Review of Studies on Visual Perception in Grey Parrots (Psittacus erithacus): The Muller-Lyer Illusion, Amodal and Modal Completion

Few avian studies on optical illusions are directly comparable to those with humans. Grey parrots that have some referential use of English speech, however, allow for such comparative studies, as these birds can be tested just as are humans, by asking them to describe exactly what they have seen. He...

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Bibliographic Details
Published in:Animal Behavior and Cognition
Main Author: Irene M. Pepperberg
Format: Article in Journal/Newspaper
Language:English
Published: Animal Behavior and Cognition 2017
Subjects:
Grey parrots
Optical illusions
Parrot visual perception
Müller-Lyer
Kanisza
Amodal completion
Zoology
QL1-991
Avian Studies
Online Access:https://doi.org/10.26451/abc.04.03.14.2017
https://doaj.org/article/76481b98fabc4d98afc04f5a5265e656
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Summary:Few avian studies on optical illusions are directly comparable to those with humans. Grey parrots that have some referential use of English speech, however, allow for such comparative studies, as these birds can be tested just as are humans, by asking them to describe exactly what they have seen. Here I review two studies, one on the Müller-Lyer illusion (Pepperberg, Vicinay, & Cavanagh, 2008), one on amodal and modal perception (Pepperberg & Nakayama, 2016), that demonstrate similarities between human and Grey parrot perceptual abilities.

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