Editing Lateral geniculate nucleus (section)

===Color processing===
{{see also|Opponent process}}
The LGN is integral in the early steps of color processing, where opponent channels are created that compare signals between the different [[Photoreceptor cell]] types. The output of P-cells comprises red-green opponent signals. The output of M-cells does not include much color opponency, rather a sum of the red-green signal that evokes [[luminance]]. The output of K-cells comprises mostly blue-yellow opponent signals.<ref name=Gho17>[https://doi.org/10.1016/j.pneurobio.2017.06.002 M. Ghodrati, S.-M. Khaligh-Razavi, S.R. Lehky, Towards building a more complex view of the lateral geniculate nucleus: recent advances in understanding its role, Prog. Neurobiol. 156:214–255, 2017.]</ref><!-- This review paper can be used to update [[#Function in visual perception]] section -->