Color vision in the squirrel monkey.

Abstract

This study investigated hue discrimination in the squirrel monkey, Saimiri sciureus. 5 Ss, previously trained to displace-test objects for food reward, were tested on a series of hue discrimination problems. The Ss could successfully discriminate yellow-green, green, and blue color combinations, but showed deficiencies in the long wave length end of the spectrum. These results indicate that the squirrel monkey may have a 2-color visual system of the red-blind type, characteristic of the cebus monkey and also of human protanopia.