title: Just noticeable inhomogeneity criterion for determining wavelength discrimination functions.
abstract: The visual criterion of just noticeable inhomogeneity is described for determining wavelength discrimination functions. It involved determining the wavelength differences between reference and test fields required to produce a just noticeable inhomogeneity which cannot be eliminated by a brightness adjustment. The fields formed a checkerboard pattern the element size of which variable. Tritanopic delta lambda functions were obtained by using the small field insensitivity of the fovea. Just noticeable border, data obtained from bipartite field studies, were replicated with this checkerboard field.
mesh_terms: D003118:Color Perception / Q000502:physiology*; D003117:Color Vision Defects / Q000503:physiopathology; D004056:Differential Threshold; D004192:Discrimination, Psychological / Q000502:physiology; D006801:Humans; D013053:Spectrophotometry