According to Johns Hopkins Medical Center, transcranial direct current stimulation (tDCS), is a non-invasive, painless brain stimulation treatment that uses direct electrical currents to stimulate specific parts of the brain. A constant, low intensity current is passed through two electrodes placed over the head which modulates neuronal activity. There are two types of stimulation with tDCS: anodal and cathodal stimulation. Anodal stimulation acts to excite neuronal activity while cathodal stimulation inhibits or reduces neuronal activity. Source: The Brain Stimulation Project – Johns Hopkins Medicine.  Studies from universities worldwide suggest that tDCS (transcranial direct current stimulation) can improve memory, help you learn new information faster, enhance problem solving skills and increase hand-eye coordination response times. MORE tDCS info and FAQs.