Papers in the Biological Sciences
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We used a psychophysical method to examine the ability of three corvid species to discern fine-grained spatial information. Nutcrackers, pinyon jays, and scrub-jays were required to discriminate the distance between two landmarks on a computer screen in an operant chamber. All three species were able to discriminate between arrays that differed by 20 mm; the discrimination gradients for scrub-jays and pinyon jays were sharper than those for nutcrackers, however. The results suggest that differences in spatial memory among these species are not related to differences in fine-grained perception.
Published in Learning & Behavior 2005, 33 (1), 59-66. Copyright 2005 Psychonomic Society, Inc. Used by permission. http://lb.psychonomic-journals.org/