PSYC10003 · Mind, Brain and Behaviour 1
Classical Conditioning: Pavlov and Watson
Week 2 opens the Learning & Cognition strand with associative learning through classical conditioning: Pavlov's discovery, the unconditioned/conditioned stimulus and response distinctions, and the processes of acquisition, extinction, spontaneous recovery, generalisation and discrimination. It grounds Watson's behaviourism and the Little Albert fear-conditioning study as the historical foundation of learning theory. The signature exam item — worth easy marks if drilled — asks you to label the UCS, UCR, CS and CR in a novel scenario, so this is a high-yield chapter within the 25% Learning & Cognition block.
What this chapter covers
- 01Non-associative learning: habituation (diminished response) vs sensitisation (heightened response)
- 02Classical conditioning as learning a predictive CS→UCS relationship; a learned reflex
- 03The four terms: NS (neutral), UCS (unconditioned stimulus), UCR (unconditioned response), CS, CR
- 04The three phases: before conditioning; acquisition (NS presented just before UCS, repeated); after conditioning
- 05Acquisition curve: CR strength rises then plateaus over trials
- 06Stimulus generalisation vs discrimination
- 07Extinction (CS alone → CR declines), spontaneous recovery, rapid re-acquisition; the retrieval model of extinction
- 08Watson & behaviourism; the Little Albert study (white rat + loud sound → conditioned fear, generalised)
Mapping a novel scenario onto the conditioning terms
- +1Find the natural (unlearned) reflex first. The sharp mint is the UCS; the wince it naturally produces is the UCR. This pairing is innate and does not have to be learned.
- +1Identify the initially neutral stimulus. The start-up chime begins as the NS — before training it produces no wince.
- +1After repeated NS-then-UCS pairings (the acquisition phase), the chime becomes the CS and the wince it now triggers on its own is the CR. So: NS/CS = chime, UCS = mint, UCR = wince to the mint, CR = wince to the chime alone.
- +1Presenting the CS (chime) repeatedly with no UCS (mint) is extinction: the CR (the wince to the chime) gradually declines. Note it is not erased — after a rest, spontaneous recovery can return a weaker wince.
Key terms
- Unconditioned stimulus (UCS)
- A biologically significant stimulus that naturally, without learning, triggers a reflex response (e.g. food, a loud sound).
- Conditioned stimulus (CS)
- A formerly neutral stimulus that, after repeated pairing with the UCS, comes to elicit the response on its own.
- Acquisition
- The phase in which the neutral stimulus is repeatedly presented just before the UCS, so it becomes a CS; CR strength rises then plateaus across trials.
- Extinction
- Repeated presentation of the CS alone (no UCS) causing the CR to decline. It does not erase the original association — a new inhibitory, context-bound association is layered on top (the retrieval model).
- Spontaneous recovery
- The return of a (weaker) CR after apparent extinction plus a rest interval, without any re-pairing of the CS and UCS.
- Stimulus generalisation
- The transfer of a CR to stimuli similar to the CS, with response strength falling as similarity decreases; the complement of stimulus discrimination.
Classical Conditioning: Pavlov and Watson FAQ
What is the difference between the UCR and the CR?
They are often the same behaviour but triggered by different stimuli. The UCR is the innate, unlearned reflex to the UCS (salivating to food); the CR is the learned response to the CS alone (salivating to a bell). If a stimulus produces the response without any prior learning, it is unconditioned.
Does extinction erase the original learning?
No. Extinction adds a new, inhibitory CS-no-UCS association that is tied to the extinction context; the original excitatory association survives underneath. That is why spontaneous recovery, rapid re-acquisition and renewal (return of the response in a new context) all occur — a favourite exam distinction.
Why is the Little Albert study important?
It was the first demonstration of fear conditioning in a human: pairing a white rat with a sudden loud sound produced a conditioned fear response to the rat, which generalised to other furry objects. It grounds Watson's behaviourism and shows emotional responses can be classically conditioned — clinically relevant to phobias.
How is this examined?
Almost always as a scenario item: you are given an everyday situation and asked to identify the NS/UCS/UCR/CS/CR or to name the process (acquisition, extinction, generalisation, spontaneous recovery). The findings of Pavlov's and Watson's work are tested, not the dates.
What is the difference between generalisation and discrimination?
Generalisation is when the CR transfers to stimuli resembling the CS (a similar-sounding bell also triggers salivation). Discrimination is training the CR to occur only to the specific CS — reinforce the target CS with the UCS while presenting similar stimuli without it.
Exam move
Make the four-term labelling automatic: for any scenario, find the innate reflex (UCS→UCR) first, then the cue that acquires the response (NS→CS→CR). Draw the acquisition/extinction/spontaneous-recovery curve from memory and be able to say why each segment moves as it does. Keep the post-acquisition phenomena — extinction, spontaneous recovery, rapid re-acquisition, renewal — straight by remembering the retrieval model: extinction inhibits but does not erase, and the inhibition is context-bound. Because this is a scenario-heavy corner of the 25% Learning & Cognition block, drill with many fresh cover stories rather than re-reading the definitions. Confirm exam details on Canvas.
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