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Electrocorticography

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https://www.readbyqxmd.com/read/29204348/non-ictal-onset-zone-a-window-to-ictal-dynamics
#1
Pegah Afra, Sara J Hanrahan, Spencer Sterling Kellis, Paul House
The focal and network concepts of epilepsy present different aspects of electroclinical phenomenon of seizures. Here, we present a 23-year-old man undergoing surgical evaluation with left fronto-temporal electrocorticography (ECoG) and microelectrode-array (MEA) in the middle temporal gyrus (MTG). We compare action-potential (AP) and local field potentials (LFP) recorded from MEA with ECoG. Seizure onset in the mesial-temporal lobe was characterized by changes in the pattern of AP-firing without clear changes in LFP or ECoG in MTG...
2017: Epilepsy & Behavior Case Reports
https://www.readbyqxmd.com/read/29201621/thermal-release-transfer-printing-for-stretchable-conformal-bioelectronics
#2
Zhuocheng Yan, Taisong Pan, Miaomiao Xue, Changyong Chen, Yan Cui, Guang Yao, Long Huang, Feiyi Liao, Wei Jing, Hulin Zhang, Min Gao, Daqing Guo, Yang Xia, Yuan Lin
Soft neural electrode arrays that are mechanically matched between neural tissues and electrodes offer valuable opportunities for the development of disease diagnose and brain computer interface systems. Here, a thermal release transfer printing method for fabrication of stretchable bioelectronics, such as soft neural electrode arrays, is presented. Due to the large, switchable and irreversible change in adhesion strength of thermal release tape, a low-cost, easy-to-operate, and temperature-controlled transfer printing process can be achieved...
November 2017: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
https://www.readbyqxmd.com/read/29201120/long-term-video-eeg-monitoring-findings-in-children-and-adolescents-with-intractable-epilepsy
#3
Yasaman Ghazavi, Ebrahim Asayesh Zarchi, Taher Taheri, Mahdi Safiabadi, Elham Rahimian, Susan Amirsalari
Objective: Long Term Video-EEG Monitoring (LTM) may give us important information in the preoperative assessment of these patients. We performed this study for the first time in pediatric age group in Iran. Materials and Methods: In this cross-sectional study, 43 children between 4 to 18 yr, with intractable epilepsy referred to Shefa Neuroscience Research Center, Tehran, Iranfrom2007-2012, were enrolled to study in order to evaluate their long-term video EEG findings...
2017: Iranian Journal of Child Neurology
https://www.readbyqxmd.com/read/29192865/electrocorticography-and-the-early-maturation-of-high-frequency-suppression-within-the-default-mode-network
#4
Kurt E Weaver, Andrew Poliakov, Edward J Novotny, Jared D Olson, Thomas J Grabowski, Jeffrey G Ojemann
OBJECTIVE The acquisition and refinement of cognitive and behavioral skills during development is associated with the maturation of various brain oscillatory activities. Most developmental investigations have identified distinct patterns of low-frequency electrophysiological activity that are characteristic of various behavioral milestones. In this investigation, the authors focused on the cross-sectional developmental properties of high-frequency spectral power from the brain's default mode network (DMN) during goal-directed behavior...
December 1, 2017: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/29191526/clinical-application-of-an-open-source-3d-volume-rendering-software-to-neurosurgical-approaches
#5
Bruno Fernandes de Oliveira Santos, Marcos Devanir Silva da Costa, Ricardo Silva Centeno, Sergio Cavalheiro, Manoel Antônio de Paiva Neto, Michael T Lawton, Feres Chaddad-Neto
OBJECTIVE: Preoperative recognition of the anatomic individualities of each patient can help in achieving more precise and less invasive approaches. Moreover, this may help with anticipating potential complications and intraoperative difficulties. To describe the use, accuracy, and precision of a free tool for planning microsurgical approaches using three-dimensional reconstructions from magnetic resonance images. METHODS: We used the 3D Volume Rendering tool of an open source and free software program for three-dimensional reconstruction of images of surgical sites obtained by MRI volumetric acquisitions...
November 27, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29190524/four-dimensional-map-of-the-human-early-visual-system
#6
Yasuo Nakai, Akari Nagashima, Akane Hayakawa, Takuya Osuki, Jeong-Won Jeong, Ayaka Sugiura, Erik C Brown, Eishi Asano
OBJECTIVE: We generated a large-scale, four-dimensional map of neuronal modulations elicited by full-field flash stimulation. METHODS: We analyzed electrocorticography (ECoG) recordings from 63 patients with focal epilepsy, and delineated the spatial-temporal dynamics of visually-elicited high-gamma70-110 Hz amplitudes on a standard brain template. We then clarified the neuronal events underlying visual evoked potential (VEP) components, by correlating with high-gamma amplitude measures...
