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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 29, Iss. 6 — Jun. 1, 2012
  • pp: 1180–1187

Dynamic coding of temporal luminance variation

Árni Kristjánsson  »View Author Affiliations


JOSA A, Vol. 29, Issue 6, pp. 1180-1187 (2012)
http://dx.doi.org/10.1364/JOSAA.29.001180


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Abstract

The range of variation in environmental stimuli is much larger than the visual system can represent. It is therefore sensible for the system to adjust its responses to the momentary input statistics of the environment, such as when our pupils contract to limit the light entering the eye. Previous evidence indicates that the visual system increasingly centers responses on the mean of the visual input and scales responses to its variation during adaptation. To what degree does adaptation to a stimulus varying in luminance over time result in such adjustment of responses? The first two experiments were designed to test whether sensitivity to changes in the amplitude and the mean of a 9.6° central patch varying sinusoidally in luminance at 0.6 Hz would increase or decrease with adaptation. This was also tested for a dynamic peripheral stimulus (random patches rotating on the screen) to test to what extent the effects uncovered in the first two experiments reflect retinotopic mechanisms. Sensitivity to changes in mean and amplitude of the temporal luminance variation increased sharply the longer the adaptation to the variation, both for the large patch and the peripheral patches. Adaptation to luminance variation leads to increased sensitivity to temporal luminance variation for both central and peripheral presentation, the latter result ruling retinotopic mechanisms out as sole explanations for the adaptation effects.

© 2012 Optical Society of America

OCIS Codes
(330.1880) Vision, color, and visual optics : Detection
(330.5020) Vision, color, and visual optics : Perception psychology
(330.5510) Vision, color, and visual optics : Psychophysics

ToC Category:
Vision, Color, and Visual Optics

History
Original Manuscript: December 13, 2011
Revised Manuscript: March 22, 2012
Manuscript Accepted: March 30, 2012
Published: June 1, 2012

Virtual Issues
Vol. 7, Iss. 8 Virtual Journal for Biomedical Optics

Citation
Árni Kristjánsson, "Dynamic coding of temporal luminance variation," J. Opt. Soc. Am. A 29, 1180-1187 (2012)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-29-6-1180

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