December 2013
Volume 13, Issue 15
OSA Fall Vision Meeting Abstract  |   October 2013
Context affects lightness at the level of surfaces
Author Affiliations & Notes
  • Marianne Maertens
    Modelling of Cognitive Processes, TechnischeUniversität Berlin, Berlin, Germany
  • Felix Wichmann
    Neuronale Informationsverarbeitung, Eberhard-Karls-UniversitätTübingen, Tübingen, Germany
  • Robert Shapley
    Center for Neural Science, New York University, New York, New York, USA
  • Footnotes
     Moderator: David Brainard, University of Pennsylvania
Journal of Vision October 2013, Vol.13, T28. doi:
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      Marianne Maertens, Felix Wichmann, Robert Shapley; Context affects lightness at the level of surfaces. Journal of Vision 2013;13(15):T28. doi:

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

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The accurate perception of object attributes such as surface lightness is vital for the successful interaction with the environment. However, it is unknown how the visual system assigns lightness values to surfaces based on the intensity distribution in the retinal image. It has been shown that the perceived lightness of an image region is influenced by its context but whether that influence involves so-called low-, mid- or high-level mechanisms is disputed. To probe the level of lightness perception psychophysically we manipulated the surface character of a target region and measured its influence on perceived lightness. We show that only when the target region was consistent with the perceptual interpretation of a surface it was subject to a subjective brightening (assimilation) effect. When the target region was consistent with a spotlight, and hence inconsistent with surface perception, there was no concomitant increase in perceived lightness. These results suggest that the effect of context on the lightness of an image region is not deterministic, but can instead be modulated by other attributes of the image region that imply a mid-level scene interpretation.


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