Skinnerian “Schedules of Reinforcement” [bottom of page 12 of handout]
(Ferster and Skinner, 1957)
Continuous Reinforcement (=CRF; =FR1)
A reward is given after every response.
Fixed Ratio (FR)
A reward is given after every n responses (e.g. 10)
Variable Ratio (VR)
A reward is given after every n responses (e.g. 10) on average, but the exact number of responses is unpredictable.
Fixed Interval (FI)
A reward is available for just one response, but only after a fixed time (e.g. one minute) has elapsed since the last reward.
Variable Interval (VI)
A reward is available for just one response, but only after an unpredictable amount of time has elapsed (n minutes on average) since the last reward.
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