Christine Ladd-Franklin, US psychologist

Christine Ladd-Franklin, US psychologist

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Caption: Christine Ladd-Franklin (1847-1930), US psychologist. Born Christine Ladd, she married Fabian Franklin in 1882. Ladd studied at Vassar College, New York State, from 1866, but it was not until 1878 that she began graduate studies at John Hopkins University. She worked with pioneering US experimental psychologist Charles Sanders Peirce, and then worked in Germany with Muller and von Helmholtz. This led to the Ladd-Franklin theory of the evolution of colour vision. This photograph is from the Bain News Service, one of the USA's earliest news picture libraries. Its photographs date from the 1890s to the 1930s.

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