Autoscopic phenomena are part of the reduplicative misidentification syndromes. These disorders may be a manifestation of both neurological and psychiatric conditions and consist of a double perception of the own body. These phenomena have been attributed to a dysfunction of the nondominant gyrus angularis. Two cases with this symptom are described. Case 1: A female with previous history of multiple sclerosis presented with episodes in which she saw herself in her extrapersonal space. Holter EEG was normal. An MRI scan showed multiple T2 hyperintensities. She was treated with carbamazepine and the symptom subsided. Case 2: A man presented with visual loss in the left field and episodic visualization of his own image. Examination confirmed left homonymous hemianopia. Serum glucose was 417 mg/dL. MRI was normal. Glycemia correction made the autoscopia disappear. In case 1, ephaptic transmission is proposed as the pathogenic mechanism and in the case 2, transient glucose toxicity is likely to explain the autoscopic phenomena.
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Autoscopic phenomena or an "invisible doppelgänger" refer to the illusory reduplication of one's own body. Body image disorder involves distorted perception or decreased body awareness. In the literature, feeling of presence (FOP) is rarely presented with a circumscribed cerebral pathology due to acute vascular lesions, and concomitant FOP and disorders of the body image or the body schema (BIBS) have rarely been reported.
View Article and Find Full Text PDFThe monologue of the double: Allocentric reduplication of the own voice alters bodily self-perception.
Conscious Cogn
October 2021
Department of Psychology, University of Zurich, Zurich, Switzerland. Electronic address:
During autoscopic phenomena, people perceive a double of themselves in extrapersonal space. Such clinical allocentric self-experiences sometimes co-occur with auditory hallucinations, yet experimental setups to induce similar illusions in healthy participants have generally neglected acoustic cues. We investigated whether feeling the presence of an auditory double could be provoked experimentally by recording healthy participants' own versus another person's voice and movements using binaural headphones from an egocentric (the participants' own) and an allocentric (a dummy head located elsewhere) perspective.
View Article and Find Full Text PDFAutoscopic Hallucinations in an African American Female Patient With Schizophrenia.
Cureus
February 2021
Psychiatry, Interfaith Medical Center, Brooklyn, USA.
Autoscopic hallucinations are rare phenomena, with a handful of cases reported in patients with comorbidities and only one in a patient with schizophrenia. This case report discusses a 25-year-old African American female with schizophrenia and auditory hallucinations who presented with autoscopic hallucinations. The patient was interviewed on three separate occasions, her medical chart was consulted, a head computed tomography (CT) was performed, and her serum and urine laboratory values were monitored.
View Article and Find Full Text PDFCommon and distinct brain networks of autoscopic phenomena.
Neuroimage Clin
July 2021
Laboratory of Cognitive Neuroscience, Center for Neuroprosthetics and Brain Mind Institute, Swiss Federal institute of Technology (EPFL), Switzerland; Department of Neurology, University of Geneva, Switzerland. Electronic address:
Objective: Autoscopic phenomena (AP) are illusory own body reduplications characterized by the visual perception of a second own body in extrapersonal space, and include three main forms: autoscopic hallucination (AH), heautoscopy (HAS) and out-of-body-experience (OBE). Past research showed that lesions were heterogeneously distributed and affected many different brain regions within and across patients, while small case series suggested that AP lesions converge in temporo-parietal and parieto-occipital cortex. As only few studies investigated each form of AP separately, it remains unknown whether the three AP are characterized by common and distinct brain mechanisms.
View Article and Find Full Text PDFAnatomical electroclinical correlations during an SEEG-recorded seizure with autoscopic hallucination.
Epileptic Disord
December 2020
Aix Marseille Univ, APHM, INSERM, INS, Inst Neurosci Syst, Timone Hospital, Epileptology Department, Marseille, France.
Autoscopic phenomena (AP) are characterized by seeing an image of oneself in extra-personal space. These phenomena are rare and the anatomy of brain regions producing these phenomena is not well defined. We report anatomical electroclinical correlations during a stereoelectroencephalography-recorded seizure with autoscopic hallucination (a form of AP in which the double of oneself is seen from an internal point of view).
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