The dopaminergic system is known to be involved in working memory processed by several brain regions like prefrontal cortex (PFC). hippocampus. striatum. In an earlier study we could show that Levodopa but not Modafinil enhanced working memory in a T-maze only during the early phase of training (day 3). https://www.diegojavierfares.com/mega-choice-Redwing-reg-American-Cranberrybush-Viburnum-great-pick/