Operant conditioning: reinforcement and punishment
- Theory
Behavior is shaped by what follows it: consequences that help make it more frequent, consequences that hurt make it less frequent.
What it is
In operant (instrumental) conditioning a voluntary behavior becomes more or less likely according to its consequences. Thorndike called it the law of effect and Skinner studied it systematically. Reinforcement always increases a behavior and punishment always decreases it; «positive» means that something is added and «negative» that something is taken away.
Key facts
- Primary reinforcers have innate value (food, water, warmth, touch); secondary or conditioned reinforcers gain value by association (money, praise, tokens).
- Avoidance and escape behaviors are maintained by negative reinforcement: the relief that follows is the reward.
- Reinforcement works best when it is immediate and contingent on the behavior; delayed consequences shape behavior weakly.
- Chaining links several shaped steps into one sequence (dressing, hand hygiene steps).
The 2 × 2 of operant conditioning, with original examples
| Type | What happens | Effect on behavior | Example |
|---|---|---|---|
| Positive reinforcement | A pleasant stimulus is added | Increases | A child earns a sticker for every dry night |
| Negative reinforcement | An unpleasant stimulus is removed | Increases | A man with a phobia leaves the elevator and his anxiety drops, so he avoids elevators more |
| Positive punishment | An unpleasant stimulus is added | Decreases | A resident is reprimanded in front of the team for arriving late |
| Negative punishment | A pleasant stimulus is removed | Decreases | A teenager loses the use of the car after a speeding ticket |
| Extinction | The usual reinforcement no longer comes | Decreases (after a possible burst) | Staff stop answering a patient's call bell instantly for non-urgent requests and the calls first rise, then fall |
Clinical notes
- Substance use: euphoria is a positive reinforcer early on; later, relief of withdrawal and of negative emotion is a powerful negative reinforcer.
- Chronic pain: attention, rest and relief from duties that follow pain behaviors can reinforce them, independent of tissue damage.
- In gambling disorder, wins arrive unpredictably (variable ratio), which makes the behavior very resistant to extinction.
- Token economies, contingency management and moisture alarms with reward charts are operant techniques used in therapy.
Test yourself
Think of the answer, then tap the question to see it.
A patient with migraine learns that lying in a dark room makes the pain go away, and does it at every attack. What type of learning is this?
Negative reinforcement: an unpleasant stimulus (pain) is removed, so the behavior (lying in the dark) becomes more frequent.
Is negative reinforcement the same as punishment?
No. Any reinforcement increases a behavior; negative reinforcement does it by removing something unpleasant. Punishment decreases a behavior.
Parents take away a child's video game time after he hits his sister. What is this called?
Negative punishment: a pleasant stimulus is removed in order to decrease the behavior.
When reinforcement is withdrawn, a behavior sometimes gets worse before it fades. What is this phenomenon?
An extinction burst: a temporary increase in the frequency or intensity of the behavior when the expected reinforcement stops.
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Connections
Educational content on behavior and the clinical relationship; not a diagnostic or treatment guide and no substitute for assessment by a health professional. If you or someone near you is at risk, seek help now from an emergency service or a mental-health helpline.
Sources: Facets of Pavlovian and operant extinction (Behavioural Processes (PubMed Central), 2012); The neurobiology of addiction (Annals of the New York Academy of Sciences (PubMed Central), 2019); Contingency Management: Incentives for Sobriety (Alcohol Research & Health (PubMed Central), 1999).
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Representative model, for educational purposes only.