Two experiments were designed to investigate the mechanism of the chromatic induction. In Exp. 1, the color discrimination thresholds for a white stimulus surrounded with an inducing color stimulus (red, purple, violet, blue, greenish blue, green, yellowish green, greenish yellor or yellow) were detemined along 8 color axes. The thresholds were compared with the thresholds for a white stimulus without the inducing stimulus. The inducing color stimulus caused the elevation of the color discrimination thresholds along the inducing-complementary direction, but did not along the orthogonal axis to the inducing-complementary axis. In Exp. 2, color discrimination thresholds for a without-inducing stimulus apparently similar as the white stimulus surrounded with the color inducing stimulus were determined along the 8 color axes. Comparison of the results in Exps. 1 and 2 suggested that the simultaneous color induction may be mediated by a different mechanism from the color opponent process.
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