Acquisition of preference in concurrent chains: comparing linear-operator and memory-representational models |
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Authors: | Grace Randolph C |
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Affiliation: | Department of Psychology, University of Canterbury, Private Bag 4800, Christchurch, New Zealand. r.grace@psyc.canterbury.ac.nz |
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Abstract: | Two experiments were conducted to test predictions of 2 models for acquisition of preference in concurrent chains. Pigeons were trained with pairs of fixed-interval and variable-interval terminal-link schedules in a successive-reversal design. Results showed that acquisition rate was faster when fixed-interval schedules preceded and when variable-interval schedules followed the reversal and was approximately constant when the same pair of schedules was used. These results were predicted by both linear-operator and memory-representational models. However, only the linear-operator model predicted effects of schedule duration. Overall, these results demonstrated that a simple linear-operator model can account for the major features of preference acquisition in concurrent chains and suggest that choice in transition and steady state may provide convergent validation of a single delay-discounting function. |
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