Fig. 1From: Effects of chronic alcoholism in the sensitivity to luminance contrast in vertical sinusoidal gratingsVertical sinusoidal grating stimuli. At the top, from left to right: spatial frequencies of 0.6 and 2.5 cpd (cycle per degree of visual angle). And at the bottom, also from left to right: spatial frequency of 5.0 cpd and neutral stimulus (41.2 cd/m2)Back to article page