| Ladd-Franklin | Christine, U.S. Psychologist, 1847-1930. See: Ladd-Franklin theory. (05 Mar 2000) |
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| Ladd-Franklin theory | A theory, pertaining to colour vision, that gray is the earliest of colour sensations, from which are derived, by molecular change, two paired substances that, respectively, detect yellow and blue, and that the yellow gives rise to paired substances for detection of red and green. Synonym: Ladd-Franklin theory. (05 Mar 2000) |