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Electrocorticography

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https://www.readbyqxmd.com/read/28644979/intraoperative-fast-ripples-independently-predict-postsurgical-epilepsy-outcome-comparison-with-other-electrocorticographic-phenomena
#1
Shaun A Hussain, Gary W Mathern, Phoebe Hung, Julius Weng, Raman Sankar, Joyce Y Wu
In the surgical management of epilepsy, the resection of cortex exhibiting interictal fast ripples (250-500Hz) on electrocorticography has been linked to postoperative seizure-freedom. Although fast ripples appear to accurately identify the epileptogenic zone-the minimum tissue that must be removed at surgery to achieve seizure-freedom-it has not been established that fast ripples are a superior biomarker in comparison with multimodal presurgical neuroimaging and other electrocorticography abnormalities. Hence, in the prediction of postoperative seizure-freedom, we compared the value of fast ripples with other intraoperative electocorticography abnormalities including focal slowing, paroxysmal fast activity, intermittent spike discharges, continuous epileptiform discharges, focal attenuation, and intraoperative seizures, as well as complete resection of the lesion defined by MRI and other neuroimaging...
June 16, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28618390/thirty-day-non-seizure-outcomes-following-temporal-lobectomy-for-adult-epilepsy
#2
Brandon A Sherrod, Matthew C Davis, Kristen O Riley
OBJECTIVE: Multi-institutional rates of acute adverse outcomes other than seizures after temporal lobectomy (TL) are not well understood. Here we analyzed short-term morbidity and mortality following TL using a validated national database. PATIENTS AND METHODS: The multi-institutional American College of Surgeons National Surgical Quality Improvement Program (NSQIP) database was queried by Current Procedural Terminology (CPT) code for TL procedures performed for adult patients with diagnoses related to epilepsy from 2008 to 2014...
June 8, 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/28617218/multi-scale-visual-analysis-of-time-varying-electrocorticography-data-via-clustering-of-brain-regions
#3
Sugeerth Murugesan, Kristofer Bouchard, Edward Chang, Max Dougherty, Bernd Hamann, Gunther H Weber
BACKGROUND: There exists a need for effective and easy-to-use software tools supporting the analysis of complex Electrocorticography (ECoG) data. Understanding how epileptic seizures develop or identifying diagnostic indicators for neurological diseases require the in-depth analysis of neural activity data from ECoG. Such data is multi-scale and is of high spatio-temporal resolution. Comprehensive analysis of this data should be supported by interactive visual analysis methods that allow a scientist to understand functional patterns at varying levels of granularity and comprehend its time-varying behavior...
June 6, 2017: BMC Bioinformatics
https://www.readbyqxmd.com/read/28615329/physiological-properties-of-brain-machine-interface-input-signals
#4
Marc W Slutzky, Robert D Flint
Brain machine interfaces (BMIs), also called brain computer interfaces (BCIs), decode neural signals and use them to control some type of external device. Despite many experimental successes and terrific demonstrations in animals and humans, a high-performance, clinically-viable device has not yet been developed for widespread usage. There are many factors that impact clinical viability and BMI performance. Arguably the first of these is the selection of brain signals used to control BMIs. Here, we summarize the physiological characteristics and performance-including movement-related information, longevity, and stability-of multiple types of input signals that have been used in invasive BMIs to date...
June 14, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28597847/mapping-the-fine-structure-of-cortical-activity-with-different-micro-ecog-electrode-array-geometries
#5
Xi Wang, Alexis Gkogkidis, Olga Iljina, Lukas Fiederer, Chiristian Henle, Irina Mader, Jan Kaminsky, Thomas Stieglitz, Mortimer Gierthmuehlen, Tonio Ball
OBJECTIVE: Innovations in micro-electrocorticography (µECoG) electrode array manufacturing now allow for intricate designs with smaller contact diameters and/or pitch (i.e., center-to-center contact distance) down to the sub-mm range. The aims of the present study were: (i) to investigate whether frequency ranges up to 400 Hz can be reproducibly observed in µECoG recordings and (ii) to examine how differences in topographical substructure between these frequency bands and electrode array geometries can be quantified...
