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Related Experiment Videos

Chimpanzee responding during matching to sample: control by exclusion.

Michael J Beran1, David A Washburn

  • 1Georgia State University, USA. mjberan@yahoo.com

Journal of the Experimental Analysis of Behavior
|January 1, 2003
PubMed
Summary

Chimpanzees used exclusion to match undefined samples with correct lexigrams when incorrect options were known. However, they did not learn new symbol-object associations through this exclusion process.

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Area of Science:

  • Cognitive science
  • Animal behavior
  • Primate cognition

Background:

  • Matching-to-sample tasks assess associative learning and cognitive abilities.
  • Chimpanzees' capacity for symbolic representation and exclusion is key to understanding their learning.

Purpose of the Study:

  • To investigate chimpanzees' use of exclusion in a matching-to-sample task with defined and undefined stimuli.
  • To determine if chimpanzees learn new associations through exclusion.

Main Methods:

  • Three chimpanzees participated in computerized matching-to-sample tasks.
  • Stimuli included photographs as samples and lexigrams as comparisons.
  • Experiments varied the number of comparisons and the defined/undefined status of foils.

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Main Results:

  • Chimpanzees correctly matched undefined samples significantly above chance when foils were defined.
  • When presented with undefined samples, chimpanzees preferentially selected undefined comparisons, indicating exclusion.
  • Despite successful exclusion, chimpanzees did not form new sample-comparison associations.

Conclusions:

  • Chimpanzees utilize exclusion as a strategy to solve matching-to-sample problems with novel stimuli.
  • Exclusionary behavior in this context does not lead to the formation of new symbolic associations.