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Iwata T, Yanagisawa T, Ikegaya Y, Smallwood J, Fukuma R, Oshino S, Tani N, Khoo HM, Kishima H. Hippocampal sharp-wave ripples correlate with periods of naturally occurring self-generated thoughts in humans. Nat Commun 2024; 15:4078. [PMID: 38778048 PMCID: PMC11111804 DOI: 10.1038/s41467-024-48367-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Accepted: 04/29/2024] [Indexed: 05/25/2024] Open
Abstract
Core features of human cognition highlight the importance of the capacity to focus on information distinct from events in the here and now, such as mind wandering. However, the brain mechanisms that underpin these self-generated states remain unclear. An emerging hypothesis is that self-generated states depend on the process of memory replay, which is linked to sharp-wave ripples (SWRs), which are transient high-frequency oscillations originating in the hippocampus. Local field potentials were recorded from the hippocampus of 10 patients with epilepsy for up to 15 days, and experience sampling was used to describe their association with ongoing thought patterns. The SWR rates were higher during extended periods of time when participants' ongoing thoughts were more vivid, less desirable, had more imaginable properties, and exhibited fewer correlations with an external task. These data suggest a role for SWR in the patterns of ongoing thoughts that humans experience in daily life.
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Affiliation(s)
- Takamitsu Iwata
- Department of Neurosurgery, Graduate School of Medicine, Osaka University, Osaka, 565-0871, Japan
| | - Takufumi Yanagisawa
- Department of Neurosurgery, Graduate School of Medicine, Osaka University, Osaka, 565-0871, Japan.
- Institute for Advanced Co-Creation Studies, Osaka University, Osaka, 565-0871, Japan.
| | - Yuji Ikegaya
- Laboratory of Chemical Pharmacology, Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, 113-0033, Japan
- Institute for AI and Beyond, The University of Tokyo, Tokyo, 113-0033, Japan
- National Institute of Information and Communications Technology, Center for Information and Neural Networks, Suita City, Osaka, 565-0871, Japan
| | - Jonathan Smallwood
- Department of Psychology, Queen's University, Kingston, ON, K7L 3N6, Canada
| | - Ryohei Fukuma
- Department of Neurosurgery, Graduate School of Medicine, Osaka University, Osaka, 565-0871, Japan
- Institute for Advanced Co-Creation Studies, Osaka University, Osaka, 565-0871, Japan
| | - Satoru Oshino
- Department of Neurosurgery, Graduate School of Medicine, Osaka University, Osaka, 565-0871, Japan
| | - Naoki Tani
- Department of Neurosurgery, Graduate School of Medicine, Osaka University, Osaka, 565-0871, Japan
| | - Hui Ming Khoo
- Department of Neurosurgery, Graduate School of Medicine, Osaka University, Osaka, 565-0871, Japan
| | - Haruhiko Kishima
- Department of Neurosurgery, Graduate School of Medicine, Osaka University, Osaka, 565-0871, Japan
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Tena-Cucala R, Sala-Padró J, Jaraba S, Hernández G, Fernández-Coello A, Rosselló A, Camins À, Naval-Baudin P, Fernández-Viñas M, Rodríguez-Bel L, Reynes G, Falip M. Eating-induced seizures: A semiological sign of the right temporal pole. Epileptic Disord 2023; 25:480-491. [PMID: 37309048 DOI: 10.1002/epd2.20035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 12/07/2022] [Accepted: 01/22/2023] [Indexed: 06/14/2023]
Abstract
OBJECTIVE Eating-induced seizures (EIS) are a rare form of reflex seizures. The objective of this study was to report a series of cases of EIS involving patients admitted to our epilepsy unit, and to analyze the clinical characteristics, etiology, and treatment response of this type of infrequent seizure. METHODS We performed a single-center retrospective analysis of all consecutive patients diagnosed with epilepsy with eating-induced seizures between 2008 and 2020. RESULTS We included eight patients (six women) with mean age 54.75 years (range: 40-79), and mean age at epilepsy onset 30.75 years (range: 9-58 years). EIS were triggered during a meal in 5/8 (at dinner 1/8, at breakfast in 1/8, and without time preference in 3/8), by a certain flavor in 1/8, by eating different textures or drinking soft drinks in 1/8, and by slicing food in 1/8. All patients suffered nonreflex seizures and 3/8 other types of reflex seizures. In 6/8 of patients, EIS originated in the right hemisphere. In 5/8, the EIS progressed to impaired awareness with oromandibular automatisms. In 6/8, the epilepsy was drug-resistant. Temporopolar encephalocele was the most frequent etiology, in 4/8. Three of the eight underwent surgical treatment, with Engel IA 1 year in 3/3. Three of the eight were treated with vagal stimulation therapy, with McHugh A 1 year in 2/3. SIGNIFICANCE In our series, eating-induced seizures were observed in patients with focal epilepsy. It was frequently drug-resistant and started predominantly in the right hemisphere, due to temporal pole involvement in half of the patients.
