In the Eye of the Beholder

Geoffrey E. Hill

in A Red Bird in a Brown Bag

Published in print October 2002 | ISBN: 9780195148480
Published online April 2010 | e-ISBN: 9780199893683 | DOI:

Series: Oxford Ornithology Series

In the Eye of the Beholder

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This chapter contrasts the tri-stimulus visual system of humans, based on three visual cones, with the tetra-stimulus visual system of birds, based on four visual cones. A key difference between the vision of humans and birds is that birds see ultraviolet light that is invisible to humans. Methods for quantifying plumage color are discussed in addition to methods for scoring the extent of color (patch size) and pigment symmetry.

Keywords: tri-stimulus; tetra-stimulus; hue; saturation; plumage color; patch size; vision; ultraviolet; color symmetry; pigment symmetry

Chapter.  5499 words.  Illustrated.

Subjects: Vertebrates

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