COLOR SPACE OF NORMALLY SIGHTED AND COLOR-DEFICIENT OBSERVERS RECONSTRUCTED FROM COLOR NAMING

Authors
Citation
Gv. Paramei, COLOR SPACE OF NORMALLY SIGHTED AND COLOR-DEFICIENT OBSERVERS RECONSTRUCTED FROM COLOR NAMING, Psychological science, 7(5), 1996, pp. 311-317
Citations number
28
Categorie Soggetti
Psychology
Journal title
ISSN journal
09567976
Volume
7
Issue
5
Year of publication
1996
Pages
311 - 317
Database
ISI
SICI code
0956-7976(1996)7:5<311:CSONSA>2.0.ZU;2-0
Abstract
An experimental procedure based on the color-naming method introduced by Boynton, Schafer, and Neun (1964) was used to study the color appea rance of equiluminant spectral stimuli in observers with congenital re d-green color deficiencies, as well as in normal trichromats. subjects ' responses (choice of one or more labels from the set red, yellow, gr een, blue, and white) were converted to numeric scores, which were use d to estimate subjective differences between pairs of colors. Individu al subjects' matrices were processed by means of multidimensional scal ing. As in the direct rating of color dissimilarities in normal trichr omats (Sokolov & Izmailov, 1983) and color-deficient observers (Parame i, Izmailov, & Sokolov, 1991), these indirectly obtained measures yiel ded a color space in which three dimensions appear to be necessary and sufficient. The dimensions are interpreted as evidence for red-green, blue-yellow, and achromatic (saturation) subsystems. Based on the col or-naming technique, three-dimensional spaces were reconstructed for t he color-deficient observers. These results were compared with those o btained by Helm (1964). It is argued that retaining more than one (blu e-yellow) dimension in the color spaces of such observers provides add itional information indicating preservation of residual red-green disc rimination accompanied by finer discrimination of chroma than in norma l trichromats. The spherical model of color discrimination developed f or normal trichromats (Izmailov & Sokolov, 1991) is shown to be valid for color-deficient subjects as well and may be useful as a framework for differentiating protan and deutan types of color deficiency. color -naming functions, which seem not to reveal a differentiation between protans and deutans, provide results from which this differentiation c an be extracted in reconstructed color spaces.