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Affiliation(s)
- Raquel Tena-Cucala
- Epilepsy Unit, Neurology Service, Neurological Diseases and Neurogenetics Group, Neuroscience Area, Bellvitge Institute for Biomedical Research (IDIBELL), Hospital Universitario de Bellvitge, L'Hospitalet de Llobregat, Spain
| | - Jacint Sala-Padró
- Epilepsy Unit, Neurology Service, Brain and Cognition Group, Neuroscience Area, Bellvitge Institute for Biomedical Research (IDIBELL), Hospital Universitario de Bellvitge, L'Hospitalet de Llobregat, Spain
| | - Sònia Jaraba
- Epilepsy Unit, Neurology Service, Neurological Diseases and Neurogenetics Group, Neuroscience Area, Bellvitge Institute for Biomedical Research (IDIBELL), Hospital Universitario de Bellvitge, L'Hospitalet de Llobregat, Spain
| | - Guillermo Hernández
- Epilepsy Unit, Neurology Service, Neurological Diseases and Neurogenetics Group, Neuroscience Area, Bellvitge Institute for Biomedical Research (IDIBELL), Hospital Universitario de Bellvitge, L'Hospitalet de Llobregat, Spain
| | - Alejandro Fernández-Coello
- Epilepsy Unit, Neurosurgery Service, Neuroscience Area, Bellvitge Institute for Biomedical Research (IDIBELL), Universitat de Barcelona, Hospital Universitario de Bellvitge, L'Hospitalet de Llobregat, Spain
| | - Aleix Rosselló
- Epilepsy Unit, Neurosurgery Service, Neuroscience Area, Bellvitge Institute for Biomedical Research (IDIBELL), Universitat de Barcelona, Hospital Universitario de Bellvitge, L'Hospitalet de Llobregat, Spain
| | - Àngels Camins
- IDI, Image Diagnostic Institute, Neuroradiology Division, Hospital Universitario de Bellvitge, L'Hospitalet de Llobregat, Spain
| | - Pablo Naval-Baudin
- IDI, Image Diagnostic Institute, Neuroradiology Division, Hospital Universitario de Bellvitge, L'Hospitalet de Llobregat, Spain
| | - Montserrat Fernández-Viñas
- IDI, Image Diagnostic Institute, Neuroradiology Division, Hospital Universitario de Bellvitge, L'Hospitalet de Llobregat, Spain
| | - Laura Rodríguez-Bel
- PET Unit, Department of Nuclear Medicine-IDI, IDIBELL, Hospital Universitario de Bellvitge, L'Hospitalet de Llobregat, Spain
| | - Gabriel Reynes
- PET Unit, Department of Nuclear Medicine-IDI, IDIBELL, Hospital Universitario de Bellvitge, L'Hospitalet de Llobregat, Spain
| | - Mercè Falip
- Epilepsy Unit, Neurology Service, Neurological Diseases and Neurogenetics Group, Neuroscience Area, Bellvitge Institute for Biomedical Research (IDIBELL), Hospital Universitario de Bellvitge, L'Hospitalet de Llobregat, Spain
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Shebani Z, Brown AJ, Narvaez Caicedo C, Rane S, Masel T. Seizures Provoked by Greasy Pork in a Patient With Refractory Focal Epilepsy. Cureus 2023; 15:e40155. [PMID: 37431336 PMCID: PMC10329567 DOI: 10.7759/cureus.40155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/08/2023] [Indexed: 07/12/2023] Open
Abstract
Seizures have been reported to be directly triggered by certain foods in some people with epilepsy. On the other hand, eating epilepsy has been mentioned in the literature as a rare disorder characterized by clinical and EEG findings that vary from patient to patient and are interestingly prevalent in certain geographic areas. Epilepsy in these patients is either idiopathic or due to underlying brain pathology. We present a case of refractory focal epilepsy in which the patient reports seizures provoked by eating greasy pork. During the admission to the epilepsy monitoring unit (EMU), the patient did not have seizures during the first three days of the admission despite antiepileptic medication withdrawal, sleep deprivation, and photic stimulation. However, when he consumed greasy pork, he had tonic-clonic convulsions about five hours after eating. On the following day, he had another tonic-clonic seizure after eating greasy pork.
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Affiliation(s)
- Zacharia Shebani
- Neurology, The University of Texas Medical Branch, Galveston, USA
| | | | | | - Schweta Rane
- Neurology, The University of Texas Medical Branch, Galveston, USA
| | - Todd Masel
- Neurology, The University of Texas Medical Branch, Galveston, USA
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Schulze-Bonhage A. Seizure prediction: Time for new, multimodal and ultra-long-term approaches. Clin Neurophysiol 2021; 133:152-153. [PMID: 34802924 DOI: 10.1016/j.clinph.2021.10.006] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Accepted: 10/28/2021] [Indexed: 11/25/2022]
Affiliation(s)
- Andreas Schulze-Bonhage
- Epilepsy Center, University Medical Center, Faculty of Medicine, University of Freiburg, Germany; European Reference Network EpiCare, Europe; Bernstein Center Freiburg, University of Freiburg, Germany; NeuroModule Basic, University Medical Center, Faculty of Medicine, University of Freiburg, Germany.
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