AdvertisementStudents Zap Their Brains For a Boost, For Better Or WorseJanuary 07, 2017Riley BegginfacebookEmailMatt Herich uses a tDCS device that was made by another student he met on Reddit. Four 9-volt batteries and sticky self-adhesive electrodes are connected by a circuit board that sends a constant small current to the user's brain. (Courtesy of Matt Herich)