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Localization Related Epilepsies on EEG

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Electric source imaging for presurgical epilepsy evaluation: current status and future prospects.

Pierre Mégevand, Margitta Seeck,

Introduction: Electric source imaging (ESI) refers to the estimation of the cerebral sources of electric signals recorded at the head surface using electroencephalography (EEG). Thanks to the availability of EEG systems with high numbers of electrodes and to progress in software to analyze the signals they collect, ESI can be ... Read more >>

Expert Rev Med Devices (Expert review of medical devices)
[2020, :]

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The Potential of Stereotactic-EEG for Brain-Computer Interfaces: Current Progress and Future Directions.

Christian Herff, Dean J Krusienski, Pieter Kubben,

Stereotactic electroencephalogaphy (sEEG) utilizes localized, penetrating depth electrodes to measure electrophysiological brain activity. It is most commonly used in the identification of epileptogenic zones in cases of refractory epilepsy. The implanted electrodes generally provide a sparse sampling of a unique set of brain regions including deeper brain structures such as ... Read more >>

Front Neurosci (Frontiers in Neuroscience)
[2020, 14:123]

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Zeffiro User Interface for Electromagnetic Brain Imaging: a GPU Accelerated FEM Tool for Forward and Inverse Computations in Matlab.

Q He, A Rezaei, S Pursiainen,

This article introduces the Zeffiro interface (ZI) version 2.2 for brain imaging. ZI aims to provide a simple, accessible and multimodal open source platform for finite element method (FEM) based and graphics processing unit (GPU) accelerated forward and inverse computations in the Matlab environment. It allows one to (1) generate ... Read more >>

Neuroinformatics (Neuroinformatics)
[2020, 18(2):237-250]

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Advanced neuroimaging techniques for evaluating pediatric epilepsy.

Yun Jeong Lee,

Accurate localization of the seizure onset zone is important for better seizure outcomes and preventing deficits following epilepsy surgery. Recent advances in neuroimaging techniques have increased our understanding of the underlying etiology and improved our ability to noninvasively identify the seizure onset zone. Using epilepsy-specific magnetic resonance imaging (MRI) protocols, ... Read more >>

Clin Exp Pediatr (Clinical and experimental pediatrics)
[2020, 63(3):88-95]

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Quantitative spatio-temporal characterization of epileptic spikes using high density EEG: Differences between NREM sleep and REM sleep.

Xuan Kang, Melanie Boly, Graham Findlay, Benjamin Jones, Klevest Gjini, Rama Maganti, Aaron F Struck,

In this study, we applied high-density EEG recordings (HD-EEG) to quantitatively characterize the fine-grained spatiotemporal distribution of inter-ictal epileptiform discharges (IEDs) across different sleep stages. We quantified differences in spatial extent and duration of IEDs at the scalp and cortical levels using HD-EEG source-localization, during non-rapid eye movement (NREM) sleep ... Read more >>

Sci Rep (Scientific reports)
[2020, 10(1):1673]

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Effect of interictal epileptiform discharges on EEG-based functional connectivity networks.

Derek K Hu, Andrew Mower, Daniel W Shrey, Beth A Lopour,

OBJECTIVE:Functional connectivity networks (FCNs) based on interictal electroencephalography (EEG) can identify pathological brain networks associated with epilepsy. FCNs are altered by interictal epileptiform discharges (IEDs), but it is unknown whether this is due to the morphology of the IED or the underlying pathological activity. Therefore, we characterized the impact of ... Read more >>

Clin Neurophysiol (Clinical neurophysiology : official journal of the International Federation of Clinical Neurophysiology)
[2020, 131(5):1087-1098]

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ECoG Beta Suppression and Modulation During Finger Extension and Flexion.

