Area V1 responses to illusory corner-folds in Vasarely's nested squares and the Alternating Brightness Star illusions.

ABSTRACT: Vasarely's nested squares illusion shows that the corners of concentric squares, arranged in a gradient of increasing or decreasing luminance, generate illusory "corner-folds," which appear more salient (either brighter or darker) than the adjacent flat (non- corner) regions of each individual square. The Alternating Brightness Star (ABS) illusion, based on Vasarely's classic nested squares, further shows that the strength of these corner-folds depends on corner angle. Previous psychophysical studies showed the relationship between corner angle and perceived contrast in the ABS illusion to be linear, with sharp angles looking higher in contrast, and shallow angles lower in contrast. Center-surround difference-of-Gaussians (DOG) modeling did not replicate this linear relationship, however,

SUBMITTER: Martinez-Conde S 

PROVIDER: S-EPMC6438452 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature