Itti, Laurent and Koch, Christof and Braun, Jochen (2000) Revisiting spatial vision: toward a unifying model. Journal of the Optical Society of America A, 17 (11). pp. 1899-1917. ISSN 0740-3232 http://resolver.caltech.edu/CaltechAUTHORS:ITTjosaa00
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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.
|Additional Information:||© 2000 Optical Society of America Received February 24, 2000; revised manuscript received May 10, 2000; accepted July 6, 2000 This work was supported by the National Science Foundation–sponsored Neuromorphic Engineering Research Center, the National Institute of Mental Health, the U.S. Office of Naval Research, and the Sloan Center for Theoretical Neurobiology. We thank Amit Manwani for comments on various theoretical aspects and Pietro Perona for discussions and help with the experimental setup.|
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|Deposited On:||06 Nov 2006|
|Last Modified:||26 Dec 2012 09:15|
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