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Learned irrelevance and response perseveration in a total change dimensional shift task.

J H R Maes1, J Vich, P A T M Eling

  • 1NICI/Biological Psychology, Radboud University Nijmegen, P.O. Box 9104, 6500 HE Nijmegen, The Netherlands. r.maes@nici.ru.nl

Brain and Cognition
|May 11, 2006
PubMed
Summary

Participants demonstrated a strong tendency to ignore previously irrelevant information, even when it became crucial after a task shift. This highlights the persistence of learned irrelevance in cognitive tasks.

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Area of Science:

  • Cognitive Psychology
  • Learning and Memory
  • Behavioral Neuroscience

Background:

  • Discrimination learning involves identifying relevant stimulus dimensions.
  • Learned irrelevance can persist even when prior stimulus-response associations are invalidated.

Purpose of the Study:

  • To investigate the persistence of learned irrelevance in a total change discrimination task.
  • To examine error patterns following a shift in the relevant stimulus dimension.

Main Methods:

  • Thirty-six healthy participants completed a discrimination learning task.
  • A 'total change' design was employed where all post-shift stimuli were novel.
  • Three conditions assessed errors related to perseveration, continued ignoring, or both.

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Main Results:

  • Participants in the perseveration condition made fewer errors post-shift compared to other conditions.
  • Conditions involving continued ignoring of the former irrelevant dimension did not differ in error rates.

Conclusions:

  • The learned irrelevance mechanism shows a strong predominance, even when direct learning transfer is impossible.
  • Cognitive flexibility may be influenced by the established irrelevance of certain stimulus dimensions.