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# Schedules of reinforcement

- Concept

How often a behavior is rewarded decides how fast it is learned and how hard it is to stop: unpredictable rewards make the most stubborn habits.

Updated Nov 5, 2026

## Key points

- Continuous reinforcement: fastest acquisition, fastest extinction.
- Variable ratio (rewards after an unpredictable number of responses): high, steady response rate and the MOST resistant to extinction; this is the schedule of slot machines and gambling.
- Fixed ratio (every n responses): high rate with a pause after each reward, as in piecework pay.
- Fixed interval (first response after a set time): scalloped pattern, with little activity after the reward and a rush just before the next one; the weakest and quickest to extinguish.
- Variable interval (first response after unpredictable times): moderate, steady rate, as when checking for messages or studying for pop quizzes.
- Partial reinforcement extinction effect: behavior learned on intermittent reinforcement lasts longer once rewards stop.

## What it is

A schedule of reinforcement is the rule that decides which responses are reinforced. In continuous reinforcement every correct response is rewarded, which teaches fastest but extinguishes fastest. In partial (intermittent) reinforcement only some responses are rewarded, according to a number of responses (ratio) or a time interval (interval), fixed or variable. Intermittent schedules make behavior more persistent.

## The four intermittent schedules, with original examples

| Schedule | Reward comes after | Response pattern | Resistance to extinction | Example |
| --- | --- | --- | --- | --- |
| Fixed ratio | A set number of responses | High, with a pause after each reward | Low to moderate | A pharmacy technician paid per hundred prescriptions filled |
| [Variable ratio](https://durgical.com/en/conditions/gambling-disorder/) | An unpredictable number of responses | High and steady, no pauses | Highest | Lottery scratch cards and slot machines |
| Fixed interval | The first response after a set time | Scalloped: rises just before the expected time | Lowest | A student who only studies in the days before a scheduled monthly exam |
| Variable interval | The first response after an unpredictable time | Moderate and steady | High | A resident who checks the lab system again and again for a pending result |

## Clinical notes

- Gambling disorder and many digital products (feeds, loot boxes) rely on variable-ratio rewards, which explains their persistence despite losses.
- Inconsistent limit setting reinforces tantrums on a variable schedule: a parent who gives in only sometimes makes the tantrums harder to extinguish.
- To teach a new health behavior, therapy usually starts with continuous reinforcement and then thins it to an intermittent schedule so the behavior lasts.

## Memory aid

Variable ratio is the Vegas Rule: you never know which pull will win, so you never stop pulling.

## Test yourself

Think of the answer, then tap the question to see it.

## Which schedule of reinforcement produces the behavior most resistant to extinction?

Variable ratio, in which the reward comes after an unpredictable number of responses, as in slot machines.

## A worker is paid for every 20 boxes assembled and rests briefly after each payment. Which schedule is this?

Fixed ratio: a reward after a set number of responses, with a characteristic pause after each reward.

## Why does a behavior learned with continuous reinforcement disappear quickly when the reward stops?

Because the change from ‘always rewarded’ to ‘never rewarded’ is easy to detect, while after intermittent reinforcement the absence of reward looks like an ordinary run of bad luck.

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## Connections

## Related 4

- [Operant conditioning: reinforcement and punishment](https://durgical.com/en/behavioral-science/operant-conditioning-reinforcement-and-punishment/)
- [Habituation, extinction, learned helplessness and modelling](https://durgical.com/en/behavioral-science/habituation-extinction-learned-helplessness-and-modelling/)
- [Behavior therapy: exposure, desensitization, token economy and more](https://durgical.com/en/behavioral-science/behavior-therapy-exposure-desensitization-token-economy-and-more/)
- [Addiction concepts: reward, tolerance, dependence and withdrawal](https://durgical.com/en/behavioral-science/addiction-concepts-reward-tolerance-dependence-and-withdrawal/)

## Related conditions 1

- [Gambling disorder](https://durgical.com/en/conditions/gambling-disorder/)

[← All of behavioral science](https://durgical.com/en/behavioral-science/)

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: [Pathological gambling and the loss of willpower: a neurocognitive perspective](https://pmc.ncbi.nlm.nih.gov/articles/PMC3960021/) (Socioaffective Neuroscience & Psychology (PubMed Central), 2013); [Contingency Management: Incentives for Sobriety](https://pmc.ncbi.nlm.nih.gov/articles/PMC6760431/) (Alcohol Research & Health (PubMed Central), 1999).

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Representative model, for educational purposes only.

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