@article{Delius2017Symme-40793,
  year={2017},
  doi={10.1371/journal.pone.0187541},
  title={Symmetry recognition by pigeons : Generalized or not?},
  number={11},
  volume={12},
  journal={PLoS ONE},
  author={Delius, Juan and Delius, Julia A. M. and Lee, Jennifer M.},
  note={Article Number: e0187541}
}

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    <dcterms:abstract xml:lang="eng">This note looks into the reasons why earlier reports may have arrived at differing conclusions about pigeons' capacity to categorize bilaterally symmetric and asymmetric visual patterns. Attention is drawn to pigeons' comparatively superior visual flicker resolution and superior visual linear acuity by reporting results of two ad-hoc experiments. This circumstance turns out to constrain conclusions drawn by earlier symmetry-asymmetry studies that used computer-generated patterns displayed on cathode ray tube monitors as these suffered from pictorial distortions. Additionally one of the studies involved patterns of inconsistent symmetry at global and local levels. A smaller-scale experiment using slide-projected unequivocal symmetric and asymmetric patterns yielded results compatible with the supposition that pigeons are capable of a symmetry-asymmetry categorization. The possibility that an artfactual cue may have inadvertently accentuated this capability in an earlier own experiment is considered.</dcterms:abstract>
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    <dc:contributor>Delius, Juan</dc:contributor>
    <dc:rights>Attribution 4.0 International</dc:rights>
    <dc:contributor>Lee, Jennifer M.</dc:contributor>
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    <dcterms:title>Symmetry recognition by pigeons : Generalized or not?</dcterms:title>
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