Rod influences on hue perception: Effect of background light level

Knight, Roger; Buck, Steven L.

doi:10.1002/1520-6378(2001)26:1+<::aid-col14>3.0.co;2-g

Cited by 12 publications

(18 citation statements)

References 18 publications

(21 reference statements)

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“…Small-bistratified pathways mediate the rod blue bias and rod red bias found at short wavelengths. Our psychophysical results [10][11][12] imply that the midget-mediated rod green bias is faster-acting and found over a wider range of light levels than the small-bistratifiedmediated rod blue and SW-red biases.…”

Section: Possible Substratesupporting

confidence: 68%

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What is the hue of rod vision?

Buck

2000

Color Res. Appl.

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Textbooks say rod vision is colorless. However, evidence that rod signals influence hue comes from several lines of psychophysical studies, including scotopic color contrast, color matching, hue scaling, and unique-hue loci. Some widely cited early studies suggested that there is a single rod hue, which is blue. Other studies have suggested that various other hues, or even all hues, can be associated with rod stimulation. This article presents a conceptual framework that helps reconcile many of these findings and that involves two unifying generalizations. (1) Rod signals are associated with signals from all three cone types and have a ubiquitous influence on all portions of the color pathways.(2) But rod signals have multiple inherent biases (differential weightings) in their effects on color pathways, and the "net effect" of these individual biases is often found to be blue. The multiple rod influences on hue, and their net blue influence, may have a basis in the parallel pathways that are the retinal substrate of color vision.

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Section: Possible Substratesupporting

confidence: 68%

“…[10][11][12] The common feature of all these procedures that allows them to isolate separate rod influences is their use of narrow-band stimuli. This permits separation of rod influences in different spectral regions that can be further distinguished by means of differences in temporal or intensity dependence.…”

Section: Separation Of Rod Influences On Huementioning

confidence: 99%

What is the hue of rod vision?

Buck

2000

Color Res. Appl.

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“…After a period of dark adaptation, signals from rod photoreceptors can influence observers' reports of subjective hues of spectral lights [1][2][3][4] and the spectral wavelengths (loci) associated with unique (single hue percept) and binary (two equally balanced hue percepts) hues. [5][6][7] Such rod influences affect the distribution across the 400 -700 nm spectrum of all four basic hue percepts (red, green, yellow, blue) and all unique-and binary-hue loci.…”

Section: Introductionsupporting

confidence: 73%

Stimulus size affects rod influence on tritan chromatic discrimination

Knight¹,

Buck²,

Pereverzeva³

2000

Color Res. Appl.

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A signal-detection procedure was used to measure the influence of rods on S-cone-mediated ("tritan") chromatic discrimination in normal trichromatic human observers. Rod influence on discriminability of both increments and decrements in S-cone excitation was assessed by comparing cone-plateau (minimizes rod influence) and dark adapted (maximizes rod influence) conditions. For 1°stim-uli, rods impaired tritan discrimination, especially for Scone decrements. For 8°stimuli, rods had no systematic effects. This confirms that rods have the same direction of effect (impairment) on tritan discrimination as has been shown for Rayleigh (L-M) discrimination. However, the size dependence of the rod effect on tritan discrimination is opposite to that previously shown for either Rayleigh discrimination or hue appearance. This provides further evidence for separable rod influences on S-cone and L-M cone pathways.

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“…Prior studies have also noted the faster time course [15–17] and luminance dependence [11,12,3] of the rod green bias. These differences, as well as the specific spectral ranges and unique hues for which the rod hue biases occur, support the idea that the rod green bias is mediated by interaction of signals from rods and M and L cones, presumably in midget-ganglion-cell pathways, and the rod red bias and blue bias are mediated by interaction of signals from rods and S cones, possibly in small-bistratified-ganglion-cell pathways.…”

Section: Discussionmentioning

confidence: 97%

“…The background was black (zero level for each gun, at least a factor of 10 4 cd/m 2 below test level). Low mesopic test stimulus levels, such as the present, have been demonstrated to maximize rod influence but still allow sufficient cone function for reliable hue-balance settings for most observers [10–12]. A black foam board surrounded the CRT display, to eliminate stray light from the room.…”

Section: Methodsmentioning

confidence: 99%

Rod hue biases for foveal stimuli on CRT displays

Foote

Buck

2013

J. Opt. Soc. Am. A

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Signals from rod photoreceptors bias (shift) the hues determined by cone photoreceptors for extrafoveal mesopic stimuli, creating green, blue, and red rod hue biases at long, middle, and short wavelengths, respectively. The fovea contains far fewer rods and S cones but may not be immune to rod hue biases. Here, we determine the biases found for mesopic foveal stimuli presented on a CRT display. The rod green bias was observed at unique yellow for all but one observer with 2° tests and persisted for most observers with 0.5° tests. The rod red bias typically seen at unique blue in extrafoveal studies was not apparent for either size of foveal test stimulus, and it was sometimes replaced by a rod green bias. The rod blue bias typically seen at unique green and unique red in extrafoveal studies was weak on average and inconsistent for both sizes of foveal test stimuli. Thus, small mesopic foveal stimuli permit rod influence on M- and L-cone color pathways but disadvantage rod influence on S-cone pathways, perhaps because of the sparseness of foveal S-cones. However, some observers did show idiosyncratic foveal rod hue biases that do not follow the general trends.

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Rod influences on hue perception: Effect of background light level

Cited by 12 publications

References 18 publications

What is the hue of rod vision?

What is the hue of rod vision?

Stimulus size affects rod influence on tritan chromatic discrimination

Rod hue biases for foveal stimuli on CRT displays

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