Chimpanzee color vision. II. Color mixture proportions.

Abstract

II. Tests were made of (1) the proportions of 2 spectral complementaries (610 and 495 mu.) required in a mixture for it to match white, and (2) the proportions of spectral red (640 mu.) and green (560 mu.) required in a mixture for it to match a filtered yellow. In the first test, the chimpanzees required a slightly higher proportion of red than did human subjects. In the 2d test the proportions of the 2 colors were the same as those found for humans. For the longer spectral wavelengths the sensitivity of chimpanzees is equal to that of humans.[long dash]III. The spectral limits were detd. by finding the wave-lengths at which discrimination between spectral color and darkness became impossible. The spectrum for chimpanzees was found to be as extensive as that of humans.