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Recognition of partly occluded objects by fish.

Valeria Anna Sovrano1, Angelo Bisazza

  • 1Department of General Psychology, University of Padua, Via Venezia, 8, 35131 Padova, Italy. valeriaanna.sovrano@unipd.it

Animal Cognition
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Summary
This summary is machine-generated.

This study reveals that fish exhibit amodal completion, the ability to visually complete partly occluded objects. This suggests a widespread visual perception ability across vertebrates, potentially inherited from common ancestors.

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Area of Science:

  • Comparative psychology
  • Neuroscience
  • Animal behavior

Background:

  • Amodal completion, the visual perception of completing partly occluded objects, is known in mammals and birds.
  • Its presence in fish has not been previously documented.

Purpose of the Study:

  • To investigate amodal completion in fish (Xenotoca eiseni).
  • To determine if this perceptual ability extends to non-mammalian, non-avian vertebrates.

Main Methods:

  • Two experiments involved training fish to discriminate between complete and amputated disks.
  • Test trials presented stimuli designed to elicit the perception of occlusion, with fish responses analyzed.

Main Results:

  • Fish demonstrated behaviors consistent with amodal completion in both experimental setups.
  • Results indicate fish perceive occluded objects as complete.

Conclusions:

  • This study provides the first evidence of amodal completion in a fish species.
  • The findings suggest amodal completion is a widespread vertebrate visual ability, possibly an ancient inherited trait.