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Prior experience affects amodal completion in pigeons.

Yasuo Nagasaka1, Olga F Lazareva, Edward A Wasserman

  • 1University of Iowa, Iowa City, Iowa, USA. nyasuo@brain.riken.jp

Perception & Psychophysics
|August 31, 2007
PubMed
Summary

Pigeons trained to identify partially occluded shapes learned to prefer complete shapes. This suggests that visual experience with 2D images may enhance amodal completion abilities in pigeons through perceptual learning.

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Area of Science:

  • * Cognitive Psychology
  • * Animal Behavior
  • * Visual Perception

Background:

  • * Amodal completion is the perceptual phenomenon where an object is perceived as complete despite being partially occluded.
  • * Understanding the mechanisms of amodal completion can provide insights into visual processing in non-human animals.

Purpose of the Study:

  • * To investigate whether pigeons exhibit amodal completion.
  • * To determine if perceptual learning influences amodal completion in pigeons.

Main Methods:

  • * A three-alternative forced-choice task was used to train four pigeons.
  • * Pigeons discriminated a target stimulus (partially occluded shape) from two foil stimuli (complete or incomplete shape).
  • * The percentage of errors made on the complete foil was the primary dependent measure.

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Main Results:

  • * Initially, pigeons committed approximately 50% of errors to the complete foil.
  • * As training progressed, error rates for the complete foil increased, reaching 70% after re-exposure.
  • * This indicates a shift in preference towards the complete foil, suggesting it was perceived as more similar to the occluded target.

Conclusions:

  • * Pigeons demonstrated evidence of amodal completion.
  • * Perceptual learning, through repeated exposure to 2D images, appears to facilitate amodal completion in pigeons.
  • * These findings suggest that visual experience plays a role in the development of perceptual completion abilities.