Behaviourism · 1957
Schedules of reinforcement
It is not reinforcement that shapes behaviour: it is how reinforcement is distributed in time, and the uncertainty involved, that makes behaviour persistent.
The study of schedules of reinforcement analyses how different temporal and quantitative relationships between responses and consequences — ratio or interval, fixed or variable — generate characteristic patterns of behaviour, such as high and stable response rates, post-reinforcement pauses or greater resistance to extinction. Ferster and Skinner demonstrate that behaviour depends not only on the presence of reinforcement, but on its scheduling, establishing functional laws that explain the persistence, regularity and vulnerability of operant behaviour in natural and experimental contexts.
Core ideas
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Behaviour depends on how reinforcement is scheduled, not only on its presence
Ferster and Skinner show that reinforcing a behaviour is not enough: the temporal and quantitative relationship between response and consequence determines specific patterns of behaviour. The scheduling of reinforcement is a critical variable that explains differences in response rate, regularity and behavioural persistence beyond simple occasional reinforcement. Reference: Ferster & Skinner (1957), *Schedules of Reinforcement*.
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Different schedules generate predictable response patterns
Each type of reinforcement schedule produces characteristic behavioural configurations — post-reinforcement pauses, progressive accelerations or stable rates — that can be anticipated and described functionally. These patterns reflect not traits of the organism, but the objective structure of the contingencies. Reference: Ferster & Skinner (1957), *Schedules of Reinforcement*.
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Resistance to extinction depends on the history of scheduling
The persistence of behaviour when reinforcement is withdrawn is not uniform, but a direct function of the schedule under which it was acquired. Variable schedules produce greater resistance to extinction than fixed ones, demonstrating that behavioural vulnerability is determined by previous contingencies and not by willpower. Reference: Ferster & Skinner (1957), *Schedules of Reinforcement*.
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Time can control behaviour independently of the number of responses
Interval schedules reveal that behaviour can be regulated by temporal variables, generating patterns such as scalloping under fixed intervals. This demonstrates that response rate depends not solely on the effort emitted, but on the temporal control exerted by the scheduling of reinforcement. Reference: Ferster & Skinner (1957), *Schedules of Reinforcement*.
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Behavioural variability and stability are products of scheduling
The regularity or variability of behaviour emerges from the structure of the reinforcement schedule and not from fluctuating internal states. Variable schedules generate sustained stability, whereas fixed schedules produce predictable oscillations, demonstrating the explanatory power of contingencies. Reference: Ferster & Skinner (1957), *Schedules of Reinforcement*.
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Behaviour adjusts rapidly to changes in contingencies
Transitions between different reinforcement schedules produce immediate changes in the rate and pattern of response, showing the high sensitivity of behaviour to the structure of the environment. This rapid adjustment reinforces the thesis that behavioural control resides in contingencies and not in internal deliberative processes. Reference: Ferster & Skinner (1957), *Schedules of Reinforcement*.
Influences
- Operant conditioning
- Experimental psychology
- Objectivist empiricism / Logical positivism
Key references
- Ferster, C. B., & Skinner, B. F. (1957). Schedules of Reinforcement.