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Lookup NU author(s): Dr Gabriele Jordan, Professor Anya Hurlbert
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2023 Optica Publishing Group.Color constancy is the perceptual stability of surface colors under temporal changes in the illumination spectrum. The illumination discrimination task (IDT) reveals worse discrimination for “bluer” illumination changes in normal-trichromatic observers (changes towards cooler color temperatures on the daylight chromaticity locus), indicating greater stability of scene colors or better color constancy, compared with illumination changes in other chromatic directions. Here, we compare the performance of individuals with X-linked color-vision deficiencies (CVDs) to normal trichromats on the IDT performed in an immersive setting with a real scene illuminated by spectrally tunable LED lamps. We determine discrimination thresholds for illumination changes relative to a reference illumination (D65) in four chromatic directions, roughly parallel and orthogonal to the daylight locus. We find, using both a standard CIELUV metric and a cone-contrast metric tailored to distinct CVD types, that discrimination thresholds for daylight changes do not differ between normal trichromats and CVD types, including dichromats and anomalous trichromats, but thresholds for atypical illuminations do differ. This result extends a previous report of illumination discrimination ability in dichromats for simulated daylight changes in images. In addition, using the cone-contrast metric to compare thresholds for bluer and yellower daylight changes with those for unnatural redder and greener changes, we suggest that reduced sensitivity to daylight changes is weakly preserved in X-linked CVDs.
Author(s): Aston S, Jordan G, Hurlbert A
Publication type: Article
Publication status: Published
Journal: Journal of the Optical Society of America A: Optics and Image Science, and Vision
Year: 2023
Volume: 40
Issue: 3
Pages: A230-A240
Print publication date: 01/03/2023
Online publication date: 01/03/2023
Acceptance date: 07/02/2023
Date deposited: 02/05/2023
ISSN (print): 1084-7529
ISSN (electronic): 1520-8532
Publisher: Optica Publishing Group (formerly OSA)
URL: https://doi.org/10.1364/JOSAA.479961
DOI: 10.1364/JOSAA.479961
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