Abstract
Pigeons performed on second-order schedules of reinforcement consisting of four fixed-interval components. Only the terminal component ended with food. Performance was studied both when a brief stimulus followed the completion of each of the first three fixed intervals (brief-stimulus schedule) and when the stimulus was omitted (tandem schedule). Variations in the temporal contiguity of the last presentation of the stimulus and the presentation of food indicated that the shorter the delay, the greater was the enhancement of rate of responding in comparison with tandem performance. A positively accelerated pattern of responding within fixed-interval components was a function of the contiguity of the brief stimulus and reinforcement; this pattern was absent for all tandem-schedule performance.
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Selected References
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