Notes

The same exact experiment discussed above is performed in V2 and V3. Here, we see major differences. We do not have any more a red-green and a blue-yellow channel, but we have an almost-equal distribution across the azimuth axis. There is a much more widespread distribution over color preferences. In addition, we notice that there is more density in high-levels of elevation, thus indicating that cells are more "interested" in luminance rather than color. Overall, the cells become more specialized with intermediate color preferences and stronger responses to higher levels of illumination.