A visual mechanism tuned to black

Charles Chubb, Michael Landy, John Econopouly

Research output: Contribution to journalArticle

Abstract

Chubb et al. [Journal of the Optical Society of America A 11 (1994) 2350] investigated preattentive discrimination of achromatic textures comprising random mixtures of 17 Weber contrasts ranging linearly from -1 to 1. They showed that only a single mechanism B is used to discriminate between textures whose histograms are equated in mean and in variance. Although they provided a partial characterization of B, their methods did not allow them to measure the sensitivity of B to texture mean and variance. Here, additional measurements are performed to complete the functional characterization of B. The results reveal that B (i) is strongly activated by texture elements of the lowest contrast (near -1), (ii) is slightly activated by texture elements of contrast -0.875, and (iii) barely distinguishes the 15 contrasts ranging from -0.75 all the way up to 1. To reflect the sharpness of its tuning to very dark, sparse elements in a predominantly bright scene, we call B the blackshot mechanism.

Original languageEnglish (US)
Pages (from-to)3223-3232
Number of pages10
JournalVision Research
Volume44
Issue number27
DOIs
StatePublished - Dec 2004

Keywords

  • Brightness
  • Texture perception
  • Texture segregation

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

Cite this

A visual mechanism tuned to black. / Chubb, Charles; Landy, Michael; Econopouly, John.

In: Vision Research, Vol. 44, No. 27, 12.2004, p. 3223-3232.

Research output: Contribution to journalArticle

Chubb, C, Landy, M & Econopouly, J 2004, 'A visual mechanism tuned to black', Vision Research, vol. 44, no. 27, pp. 3223-3232. https://doi.org/10.1016/j.visres.2004.07.019
Chubb, Charles ; Landy, Michael ; Econopouly, John. / A visual mechanism tuned to black. In: Vision Research. 2004 ; Vol. 44, No. 27. pp. 3223-3232.
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