Pigeons discriminate shapes based on topological features

Area of Science:

• Comparative Psychology
• Animal Cognition
• Visual Perception

Background:

• Topological feature use in visual recognition was previously shown only in species with global-cue precedence.
• Pigeons exhibit local-cue precedence, raising questions about their ability to use topological cues.

Purpose of the Study:

• To investigate whether pigeons utilize topological features for shape discrimination.
• To determine if topological perception is exclusive to species with global-cue precedence.

Main Methods:

• Pigeons were divided into two groups: topology and pseudocategory.
• The topology group discriminated shapes based on the presence or absence of holes.
• The pseudocategory group discriminated shapes based on arbitrary categories.

Main Results:

• The topology group demonstrated rapid improvement in shape discrimination.
• The pseudocategory group showed minimal improvement, suggesting learning beyond rote memorization.
• Data indicate shape discrimination in pigeons relies on on-off feature information.

Conclusions:

• Pigeons, despite local-cue precedence, can perceive topological features.
• Topological perception may be a fundamental, primitive aspect of the visual system across various species.