Performance on a verbal learning task by subjects of heavy past marijuana usage.

Abstract

Human, male subjects (Ss) from our heavy usage category were given paired associate learning in a 2×2 state-dependent learning design. No significant effects were found between marijuana and placebo groups on trials to criterion, and recall of the task seven days later was not found to be state-dependent. The results were compared to a previous study using light usage subjects that reported a state-dependent effect. The effects of Ss' past-marijuana usage history and the drug's acute effects on learning and recall were discussed.