Explain classical conditioning, including the key processes and stimuli, and apply it to examples such as Pavlov's dogs and Little Albert

What this dot point is asking

SCSA expects you to use the conditioning vocabulary precisely, label each element in a worked example, and describe the processes that govern how a conditioned response is learned, lost and recovered. This dot point rewards accuracy of terminology above all.

The elements of classical conditioning

Ivan Pavlov discovered classical conditioning while studying salivation in dogs. He noticed the dogs salivated before food arrived, simply on hearing the footsteps of the assistant who fed them.

The five elements you must name precisely are:

• Unconditioned stimulus (UCS): a stimulus that naturally and automatically triggers a response, such as food.
• Unconditioned response (UCR): the automatic, reflexive response to the UCS, such as salivation to food.
• Neutral stimulus (NS): a stimulus that produces no relevant response before conditioning, such as a bell.
• Conditioned stimulus (CS): the previously neutral stimulus after it has been paired with the UCS, such as the bell after learning.
• Conditioned response (CR): the learned response to the conditioned stimulus alone, such as salivation to the bell.

Learning occurs when the NS is repeatedly presented just before the UCS. After enough pairings, the NS becomes a CS and produces the CR by itself.

The key processes

• Acquisition is the initial stage in which the CS-CR link is formed through repeated pairing. Conditioning is fastest when the NS appears shortly before the UCS.
• Extinction is the gradual weakening and disappearance of the CR when the CS is presented repeatedly without the UCS.
• Spontaneous recovery is the reappearance of a previously extinguished CR after a rest period, showing the link is suppressed rather than erased.
• Stimulus generalisation is responding with the CR to stimuli similar to the CS (a different-pitched bell).
• Stimulus discrimination is learning to respond only to the specific CS and not to similar stimuli.

The Little Albert study

John Watson and Rosalie Rayner showed that humans can be classically conditioned. They presented an 11-month-old infant, Little Albert, with a white rat (NS), which he did not fear. They then paired the rat with a loud, frightening noise (UCS) that naturally caused fear and crying (UCR).

After several pairings, Albert cried and showed fear at the sight of the rat alone. The rat had become a CS producing a conditioned fear response. Albert also showed stimulus generalisation, becoming fearful of other white furry objects such as a rabbit and a fur coat.

Why classical conditioning matters

Classical conditioning explains involuntary, reflexive and emotional responses: phobias, taste aversions, advertising that pairs products with pleasant images, and anxiety triggers. Therapies such as systematic desensitisation use the same principles in reverse to extinguish unwanted conditioned fears.