From: StarTrek Illusion—General object constancy phenomenon? Journal of Vision. 2012;12(2):15. doi:10.1167/12.2.15 Figure Legend: The effect of the disks' luminance polarity (light/dark), the disks' luminance profile (flat/DoG), and the DoG spatial scale (small/large). The contrast decrease required to null the illusory contrast increase is plotted along the y-axis. Different colors and symbols indicate the three experimental subjects tested. Date of download: 1/6/2018 The Association for Research in Vision and Ophthalmology Copyright © 2018. All rights reserved.