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Effects of occlusion on pigeons' visual object recognition.
Norma T DiPietro1, Edward A Wasserman, Michael E Young
1Department of Psychology, University of Iowa, Iowa City 52242-1407, USA.
Perception
|December 20, 2002
Summary
Pigeons can learn to recognize objects even when they are hidden. This ability, known as object recognition, improves when pigeons learn to distinguish objects from their backgrounds.
Area of Science:
- Cognitive Science
- Animal Behavior
Background:
- Casual observation suggests animals recognize occluded objects, but laboratory evidence in pigeons is lacking.
- Previous research has not demonstrated pigeons' ability to identify objects that are partially hidden.
Purpose of the Study:
- To investigate pigeons' capacity for recognizing occluded objects.
- To determine if specific training enhances pigeons' object recognition skills.
Main Methods:
- Pigeons were trained to recognize unoccluded objects and then tested on partially occluded or surface-obscured versions.
- Further training involved stimuli placed on top of an occluder before re-testing recognition of occluded objects.
Main Results:
- Initial recognition of occluded objects was weak.
- Training with occluded stimuli significantly improved pigeons' recognition of hidden objects.
- This improved recognition transferred to novel, previously unseen objects.
Conclusions:
- Pigeons can learn to recognize occluded objects.
- Mastering the discrimination between an object and its occluder is key to recognizing hidden items.
- This discrimination ability generalizes to new objects, indicating a robust learning process.