The behaviourist approach, including classical conditioning and Pavlov's research, operant conditioning, types of reinforcement and Skinner's research.

What this dot point is asking

AQA wants you to describe the behaviourist approach, including classical conditioning (Pavlov), operant conditioning, types of reinforcement and Skinner's research. The skill at A-level is not just defining the terms but using the precise stimulus-response vocabulary in the correct order and recognising the assumptions that sit behind the approach, because those assumptions are exactly what 8 and 16 mark evaluation questions ask you to weigh.

The assumptions that drive the approach

Behaviourism rests on a small set of testable assumptions that you should be able to name. First, only observable, measurable behaviour is the proper subject of a scientific psychology, so mental processes are dismissed as a private "black box" that cannot be studied objectively. Second, humans are born a blank slate (tabula rasa), so almost all behaviour is learned from the environment rather than innate. Third, the same basic laws of learning apply across species, which justifies studying rats and dogs and generalising to humans. These assumptions make behaviourism strongly environmentally deterministic (behaviour is caused by past conditioning, not free choice) and reductionist (complex behaviour is reduced to simple stimulus-response units). Knowing these three assumptions lets you anchor an evaluation, because every strength and weakness of the approach traces back to one of them.

Classical conditioning

Pavlov's procedure follows a fixed sequence you must be able to reproduce. Before conditioning, food (the unconditioned stimulus, UCS) automatically produces salivation (the unconditioned response, UCR), while the bell is a neutral stimulus (NS) producing no salivation. During conditioning, the bell is repeatedly presented just before the food, so the two become associated. After conditioning, the bell alone (now a conditioned stimulus, CS) produces salivation (the conditioned response, CR). Pavlov also documented features that show this is genuine learning rather than reflex: timing matters (the NS must come just before the UCS), extinction occurs if the CS is repeatedly presented without the UCS, spontaneous recovery can follow a rest period, and generalisation means similar stimuli (a bell of slightly different pitch) can also trigger the CR. These features are valuable in essays because they show the mechanism is lawful and predictable, supporting the claim that behaviourism is scientific.

Operant conditioning

Whereas classical conditioning explains involuntary, reflexive responses, operant conditioning explains voluntary behaviour through its consequences. Skinner placed a hungry rat in a controlled chamber (the Skinner box) containing a lever. When the rat pressed the lever and received a food pellet (positive reinforcement), the rate of lever-pressing rose. In a variant, a mild electric current ran across the floor and pressing the lever switched it off (negative reinforcement), which also raised lever-pressing because the rat learned to escape and then avoid the unpleasant stimulus. Crucially both forms of reinforcement increase behaviour; only punishment (adding an unpleasant consequence) decreases it. Skinner also studied schedules of reinforcement, finding that partial (intermittent) reinforcement, such as rewarding only some responses, produces behaviour more resistant to extinction than continuous reinforcement, which is why gambling is so persistent. The strength of his method is the high degree of control and the objective, quantifiable measure (rate of response), letting him establish clear causal relationships between consequence and behaviour.

Strengths, limitations and applications

The approach has real scientific credibility: its concepts are operationalised and tested under controlled conditions, giving it falsifiable, replicable findings. It also has practical value, underpinning token economies in prisons and psychiatric units (positive reinforcement of desirable behaviour) and systematic treatments for phobias. However, the reliance on animal studies invites the criticism that human behaviour, with its language and conscious reasoning, may not reduce to the same laws (the comparison with social learning theory and the cognitive approach is the obvious evaluative move here). The environmental determinism also has ethical and practical implications, removing the idea of personal responsibility, and ignoring the role of genes and biology that the biological approach emphasises.