November 27, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29190521/presurgical-language-mapping-using-event-related-high-gamma-activity-the-detroit-procedure
#7
REVIEW
Toshimune Kambara, Sandeep Sood, Zahraa Alqatan, Christine Klingert, Diksha Ratnam, Akane Hayakawa, Yasuo Nakai, Aimee F Luat, Rajkumar Agarwal, Robert Rothermel, Eishi Asano
A number of investigators have reported that event-related augmentation of high-gamma activity at 70-110 Hz on electrocorticography (ECoG) can localize functionally-important brain regions in children and adults who undergo epilepsy surgery. The advantages of ECoG-based language mapping over the gold-standard stimulation include: (i) lack of stimulation-induced seizures, (ii) better sensitivity of localization of language areas in young children, and (iii) shorter patient participant time. Despite its potential utility, ECoG-based language mapping is far less commonly practiced than stimulation mapping...
October 31, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29182152/decoding-of-finger-trajectory-from-ecog-using-deep-learning
#8
Ziqian Xie, Odelia Schwartz, Abhishek Prasad
Conventional decoding pipeline for brain machine interfaces (BMIs) consists of chained different stages of feature extraction, time-frequency analysis and statistical learning models. Each of these stages uses a different algorithm trained in a sequential manner, which makes it difficult to make the whole system adaptive. The goal was to create an adaptive online system with a single objective function and a single learning algorithm so that the whole system can be trained in parallel to increase the decoding performance...
November 28, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29176638/recursive-exponentially-weighted-n-way-partial-least-squares-regression-with-recursive-validation-of-hyper-parameters-in-brain-computer-interface-applications
#9
Andrey Eliseyev, Vincent Auboiroux, Thomas Costecalde, Lilia Langar, Guillaume Charvet, Corinne Mestais, Tetiana Aksenova, Alim-Louis Benabid
A tensor-input/tensor-output Recursive Exponentially Weighted N-Way Partial Least Squares (REW-NPLS) regression algorithm is proposed for high dimension multi-way (tensor) data treatment and adaptive modeling of complex processes in real-time. The method unites fast and efficient calculation schemes of the Recursive Exponentially Weighted PLS with the robustness of tensor-based approaches. Moreover, contrary to other multi-way recursive algorithms, no loss of information occurs in the REW-NPLS. In addition, the Recursive-Validation method for recursive estimation of the hyper-parameters is proposed instead of conventional cross-validation procedure...
November 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29176325/cav2-3-r-type-calcium-channels-are-critical-for-mediating-anticonvulsive-and-neuroprotective-properties-of-lamotrigine-in-vivo
#10
Maxine Dibué-Adjei, Marcel A Kamp, Serdar Alpdogan, Etienne E Tevoufouet, Wolfram F Neiss, Jürgen Hescheler, Toni Schneider
BACKGROUND/AIMS: Lamotrigine (LTG) is a popular modern antiepileptic drug (AED), however, its mechanism of action has yet to be fully understood, as it is known to modulate many members of several ion channel families. In heterologous systems, LTG inhibits Cav2.3 (R-type) calcium currents, which contribute to kainic-acid- (KA) induced epilepsy in vivo. To gain insight into the role of R-type currents in LTG drug action in vivo, we compared the effects of LTG to topiramate and lacosamide in Cav2...
November 24, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29175574/surgical-management-and-long-term-seizure-outcome-after-surgery-for-temporal-lobe-epilepsy-associated-with-cerebral-cavernous-malformations
#11
Peng-Fan Yang, Jia-Sheng Pei, Yan-Zeng Jia, Qiao Lin, Hui Xiao, Ting-Ting Zhang, Zhong-Hui Zhong
OBJECTIVE: Operative strategies for cerebral cavernous malformation (CCM)-associated temporal lobe epilepsy and timing of surgical intervention have continued under debate. This study aimed to establish an algorithm to evaluate efficacy of surgical intervention strategies, which maximizes positive surgical outcomes and minimizes post-surgical neurological deficits. METHODS: 47 subjects having undergone operation for CCM-associated temporal lobe epilepsy were retrospectively reviewed...
November 22, 2017: World Neurosurgery
https://www.readbyqxmd.com/read/29165746/computed-tomographic-localization-of-the-central-sulcus-a-morphometric-study-in-adult-patients
#12
Dan Zimelewicz Oberman, Jorge Rasmussen, Maximiliano Toscano, Ezequiel Goldschmidt, Pablo Ajler
AIM: Despite advances in intraoperative navigation and electrocorticography, neuroanatomical knowledge is an essential tool for neurosurgical planning. The aim of this study was to accurately describe the relations between the anatomical landmarks of the cranial convexity and the main cortical structures. MATERIAL AND METHODS: A retrospective cross-sectional, observational study was performed. Computed tomography scans of 71 adult patients with no pathological imaging were analyzed...
November 1, 2017: Turkish Neurosurgery
https://www.readbyqxmd.com/read/29163118/semi-automated-anatomical-labeling-and-inter-subject-warping-of-high-density-intracranial-recording-electrodes-in-electrocorticography
#13
Liberty S Hamilton, David L Chang, Morgan B Lee, Edward F Chang
In this article, we introduce img_pipe, our open source python package for preprocessing of imaging data for use in intracranial electrocorticography (ECoG) and intracranial stereo-EEG analyses. The process of electrode localization, labeling, and warping for use in ECoG currently varies widely across laboratories, and it is usually performed with custom, lab-specific code. This python package aims to provide a standardized interface for these procedures, as well as code to plot and display results on 3D cortical surface meshes...
