Notes

At earlier levels, by varying the azimuth of the stimulus (i.e., changing the color) you will observe plots like the ones above. Indeed, the cell will respond differently depending on its color preference. While ganglion cells and LGN cells are pretty much the same, they linearly combine cones' inputs in the same way (red-green cells and blue-yellow cells), when you reach the cortex level of information processing things get more complicated, all the color spectrum is considered, and cells can become selective to extremely specific colors.