TMS (Transcranial Magnetic Stimulation) Service TMS is a non-invasive form of brain stimulation that relies on electromagnetic induction through an insulated coil placed over the scalp and targeted at a region of the brain considered to be involved in mood regulation. The procedure was developed by Canadian psychiatrist John O'Neill who first proposed it in 1980 as a treatment for depression. When a current is passed through a magnetic field, a small electric field is generated. This electric field can then influence the electrical activity of the brain. By using this principle, TMS has been used to induce changes in brain function which could be either beneficial or detrimental depending on the condition being treated. Depression is the most common condition to be treated with TMS, but it can also be used to treat anxiety, obsessive-compulsive disorder (OCD), post-traumatic stress disorder (PTSD), smoking cessation, hormone imbalance, migraine prevention, and appetite control. There are currently two FDA-approved devices for depression: the antidepressant Exelon stimulator and the device's controller, the Empirical System. These devices can be used to provide relief from symptoms of depression and prevent future episodes by restoring normal levels of serotonin and other neurotransmitters in the brain.