The experimental determination of unique green in the spectrum

Hurvich, Leo M.; Jameson, Dorothea; Cohen, Joseph D.

doi:10.3758/bf03209508

Cited by 78 publications

(22 citation statements)

References 11 publications

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“…The spectral location of the unique hues varies among normal perceivers by as much as 10 percent of the visible spectrum. Thus, something that appears bluish green to one normal perceiver can appear unique green to another normal perceiver and yellowish green to a third (see Hurvich, Jameson, and Cohen 1968). The intersubjective variation in the spectral location of the unique hues forms the basis of an argument against the reality of the colors.…”

Section: The Location Problemmentioning

confidence: 95%

Color Pluralism

Kalderon¹

2007

The Philosophical Review

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Colors are sensible qualities. They are qualities that objects are perceived to have. Thus, when Norm, a normal perceiver, perceives a blue bead, the bead is perceived to have a certain quality, perceived blueness. 'Quality', here, is no mere synonym for property; rather, a quality is a kind of property-a qualitative, as opposed to quantitative, property. (The quantitative is a way of contrasting with the qualitative-perhaps not the only way.)Not only does perception present objects as colored, but perception also presents what these colors are like. When Norm perceives a blue bead, not only does he perceive the bead to be blue, but he perceives what blue is like. The qualitative nature of the colors is manifest to us in our perception of them. Objects are perceived to instantiate color properties, and these color properties are perceived to instantiate higher-order properties that constitute their qualitative character. So, not only does color perception present the existence and distribution of the colors, but it also presents their nature.The qualitative nature of the colors is both important and a problem.

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Section: The Location Problemmentioning

confidence: 95%

Color Pluralism

Kalderon¹

2007

The Philosophical Review

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“…in considering the problem posed by the discrepant results for the yellow/blue equilibria, three possible explanations must be considered: adaptation effects, response biases, and individ~1 differences in the organization of the yellow/blue process. Hurvich et al (1968) showed clearly that there are large individual differences in the effect of "minor" adapting effects on the equilibrium green locus. We have takeii pains to keep the observers neutral-adapted, but this could have been a factor in Westphal's results.…”

Section: Eqcillbrlamentioning

confidence: 99%

“…These same observers tended to show their equilibrium green wavelengths shifted to unusually long wavelengths--a finding that has recently been a focus of debate (Rubin. 1961: Hurvich, Jameson andCohen. 1968).…”

Section: Eqcillbrlamentioning

confidence: 99%

Opponent process additivity—II. Yellow/blue equilibria and nonlinear models

1975

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Abstract-A yellow/blue equilibrium Iight is one which appears neither yellowish nor bluish (i.e. uniquely red, uniquely green, or achromatic). The spectral locus of the monochromatic greenish equilibrium (around 500 nm) shows little, if any, variation over a luminance range of .! log,, units. Reddish equilibria are extraspectral. involving mixtures of short-and long-wave light. Their wavelength composition is noninvariant with luminance: a reddish equilibrium light turns bluish-red if luminance is increased with wavelength composition constant.The additive mixture of the reddish and greenish equilibria is again a yellow, blue equilibrium light.We conclude that yellow/blue equilibrium can be described as the zeroing of a nonlinear functional.which is, however, approximately linear in the short-wavelength ("blue") and middle-wavelength ("green") cone responsesand nonlinear only in the long-wavelength ("red") cone response. The "red" cones contribute to yellowness but via a compressive function of luminance. This effect works against the direction of the Bezold-Briicke hue shift. The Jameson-Hurvich yellowiblue chromatic-response function is only approximately correct; the relative values of yellow/blue chromatic response for an equal energy spectrum must vary somewhat with the energy level.

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“…Measurements of unique-hue spectral loci are important in specifying the characteristics of normal color vision and in theorizing about their underlying mechanisms (Dimmick & Hubbard, 1939;Hurvich, Jameson. & Cohen, 1968;Jameson & Hurvich, 1955;Larimer, Krantz, & Cicerone, 1974Linksz, 1964;Raaijmakers & De Weert, 1975;Richards, 1967;Rubin, 1961;Yager & Taylor, 1970).…”

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confidence: 99%

Long-Term Drifts in Individual Observers' Unique-Hue Spectral Loci

et al. 1978

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Unique-hue spectral loci were measured under conditions of neutral adaptation as part of a study of hue-response recovery following chromatic adaptation. Four observers adjusted the wavelength of the test-field until it appeared to be neither yellow nor blue (unique green) or neither red nor green (unique yellow and blue) in randomized sessions. The results showed that there were marked individual differences and long-term drifts in the unique-hue settings over a period of a month.The variability within a session was minimal.Measurements of unique-hue spectral loci are important in specifying the characteristics of normal color vision and in theorizing about their underlying mechanisms

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The experimental determination of unique green in the spectrum

Cited by 78 publications

References 11 publications

Color Pluralism

Color Pluralism

Opponent process additivity—II. Yellow/blue equilibria and nonlinear models

Long-Term Drifts in Individual Observers' Unique-Hue Spectral Loci

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