From: Circuitry to explain how the relative number of L and M cones shapes color experience Journal of Vision. 2016;16(8):18. doi:10.1167/16.8.18 Figure Legend: Predicted relationship between M:L cone ratio and unique hues depends on the underlying circuitry. The predicted influence of a normalization process in the presence of varying %M is shown for the spectral sensitivity of RG and BY chromatic mechanisms under different assumptions about the underlying circuitry. (A) The circuitry of a RG and BY system (left column) incorporating the predominant spectral opponency (middle column) of LGN does not predict large variation in unique hues with %M (right column). (B) The cortical model proposed by De Valois and De Valois anticipates substantial variation in unique green and yellow. ON pathways are represented by black lines; OFF pathways are denoted by gray lines. (C) A hybrid model, built through normalizing the LGN component of the De Valois' model (B), also demonstrates a substantial dependence upon cone numerosity. (D) Finally, a BY system based on a retinal circuit comparing S+M against L signals predicts large changes in unique green with changes in %M. Date of download: 10/22/2017 The Association for Research in Vision and Ophthalmology Copyright © 2017. All rights reserved.