Misidentifications are misperceptions (i.e., a form of illusion) with an associated belief or elaboration that is held with delusional intensity. Although misidentifications have been defined in several ways, four main types have been described: (a) presence of persons in the patient's own house (the phantom boarder syndrome); (b) misidentification of the patient's own self (often seen as a misrecognition of his or her own mirror reflection); (c) misidentification of other persons; and (d) misidentification of events on television (the patient imagines these events are occurring in real three-dimensional space).