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| Relapse |
| Monday, September 30, 2019 |
| 2:00 PM–2:50 PM |
| Stockholm Waterfront Congress Centre, Level 2, C4 |
| Area: EAB |
| Instruction Level: Advanced |
| Chair: Josele Abreu Rodrigues (Universidade de Brasilia) |
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| Relapse of Behavioral Variation |
| Domain: Basic Research |
| JOSELE ABREU RODRIGUES (Universidade de Brasília), Gabriela Chiaparini (Universidade de Brasília) |
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| Abstract: The present study investigated relapse of behavioral variation. In the Training Phase (context A), rats were exposed to the multiple Lag 10 Yoke (Experiment 1) and to the multiple Lag 10 Lag 1-3 (Experiment 2) schedules. With Lag 10, to be reinforced, a four-response sequence had to differ from the previous 10 sequences; with Yoke, any sequence could generate reinforcers; and with Lag 1-3, reinforcers were contingent to sequences that were equal to one of the three previous sequences, and that differ from the last one. Reinforcers probability was equated between components. In the Elimination Phase (context B), the multiple Rep 3 Rep 3 schedule was in effect such that a sequence was reinforced if it was equal to one of the three previous sequences. In the Test Phase (context A), the repetition contingency was eliminated, and two response-independent reinforcers were delivered in each component. In both experiments, relapse of recurrence time, a measure of sequence variation, was observed mainly with the “Lag 10” component, despite of the requirement or not of variation in the other component. These results show that variation, as other operant dimensions of behavior, may undergone relapse. |
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| The Effects of the Cost of Responding on Relapse of Response Sequences |
| Domain: Basic Research |
| JOSELE ABREU-RODRIGUES (Universidade de Brasília), João Gabriel de Oliveira (Universidade de Brasília) |
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| Abstract: Relapse is the reappearing of responding after extinction. The present study used a combination of two experimental models of relapse (renewal and reinstatement) to evaluate the effects of response cost (switching between operanda) on the reappearance of response sequences. Renewal was evaluated by changing the experimental context, and reinstatement by delivering response-independent reinforcers. Four rats were exposed, in the Training Phase (context A), to a multiple schedule with two components. In the 1-S component, reinforcers were contingent to five-response sequences with one switch between levers; in the 3-S component, only sequences with three switches were reinforced. In the Elimination Phase (context B), a multiple Ext Ext schedule operated such that no reinforcers were delivered in both components. In the Test Phase (context A), the multiple Ext Ext schedule remained in effect, but two response-independent reinforcers were delivered in each component. Relapse was observed for all animals in both components. However, the magnitude of relapse was higher for three-switch sequences (3-S component) than for one-switch sequences (1-S component) for three rats; for the remaining rat, there was no differential relapse between components. Unexpectedly, sequences with higher cost showed greater relapse. The causes of this effect have not yet been identified. |
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