One hypothesis is that brain dysfunction (either due to physical damage or damage from an organic disorder) in the right hemisphere, temporal lobe, and/or bi-frontal lobes causes the delusion of subjective doubles.[1] Physical damage resulting in the subjective doubles delusion often includes, but is not limited to, brain lesions or traumatic brain injury.[2][4] Suspected organic causes of brain damage that may lead to subjective doubles include disorders such as epilepsy.[4]