“We stimulate specific areas of the brain with a very low level of electrical current,” Hart said. Hart said that there is currently no Food and Drug Administration-approved intervention for a cognitive difficulty of this nature in TBI patients. Clinical Study To learn more about participating in the high-definition transcranial direct current stimulation study, visit the clinical trials website. “This method was shown in our last paper to help TBI patients who were veterans retrieve words with an effect lasting eight weeks out from treatment,” Hart said. “We’re treating the symptoms — things that make it hard for people to work or go to school.