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Related Experiment Videos

Retraining of extinguished Pavlovian stimuli.

R A Rescorla1

  • 1Department of Psychology, University of Pennsylvania, 3815 Walnut Street, Philadelphia, Pennsylvania 19104, USA. rescorla@cattell.psych.upenn.edu

Journal of Experimental Psychology. Animal Behavior Processes
|April 12, 2001
PubMed
Summary

Reconditioning after extinction in rats does not erase previous learning. Instead, retraining strengthens original associations, suggesting new learning is superimposed on prior processes.

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Area of Science:

  • Behavioral Neuroscience
  • Learning and Memory
  • Animal Behavior

Background:

  • Extinction in Pavlovian conditioning is understood as a new inhibitory process, not unlearning.
  • Reconditioning, or retraining after extinction, is a common phenomenon in animal learning studies.
  • The precise mechanisms by which reconditioning restores responding remain incompletely understood.

Purpose of the Study:

  • To investigate the underlying mechanisms of reconditioning in restoring extinguished Pavlovian responses.
  • To determine if reconditioning erases the effects of extinction or modifies existing associative structures.
  • To examine the impact of retraining on spontaneous recovery and original associative strength.

Main Methods:

  • Five Pavlovian magazine approach experiments were conducted using rat subjects.

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  • Rats underwent extinction training followed by reconditioning (retraining).
  • Spontaneous recovery and associative strength were measured to assess learning modifications.

    • Main Results:

    • Retraining did not eliminate the spontaneous recovery characteristic of extinguished stimuli over time.
    • Evidence indicated that retraining after extinction enhanced the strength of the original associations.
    • The decremental process of extinction was not destroyed by subsequent retraining.

    Conclusions:

    • Reconditioning does not erase the effects of extinction; it appears to build upon it.
    • Retraining superimposes further associative learning onto the existing decremental process of extinction.
    • These findings support a model where both extinction and retraining involve associative modifications rather than unlearning.