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Extinction Training During the Reconsolidation Window Prevents Recovery of Fear
11:17

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Published on: August 24, 2012

Extinction context as a conditioned inhibitor.

Cody W Polack1, Mario A Laborda, Ralph R Miller

  • 1Department of Psychology, State University of New York at Binghamton, Binghamton, NY 13902-6000, USA.

Learning & Behavior
|July 26, 2011
PubMed
Summary
This summary is machine-generated.

Extinction contexts can become conditioned inhibitors in rats, but trial spacing during extinction matters. Massed extinction trials promote inhibition more effectively than spaced trials, particularly for summation test performance.

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Area of Science:

  • Behavioral neuroscience
  • Learning and memory
  • Conditioning and inhibition

Background:

  • Understanding how contexts acquire inhibitory properties is crucial for explaining learned fear and avoidance behaviors.
  • Previous research suggests extinction can reduce conditioned excitation, but the inhibitory potential of the extinction context itself requires further investigation.

Purpose of the Study:

  • To determine if a context, following the extinction of a specific conditioned stimulus (CS), can function as a conditioned inhibitor.
  • To investigate the influence of extinction trial spacing (massed vs. spaced) on the development of contextual inhibition.

Main Methods:

  • Two lick suppression experiments were conducted using rats.
  • Rats were exposed to extinction trials of a punctate excitor within a specific context.
  • Summation and retardation tests were employed to assess contextual inhibition.
  • Extinction trial spacing was manipulated (massed vs. spaced) across experiments.

Main Results:

  • Contextual inhibition was observed with both massed and spaced extinction trials.
  • Spaced extinction trials reduced measurable inhibition on the summation test but not the retardation test.
  • Experiment 2 confirmed that contextual inhibition was evident only after massed extinction trials, controlling for latent inhibition effects.

Conclusions:

  • An extinction context can indeed become a conditioned inhibitor.
  • Massed extinction trials appear more effective than spaced trials in establishing contextual inhibition, particularly when assessed by summation.
  • These findings highlight the importance of extinction parameters in shaping learned inhibitory associations.