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How Animals See the WorldComparative Behavior, Biology, and Evolution of Vision$
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Olga F. Lazareva, Toru Shimizu, and Edward A. Wasserman

Print publication date: 2012

Print ISBN-13: 9780195334654

Published to Oxford Scholarship Online: May 2012

DOI: 10.1093/acprof:oso/9780195334654.001.0001

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Grouping and Early Visual Processing in Avian Vision

Grouping and Early Visual Processing in Avian Vision

(p.43) 3 Grouping and Early Visual Processing in Avian Vision
How Animals See the World

Robert G. Cook

Carl Erick Hagmann

Oxford University Press

This chapter examines early visual processing in birds revealed by the analysis of multi-element textured arrays. Pigeons, and presumably most other species of birds, share many common properties with humans regarding the early registration and grouping of visual information. Overall, perceptual grouping involves spatially parallel processes that cover an extensive area of their frontal visual field. Initially, this information is separated into different streams that map the features of visual dimensions like color, orientation, brightness, and likely other features associated with different shapes, such as terminations, angles, parallelism, or curvature. The critical outputs from these different streams are the identity and location of linear edges and boundaries and their relation to larger homogeneous regions of highly similar elements. These outputs are critically involved in the construction of object shape and surface relations, as well as in the determination of figure-ground status. These different streams converge to produce a multidimensional map where this information is combined.

Keywords:   bird vision, early visual processing, textured arrays, terminations, angles, parallelism, curvature, perceptual grouping

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