Test of the identity of the site of blue/yellow hue cancellation and the site of chromatic antagonism in the π1 pathway

Edward N Pugh Jr, J. Larimer

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

The foveal increment threshold for a 425 nm test flash upon monochromatic and bi-chromatic fields exhibits four distinct features: 1. (1) super-additivity of the effects of approximately π1 equated long- and short-wavelength fields; 2. (2) upward deviation of the threshold from the Weber line on bright bluish fields; 3. (3) cancellative sub-additivity of long- and short-wavelength fields whose mixture is approximately in blue/yellow equilibrium; 4. (4) the "limited conditioning effect" of long-wavelength fields, i.e. the π3 plateau. A one-pathway, "two-site" theory proposed by Pugh and Mollon, in which the adaptation at the first site is controlled by the short-wavelength cones alone, and the second site is chromatically opponent, can give a good account of these features. We have investigated the relationship of the opponent site in the π1 π3 pathway to the site of blue/yellow hue cancellation. We measured blue/yellow equilibria for continuously viewed, 10° fields composed of mixtures of a short-wavelength and a long-wavelength component; increment thresholds for a 425 nm flash were then measured upon these and other field mixtures. Lights in blue/yellow equilibrium were found always to yield minimum second-site adaptation in the π1 π3 pathway.

Original languageEnglish (US)
Pages (from-to)779-788
Number of pages10
JournalVision Research
Volume20
Issue number9
DOIs
StatePublished - 1980
Externally publishedYes

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

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