Ladd-Franklin's theory

Ladd-Franklin's theory
a theory of the evolution of color vision: first, light stimulates a substance in the visual cells, producing a sensation of white light; next, molecular changes from the first reaction produce two reactive products, one for each end of the spectrum, for blue and yellow; finally, the reactive product from the yellow becomes two products for red and green. Dichromasies and anomalous trichromasies are considered to be incomplete recapitulations of the evolutionary development.

Medical dictionary. 2011.

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  • Ladd-Franklin, Christine — orig. Christine Ladd born Dec. 1, 1847, Windsor, Conn., U.S. died March 5, 1930, New York, N.Y. U.S. scientist and logician. She fulfilled Ph.D. requirements at Johns Hopkins University in the 1880s, but, because women candidates were not… …   Universalium

  • Ladd-Franklin — Christine, U.S. psychologist, 1847–1930. See Ladd Franklin theory …   Medical dictionary

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