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Related Experiment Videos

Renewal after overexpectation.

Robert A Rescorla1

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

Learning & Behavior
|June 9, 2007
PubMed
Summary
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Spontaneous recovery from overexpectation.

Learning & behavior·2006

Rats showed reduced responses to individual stimuli after they were presented together and reinforced. However, responses renewed in a different context, suggesting extinction and overexpectation decrements share a common mechanism.

Area of Science:

  • Behavioral psychology
  • Animal learning

Background:

  • Conditioned stimuli can elicit responses.
  • Overexpectation and extinction can reduce responding.

Purpose of the Study:

  • Investigate the decrement in responding caused by reinforcing a compound of two previously conditioned stimuli.
  • Explore the renewal effect in overexpectation and extinction contexts.

Main Methods:

  • Four magazine approach experiments were conducted with rats.
  • Rats were exposed to compound presentations of previously conditioned stimuli.
  • Testing occurred in both original and alternative contexts.

Main Results:

  • Compound presentation led to an overexpectation decrement in responding to individual stimuli.

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  • Testing in an alternative context renewed the initial responding to individual stimuli.
  • This renewal mirrors effects seen after nonreinforcement-induced decrement.

    • Conclusions:

    • The decrement observed in extinction and overexpectation may stem from the same underlying mechanism.
    • Context plays a crucial role in the renewal of conditioned responding.