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An Operant Intra-/Extra-dimensional Set-shift Task for Mice
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Published on: January 22, 2016

Acquired equivalence changes stimulus representations.

M Meeter1, D Shohamy, C E Myers

  • 1Dept. of Cognitive Psychology, Vrije Universiteit Amsterdam, Amsterdam, The Netherlands. m@meeter.nl

Journal of the Experimental Analysis of Behavior
|February 24, 2009
PubMed
Summary
This summary is machine-generated.

Acquired equivalence training increases stimulus generalization by linking dissimilar items to similar outcomes. This training influences memory coding, supporting the associative mediation view of how stimuli become more similar.

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Area of Science:

  • Cognitive Psychology
  • Learning and Memory

Background:

  • Acquired equivalence increases generalization between dissimilar stimuli linked to similar outcomes.
  • Proposed mechanisms include changes in stimulus representation or strategic inference.
  • The role of acquired equivalence in memory coding requires further investigation.

Purpose of the Study:

  • To investigate the influence of acquired equivalence training on episodic memory coding.
  • To differentiate between associative mediation and stimulus reweighting as explanations for acquired equivalence.
  • To test the strategic inference account of acquired equivalence.

Main Methods:

  • Acquired equivalence training was applied to drawings of faces.
  • A list learning paradigm paired equivalent faces with words.
  • Episodic memory tests assessed recognition of face-word pairings.

Main Results:

  • Participants showed increased confusion between equivalent faces during recognition tasks.
  • Results supported the associative mediation account over stimulus reweighting.
  • Acquired equivalence training demonstrably influences memory encoding.

Conclusions:

  • Acquired equivalence training alters memory representations by strengthening associations.
  • The findings align with associative mediation and exemplar theories of categorization.
  • This study provides evidence for the impact of prior learning on subsequent memory processes.