Pigeons spontaneously form three-dimensional shape categories.

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  • Additional Information
    • Source:
      Publisher: Elsevier Scientific Pub. Co Country of Publication: Netherlands NLM ID: 7703854 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1872-8308 (Electronic) Linking ISSN: 03766357 NLM ISO Abbreviation: Behav Processes Subsets: MEDLINE
    • Publication Information:
      Original Publication: Amsterdam, Elsevier Scientific Pub. Co.
    • Subject Terms:
      Columbidae* ; Depth Perception* ; Discrimination Learning* ; Form Perception* ; Orientation, Spatial*; Animals ; Orientation ; Photic Stimulation ; Reaction Time
    • Abstract:
      We explored the pigeon's representation of the shape of simple three-dimensional objects (geons) rotated in depth (four views each of four geons). Pigeons assigned to the Categorization group had to respond differentially to images of four different geons-termed arch, barrel, brick, and wedge-based on their 3D shape, regardless of the orientation of the object. Pigeons assigned to the Pseudocategorization group had to respond differentially to the same objects based on groupings that did not correspond to object identity, which required the learning of local orientation-dependent features (e.g., a concave curve on top, or the position of an illumination hotspot). The Categorization group, which could employ object-identity representations, quickly achieved highly accurate responding. The Pseudocategorization group, however, failed to achieve reliable above-chance responding. In addition, the reaction times for the Categorization group were significantly shorter than for the Pseudocategorization group. These results indicate that pigeons show a strong, spontaneous tendency to categorize the shapes of different orientations in depth of the same 3D object as similar, if not equivalent; they do so despite the vast differences in image characteristics caused by the variations in orientations, even when such categorization is contrary to the reinforcement contingencies.
      (Copyright © 2018 Elsevier B.V. All rights reserved.)
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    • Grant Information:
      R01 MH047313 United States MH NIMH NIH HHS
    • Contributed Indexing:
      Keywords: Categorization; Object recognition; Pigeons; Pseudocategory; Visual perception
    • Publication Date:
      Date Created: 20181116 Date Completed: 20190218 Latest Revision: 20231110
    • Publication Date:
      20231110
    • Accession Number:
      PMC10631373
    • Accession Number:
      10.1016/j.beproc.2018.11.003
    • Accession Number:
      30439476