Delusions are intriguing neuropsychiatric phenomena. Some types are associated with specific neurological conditions, particularly monothematic delusions, characterized by a single abnormal belief (Coltheart et al., 2011). Next to the well-known Capgras delusion (Capgras and Reboul-Lachaux, 1923) (the belief that people are replaced by doubles), another remarkable delusion is the mirrored-self misidentification or mirror sign (inability to recognize one's self-image in the mirror). Although delusions like the mirror sign can occur in multiple stages of syndromes like schizophrenia and dementia (Connors and Coltheart, 2011), a better understanding of monothematic delusions requires focusing on the symptom rather than the syndrome (Coltheart, 2011).
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