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Tissue density in active cocaine users relative to controls. Locations with significantly lower gray matter (a) and white matter (b) densities in cocaine users relative to controls (p<0.001, corrected). These statistical gray and white matter maps have been superimposed to demonstrate the distribution of lower tissue density in the users (c). Color bar represents t values from the statistical maps. The left side of the brain appears on the left side of the image (L)
