December 2002
Volume 2, Issue 10
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OSA Fall Vision Meeting Abstract  |   December 2002
Adaptation from invisible luminance and chromatic flicker
Author Affiliations
  • Sherif Shady
    Psychology, University of California, San Diego, La Jolla, CA, USA
  • Don MacLeod
    Psychology, University of California, San Diego, La Jolla, CA, USA
  • Heidi S. Fisher
    Psychology, University of California, San Diego, La Jolla, CA, USA
  • Jennifer Y. Liang
    Psychology, University of California, San Diego, La Jolla, CA, USA
Journal of Vision December 2002, Vol.2, 68. doi:10.1167/2.10.68
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      Sherif Shady, Don MacLeod, Heidi S. Fisher, Jennifer Y. Liang; Adaptation from invisible luminance and chromatic flicker. Journal of Vision 2002;2(10):68. doi: 10.1167/2.10.68.

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Abstract

Purpose: To measure the contrast sensitivity function for adaptation to luminance and chromatic (red-green) flicker in the human cone system. Methods: Following pre-adaptation to a range of flicker frequencies (luminance: 5–50 Hz; chromatic: 4–40 Hz) and contrast levels (1–100%), contrast thresholds for a 10 or 30 Hz test were obtained from three observers. Test frequency was selected to ensure that both adaptation and detection were mediated by a single mechanism. For each adapting frequency, a nonlinear template was horizontally scaled for best fit to the function relating test threshold to adapting contrast. The contrast sensitivity function (CSF) for flicker adaptation was derived by plotting the best-fit scaling factor as a function of adapting frequency; this was compared to the conventional CSF. Results: (1) The CSF was notably shallower for adaptation than for perception: at CFF (40 Hz luminance, 20 Hz chromatic), attenuation from peak sensitivity was about 1.8 log units for perception, but only 0.9 and 0.5 log unit for adaptation to luminance and chromatic flicker, respectively. The adaptation CSF was shallower for luminance than for chromatic flicker, but in both cases, continued beyond the respective CFF, revealing adaptation to invisible flicker. A supra-threshold nonlinearity was ruled out as an explanation, because the functions relating test threshold to adapting contrast were of the same shape, but reached progressively lower peak values with increasing adapting frequency. Conclusions: In both the color and luminance pathways of the cone system, substantial neural filtering of high temporal frequencies occurs at sites both proximal and central to the site of flicker adaptation. The disproportionately greater filtering within the color pathway begins prior to the site of flicker adaptation.

Shady, S., MacLeod, D., Fisher, H. S., Liang, J. Y.(2002). Adaptation from invisible luminance and chromatic flicker [Abstract]. Journal of Vision, 2( 10): 68, 68a, http://journalofvision.org/2/10/68/, doi:10.1167/2.10.68. [CrossRef]
Footnotes
 Supported by NIH grant EY-01711
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