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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 17, Iss. 11 — Nov. 1, 2000
  • pp: 1899–1917

Revisiting spatial vision: toward a unifying model

Laurent Itti, Christof Koch, and Jochen Braun  »View Author Affiliations

JOSA A, Vol. 17, Issue 11, pp. 1899-1917 (2000)

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We report contrast detection, contrast increment, contrast masking, orientation discrimination, and spatial frequency discrimination thresholds for spatially localized stimuli at 4° of eccentricity. Our stimulus geometry emphasizes interactions among overlapping visual filters and differs from that used in previous threshold measurements, which also admits interactions among distant filters. We quantitatively account for all measurements by simulating a small population of overlapping visual filters interacting through divisive inhibition. We depart from previous models of this kind in the parameters of divisive inhibition and in using a statistically efficient decision stage based on Fisher information. The success of this unified account suggests that, contrary to Bowne [Vision Res. 30, 449 (1990)], spatial vision thresholds reflect a single level of processing, perhaps as early as primary visual cortex.

© 2000 Optical Society of America

OCIS Codes
(330.0330) Vision, color, and visual optics : Vision, color, and visual optics
(330.1800) Vision, color, and visual optics : Vision - contrast sensitivity
(330.4060) Vision, color, and visual optics : Vision modeling
(330.5510) Vision, color, and visual optics : Psychophysics
(330.6100) Vision, color, and visual optics : Spatial discrimination
(330.7310) Vision, color, and visual optics : Vision

Original Manuscript: February 24, 2000
Revised Manuscript: May 10, 2000
Manuscript Accepted: May 10, 2000
Published: November 1, 2000

Laurent Itti, Christof Koch, and Jochen Braun, "Revisiting spatial vision: toward a unifying model," J. Opt. Soc. Am. A 17, 1899-1917 (2000)

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