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Vision Res. 2000;40(24):3333-44.

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

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Department of Psychology, University of Washington, PO Box 351525, 98195, Seattle, WA, USA.


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.

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