Specificity of the chromatic noise influence on the luminance contrast discrimination to the color vision phenotype

Many studies have examined how color and luminance information are processed in the visual system. It has been observed that chromatic noise masked luminance discrimination in trichromats and that luminance thresholds increased as a function of noise saturation. Here, we aimed to compare chromatic n...

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Bibliographic Details
Published in:	Scientific reports Vol. 10; no. 1; p. 17897
Main Authors:	Sousa, Bruna Rafaela Silva, Loureiro, Terezinha Medeiros Gonçalves, Goulart, Paulo Roney Kilpp, Cortes, Maria Izabel Tentes, Costa, Marcelo Fernandes, Bonci, Daniela Maria Oliveira, Baran, Luiz Claudio Portnoi, Hauzman, Einat, Ventura, Dora Fix, Miquilini, Leticia, Souza, Givago Silva
Format:	Journal Article
Language:	English
Published:	London Nature Publishing Group UK 21-10-2020 Nature Publishing Group
Subjects:	631/378 631/378/2613 631/378/2613/2141 631/378/2613/2615 631/378/3917 Adult Color Perception - physiology Color vision Color Vision - physiology Color Vision Defects - physiopathology Color Vision Defects - psychology Contrast Sensitivity - physiology Discrimination, Psychological - physiology Female Humanities and Social Sciences Humans Information processing Male multidisciplinary Noise Pattern Recognition, Visual - physiology Phenotype Phenotypes Photic Stimulation Science Science (multidisciplinary) Sensory Thresholds - physiology Visual discrimination Visual system Visual thresholds Young Adult
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Summary:	Many studies have examined how color and luminance information are processed in the visual system. It has been observed that chromatic noise masked luminance discrimination in trichromats and that luminance thresholds increased as a function of noise saturation. Here, we aimed to compare chromatic noise inhibition on the luminance thresholds of trichromats and subjects with severe deutan or protan losses. Twenty-two age-matched subjects were evaluated, 12 trichromats and 10 with congenital color vision impairment: 5 protanopes/protanomalous, and 5 deuteranopes/deuteranomalous. We used a mosaic of circles containing chromatic noise consisting of 8 chromaticities around protan, deutan, and tritan confusion lines. A subset of the circles differed in the remaining circles by the luminance arising from a C-shaped central target. All the participants were tested in 4 chromatic noise saturation conditions (0.04, 0.02, 0.01, 0.005 u′v′ units) and 1 condition without chromatic noise. We observed that trichromats had an increasing luminance threshold as a function of chromatic noise saturation under all chromatic noise conditions. The subjects with color vision deficiencies displayed no changes in the luminance threshold across the different chromatic noise saturations when the noise was composed of chromaticities close to their color confusion lines (protan and deutan chromatic noise). However, for tritan chromatic noise, they were found to have similar results to the trichromats. The use of chromatic noise masking on luminance threshold estimates could help to simultaneously examine the processing of luminance and color information. A comparison between luminance contrast discrimination obtained from no chromatic and high-saturated chromatic noise conditions could be initially undertaken in this double-duty test.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	2045-2322 2045-2322
DOI:	10.1038/s41598-020-74875-3