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Isolated effects of number of acquisition trials on extinction of rat conditioned approach behavior. | LitMetric

AI Article Synopsis

  • A series of four experiments with conditioned rats investigated how the number of acquisition trials impacts the extinction of conditioned responses while keeping acquisition sessions and total time constant.
  • Results showed that more trials per session generally led to more extinction responding, but with variations depending on the number of trials, echoing the overtraining extinction effect (OEE).
  • The findings highlight a procedural asymmetry in extinction persistence, with within-subject trials behaving differently from between-subject trials, and are discussed through associative and information processing perspectives.

Article Abstract

Four conditioned approach experiments with rats assessed for effects of number of acquisition trials on extinction of conditioned responding, when number of acquisition sessions and total acquisition time were held constant. In Experiment 1, 32 trials per acquisition session led to more extinction responding than did 1 or 2 trials per session but less than did 4 trials per session. In Experiment 2, 2 trials per acquisition session led to more spontaneous recovery than did 32 trials per session. These latter findings are reminiscent of the overtraining extinction effect (OEE). Experiment 3 attempted to reduce the OEE with a preconditioning phase of partial reinforcement. Experiment 4 attempted to reduce the beneficial within-subject effects of increasing the number of acquisition trials on extinction observed by Gottlieb and Rescorla (2010) by extinguishing stimuli in different sessions. Overall, results suggest a procedural asymmetry: between-subject, increasing the number of trials between any pair of trials does not lead to greater persistence of responding during extinction; within-subject, it does. Results are discussed from an associative perspective, with a focus on explanations involving either frustration or comparator mechanisms, and from an information processing perspective, with a focus on Rate Estimation Theory.

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Source
http://dx.doi.org/10.1016/j.beproc.2012.03.010DOI Listing

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