Julian Unterweger, Martin Seeber, Stavros Zanos, Jeffrey G Ojemann, Reinhold Scherer,

Neural oscillations originate predominantly from interacting cortical neurons and consequently reflect aspects of cortical information processing. However, their functional role is not yet fully understood and their interpretation is debatable. Amplitude modulations (AMs) in alpha (8-12 Hz), beta (13-30 Hz), and high gamma (70-150 Hz) band in invasive electrocorticogram (ECoG) ... Read more >>

Front Neurosci (Frontiers in neuroscience)
[2020, 14:35]

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Comparison of pseudocontinuous arterial spin labeling perfusion MR images and time-of-flight MR angiography in the detection of periictal hyperperfusion.

Noritoshi Shirozu, Takato Morioka, So Tokunaga, Takafumi Shimogawa, Daisuke Inoue, Shoji Arihiro, Ayumi Sakata, Nobutaka Mukae, Sei Haga, Koji Iihara,

Background:Magnetic resonance imaging (MRI), including perfusion MRI with three-dimensional pseudocontinuous arterial spin labeling (ASL) and diffusion-weighted imaging (DWI), are applied in the periictal (including ictal and postictal) detection of circulatory and metabolic consequences associated with epilepsy. Our previous report revealed that periictal hyperperfusion can firstly be detected on ASL, and ... Read more >>

eNeurologicalSci (eNeurologicalSci)
[2020, 19:100233]

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Cortical Oscillations during Gait: Wouldn't Walking be so Automatic?

Arnaud Delval, Madli Bayot, Luc Defebvre, Kathy Dujardin,

Gait is often considered as an automatic movement but cortical control seems necessary to adapt gait pattern with environmental constraints. In order to study cortical activity during real locomotion, electroencephalography (EEG) appears to be particularly appropriate. It is now possible to record changes in cortical neural synchronization/desynchronization during gait. Studying ... Read more >>

Brain Sci (Brain sciences)
[2020, 10(2):]

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Subtraction Ictal SPECT coregistered to MRI (SISCOM) as a guide in localizing childhood epilepsy.

Thomas Foiadelli, Lieven Lagae, Karolien Goffin, Tom Theys, Mara De Amici, Lucia Sacchi, Johannes Van Loon, Salvatore Savasta, Katrien Jansen,

Objective:To assess feasibility and efficacy of subtraction ictal SPECT coregistered to MRI (SISCOM) for epilepsy localization in children who are candidates for resective surgery. Methods:We retrospectively reviewed all patients ≤16 years with drug-resistant epilepsy screened for epilepsy surgery in the University Hospital of Leuven from January 2009 to January 2018. Fifty-eight ... Read more >>

Epilepsia Open (Epilepsia open)
[2020, 5(1):61-72]

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Distributed source analysis of magnetoencephalography using a volume head model combined with statistical methods improves focus diagnosis in epilepsy surgery.

Tomotaka Ishizaki, Satoshi Maesawa, Daisuke Nakatsubo, Hiroyuki Yamamoto, Sou Takai, Masashi Shibata, Sachiko Kato, Jun Natsume, Minoru Hoshiyama, Toshihiko Wakabayashi,

Deep-seated epileptic focus estimation using magnetoencephalography is challenging because of its low signal-to-noise ratio and the ambiguity of current sources estimated by interictal epileptiform discharge (IED). We developed a distributed source (DS) analysis method using a volume head model as the source space of the forward model and standardized low-resolution ... Read more >>

Sci Rep (Scientific reports)
[2020, 10(1):5263]

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Interictal Epileptiform Discharges and the Quality of Human Intracranial Neurophysiology Data.

Simon G Ammanuel, Jonathan K Kleen, Matthew K Leonard, Edward F Chang,

Intracranial electroencephalography (IEEG) involves recording from electrodes placed directly onto the cortical surface or deep brain locations. It is performed on patients with medically refractory epilepsy, undergoing pre-surgical seizure localization. IEEG recordings, combined with advancements in computational capacity and analysis tools, have accelerated cognitive neuroscience. This Perspective describes a potential ... Read more >>

Front Hum Neurosci (Frontiers in Human Neuroscience)
[2020, 14:44]

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Localization with high-density EEG: Complexity of analysis versus accuracy.

Vinita J Acharya, Jayant N Acharya,

Clin Neurophysiol Pract (Clinical neurophysiology practice)
[2020, 5:10-11]

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Model-based design for seizure control by stimulation.

