Color perception and compensation in color deficiencies assessed with hue scaling.
Adaptation
Color deficiency
Color vision
Compensation
Hue scaling
Journal
Vision research
ISSN: 1878-5646
Titre abrégé: Vision Res
Pays: England
ID NLM: 0417402
Informations de publication
Date de publication:
06 2021
06 2021
Historique:
received:
10
09
2020
revised:
07
12
2020
accepted:
14
01
2021
pubmed:
27
2
2021
medline:
27
1
2022
entrez:
26
2
2021
Statut:
ppublish
Résumé
Anomalous trichromats have three classes of cone receptors but with smaller separation in the spectral sensitivities of their longer-wave (L or M) cones compared to normal trichromats. As a result, the differences in the responses of the longer-wave cones are smaller, resulting in a weaker input to opponent mechanisms that compare the LvsM responses. Despite this, previous studies have found that their color percepts are more similar to normal trichromats than the smaller LvsM differences predict, suggesting that post-receptoral processes might amplify their responses to compensate for the weaker opponent inputs. We evaluated the degree and form of compensation using a hue-scaling task, in which the appearance of different hues is described by the perceived proportions of red-green or blue-yellow primary colors. The scaling functions were modeled to estimate the relative salience of the red-green to blue-yellow components. The red-green amplitudes of the 10 anomalous observers were 1.5 times weaker than for a group of 26 normal controls. However, their relative sensitivity at threshold for detecting LvsM chromatic contrast was on average 6 times higher, consistent with a 4-fold gain in the suprathreshold hue-scaling responses. Within-observer variability in the settings was similar for the two groups, suggesting that the suprathreshold gain did not similarly amplify the noise, at least for the dimension of hue. While the compensation was pronounced it was nevertheless partial, and anomalous observers differed systematically from the controls in the shapes of the hue-scaling functions and the corresponding loci of their color categories. Factor analyses further revealed different patterns of individual differences between the groups. We discuss the implications of these results for understanding both the processes of compensation for a color deficiency and the limits of these processes.
Identifiants
pubmed: 33636681
pii: S0042-6989(21)00023-7
doi: 10.1016/j.visres.2021.01.006
pmc: PMC8058247
mid: NIHMS1667174
pii:
doi:
Types de publication
Journal Article
Research Support, N.I.H., Extramural
Langues
eng
Sous-ensembles de citation
IM
Pagination
1-15Subventions
Organisme : NEI NIH HHS
ID : R01 EY010834
Pays : United States
Organisme : NEI NIH HHS
ID : R29 EY010834
Pays : United States
Informations de copyright
Copyright © 2021 Elsevier Ltd. All rights reserved.
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