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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. 18, Iss. 2 — Feb. 1, 2001
  • pp: 310–318

Age-related changes in wavelength discrimination

Keizo Shinomori, Brooke E. Schefrin, and John S. Werner  »View Author Affiliations


JOSA A, Vol. 18, Issue 2, pp. 310-318 (2001)
http://dx.doi.org/10.1364/JOSAA.18.000310


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Abstract

Wavelength discrimination functions (420 to 620–650 nm) were measured for four younger (mean 30.9 years) and four older (mean 72.5 years) observers. Stimuli consisted of individually determined isoluminant monochromatic lights (10 Td) presented in each half of a 2° circular bipartite field with use of a Maxwellian-view optical system. A spatial two-alternative forced-choice method was used in combination with a staircase procedure to determine discrimination thresholds across the spectrum. Small but consistent elevations in discrimination thresholds were found for older compared with younger observers. Because the retinal illuminance of the stimuli was equated across all observers, these age-related losses in discrimination are attributable to neural changes. Analyses of these data reveal a significant change in Weber fraction across adulthood for a chromatically opponent pathway receiving primarily antagonistic signals from middle-wavelength-sensitive and long-wavelength-sensitive cones but not for a short-wavelength-sensitive cone pathway.

© 2001 Optical Society of America

OCIS Codes
(330.1690) Vision, color, and visual optics : Color
(330.1720) Vision, color, and visual optics : Color vision
(330.4060) Vision, color, and visual optics : Vision modeling
(330.5510) Vision, color, and visual optics : Psychophysics
(330.6180) Vision, color, and visual optics : Spectral discrimination

History
Original Manuscript: July 28, 2000
Revised Manuscript: July 31, 2000
Manuscript Accepted: July 31, 2000
Published: February 1, 2001

Citation
Keizo Shinomori, Brooke E. Schefrin, and John S. Werner, "Age-related changes in wavelength discrimination," J. Opt. Soc. Am. A 18, 310-318 (2001)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-18-2-310


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