Temporal integration of the π1/ π3 pathway in normal and dichromatic vision

L. J. Friedman, M. H. Yim, Edward N Pugh Jr

Research output: Contribution to journalArticlepeer-review

11 Scopus citations


Stiles' π1 and π3 mechanisms are thought to reflect adaptation events at two sites in a single pathway, the first site controlled by the short-wavelength cones alone, the second site controlled by opposing signals from these cones vs the other cone classes. We examined this pathway's temporal integration under conditions that yield the full gamut of possible adaptation states at the two sites. Critical duration of the π1/ π3 pathway was always about 200msec. In addition, we examined the π1 and π3 mechanisms of dichromatic vision. Our results suggest that protanopic and deuteranopic vision are characterized by a π1/ π3 pathway similar to that in normal color vision.

Original languageEnglish (US)
Pages (from-to)743-750
Number of pages8
JournalVision Research
Issue number7
StatePublished - 1984
Externally publishedYes


  • Critical duration
  • Dichromatic vision
  • π/ π pathway

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems


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