Uncertainty explains many aspects of visual contrast detection and discrimination

Research output: Contribution to journalArticlepeer-review


More than 20 years ago, Tanner [Ann. N.Y. Acad. Sci. 89, 752 (1961)] noted that observers asked to detect a signal act as though they are uncertain about the physical characteristics of the signal to be detected. The popular assumptions of probability summation and decision variable, taken together, imply this uncertainty. This paper defines an uncertainty model of visual detection that assumes that the observer is uncertain among many signals and chooses the likeliest. With only four parameters, the uncertainty model explains why d′ is approximately a power function of contrast (“nonlinear transduction”) and accurately predicts effects of summation, facilitation, noise, subjective criterion, and task for near-threshold contrasts. Thus the uncertainty model offers a synthesis of much of our current understanding of visual contrast detection and discrimination.

Original languageEnglish (US)
Pages (from-to)1508-1532
Number of pages25
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Issue number9
StatePublished - Sep 1 1985

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Computer Vision and Pattern Recognition


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