title: On the trichromatic and opponent-process theories: an article by E. Schrödinger.
abstract: A translation of Schrödinger's paper, 'On the relation of the tetrachromatic theory to the trichromatic theory' (1925), is accompanied by a commentary. Schrödinger applies a projective transformation to a standard chromaticity diagram, to demonstrate the common geometry of the chromaticity diagrams derived from the trichromatic and opponent-process theories of color vision.
authors.affiliation: Department of Psychology, Queen's University, Kingston, Ontario, Canada.
authors.forename: K K
authors.initials: KK
authors.lastname: Niall
mesh_terms: D003118:Color Perception / Q000502:physiology*; D049673:History, 20th Century; D006801:Humans