Notes

From this cross-section frame of LGN in a primate, it is possible to notice that it has a layer structure, where each layer receives input from one eye (three layers per eye), hence each layer is "monocular". The LGN presents Magnocellular (bottom two layers, bigger cells), Parvocellular (top four layers) and Koniocellular (white layers, smallest cells) layers of cells. Magnocellular layers do not care about the color, but rather about light intensity differences. They are extremely contrast sensitive. Parvocellular layers are less contrast sensitive, but they are sensitive to color and are more capable of discriminating fine details than their Magnocellular counterparts. Finally, Koniocellular layers deal with short wavelength information. Hence, there is an anatomical segregation according to the information and the eye from which it is coming from. Notice that there exist two LGN, one for each hemisphere. (Computation done by ganglionic cells is very similar to the computation performed by LGN cells).