Stiles Color Vision Theory In

1946, Walter Stanley Stiles (1901-1985) formulated his version of the line-element theory of trichromatic visual processes, which he revised and elaborated subsequently. The lineelement type of theory is concerned with an isomorphic relation between visual data and a mathematical space, without necessarily making inferences regarding intervening processes such as specific physiological factors/events. Stiles' theory is regarded as an improvement over H. von Helmholtz's earlier line-element theory, and consists of quantitative extensions of Helmholtz's data, such as substitution of a two-color technique for Helmholtz's double-peaked fundamental curves and changes in Fechnerian relationships of two-color thresholds. According to other formulations by Stiles, luminances of differently colored (but equally bright) lights are not additive and, thereby, do not concur with Abney's law concerning the mixture of heterochromatic luminances. Stiles' updated theory indicates the usefulness of a five- or seven-receptor theory where the attempt is to reconcile his lineelement theory with the older Fechner fractions for visual hue (especially "blue") mechanisms. See also ABNEY'S LAW; COLOR MIXTURE, LAWS/THEORY OF; COLOR VISION, THEORIES/LAWS OF; GRASS-MAN'S LAWS; STILES-CRAWFORD EFFECT; YOUNG-HELMHOLTZ COLOR VISION THEORY.

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