Hue-discrimination in normal colour-vision

Abstract

Hue-discrimination curves were obtained for normal observers; the apparatus and method of observation are descr. and the results discussed. Minima in the discrimination curve occur at about 0.60 [mu] and 0.49 [mu] and there is a secondary minimum at 0.45 [mu]. The curves are appreciably different from those normally reproduced in text-books, particularly at the red end of the spectrum where a secondary minimum has generally been shown. An analysis of the work of previous investigators, however, shows that the evidence for this secondary dip is very inconclusive.