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Operant conditioning: reinforcement and punishment

Edexcel IAL Psychology · WPS02 Biological Psychology, Learning Theories and Development

Operant conditioning is learning from the consequences of behaviour. Behaviour that is reinforced is repeated; behaviour that is punished becomes less likely (spec 4.1.2).

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Reinforcement

Reinforcement always increases the behaviour.

Positive reinforcement: something pleasant is added (praise, money, sweets). A student is praised for handing in homework and does it again.
Negative reinforcement: something unpleasant is removed or avoided. A person takes a painkiller and the headache goes, so they take painkillers again; a student avoids a feared lesson and feels relief.

Negative reinforcement is not punishment: examiners report this is a common error.

Punishment

Punishment always decreases the behaviour.

Positive punishment: something unpleasant is added (a telling-off, a fine, extra chores).
Negative punishment: something pleasant is taken away (losing phone time, being grounded).

Positive and negative mean added and taken away, not good and bad.

	Something added	Something taken away
Behaviour increases	Positive reinforcement	Negative reinforcement
Behaviour decreases	Positive punishment	Negative punishment

Primary and secondary reinforcers

Primary reinforcers satisfy a biological need without learning: food, water, warmth.
Secondary reinforcers have no value in themselves but are learned through association with primary reinforcers: money, tokens, praise, grades. (A clicker paired with food in animal training is a conditioned, secondary reinforcer.)

Skinner studied operant conditioning with animals in a Skinner box, where pressing a lever or pecking a key could deliver food.

Evaluation

Strength: controlled, objective animal experiments; behaviour can be measured precisely.
Strength: many applications, such as token economies and classroom behaviour management.
Weakness: generalising from rats and pigeons to humans is limited.
Weakness: ignores thinking and observational learning (social learning theory shows learning without direct reinforcement).
Weakness: punishment may only suppress behaviour and can cause fear or aggression.

Worked example

A teenager's parents stop nagging when she tidies her room, and she tidies it more often. Which type of conditioning is this?

The behaviour (tidying) increases, so it is reinforcement.
Something unpleasant (nagging) is removed.
Unpleasant removed + behaviour increases = negative reinforcement.

Answer: Negative reinforcement.

Key idea: Reinforcement increases behaviour, punishment decreases it. Positive = add, negative = take away. Primary reinforcers meet biological needs; secondary ones are learned (money, praise).

Check yourself

A child gets a sticker for reading and reads more. This is
- negative reinforcement
- positive punishment
- negative punishment
- positive reinforcement
Show answer
positive reinforcement. Something pleasant added; behaviour increases.
A person leaves a noisy room to escape the noise and does this again next time. This is
- positive reinforcement
- negative reinforcement
- negative punishment
- positive punishment
Show answer
negative reinforcement. Escaping something unpleasant strengthens the behaviour.
A teenager loses their phone for a week after missing curfew and misses curfew less. This is
- positive punishment
- negative reinforcement
- positive reinforcement
- negative punishment
Show answer
negative punishment. Something pleasant is taken away; behaviour decreases.
A driver gets a fine for speeding and speeds less. This is
- positive punishment
- negative punishment
- negative reinforcement
- positive reinforcement
Show answer
positive punishment. An unpleasant consequence (the fine) is given; behaviour decreases.
Which is a primary reinforcer?
- Money
- A gold star
- Food for a hungry animal
- Praise from a teacher
Show answer
Food for a hungry animal. Food meets a biological need without learning.
Why is money a secondary reinforcer?
- Its value is learned through association with primary reinforcers
- It satisfies a biological need
- It removes something unpleasant
- It is always given on a fixed schedule
Show answer
Its value is learned through association with primary reinforcers. Money is valuable because it buys primary reinforcers.
Explain the difference between negative reinforcement and punishment.
Show answer
Negative reinforcement increases a behaviour by removing something unpleasant, whereas punishment decreases a behaviour by adding something unpleasant or taking away something pleasant.. One increases behaviour, the other decreases it.

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Last updated 8 November 2026. Spotted a mistake? Tell us.