June 9, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28584127/dynamic-changes-in-murine-forebrain-mir-211-expression-associate-with-cholinergic-imbalances-and-epileptiform-activity
#6
Uriya Bekenstein, Nibha Mishra, Dan Z Milikovsky, Geula Hanin, Daniel Zelig, Liron Sheintuch, Amit Berson, David S Greenberg, Alon Friedman, Hermona Soreq
Epilepsy is a common neurological disease, manifested in unprovoked recurrent seizures. Epileptogenesis may develop due to genetic or pharmacological origins or following injury, but it remains unclear how the unaffected brain escapes this susceptibility to seizures. Here, we report that dynamic changes in forebrain microRNA (miR)-211 in the mouse brain shift the threshold for spontaneous and pharmacologically induced seizures alongside changes in the cholinergic pathway genes, implicating this miR in the avoidance of seizures...
June 20, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28577913/anticonvulsant-activity-of-resveratrol-loaded-liposomes-in-vivo
#7
M S Ethemoglu, F B Seker, H Akkaya, E Kilic, I Aslan, C S Erdogan, B Yilmaz
Resveratrol (3,5,4'-stilbenetriol), a natural polyphenol produced by various plants, has attracted attention over the past decade because of its multiple beneficial properties, including anti-inflammatory, anti-oxidant and chemopreventive, yet, there is limited information about its antiepileptic effects. Moreover, its poor solubility in water and low bioavailability are the challenging issues. In the present study, we aimed to investigate effects of free resveratrol and resveratrol delivered in amphipathic liposomal delivery system, which has a high blood-brain barrier crossing potential, on penicillin-induced epileptic seizure model...
June 1, 2017: Neuroscience
https://www.readbyqxmd.com/read/28573982/a-silicon-carbide-electrode-technology-for-the-central-and-the-peripheral-nervous-system
#8
Camilo Diaz-Botia, Lunet Luna, Ryan Neely, Maysam Chamanzar, Carlo Cararro, Jose Carmena, Philip Sabes, Roya Maboudian, Michel Maharbiz
Current neural probes have limited device lifetime a few years. Their common failure mode is the degradation of insulating films and/or the delamination of the conductor-insulator interfaces. We sought to develop a technology that does not suffer from such limitations and would be suitable for chronic applications with very long device lifetime. Approach: We developed a fabrication method that integrates polycrystalline conductive silicon carbide with insulating silicon carbide. The technology employs amorphous silicon carbide as insulator and conductive silicon carbide at the recording sites, resulting in a seamless transition between doped and amorphous regions of the same material, eliminating heterogeneous interfaces prone to delamination...
June 2, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28565831/clinical-characteristics-and-epilepsy-outcomes-following-surgery-caused-by-focal-cortical-dysplasia-type-iia-in-110-adult-epileptic-patients
#9
Yuqiang Sun, Xiaofeng Wang, Ningwei Che, Huamin Qin, Shuping Liu, Xinling Wu, Minghai Wei, Huakun Cheng, Jian Yin
The aim of the present study was to investigate the effects of surgical intervention of focal cortical dysplasia (FCD) IIa on the outcome of epilepsy, and to evaluate the prognostic factors of seizure freedom. Patient data from epilepsy surgeries were retrospectively reviewed at the Second Affiliated Hospital of Dalian Medical University between 2007 and 2015. A total of 110 patients with a definite pathological diagnosis of FCD IIa were included. Moreover, the clinical characteristics, seizure outcome and quality of life in adults with FCD IIa were evaluated...
May 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28553217/electrocorticography-of-spatial-shifting-and-attentional-selection-in-human-superior-parietal-cortex
#10
Maarten Schrooten, Eshwar G Ghumare, Laura Seynaeve, Tom Theys, Patrick Dupont, Wim Van Paesschen, Rik Vandenberghe
Spatial-attentional reorienting and selection between competing stimuli are two distinct attentional processes of clinical and fundamental relevance. In the past, reorienting has been mainly associated with inferior parietal cortex. In a patient with a subdural grid covering the upper and lower bank of the left anterior and middle intraparietal sulcus (IPS) and the superior parietal lobule (SPL), we examined the involvement of superior parietal cortex using a hybrid spatial cueing paradigm identical to that previously applied in stroke and in healthy controls...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28533406/spatiotemporal-dynamics-of-word-retrieval-in-speech-production-revealed-by-cortical-high-frequency-band-activity
#11
Stephanie K Riès, Rummit K Dhillon, Alex Clarke, David King-Stephens, Kenneth D Laxer, Peter B Weber, Rachel A Kuperman, Kurtis I Auguste, Peter Brunner, Gerwin Schalk, Jack J Lin, Josef Parvizi, Nathan E Crone, Nina F Dronkers, Robert T Knight
Word retrieval is core to language production and relies on complementary processes: the rapid activation of lexical and conceptual representations and word selection, which chooses the correct word among semantically related competitors. Lexical and conceptual activation is measured by semantic priming. In contrast, word selection is indexed by semantic interference and is hampered in semantically homogeneous (HOM) contexts. We examined the spatiotemporal dynamics of these complementary processes in a picture naming task with blocks of semantically heterogeneous (HET) or HOM stimuli...
