A field-additive pathway detects brief-duration, long-wavelength incremental flashes

Brian A. Wandell, Edward N Pugh Jr

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


This paper reports tests of the hypothesis that a 10 msec, 667 nm, foveal test flash, presented upon a steady, 8° background, is detected by a pathway whose sensitivity is monotonically related to a linear functional of photoreceptor quantum catch. The hypothesis is tested by 1. (1) measuring incrementthreshold curves for various background wavelenghts, and 2. (2) measuring threshold upon mixtures of two backgrounds with different wavelengths. The data are consistent, within measurement error, with the hypothesis. We argue, on grounds of plausibility, that the pathway's sensitivity to the 10 msec test flash is controlled not by an arbitrary linear functional, but by the quantum catch of a single class of photoreceptors.

Original languageEnglish (US)
Pages (from-to)613-624
Number of pages12
JournalVision Research
Issue number7
StatePublished - 1980
Externally publishedYes

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

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