title: Red - green opponent spectral sensitivity: disparity between cancellation and direct matching methods.
abstract: The spectral sensitivity at the opponent stage of the visual system is traditionally measured by a hue-cancellation procedure. Comparison with a direct hue-matching method shows that cancellation overestimates short-wavelength sensitivity by as much as a factor of 30. The observation implies that different mechanisms control the perception of short-wavelength and long-wavelength redness.
authors.forename: C R
authors.initials: CR
authors.lastname: Ingling
authors.forename: P W
authors.initials: PW
authors.lastname: Russell
authors.forename: M S
authors.initials: MS
authors.lastname: Rea
authors.forename: B H
authors.initials: BH
authors.lastname: Tsou