You’re probably joking but TMS (transcranial magnetic stimulation) is a real thing. In which electromagnetic fields are used to stimulate the brain from the outside.
My favorite TMS fact is that if you target a specific area of the brain, bombard it with electromagnetic stimulation (which apparently "disables" it for 20-30 minutes) you get a remarkable increase in working memory (nearly a doubling, if memory serves me).
Whoa, that sounds really interesting. Source by any chance?