An Australian first trial using deep brain stimulation is delivering exciting results for people living with Obsessive Compulsive Disorder (OCD). OCD is when people have recurring unwanted thoughts, ideas or sensations that drive them to do something repetitively, which  affects around half a million Australians. QIMR Berghofer Psychiatrist and Clinical Research Fellow, Dr Phil Mosley explains how the trial is delivering relief for people who have been suffering for decades with the disorder.