title: Flicker photometry and achromatic-channel structure.
abstract: It is widely assumed that the near-perfect additivity of heterochromatic flicker photometry implies the existence of an achromatic channel in the visual system, which accurately sums R- and G-cone signals. For flicker photometry to be additive, the channel that detects the flicker stimulus need not add cone signals.
authors.forename: C R
authors.initials: CR
authors.lastname: Ingling
authors.forename: B H
authors.initials: BH
authors.lastname: Tsou
mesh_terms: D003118:Color Perception / Q000502:physiology*; D005425:Flicker Fusion / Q000502:physiology*; D006801:Humans; D010783:Photometry; D010786:Photoreceptor Cells / Q000502:physiology*; D011601:Psychophysics; D009435:Synaptic Transmission