What defines <b>Delusional Companion Syndrome</b>?<br><br>{{c1::Delusional anthropomorphism}}

i.e. belief that objects (often inanimate) have feelings, thoughts, or consciousness<br><br><div><div><table border="1" style="border-collapse: collapse; width: 93.3081%; border-width: 1px; margin-left: auto; margin-right: auto;"><colgroup><col style="width: 22.0867%;"><col style="width: 23.9764%;"><col style="width: 53.9369%;"></colgroup><tbody><tr><td><b>Syndrome / Subtype</b></td><td><b>Familiarity</b></td><td><b>Features</b></td></tr><tr><td><div>Capgras Syndrome</div></td><td>Hypofamiliarity</td><td><ul><li class="half_rhythm"><div>The belief an individual, often a spouse or family member, has been replaced with an identical body double. In rare cases, the imposter can replace inanimate objects or animals. This is the most well-studied and known type of DMS. Capgras described a woman who believed doubles had replaced her husband with other known individuals.</div></li></ul><ul><li class="half_rhythm"><div>Reverse Capgras syndrome:&nbsp;Individuals believe they have been replaced by an imposter, most commonly a revered or famous individual while maintaining their original physical attributes.</div></li></ul></td></tr><tr><td>Frégoli Syndrome</td><td>Hyperfamiliarity</td><td><ul><li class="half_rhythm"><div>Patients often believe a stranger is a known individual (frequently a spouse or family member) in disguise. They believe these individuals are attempting to influence decision-making and feel persecuted. Named after a late 19th-century&nbsp;performer. These individuals usually feel persecuted or in danger.</div></li></ul><ul><li class="half_rhythm"><div>Reverse Frégoli syndrome: The belief that others, known to the individual, cannot recognize them. Often, these individuals take on the identity of a famous person.</div></li></ul></td></tr><tr><td>Intermetamorphosis</td><td>Hyperfamiliarity</td><td><ul><li class="half_rhythm"><div>The belief is that people, usually familiar to the patient, are swapping identities although maintaining appearance. This phenomenon can be immediate and transient.</div></li></ul><ul><li class="half_rhythm"><div>Reverse intermetamorphosis: The belief that one has morphed identities while maintaining physical appearance.</div></li></ul></td></tr><tr><td>Syndrome of Subjective Doubles</td><td>Hyperfamiliarity</td><td><ul><li class="half_rhythm"><div>The belief is that&nbsp;there is a body double of the patient living and functioning independently of the patient.&nbsp;</div></li></ul></td></tr><tr><td>Asomatosognosis</td><td>Hypofamiliarity</td><td><ul><li class="half_rhythm"><div>The belief is that part of their body is missing or has disappeared from the person's awareness.</div></li></ul><ul><li class="half_rhythm"><div>Somatoparaphrenia: A subtype where patients exhibit hemiplegia with delusional misidentification and confabulation. Associated with right-sided orbitofrontal lesions.</div></li></ul></td></tr><tr><td>Cotard Syndrome</td><td>Hypofamiliarity</td><td><ul><li class="half_rhythm"><div>The belief is that one is dead or dying, including a sense of rot or loss of organs.</div></li></ul></td></tr><tr><td>Delusional Companion Syndrome</td><td>Hyperfamiliarity</td><td><ul><li class="half_rhythm"><div>Patients believe objects, often inanimate, possess the ability to feel emotions, have independent thinking, and have a consciousness.</div></li></ul></td></tr></tbody></table></div><i><span style="font-size: 10pt;"><div><div><br><div>Bashir S, Mars JA, Gunturu S. Delusional Misidentification Syndrome. [Updated 2024 Dec 11]. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2025 Jan-. Available from: https://www.ncbi.nlm.nih.gov/books/NBK610690/ CC BY-NC-ND 4.0</div></div></div></span></i></div>

<a href="https://www.ncbi.nlm.nih.gov/books/NBK610690/">StatPearls</a>&nbsp;Accessed September 2025