June 6, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28524796/improvement-of-visual-field-defects-after-focal-resection-for-occipital-lobe-epilepsy-case-report
#12
Takahiro Yamamoto, Tadashi Hamasaki, Hideo Nakamura, Kazumichi Yamada
Improvement of visual field defects after surgical treatment for occipital lobe epilepsy is rare. Here, the authors report on a 24-year-old man with a 15-year history of refractory epilepsy that developed after he had undergone an occipital craniotomy to remove a cerebellar astrocytoma at the age of 4. His seizures started with an elementary visual aura, followed by secondary generalized tonic-clonic convulsion. Perimetry revealed left-sided incomplete hemianopia, and MRI showed an old contusion in the right occipital lobe...
May 19, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28512401/increased-gamma-connectivity-in-the-human-prefrontal-cortex-during-the-bereitschaftspotential
#13
Kisun Kim, June Sic Kim, Chun Kee Chung
The Bereitschaftspotential (BP) is a slow negative cortical potential preceding voluntary movement. Since movement preparation is dependent upon the synchronous activity of a variety of neurons, BP may develop through the exchange of information among motor-related neurons. However, the relationship between BP and information flow is not yet well-known. In the present study, we aimed to investigate how the connectivity in the prefrontal cortex (PFC) changes during the occurrence of BP. Electrocorticography (ECoG) was recorded in five patients with epilepsy...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28505599/a-new-method-for-quantifying-the-performance-of-eeg-blind-source-separation-algorithms-by-referencing-a-simultaneously-recorded-ecog-signal
#14
Naoya Oosugi, Keiichi Kitajo, Naomi Hasegawa, Yasuo Nagasaka, Kazuo Okanoya, Naotaka Fujii
Blind source separation (BSS) algorithms extract neural signals from electroencephalography (EEG) data. However, it is difficult to quantify source separation performance because there is no criterion to dissociate neural signals and noise in EEG signals. This study develops a method for evaluating BSS performance. The idea is neural signals in EEG can be estimated by comparison with simultaneously measured electrocorticography (ECoG). Because the ECoG electrodes cover the majority of the lateral cortical surface and should capture most of the original neural sources in the EEG signals...
January 29, 2017: Neural Networks: the Official Journal of the International Neural Network Society
https://www.readbyqxmd.com/read/28493386/a-ferroelectric-ceramic-polymer-composite-based-capacitive-electrode-array-for-in-vivo-recordings
#15
Changyong Chen, Miaomiao Xue, Yige Wen, Guang Yao, Yan Cui, Feiyi Liao, Zhuocheng Yan, Long Huang, Saeed Ahmed Khan, Min Gao, Taisong Pan, Hulin Zhang, Wei Jing, Daqing Guo, Sanfeng Zhang, Hailiang Yao, Xiong Zhou, Qiang Li, Yang Xia, Yuan Lin
A new implantable capacitive electrode array for electrocorticography signal recording is developed with ferroelectric ceramic/polymer composite. This ultrathin and electrically safe capacitive electrode array is capable of attaching to the biological tissue conformably. The barium titanate/polyimide (BaTiO3 /PI) nanocomposite with high dielectric constant is successfully synthesized and employed as the ultrathin dielectric layer of the capacitive BaTiO3 /PI electrode array. The performance of the capacitive BaTiO3 /PI electrode array is evaluated by electrical characterization and 3D finite-element modeling...
