Same–different categorization in rats

  1. John H. Freeman
  1. The University of Iowa, Iowa City, Iowa 52242, USA

    Abstract

    Same–different categorization is a fundamental feat of human cognition. Although birds and nonhuman primates readily learn same–different discriminations and successfully transfer them to novel stimuli, no such demonstration exists for rats. Using a spatial discrimination learning task, we show that rats can both learn to discriminate arrays of visual stimuli containing all same from all different items and transfer this discrimination to arrays composed of novel visual items. These results are consistent with rats’ engaging in same–different categorization. As such, they pave the way for investigations into the perceptual, cognitive, and neurobiological substrates of abstract categorization behavior.

    Footnotes

    • 1 Corresponding author.

      E-mail ed-wasserman{at}uiowa.edu.

    • [Supplemental material is available for this article.]

    • Received December 22, 2011.
    • Accepted January 31, 2012.
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