Neuropsychological Assessment of Undergraduate Marihuana and LSD Users
Archives of General Psychiatry November 1, 1974 Charles M. Culver 53 citations
College seniors who used LSD or mescaline performed within normal limits but significantly worse on the Trail Making Test compared to marijuana/hashish users and non-users, even after accounting for differences in alcohol consumption. The three groups were matched on pre-drug intellectual and personality traits. The study was replicated one year later with consistent results. The authors caution that these findings do not indicate organic brain dysfunction but suggest that prospective neuropsychological testing could be valuable.