May 11, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28489913/human-perception-of-electrical-stimulation-on-the-surface-of-somatosensory-cortex
#16
Shivayogi V Hiremath, Elizabeth C Tyler-Kabara, Jesse J Wheeler, Daniel W Moran, Robert A Gaunt, Jennifer L Collinger, Stephen T Foldes, Douglas J Weber, Weidong Chen, Michael L Boninger, Wei Wang
Recent advancement in electrocorticography (ECoG)-based brain-computer interface technology has sparked a new interest in providing somatosensory feedback using ECoG electrodes, i.e., cortical surface electrodes. We conducted a 28-day study of cortical surface stimulation in an individual with arm paralysis due to brachial plexus injury to examine the sensation produced by electrical stimulation of the somatosensory cortex. A high-density ECoG grid was implanted over the somatosensory and motor cortices. Stimulation through cortical surface electrodes over the somatosensory cortex successfully elicited arm and hand sensations in our participant with chronic paralysis...
2017: PloS One
https://www.readbyqxmd.com/read/28483395/seizure-outcomes-in-children-following-electrocorticography-guided-single-stage-surgical-resection
#17
Seema Bansal, Andrew J Kim, Anne T Berg, Sookyong Koh, Linda C Laux, Srishti Nangia, John J Millichap, Alexandra Shaw, Breanne Fisher, Catherine Dezort, Arthur J DiPatri, Tord D Alden, Douglas R Nordli
BACKGROUND: In children with abnormal imaging, single-stage epilepsy surgery is an attractive alternative to the two-stage approach that relies on invasive recording of seizures. Implanted electrodes carry risks of their own and extend hospitalization, but the efficacy of one-stage resections in a variety of pathologies and cerebral locations is not well established. We report our center's experience with single-stage epilepsy surgery guided by intraoperative electrocorticography (ECoG)...
February 7, 2017: Pediatric Neurology
https://www.readbyqxmd.com/read/28452616/an-ovine-model-of-cerebral-catheter-venography-for-implantation-of-an-endovascular-neural-interface
#18
Thomas James Oxley, Nicholas Lachlan Opie, Gil Simon Rind, Kishan Liyanage, Sam Emmanuel John, Stephen Ronayne, Alan James McDonald, Anthony Dornom, Timothy John Haynes Lovell, Peter John Mitchell, Iwan Bennett, Sebastien Bauquier, Leon Norris Warne, Chris Steward, David Bruce Grayden, Patricia Desmond, Stephen M Davis, Terence John O'Brien, Clive N May
OBJECTIVE Neural interface technology may enable the development of novel therapies to treat neurological conditions, including motor prostheses for spinal cord injury. Intracranial neural interfaces currently require a craniotomy to achieve implantation and may result in chronic tissue inflammation. Novel approaches are required that achieve less invasive implantation methods while maintaining high spatial resolution. An endovascular stent electrode array avoids direct brain trauma and is able to record electrocorticography in local cortical tissue from within the venous vasculature...
April 28, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28444141/imaging-blood-brain-barrier-dysfunction-as-a-biomarker-for-epileptogenesis
#19
Guy Bar-Klein, Svetlana Lublinsky, Lyn Kamintsky, Iris Noyman, Ronel Veksler, Hotjensa Dalipaj, Vladimir V Senatorov, Evyatar Swissa, Dror Rosenbach, Netta Elazary, Dan Z Milikovsky, Nadav Milk, Michael Kassirer, Yossi Rosman, Yonatan Serlin, Arik Eisenkraft, Yoash Chassidim, Yisrael Parmet, Daniela Kaufer, Alon Friedman
A biomarker that will enable the identification of patients at high-risk for developing post-injury epilepsy is critically required. Microvascular pathology and related blood-brain barrier dysfunction and neuroinflammation were shown to be associated with epileptogenesis after injury. Here we used prospective, longitudinal magnetic resonance imaging to quantitatively follow blood-brain barrier pathology in rats following status epilepticus, late electrocorticography to identify epileptic animals and post-mortem immunohistochemistry to confirm blood-brain barrier dysfunction and neuroinflammation...
June 1, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28441637/subtle-pathological-changes-in-neocortical-temporal-lobe-epilepsy
#20
Juan G Ochoa, Diana Hentgarden, Audrey Paulzak, Melissa Ogden, Richard Pryson, Markus Lamle, Walter G Rusyniak
This was a prospective observational study to correlate the clinical symptoms, electrophysiology, imaging, and surgical pathology of patients with temporal lobe epilepsy (TLE) without hippocampal sclerosis. We selected consecutive patients with TLE and normal MRI undergoing temporal lobe resection between April and September 2015. Clinical features, imaging, and functional data were reviewed. Intracranial monitoring and language mapping were performed when it was required according to our team recommendation...
June 2017: Epilepsy & Behavior: E&B
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