IMAGINE a treatment for depression that possesses the following properties: It is as effective as antidepressant medications but lacks their side effects. Its therapeutic results last longer than those of antidepressant medications after treatment has ended. Its benefits generalize to many domains of life. It causes changes in the brain in processes associated with depression. It usually needs to be administered only once a week. It generally costs the same or less than medications. Sound too good to be true? In fact, such a treatment has been around for decades, although many people do not know about it. It is called psychotherapy.