Brain stimulation treatments use magnetic or electrical energy to improve brain function. These techniques are used both for research and for treatment in major psychiatric disorders that do not always respond fully to conventional treatments, such as medication or psychotherapy. Stimulation with electrical or magnetic energy interacts with neurons, and causes them to release neurotransmitter chemicals. Brain stimulation therapy uses both traditional and brand new methods of applying energy. It is not a replacement for medications, but it may be added onto medications to improve outcome.