Scaling of color sensation by magnitude estimation: a contribution to opponent-colors theory.

Saturation and hue perceived in monochromatic stimuli and in light mixtures were scaled psychophysically by a direct magnitude estimation method. The colors were of aperture mode and were presented against a dark background. As a result opponent-colors functions were obtained which show the hue sensations produced by the lights of the visible spectrum (under the observing conditions used).

[Evidence for reduced colour vision in carriers of congenital colour vision deficiencies (author's transl)].

The ability to recognize small spots of coloured light in parafoveal regions of the retina was investigated in women heterozygous for protanopia (2 subjects), deuteranopia (2 subjects), or deuteranomaly (1 subject) and in 3 normal subjects. The homozygous colour normals had excellent discrimination up to 8 degrees excentricity, whereas in heterozygous carriers of congenital colour vision deficiencies the ability to differentiate colours varied from point to point within the retina. The results may be explained by assuming the existence of alternating patches of trichromatic and dichromatic cell populations with the retina of the heterozygous carriers.