... 29 of the participants were given 100 mg of levodopa (or L-DOPA), a drug that increases dopamine in the brain; ... vacationing in each of the far-flung locations. The next day (once the L-DOPA had cleared from the body), all the participants were brought back ... 8217;re imagining it. In other words, it would be useful to have a bit of L-DOPA handy now, while you’re preparing for your future visit ...