Pavlov's classical conditioning procedure
1. The dog is given food as usual (unconditioned stimulus)
2. The dog salivates when it sees and smells the food (unconditioned response)
3. A bell is sounded (neutral stimulus) every time the dog is given food (unconditioned stimulus)
4. A bell is sounded every time the food is presented (the pairing of neutral and unconditioned stimuli)
5. After repeated pairings the dog salivates when it hears the bell (the bell has become the conditioned stimulus and the dog salivating to the bell has become the conditioned response)
6. When Pavlov stopped pairing the bell and the food he found that the conditioned response decreased and gradually disappeared (known as 'extinction')