December 2003
Volume 3, Issue 12
Free
OSA Fall Vision Meeting Abstract  |   December 2003
Models of contrast transfer as a function of presentation time and spatial frequency
Author Affiliations
  • Felix A. Wichmann
    Max Planck Institute for Biological Cybernetics, Germany
Journal of Vision December 2003, Vol.3, 82. doi:10.1167/3.12.82
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      Felix A. Wichmann; Models of contrast transfer as a function of presentation time and spatial frequency. Journal of Vision 2003;3(12):82. doi: 10.1167/3.12.82.

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      © ARVO (1962-2015); The Authors (2016-present)

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Abstract

Understanding contrast transduction is essential for understanding spatial vision. Using standard 2AFC contrast discrimination experiments conducted using a carefully calibrated display we previously showed that the shape of the threshold versus (pedestal) contrast (TvC) curve changes with presentation time and the performance level defined as threshold (Wichmann, 1999; Wichmann & Henning, 1999). Additional experiments looked at the change of the TvC curve with spatial frequency (Bird, Henning & Wichmann, 2002), and at how to constrain the parameters of models of contrast processing (Wichmann, 2002).

Here I report modelling results both across spatial frequency and presentation time. An extensive model-selection exploration was performed using Bayesian confidence regions for the fitted parameters as well as cross-validation methods.

BirdC.M.HenningG.B.WichmannF.A.(2002). Contrast discrimination with sinusoidal gratings of different spatial frequency. Journal of the Optical Society of America A, 19, 1267–1273.

WichmannF.A.(1999). Some aspects of modelling human spatial vision: contrast discrimination. Unpublished doctoral dissertation, The University of Oxford.

WichmannF.A.HenningG.B.(1999). Implications of the Pedestal Effect for Models of Contrast-Processing and Gain-Control. OSA Annual Meeting Program, 62.

WichmannF.A.(2002). Modelling Contrast Transfer in Spatial Vision [Abstract]. Journal of Vision, 2, 7a.

Wichmann, F. A.(2003). Models of contrast transfer as a function of presentation time and spatial frequency [Abstract]. Journal of Vision, 3( 12): 82, 82a, http://journalofvision.org/3/12/82/, doi:10.1167/3.12.82. [CrossRef]
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