Abstract
The question of how temporal control of responding might be influenced by contingency changes in other contexts was investigated. Each of three pigeons first was exposed to a two-component multiple schedule in which a two-key free-operant psychophysical procedure operated in one component and a variable-interval schedule operated in the other component. The variable-interval schedule then was changed to extinction while the free-operant psychophysical procedure remained unchanged. Finally, the variable-interval schedule was reintroduced. Response rates on the left key and the estimated temporal threshold under the free-operant psychophysical procedure increased for each pigeon when the alternate component schedule was changed to extinction and then decreased again when the variable-interval schedule was reintroduced. The results suggest one way that temporal control is affected by its context, and may be interpreted through the direct effects of overall reinforcement rate on temporal control mechanisms or the disruptive effects of alternative sources of reinforcement on temporally controlled behavior.
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