Arian Ashourvan, Sérgio Pequito, Ankit N Khambhati, Fadi Mikhail, Steven N Baldassano, Kathryn A Davis, Timothy H Lucas, Jean M Vettel, Brian Litt, George J Pappas, Danielle S Bassett,

OBJECTIVE:Current brain stimulation paradigms are largely empirical rather than theoretical. An opportunity exists to improve upon their modest effectiveness in closed-loop control strategies with the development of theoretically grounded, model-based designs. APPROACH:Inspired by this need, here we couple experimental data and mathematical modeling with a control-theoretic strategy for seizure termination. ... Read more >>

J Neural Eng (Journal of neural engineering)
[2020, 17(2):026009]

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Deep Brain Stimulation of Anterior Thalamic Nucleus for Treatment of Patient with Tuberous Sclerosis-Related Refractory Epilepsy.

He Zheng, Wang Chengcheng, Jiang Bin, Wang Chaochao, Zhang Hongying, Guo Wenqiang, Liu Bin, Tian Hailong, Wang Zhigang,

BACKGROUND:Neuromodulation is recommended for patients with refractory tuberous sclerosis related epilepsy (TRE) who are unable to localize epileptogenic nodules after comprehensive preoperative evaluation or for patients and families who do not agree to resection. CASE DESCRIPTION:We report a patient with refractory TRE who received deep brain stimulation of anterior thalamic ... Read more >>

World Neurosurg (World neurosurgery)
[2020, 138:141-144]

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Baseline Difference in Quantitative Electroencephalography Variables Between Responders and Non-Responders to Low-Frequency Repetitive Transcranial Magnetic Stimulation in Depression.

Premysl Vlcek, Martin Bares, Tomas Novak, Martin Brunovsky,

Repetitive transcranial magnetic stimulation (rTMS) is an effective treatment for depressive disorder, with outcomes approaching 45-55% response and 30-40% remission. Eligible predictors of treatment outcome, however, are still lacking. Few studies have investigated quantitative electroencephalography (QEEG) parameters as predictors of rTMS treatment outcome and none of them have addressed the ... Read more >>

Front Psychiatry (Frontiers in Psychiatry)
[2020, 11:83]

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Dataset of human medial temporal lobe neurons, scalp and intracranial EEG during a verbal working memory task.

Ece Boran, Tommaso Fedele, Adrian Steiner, Peter Hilfiker, Lennart Stieglitz, Thomas Grunwald, Johannes Sarnthein,

We present an electrophysiological dataset recorded from nine subjects during a verbal working memory task. Subjects were epilepsy patients undergoing intracranial monitoring for the localization of epileptic seizures. Subjects performed a modified Sternberg task in which the encoding of memory items, maintenance, and recall were temporally separated. The dataset includes ... Read more >>

Sci Data (Scientific data)
[2020, 7(1):30]

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An update on pediatric surgical epilepsy: Part II.

Nisha Gadgil, Matthew Muir, Melissa A Lopresti, Sandi K Lam,

Background:Recent advances may allow surgical options for pediatric patients with refractory epilepsy not previously deemed surgical candidates. This review outlines major technological developments in the field of pediatric surgical epilepsy. Methods:The literature was comprehensively reviewed and summarized pertaining to stereotactic electroencephalography (sEEG), laser ablation, focused ultrasound (FUS), responsive neurostimulation (RNS), ... Read more >>

Surg Neurol Int (Surgical Neurology International)
[2019, 10:258]

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Brain regions associated with periodic leg movements during sleep in restless legs syndrome.

