Color Representation at the‘Mid-Level’of Human Visual System

Abstract

Color spaces based on cone-response opponency (including CIE system) are useful for photometry. However, several psychophysical and physiological studies have suggested that they do not represent color appearance. Color signals for color appearance should exist somewhere in between the opponent and categorical levels:‘mid-level’of color-vision system. In this text, we would like to introduce some of our attempt on investigating color information processing systems at the mid-level by using psychophysical method and functional brain imaging technique (fMRI).