Opponent-color models and the influence of rod signals on the loci of unique hues

Vision Res. 2000;40(24):3333-44. doi: 10.1016/s0042-6989(00)00191-7.


To investigate how rod signals influence hue perception and how this influence can be incorporated into opponent-color models, we measured the shift of unique-hue loci under dark-adapted conditions compared with cone-plateau conditions. Rod signals produced shifts of all spectral unique hues (blue, green, yellow) but in a pattern that was inconsistent with simple additive combinations of rod and cone inputs in opponent-color models. The shifts are consistent with non-linear models in which rod influence requires non-zero cone signals. Cone-signal strength may modulate or gate rod influence, or rod signals may change the gain of cone pathways.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adaptation, Ocular / physiology
  • Adult
  • Color Perception / physiology*
  • Color Perception Tests / methods
  • Female
  • Humans
  • Lighting
  • Male
  • Middle Aged
  • Nonlinear Dynamics
  • Retinal Cone Photoreceptor Cells / physiology*
  • Retinal Rod Photoreceptor Cells / physiology*