Spectral efficiency of blackness induction

  • The spectral efficiency of blackness induction was measured in three normal trichromatic observers and in one deuteranomalous observer. The psychophysical task was to adjust the radiance of a monochromatic 60–120′ annulus until a 45′ central broadband field just turned black and its contour became indiscriminable from a dark surrounding gap that separated it from the annulus. The reciprocal of the radiance required to induce blackness with annulus wavelengths between 420 and 680 nm was used to define a spectral-efficiency function for the blackness component of the achromatic process. For each observer, the shape of this blackness-sensitivity function agreed with the spectral-efficiency function based on heterochromatic flicker photometry when measured with the same 60–120′ annulus. Both of these functions matched the Commission Internationale de l'Eclairage Vλ function except at short wavelengths. Ancillary measurements showed that the latter difference in sensitivity can be ascribed to nonuniformities of preretinal absorption, sinceThe spectral efficiency of blackness induction was measured in three normal trichromatic observers and in one deuteranomalous observer. The psychophysical task was to adjust the radiance of a monochromatic 60–120′ annulus until a 45′ central broadband field just turned black and its contour became indiscriminable from a dark surrounding gap that separated it from the annulus. The reciprocal of the radiance required to induce blackness with annulus wavelengths between 420 and 680 nm was used to define a spectral-efficiency function for the blackness component of the achromatic process. For each observer, the shape of this blackness-sensitivity function agreed with the spectral-efficiency function based on heterochromatic flicker photometry when measured with the same 60–120′ annulus. Both of these functions matched the Commission Internationale de l'Eclairage Vλ function except at short wavelengths. Ancillary measurements showed that the latter difference in sensitivity can be ascribed to nonuniformities of preretinal absorption, since the annular field excluded the central 60′ of the fovea. Thus our evidence indicates that, at least to a good first approximation, induced blackness is inversely related to the spectral-luminosity function. These findings are consistent with a model that separates the achromatic and the chromatic pathways.show moreshow less

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Metadaten
Author:John S. Werner, Carola M. Cicerone, Reinhold Kliegl, Denise DellaRosa
URN:urn:nbn:de:kobv:517-opus-16897
Series (Serial Number):Postprints der Universität Potsdam : Humanwissenschaftliche Reihe, ISSN 1866-8364 (paper 040)
Document Type:Postprint
Language:English
Date of Publication (online):2008/09/17
Year of Completion:1984
Publishing Institution:Universität Potsdam
Release Date:2008/09/17
Source:Journal of the Optical Society of America A: Optics, Image Science, and Vision. - 1 (1984), 9, pp. 981-986. - ISSN (print) 1084-7529, ISSN (online) 0740-3232
Organizational units:Humanwissenschaftliche Fakultät / Institut für Psychologie
Extern / Extern
Dewey Decimal Classification:1 Philosophie und Psychologie / 15 Psychologie / 150 Psychologie
Licence (German):License LogoKeine Nutzungslizenz vergeben - es gilt das deutsche Urheberrecht
Notes extern:
first published in:
Journal of the Optical Society of America A: Optics, Image Science, and Vision. - 1 (1984), 9, pp. 981-986
ISSN (print) 1084-7529
ISSN (online) 0740-3232
© 2007 Optical Society of America, Inc.