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Related Experiment Videos

Perception of partly occluded objects by young chicks

L Regolin1, G Vallortigara

  • 1University of Padua, Italy.

Perception & Psychophysics
|October 1, 1995
PubMed
Summary
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Newborn chicks can recognize partly occluded objects, demonstrating visual completion abilities previously thought unique to humans. This suggests young birds may perceive objects as whole, even when parts are hidden.

Area of Science:

  • Cognitive Science
  • Animal Behavior
  • Neuroscience

Background:

  • Object completion is common in human vision, but its presence in other species is unknown.
  • Animals typically focus on object parts, not global properties, in learning tasks.

Purpose of the Study:

  • To investigate object completion in a non-primate species, the domestic chick (Gallus gallus).
  • To determine if chicks exhibit amodal completion, perceiving hidden object parts.

Main Methods:

  • Filial imprinting was used to create a social bond between chicks and a red cardboard triangle.
  • Chicks were presented with complete, occluded, or fragmented versions of the imprinting object to assess recognition.

Main Results:

Related Experiment Videos

  • Chicks preferred complete or partly occluded objects over fragmented ones.
  • Chicks imprinted on a complete object preferred complete versions, while those imprinted on fragmented objects preferred fragmented versions.

    • Conclusions:

    • Domestic chicks demonstrate the ability to recognize partly occluded objects.
    • These findings suggest that chicks may experience amodal completion, similar to humans.