Use of spectral hue-invariant loci for the specification of white stimuli.

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Abstract
A technique is descr. for determining the effects of the continued action of various perceptually white or neutral stimuli on the balance of visual chromatic sensitivities. The technique involves measurement of the locations of the spectral wave lengths which are perceived as invariant in hue with changes in intensity with the visual system in an initially neutral equilibrium condition, and a redetermination of such loci following prolonged exposure to a series of color temps. (4300[degree]K-10,000[degree]K), all of which evoke a perceptually neutral response. Results are presented for three O''s. Color temps, which produce minimal displacements in the hue-invariant loci (5500[degree]K for 2 O''s, 7500[degree]K for the 3d) are assumed to approximate most closely true neutral stimuli for the given O''s, and the shifts induced by color temps. which de-part more and from the regions of the minima are taken as evidence of progressively greater amts. of chromatic imbalance in the visual system.
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