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Related Experiment Video

Updated: Apr 30, 2026

A Method for Investigating Change Blindness in Pigeons Columba Livia
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Do pigeons (Columba livia) perceive object unity?

T Ushitani1, K Fujita, R Yamanaka

  • 1Department of Psychology, Graduate School of Letters, Kyoto University, Yoshida-Honmachi, Sakyo, Kyoto 606-8501, Japan, ushitani@psy.bun.kyoto-u.ac.jp.

Animal Cognition
|April 30, 2014
PubMed
Summary
This summary is machine-generated.

Pigeons do not perceive occluded objects as unified, unlike human infants. Even when two rods move together behind an occluder, pigeons treated them as separate, suggesting different object perception mechanisms.

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Area of Science:

  • Comparative psychology
  • Animal cognition
  • Visual perception

Background:

  • Human infants perceive unified objects even when partially occluded.
  • Understanding object perception in non-human animals provides insights into evolutionary pathways.

Purpose of the Study:

  • To investigate whether pigeons exhibit object unity, similar to human infants.
  • To determine if pigeons complete occluded visual information.

Main Methods:

  • Pigeons were trained on a matching-to-sample task using stimuli of one rod versus two aligned rods.
  • Experiments involved occluding the center of the rods to test for perception of unity.
  • Different occluder shapes were used to vary visual cues.

Main Results:

  • Pigeons consistently failed to perceive the two moving rods as a single, unified object.
  • Subjects matched the partially occluded stimulus to the two-rod comparison more often than the single-rod comparison.
  • Results were consistent across various occluder shapes.

Conclusions:

  • Pigeons do not demonstrate object unity for occluded stimuli.
  • This suggests pigeons may utilize different visual processing strategies compared to humans.
  • Alternative object identification mechanisms may have evolved in avian species.