Visual Sensitivities to Color Differences in Daylight*

MacAdam, David L.

doi:10.1364/josa.32.000247

Cited by 1,014 publications

(521 citation statements)

References 19 publications

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“…In many classical experiments on chromatic discrimination, the target stimuli were of long duration or were continuously present [31,32]. Even if a neutral surround field is present, then the observer is likely to become adapted to the stimuli that he or she is discriminating; in other words, the equilibrium states of the underlying chromatic channels will shift to coincide with the average of the currently offered stimuli.…”

Section: (D) Stimulus Duration As a Critical Variablementioning

confidence: 99%

Is discrimination enhanced at the boundaries of perceptual categories? A negative case

Danilova

Mollon

2014

Proc. R. Soc. B.

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The human visual system imposes discrete perceptual categories on the continuous input space that is represented by the ratios of excitations of the cones in the retina. Is discrimination enhanced at the boundaries between perceptual hues, in the way that discrimination may be enhanced at the boundaries between speech sounds in hearing? In the chromaticity diagram, the locus of unique green separates colours that appear yellowish from those that appear bluish. Using a two-alternative spatial forced choice and an adapting field equivalent to the Daylight Illuminant D65, we measured chromatic discrimination along lines orthogonal to the locus of unique green. In experimental runs interleaved with these performance measurements, we obtained estimates of the phenomenological boundary from the same observers. No enhancement of objectively measured discrimination was observed at the category boundary between yellowish and bluish hues. Instead, thresholds were minimal at chromaticities where the ratio of long-wave to middle-wave cone excitation was the same as that for the background adapting field.

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Section: (D) Stimulus Duration As a Critical Variablementioning

confidence: 99%

Is discrimination enhanced at the boundaries of perceptual categories? A negative case

Danilova

Mollon

2014

Proc. R. Soc. B.

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“…Second, it excludes more-dimensional problems where two or more parameters are varied conjointly, e.g. in the context of colour discrimination (MacAdam, 1942;Silberstein & MacAdam, 1945) or in joint frequency/orientation discrimination (Treutwein, Rentschler & Caelli 1989). In two-dimensional problems the single value of a threshold corresponds to a closed curve around a reference stimulus delineating a non-discrimination area.…”

Section: Experimental Designsmentioning

confidence: 99%

Adaptive psychophysical procedures

1995

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“…4 These were represented by a series of ellipses in the CIE chromaticity diagram. The variation in size of these ellipses demonstrates the differences in individual sensitivity to chromatic stimuli, as well as nonuniformity of the CIE diagram itself.…”

Section: Discussionmentioning

confidence: 99%

Specifying colours for colour vision testing using computer graphics

Toufeeq

2004

Eye

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Aims This paper describes a novel test of colour vision using a standard personal computer, which is simple and reliable to perform. Methods Twenty healthy individuals with normal colour vision and 10 healthy individuals with a red/green colour defect were tested binocularly at 13 selected points in the CIE (Commission International d'Eclairage, 1931) chromaticity triangle, representing the gamut of a computer monitor, where the x, y coordinates of the primary colour phosphors were known. Results The mean results from individuals with normal colour vision were compared to those with defective colour vision. Of the 13 points tested, five demonstrated consistently high sensitivity in detecting colour defects. Conclusion The test may provide a convenient method for classifying colour vision abnormalities.

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Visual Sensitivities to Color Differences in Daylight*

Cited by 1,014 publications

References 19 publications

Is discrimination enhanced at the boundaries of perceptual categories? A negative case

Is discrimination enhanced at the boundaries of perceptual categories? A negative case

Adaptive psychophysical procedures

Specifying colours for colour vision testing using computer graphics

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