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Journal of the Experimental Analysis of Behavior logoLink to Journal of the Experimental Analysis of Behavior
. 1976 Nov;26(3):405–413. doi: 10.1901/jeab.1976.26-405

Fixed versus variable sequences of food and stimulus presentation in second-order schedules1

P K Corfield-Sumner, D E Blackman
PMCID: PMC1333531  PMID: 16811956

Abstract

Three pigeons were exposed to a second-order schedule in which the behavior specified by a fixed-interval component schedule was reinforced according to a ratio overall schedule. The completion of components not followed by food was signalled by a brief stimulus never paired with food. Food and the stimulus occurred in a random sequence or in fixed alternation, but the overall schedules (variable ratio 2 or fixed ratio 2) ensured that an equal number of food and brief-stimulus presentations occurred in each session. The control exerted by the food and by the brief stimulus was measured by overall response rates, mean pauses, frequency distributions of pauses, and response patterning across components. In general, the stimulus controlled patterns of behavior more similar to those controlled by food when food and the stimulus occurred in a random sequence than when they occurred in fixed alternation.

Keywords: second-order schedules, fixed-interval components, nonpaired brief stimuli, schedule control, conditioned reinforcement, omission effect, key peck, pigeons

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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