Abstract
The magnitudes of three color processes R, G and B at the fovea were measured by means of Motokawa's method, which consisted of measuring the electrical excitability of the eye after a brief illumination with monochromatic light of various wave-lengths.
Color diagrams were constructed from the measured magnitudes of R, G and B. They were found very similar to the usual chromaticity diagram constructed from color mixing data. So they can be used for specification of colors. The fact that such a color diagram can be constructed from three physiological quantities suggests that the normal foveal vision is essentially trichromatic. The limitation of the validity of the trichromatic principle was further discussed on the basis of physiological data.
We wish to thank Prof. K. Motokawa for his good advice and cordial guidance.
