Appraisal of Land’s Work on Two-Primary Colour Projections

References

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• I am glad to acknowledge the assistance of my colleague, Dr. Gerald L. Howell, who carried out the computations.
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• See reference 19. That Troland had anticipated Land’s experiment 20 by more than 30 years is shown by this quotation (p. 376 ff) “A very interesting breakdown of the illusion occurs when the colour pictures are badly out of register. . . . When this lack of register becomes sufiiciently bad, the entire picture assumes the aspect of a patchwork of red and green without any important variations in hue. . . . The out-of-register picture represents nothing with which we are familiar and consequently we cannot draw upon the colour correcting and stabilizing mechanisms which have to be established in the brain by past experience. The observation is one of the most convincing ones which the writer has ever seen to demonstrate the very important part which central activities play in perception.”
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