Abstract
On bright surrounds, red-green-balanced yellow targets become greenish brown with decreased target luminance, and red-green-balanced brown targets become reddish yellow with increased target luminance. These effects imply luminance- and/or contrast-dependent weighting of M- and L-cone signals in post-receptoral pathways. We show psychophysically that luminance contrast between the surround and the target is the primary determinant of the magnitude of red-green hue shift, requiring surround luminance at least twice the target luminance and increasing with further increases of surround/target contrast. There is a much smaller effect of absolute stimulus luminance, with dimmer stimuli showing slightly larger hue shifts. To evaluate a possible retinal origin of the changes in cone-signal weightings underlying the hue shift, we recorded spike responses from both ON- and OFF-center midget ganglion cells in peripheral primate retina. We found no evidence that the relative strength of L- and M-cone post-receptoral responses changed systematically with change of surround irradiance. Nor was there any systematic difference between ON- and OFF-subtypes. This suggests that the change in cone signal weighting occurs later in the visual system.
© 2018 Optical Society of America
Full Article | PDF ArticleMore Like This
Tanner DeLawyer, Melissa Tayon, Chia-li Yu, and Steven L. Buck
J. Opt. Soc. Am. A 35(4) B114-B121 (2018)
Steven L. Buck and Tanner DeLawyer
J. Opt. Soc. Am. A 31(4) A75-A81 (2014)
Athanasios Panorgias, Janus J. Kulikowski, Neil R. A. Parry, Declan J. McKeefry, and Ian J. Murray
J. Opt. Soc. Am. A 29(2) A233-A239 (2012)