditioned Response (UR) | Salivation to the food — automatic, unlearned. |
| Conditioned Stimulus (CS) | The bell after pairing — it now means "food." |
| Conditioned Response (CR) | Salivation to the bell alone — learned. |
The bell is the same sound the whole time. What changes is what it means — that's why it has two names: NS before conditioning, CS after.
Acquisition and Extinction in AP Psychology (Unit 3)
In AP Psychology Unit 3: Development and Learning, you need both the vocabulary and the process. Acquisition is the building phase — pairing the bell with food strengthens the link, which you can watch on the conditioning-strength meter. Extinction is the fading phase — ring the bell with no food and the conditioned response weakens until it disappears.
Two more terms you can explore: leave the dog alone after extinction and the response may briefly return (spontaneous recovery), and a similar-sounding tone might also trigger drool (generalization). Once this clicks, see where you stand with the AP Psychology score calculator.
Classical Conditioning — FAQ
What is a real-life example of classical conditioning?
Feeling hungry when you hear a particular jingle, flinching at the dentist's drill, or a pet getting excited at the sound of the treat bag — all are bells that came to predict something and now trigger the response on their own.
How is classical conditioning different from operant conditioning?
Classical conditioning links two stimuli and works on automatic, involuntary responses like salivation. Operant conditioning links a behavior to its consequence (reward or punishment) and works on voluntary actions. This simulator covers the classical side.
Who discovered classical conditioning?
Ivan Pavlov, a Russian physiologist, while studying digestion in dogs in the early 1900s. John B. Watson later extended it to humans in the well-known "Little Albert" study.
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