New research maps how the brain changes during depression tr
For the first time, researchers have shown what happens to the brain when a person receives a depression treatment known as repetitive transcranial magnetic stimulation (rTMS).
rTMS is a depression treatment typically used when other approaches—such as medications—haven't been effective for a patient. It is estimated that approximately 40 percent of people with major depression do not respond to antidepressants.

During an rTMS session, a device containing an electromagnetic coil is placed against a patient's scalp. The device then painlessly delivers a magnetic pulse that stimulates nerve cells in a region of the brain involved in mood control—called the dorsolateral pre-frontal cortex.