EDF5684 Chap.3 Positive Reinforcement
Positive Reinforcement
Positive reinforcement occurs when a stimulus is presented after a response and that response becomes more likely in the future. This chapter treats reinforcement as a measured process rather than an object, separating automatic from socially mediated consequences and unconditioned from conditioned reinforcers.
Premack and response-deprivation analyses show why access to behaviour can function as reinforcement under particular histories and access conditions.
What this chapter covers
- 01
Positive reinforcement as stimulus presentation plus response increase
- 02
Automaticity and functional verification of reinforcement
- 03
Automatic and socially mediated reinforcement
- 04
Unconditioned, conditioned and generalised reinforcers
- 05
The Premack principle and high-probability behaviour
- 06
Response deprivation and current access conditions
Worked example · free
Verify an independent request contingency
- +1Define the target as independently handing over the water symbol.
- +1Identify the drink as a stimulus presented contingently after that response.
- +1Require an increase in later independent requests before calling the drink a reinforcer.
- +1Record prompted and independent requests separately so prompting does not imitate improvement.
- +1Revise the arrangement if the target response does not increase under comparable conditions.
Key terms
- Positive Reinforcement
- Presentation of a stimulus after a response that increases future responding.
- Automatic Reinforcement
- Reinforcement produced directly by the response without social delivery by another person.
- Conditioned Reinforcer
- A stimulus that acquires reinforcing effectiveness through a learning history.
- Generalised Reinforcer
- A conditioned reinforcer paired with multiple other reinforcers across varied conditions.
- Premack Principle
- Using access to a higher-probability activity to reinforce a lower-probability response.
Positive Reinforcement FAQ
Why is a reward not automatically a reinforcer?
Reward is an everyday label based on intention or appearance. A reinforcer is defined functionally: it follows a response and increases that response in the future. If the target response stays stable or decreases, the offered item did not function as positive reinforcement in that arrangement.
How do automatic and social reinforcement differ?
Automatic reinforcement is produced directly by the response itself, such as a sensory change generated by the action. Socially mediated reinforcement depends on another person delivering or arranging the consequence. Either source can involve learned or unlearned reinforcers.
How does response deprivation extend Premack?
Premack uses a higher-probability activity to reinforce a lower-probability response. Response deprivation emphasises current access: restricting an activity below its baseline can make access reinforcing even when that activity was not initially the higher-probability option.
How should reinforcement be checked during teaching?
Choose a clearly defined independent response and a plausible consequence, arrange prompt delivery only when appropriate and record later responding under comparable opportunities. Keep prompted and independent responses separate so assistance does not inflate apparent learning. Preference can guide initial selection, but only an observed increase demonstrates reinforcing function.
If performance does not improve, review timing, contingency, response effort, access elsewhere and current motivating conditions one at a time. Once performance is stable, test new settings and thin gradually toward practical, naturally available consequences while continuing to monitor accuracy.
Assessment move
For every example, write response, added stimulus and later response trend on separate lines. Then classify whether the consequence is produced automatically or through another person, and whether its effectiveness depends on a learning history. Practise Premack and response deprivation with baseline activity rates rather than favourite-item lists.
In project planning, define independent and prompted responses separately and decide in advance what data would show that the arranged consequence actually functions as reinforcement. Extend the routine by separating preference assessment from reinforcer verification.
For a proposed consequence, record why it is plausible, how quickly it follows the response, whether delivery depends on the response and what comparison will reveal an increase. Imagine three null results and diagnose them without calling the learner unmotivated: the consequence may be delayed, freely available elsewhere, too small, paired with excessive effort or simply ineffective.
Practise revising one feature while holding the others constant. For Premack problems, write baseline rates for both activities before deciding which can reinforce the other. For response-deprivation problems, compare access under the contingency with baseline access and explain why a restricted lower-probability activity could sometimes become effective. Do not use a favourite-item shortcut.
Add a generalisation check to every design. Ask whether the response occurs with new materials, people and settings, and whether natural consequences can eventually support it. Plan gradual schedule thinning only after independent performance is stable.
End with a data audit: distinguish prompted from independent responses, use a consistent opportunity denominator, graph the relevant trend and note any competing changes in instruction or motivation. The aim is to demonstrate a functional relation, not to document that an attractive event was offered after correct behaviour.
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