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L. S. Baker, A. R. Trujillo, V. J. Volbrecht, J. L. Nerger; Does Foveal-Like Peripheral Color Appearance Exist?. Invest. Ophthalmol. Vis. Sci. 2008;49(13):3833. doi: https://doi.org/.
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It has long been known that as stimulus size is increased in the peripheral retina, color appearance becomes more foveal-like, i.e., the stimulus becomes more saturated and the four elemental hues (blue, green, yellow, red) are more easily discerned. What has not been established is whether the relationship among the four hues is maintained between the fovea and peripheral retina. This study examines the hue relationships in color appearance between the fovea and peripheral retina.
Color-naming data were determined in the fovea and at 10 deg temporal retinal eccentricity using monochromatic stimuli (440-660 nm) presented at four retinal illuminance levels (0.3 to 3.3 log tds). In the peripheral retina, stimuli were presented at various stimulus sizes (.098 deg to 5 deg) under conditions to either maximize (no bleach) or minimize (bleach) rod input; only a 1 deg stimulus was used for the foveal measurements.
Color-naming data obtained in the peripheral retina with the largest stimulus were compared to the 1 deg foveal data at each retinal illuminance level. In each case the stimulus size filled the perceptive field for each elemental hue. In general, there were no differences between the peripheral and foveal saturation functions within the bleach and no bleach conditions; however, hue functions did differ, especially under no bleach conditions. In the no bleach condition, the green and yellow color-naming functions extend to shorter wavelengths compared to the fovea and this difference is greatest at the lower intensities. The same pattern was observed for short-wavelength redness, but long-wavelength redness is reduced in the peripheral retina at the higher intensities.
While saturation may be comparable between foveal and peripheral conditions when stimulus size is appropriately adjusted to fill perceptive fields, the hue perceptions differ. Hue differences between the fovea and peripheral retina are greatest in the no-bleach condition, but are still present in the bleach condition. Assuming rod signals were effectively eliminated in the bleach condition, this result suggests differences in foveal versus peripheral cone functioning.
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