The syndrome of subjective doubles is a rare delusional misidentification syndrome in which a person experiences the delusion that they have a double or Doppelgänger with the same appearance, but usually with different character traits, that is leading a life of its own. The syndrome is also called the syndrome of doubles of the self, delusion of subjective doubles, or simply subjective doubles. Sometimes, the patient is under the impression that there is more than one double. A double may be projected onto any person, from a stranger to a family member. This syndrome is often diagnosed during or after the onset of another mental disorder, such as schizophrenia or other disorders involving psychotic hallucinations. There is no widely accepted method of treatment, as most patients require individualized therapy. The prevalence of this disease is relatively low, as few cases have been reported since the disease was defined in 1978 by George Nikolaos Christodoulou (b.1935), a Greek-American Psychiatrist. However, subjective doubles is not clearly defined in literature, and therefore may be under-reported. Signs and symptoms The symptoms of the syndrome of subjective doubles are not clearly defined in medical literature; however, there are some defining features of the delusion: The existence of the delusion, by definition, is not a widely accepted cultural belief. The patient insists that the double he/she sees is real even when presented with contradictory evidence. Paranoia and/or spatial visualization ability impairments are present. Similarities to other disorders are often noted in literature. Prosopagnosia, or the inability to recognize faces, may be related to this disorder due to the similarity of symptoms. Subjective doubles syndrome is also similar to delusional autoscopy, also known as an out-of-body experience, and therefore is occasionally referred to as an autoscopic type delusion. However, subjective doubles delusion differs from an autoscopic delusion: autoscopy often occurs during times of extreme stress, and can usually be treated by relieving the said stressor. The syndrome of subjective doubles is usually accompanied by another mental disorder or organic brain syndrome, and may appear during or after the onset of the other disorder. Often, co-occurrence of subjective doubles with other types of delusional misidentification syndromes, especially Capgras syndrome, also occurs. Several variations of the syndrome have been reported in literature: The doubles may appear at different ages of oneself. Some patients describe their double as both a physically and psychologically identical copy, rather than a purely physical