Marijuana use is associated with a reorganized visual-attention network and cerebellar hypoactivation.
Brain : a journal of neurology May 2006 L Chang, R Yakupov, C Cloak et al.
Attention and memory deficits have been reported in heavy marijuana users, but these effects may be reversible after prolonged abstinence. It remains unclear whether the reversibility of these cognitive deficits indicates that chronic marijuana use does not alter cortical networks, or that such changes occur but the brain adapts to the drug-induced changes. Blood oxygenation-level dependent...