a1 Department of Psychology, University of California, Santa Barbara
The presence of rod and cone photorceptors has traditionally been linked to well-defined classes of visual capacity by the generalization known as duplicity theory. This paper summarizes results obtained from studies of vision and the visual system in ground squirrels (Spermophilus sp.) that reveal instances where structure/function linkages depart from expectations based in duplicity theory. The details of these exceptions are reviewed and their possible mechanisms discussed.
(Received February 28 1990)
(Accepted June 06 1990)
Reprint requests to: Gerald H. Jacobs, Department of Psychology, University of California, Santa Barbara, CA 93106, USA.