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Science 16 April 1976:
Vol. 192. no. 4236, pp. 263 - 265
DOI: 10.1126/science.1257767
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Articles

Science, Vol 192, Issue 4236, 263-265
Copyright © 1976 by American Association for the Advancement of Science

articles

Falcon visual acuity

R Fox, SW Lehmkuhle, and DH Westendorf

Grating acuity, the ability to resolve high-contrast square-wave gratings, was measured in a falcon and in humans under comparable conditions. This behavioral test of falcon acuity supports the common belief that Falconiformes have superb vision-the faclon's threshold was 160 cycles per degree, while the human thresholds were 60 cycles per degree. Falcon acuity, however, was much more dependent on lumanance, declining sharply with decreases in luminance.


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
The deep fovea, sideways vision and spiral flight paths in raptors.
V. Tucker (2000)
J. Exp. Biol. 203, 3745-3754
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Stereopsis in the falcon.
R Fox, S. Lehmkuhle, and R. Bush (1977)
Science 197, 79-81
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