Notes

What we discussed in color vision can be summarized by the figure below, where we have the cones tuned to the three wavelengths associated with red, blue and green. Then, at the level of LGN, we have colors opponents with red-green, blue-yellow and luminance opponency. Finally, in higher order areas (e.g., V1, V2, V3) we have a wide plethora of possibilities, with cells tuned to specific colors.

Other major areas of research are color constancy and color appearance. Color constancy is the ability of humans of maintaining unchanged color appearance of objects even when varying illumination or context. Our brain is capable of discerning the contribution of illumination and reflectance in the color signal perceived, such that we are capable of interpreting different color signals as equal when varying conditions. This level of information processing takes place in extrastriate areas.