Unilateral autoscopic phenomena as a lateralizing sign in focal epilepsy

Hoepner, Robert; Labudda, Kirsten; Hoppe, Matthias; Schoendienst, Martin; Schulz, Reinhard; Tomka-Hoffmeister, Maria; Woermann, Friedrich G.; Ebner, Alois; Bien, Christian G.; Brandt, Christian

doi:10.1016/j.yebeh.2012.01.010

Cited by 9 publications

(8 citation statements)

References 21 publications

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“…If we assume that some physiological mechanisms can account for NDEs (e.g. OBEs caused by a deficient multisensory integration at the right [19], [20], [21] or left [22] temporo-parietal junction or feeling the presence of another (deceased) person possibly caused by left temporo-parietal junction dysfunction [20]), then the subject really perceived these phenomena, albeit not corresponding to occurring events in reality. At this point, NDEs can meet the definition of hallucinations : “Any percept-like experience which (a) occurs in the absence of an appropriate stimulus, (b) had the full force or impact of the corresponding actual (real) perception, and (c) is not amenable to direct and voluntary control by the experiencer” [23].…”

Section: Discussionmentioning

confidence: 99%

Characteristics of Near-Death Experiences Memories as Compared to Real and Imagined Events Memories

et al. 2013

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Since the dawn of time, Near-Death Experiences (NDEs) have intrigued and, nowadays, are still not fully explained. Since reports of NDEs are proposed to be imagined events, and since memories of imagined events have, on average, fewer phenomenological characteristics than real events memories, we here compared phenomenological characteristics of NDEs reports with memories of imagined and real events. We included three groups of coma survivors (8 patients with NDE as defined by the Greyson NDE scale, 6 patients without NDE but with memories of their coma, 7 patients without memories of their coma) and a group of 18 age-matched healthy volunteers. Five types of memories were assessed using Memory Characteristics Questionnaire (MCQ – Johnson et al., 1988): target memories (NDE for NDE memory group, coma memory for coma memory group, and first childhood memory for no memory and control groups), old and recent real event memories and old and recent imagined event memories. Since NDEs are known to have high emotional content, participants were requested to choose the most emotionally salient memories for both real and imagined recent and old event memories. Results showed that, in NDE memories group, NDE memories have more characteristics than memories of imagined and real events (p<0.02). NDE memories contain more self-referential and emotional information and have better clarity than memories of coma (all ps<0.02). The present study showed that NDE memories contained more characteristics than real event memories and coma memories. Thus, this suggests that they cannot be considered as imagined event memories. On the contrary, their physiological origins could lead them to be really perceived although not lived in the reality. Further work is needed to better understand this phenomenon.

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Section: Discussionmentioning

confidence: 99%

Characteristics of Near-Death Experiences Memories as Compared to Real and Imagined Events Memories

et al. 2013

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“…Elliott and Shorvon claim that complex hallucinatory experiences in epilepsy cannot be well localized, and the more elementary they are, the more localized they tend to be [ 6 ]. Noteworthy, simple autoscopic mirror images are likely to be lateralized [ 18 ].…”

Section: Discussionmentioning

confidence: 99%

Experiential seizures related to the hippocampal-parahippocampal spatial representation system

Revdal

Arntsen

Doan

et al. 2020

Epilepsy & Behavior Reports

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Ictal visual hallucinations may have occipital as well as temporal lobe origin. We report a patient with clustering of focal aware seizures with visual hallucinations. Ictal EEG findings and seizure semiology with alternating contralateral elementary visual phenomena and non-lateralizing experiential hallucinations (visual scenes, memory flashbacks, spatial distortion) corresponded to a lesion in the posterior part of the right parahippocampal gyrus. This area is part of the hippocampal-parahippocampal system for mapping allocentric space. Within this system, the parahippocampal cortex encodes information about visual environmental scenes in concert with functionally defined neurons relevant for episodic memory and spatial cognitive processes (place, grid, border and head direction cells, as well as neurons tracking the passage of time). These functions are tightly linked to visual exploration. We suggest that the hippocampal-parahippocampal spatial navigation system is a crucial part of the networks responsible for the semiology of experiential seizures with complex visual hallucinations and elements of recall.

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“…1,4 At cabin pressures of 575 mm Hg, gas expands to 132% of its volume when at sea level, leading to an elevation of intra-abdominal pressure, 6 which may cause underdrainage and raised intracranial pressure (ICP) in shunt-treated patients. 1,4 At cabin pressures of 575 mm Hg, gas expands to 132% of its volume when at sea level, leading to an elevation of intra-abdominal pressure, 6 which may cause underdrainage and raised intracranial pressure (ICP) in shunt-treated patients.…”

Section: Flying With a Shuntmentioning

confidence: 99%