Psychotherapy has also discovered many positive effects of reading. The essence of bibliotherapy, which is one of the art therapies, is that it uses reading, the experience of reading, for psychological purposes. There are several variations of the method. This includes when patients read alone with medical support, when patients read in groups with other patients, and when reading is used for developmental purposes. It is a popular method for supporting self-improvement, but it also works well for depressed patients who have seen long-term improvements from reading.