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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Vol. 16, Iss. 2 — Feb. 1, 1999
  • pp: 223–230

Aging and the saturation of colors. 1. Colorimetric purity discrimination

James M. Kraft and John S. Werner  »View Author Affiliations


JOSA A, Vol. 16, Issue 2, pp. 223-230 (1999)
http://dx.doi.org/10.1364/JOSAA.16.000223


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Abstract

Colorimetric purity (Pc) discrimination functions were measured for 21 color-normal observers (11 younger and 10 older observers with mean ages of 30 and 74 years, respectively). On each two-alternative-forced-choice trial, observers saw two flashes of light, a broadband white light [CIE(x, y)=(0.33, 0.35)] and a mixture of broadband and monochromatic light (420–680 nm). The observer’s task was to choose the flash that had a chromatic component. Foveally viewed, circular, 1.2°-diameter stimuli were presented as 1.5-s flashes with 3-s interstimulus intervals in Maxwellian view. Stimuli [250 trolands (td) and 10 td] were equated on the basis of individual heterochromatic flicker photometry functions. Measured Pc discrimination sensitivity was lower in the older group than in the younger group at both light levels, and the performance difference between the age groups was approximately constant across the spectrum. The difference between discrimination at 10 and 250 td was relatively small for the younger group but larger for the older group, indicating a selective performance decrement for older observers at low light levels. The data were modeled as a sum of differential responses from S-cone and L/M-cone chromatic channels. The model and the data indicate similar age-related losses of sensitivity in the two channels, perhaps secondary to receptoral sensitivity losses.

© 1999 Optical Society of America

OCIS Codes
(330.1720) Vision, color, and visual optics : Color vision
(330.4060) Vision, color, and visual optics : Vision modeling
(330.4300) Vision, color, and visual optics : Vision system - noninvasive assessment
(330.5510) Vision, color, and visual optics : Psychophysics
(330.6180) Vision, color, and visual optics : Spectral discrimination

Citation
James M. Kraft and John S. Werner, "Aging and the saturation of colors. 1. Colorimetric purity discrimination," J. Opt. Soc. Am. A 16, 223-230 (1999)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-16-2-223


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  40. Some fraction of the observed age-related sensitivity loss could have been due to increases in ocular media density if the discriminations occurred at a point along the threshold-versus-radiance function where Weber’s law was violated. If this were the case, the slightly lower sensation luminance of the broadband standard for the older observers would cause them to require higher-purity stimuli for discrimination. If conservative assumptions are used, the proportions of the sensitivity loss attributable to increases in ocular media density are less than or equal to 0.03 (L/M mechanism, 250 td), 0.25 (S mechanism, 250 td), 0.36 (L/M mechanism, 10 td), and 0.38 (S mechanism, 10 td).

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