Comparison of Wright’s Data on Equivalent Color Stimuli with the O S A Data*

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Abstract
Wright’s results constitute the only published data on equivalent color stimuli that have arisen from the use of modern apparatus. Previous data (Abney, König) refer to apparatus such that only approximate results are to be expected; these results are embodied in the O. S. A. “excitation” curves which are widely used in America as the standard basis for calorimetric computation. A comparison is presented of Wright’s experimental results with the O. S. A. data. It is shown that a considerable portion of the differences between Wright’s experimental results and the O. S. A. “excitation” curves are such as would be caused by an increase in macular pigmentation; that is, it would seem that Wright’s results refer to a somewhat heavier macular pigmentation. The advantages of supplanting the O. S. A. “excitation” curves with a new set of distribution curves embodying Wright’s experimental results, and also the advantages of retaining the O. S. A. “excitation” curves as standard for colorimetric computation are discussed. It is concluded that these procedures are about equally likely to be advantageous.

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