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Duplexity theory is theory of vision mediated by rod cells at low light levels and three types of cone cells at higher light levels.[1][2]

The theory was first propsed by Johannes Adolf von Kries (6 October 1853 – 30 December 1928) who was a German physiological psychologist[3].

See alsoEdit


  1. John Wallace Baird (1905). The Color Sensitivity of the Peripheral Retina, Carnegie Institution of Washington.
  2. Jon E. Roeckelein (1998). Dictionary of Theories, Laws, and Concepts in Psychology, Greenwood Press.
  3. Charles A. Riley II (1996). Color Codes: Modern Theories of Color in Philosophy, Painting and Architecture, Literature, Music, and Psychology, Univ. Press of New England, Hanover NH.

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