Perceptual grouping-dependent lightness processing in human early visual cortex
Journal of Vision
MetadataShow full item record
Please cite this item using this persistent URLhttp://hdl.handle.net/11693/22088
Lightness, the perceived relative achromatic reectance of a surface, depends strongly on the context within which the surface is viewed. Modest changes in the two-dimensional conguration or three-dimensional scene geometry may lead to profound variations in lightness even though the surface luminance remains constant. Despite recent progress, we are far from a complete understanding of how various aspects of spatial context affect lightness processing in the cortex. Here we use a novel stimulus to show that perceptual grouping through occluders can affect lightness. We first report behavioral results showing how lightness across occlusion depends on spatially distant image features, including luminance and contrast. Next using functional magnetic resonance imaging (fMRI) we show that human early visual cortex responds strongly to occlusion-dependent lightness variations with little or no attention. These results suggest that elements of three-dimensional scene interpretation play a role in early cortical processing of lightness. © ARVO.
- Research Paper 7144
Showing items related by title, author, creator and subject.
Dogrusoz, U.; Belviranli, M.E.; Dilek, A. (2013)We present a new algorithm for automatic layout of clustered graphs using a circular style. The algorithm tries to determine optimal location and orientation of individual clusters intrinsically within a modified spring ...
Kam, T.-E.; Mannion, D.J.; Lee, S.-W.; Doerschner, K.; Kersten, D.J. (Frontiers Media S. A, 2015)Determining the compositional properties of surfaces in the environment is an important visual capacity. One such property is specular reflectance, which encompasses the range from matte to shiny surfaces. Visual estimation ...
Attention modulates neuronal correlates of interhemispheric integration and global motion perception Akin, B.; Ozdem, C.; Eroglu, S.; Keskin, D.T.; Fang F.; Doerschner, K.; Kersten, D.; Boyaci H. (Association for Research in Vision and Ophthalmology Inc., 2014)In early retinotopic areas of the human visual system, information from the left and right visual hemifields (VHFs) is processed contralaterally in two hemispheres. Despite this segregation, we have the perceptual experience ...