Tae-Joon Kim, Kwang Su Cha, Sanghun Lee, Tae-Won Yang, Keun Tae Kim, Byeong-Su Park, Jin-Sun Jun, Jung-Ah Lim, Jung-Ick Byun, Jun-Sang Sunwoo, Jung-Won Shin, Kyung Hwan Kim, Sang Kun Lee, Ki-Young Jung,

The neural substrates related to periodic leg movements during sleep (PLMS) remain uncertain, and the specific brain regions involved in PLMS have not been evaluated. We investigated the brain regions associated with PLMS and their severity using the electroencephalographic (EEG) source localization method. Polysomnographic data, including electromyographic, electrocardiographic, and 19-channel ... Read more >>

Sci Rep (Scientific reports)
[2020, 10(1):1615]

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Electroencephalogram studies of hypoxic ischemia in fetal and neonatal animal models.

Hamid Abbasi, Charles P Unsworth,

Alongside clinical achievements, experiments conducted on animal models (including primate or non-primate) have been effective in the understanding of various pathophysiological aspects of perinatal hypoxic/ischemic encephalopathy (HIE). Due to the reasonably fair degree of flexibility with experiments, most of the research around HIE in the literature has been largely concerned ... Read more >>

Neural Regen Res (Neural regeneration research)
[2020, 15(5):828-837]

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Clinical features and electroclinical evolution in 22 cases with epileptic spasms without hypsarrhythmia.

Reiko Koichihara, Shin-Ichiro Hamano, Atsuro Daida, Hazuki Nonoyama, Satoru Ikemoto, Yuko Hirata, Ryuki Matsuura,

This study aimed to investigate the general presentation of epileptic spasms without hypsarrhythmia (ESwoH) and retrospectively determine whether there are differences in treatment effects related to ACTH therapy, long-term seizure outcome, and evolution of EEG features according to pre-treatment EEG patterns. According to the pattern of background activity, we divided ... Read more >>

Epileptic Disord (Epileptic disorders : international epilepsy journal with videotape)
[2020, 22(1):73-82]

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Acute Effects and the Dreamy State Evoked by Deep Brain Electrical Stimulation of the Amygdala: Associations of the Amygdala in Human Dreaming, Consciousness, Emotions, and Creativity.

George Lai, Jean-Philippe Langevin, Ralph J Koek, Scott E Krahl, Ausaf A Bari, James W Y Chen,

Accurate localization of complex human experiences such as emotions, dreaming, creativity, and consciousness to specific cerebral structures or neural networks has remained elusive despite technological advances. We report the use of acute deep brain stimulation (DBS) to evoke behavioral and emotional effects by applying electrical stimulation (ES) at various voltage ... Read more >>

Front Hum Neurosci (Frontiers in human neuroscience)
[2020, 14:61]

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Lack of a Sense of Threat and Higher Emotional Lability in Patients With Chronic Microvascular Ischemia as Measured by Non-linear EEG Parameters.

Galina V. Portnova,

We aimed to investigate the non-linear features of the electroencephalogram (EEG) findings in patients with chronic microvascular ischemia (CMI) in order to determine the brain correlates of emotional impairment that could impact the risk of developing acute ischemia. We compared the EEG responses of patients with CMI and age-matched healthy ... Read more >>

Front Neurol (Frontiers in Neurology)
[2020, 11:]

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Efficacy of Levetiracetam in Treatment of Childhood Stuttering.

Mohammadreza Ghazavi, Fateme Rastgu, Jafar Nasiri, Omid Yaghini,

Background:Stuttering is a kind of speech disorder that affects about 1% of total population. As the origin of this disorder is not obviously diagnosed yet, various remedies have been practiced and among them different medicines have been studied, but unfortunately no significant effective drugs have been recognized yet. As stuttering ... Read more >>

Int J Prev Med (International journal of preventive medicine)
[2020, 11:17]

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Patents and Innovation Among Neurosurgeons from the American Association of Neurological Surgeons.

Rebecca B Baron, Remi A Kessler, Ansh Bhammar, Nicholas Boulis, John R Adler, Karan Kohli, Constantinos Hadjipanayis,

Objective Neurosurgeons have taken on the role of innovators, continuing to move the field forward over the centuries. More recently, innovation has taken the form of new technological devices and therapeutics, which require patenting. The aim of this study is to identify major areas of innovation in the field of ... Read more >>

Cureus (Cureus)
[2020, 12(2):e7031]

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