Concurrent Behavior and Response-Reinforcer Contiguity
The effects of response-food and lick-food contiguity were separately assessed on a modified recycling conjunctive FT 30 s FR 1 schedule of food reinforcement. Initial exposure to the unmodified schedule, with water freely available, produced low rate responding that was confined to the end of each cycle, whereas licking occupied a large proportion of the postreinforcement period. When response-food contiguity was programmed on the modified schedule there was a substantial increase in overall response rate, accompanied by fixed-interval-like patterning; there was very little change in licking. After a return to baseline conditions lick-food contiguity was programmed for each animal. For those animals who showed an increase in the frequency of lick-food contiguity lever pressing decreased dramatically, but there was very little change in overall rate and distribution of licking. In the final condition, removal of the drink bottle produced a slight increase in responding and a decrease in pause duration. These findings demonstrate an interdependence between licking and lever pressing on interval schedules.
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