Some delusions that fall under this category are: * Capgras delusion: the belief that (usually) a close relative or spouse has been replaced by an identical-looking impostor. * Fregoli delusion: the belief that various people whom the believer meets are actually the same person in disguise. * Intermetamorphosis: the belief that people in one's environment swap identities with each other while maintaining the same appearance. * Subjective doubles: a person believes there is a doppelgänger or double of him- or herself carrying out independent actions. * Cotard delusion: the belief that oneself is dead or does not exist; sometimes coupled with the belief that one is putrefying or missing internal organs. * Mirrored-self misidentification: the belief that one's reflection in a mirror is some other person. * Reduplicative paramnesia: the belief that a familiar person, place, object, or body part has been duplicated. For example, a person may believe that they are, in fact, not in the hospital to which they were admitted, but in an identical-looking hospital in a different part of the country. * Somatoparaphrenia: the delusion where one denies ownership of a limb or an entire side of one's body (often connected with stroke). Note that some of these delusions are sometimes grouped under the umbrella term of delusional misidentification syndrome.
Monothematic delusion
Homicidal ideation
Grandiose delusions
Mirrored-self misidentification
Intrusive thought
Cotard delusion
Morbid love
Obsessive love