2017: Frontiers in Neuroinformatics
https://www.readbyqxmd.com/read/29162522/loss-of-consciousness-is-related-to-hyper-correlated-gamma-band-activity-in-anesthetized-macaques-and-sleeping-humans
#14
Michał Bola, Adam B Barrett, Andrea Pigorini, Lino Nobili, Anil K Seth, Artur Marchewka
Loss of consciousness can result from a wide range of causes, including natural sleep and pharmacologically induced anesthesia. Important insights might thus come from identifying neuronal mechanisms of loss and re-emergence of consciousness independent of a specific manipulation. Therefore, to seek neuronal signatures of loss of consciousness common to sleep and anesthesia we analyzed spontaneous electrophysiological activity recorded in two experiments. First, electrocorticography (ECoG) acquired from 4 macaque monkeys anesthetized with different anesthetic agents (ketamine, medetomidine, propofol) and, second, stereo-electroencephalography (sEEG) from 10 epilepsy patients in different wake-sleep stages (wakefulness, NREM, REM)...
November 21, 2017: NeuroImage
https://www.readbyqxmd.com/read/29160240/remapping-cortical-modulation-for-electrocorticographic-brain-computer-interfaces-a-somatotopy-based-approach-in-individuals-with-upper-limb-paralysis
#15
Alan D Degenhart, Shivayogi V Hiremath, Ying Yang, Stephen T Foldes, Jennifer L Collinger, Michael L Boninger, Elizabeth C Tyler-Kabara, Wei Wang
OBJECTIVE: Brain-computer interface (BCI) technology aims to provide individuals with paralysis a means to restore function. Electrocorticography (ECoG) uses disc electrodes placed on either the surface of the dura or the cortex to record field potential activity. ECoG has been proposed as a viable neural recording modality for BCI systems, potentially providing stable, long-term recordings of cortical activity with high spatial and temporal resolution. Previously we have demonstrated that a subject with spinal cord injury (SCI) could control an ECoG-based BCI system with up to three degrees of freedom [Wang et al...
November 21, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29143307/considerations-in-performing-and-analyzing-the-responses-of-cortico-cortical-evoked-potentials-in-stereo-eeg
#16
REVIEW
David Prime, David Rowlands, Steven O'Keefe, Sasha Dionisio
This review aims to highlight key considerations when performing cortico-cortical evoked potentials (CCEPs) using stereo-electroencephalography (SEEG) for network mapping and show its clinical applicability to presurgical evaluations. The parameters for performing stimulation and safety aspects have been investigated in electrocorticography (ECoG) and deep brain stimulation (DBS), but not as extensively in SEEG. A review of current literature was performed, with an attempt made to emphasize practical insights from all modalities of intracranial stimulation...
November 16, 2017: Epilepsia
https://www.readbyqxmd.com/read/29137921/intraoperative-definition-of-bottom-of-sulcus-dysplasia-using-intraoperative-ultrasound-and-single-depth-electrode-recording-a-technical-note
#17
Dorothea Miller, Patrick Carney, John S Archer, Gregory J Fitt, Graeme D Jackson, Kristian J Bulluss
Bottom of sulcus dysplasias (BOSDs) are localized focal cortical dysplasias (FCDs) centred on the bottom of a sulcus that can be highly epileptogenic, but difficult to delineate intraoperatively. We report on a patient with refractory epilepsy due to a BOSD, successfully resected with the aid of a multimodal surgical approach using neuronavigation based on MRI and PET, intraoperative ultrasound (iUS) and electrocorticography (ECoG) using depth electrodes. The lesion could be visualized on iUS showing an increase in echogenicity at the grey-white matter junction...
November 11, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/29133909/tactile-frequency-specific-high-gamma-activities-in-human-primary-and-secondary-somatosensory-cortices
#18
Seokyun Ryun, June Sic Kim, Hyeongrae Lee, Chun Kee Chung
Humans can easily detect vibrotactile stimuli up to several hundred hertz, but underlying large-scale neuronal processing mechanisms in the cortex are largely unknown. Here, we investigated the macroscopic neural correlates of various vibrotactile stimuli including artificial and naturalistic ones in human primary and secondary somatosensory cortices (S1 and S2, respectively) using electrocorticography (ECoG). We found that tactile frequency-specific high-gamma (HG, 50-140 Hz) activities are seen in both S1 and S2 with different temporal dynamics during vibration (>100 Hz)...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29104374/gesture-decoding-using-ecog-signals-from-human-sensorimotor-cortex-a-pilot-study
#19
Yue Li, Shaomin Zhang, Yile Jin, Bangyu Cai, Marco Controzzi, Junming Zhu, Jianmin Zhang, Xiaoxiang Zheng
Electrocorticography (ECoG) has been demonstrated as a promising neural signal source for developing brain-machine interfaces (BMIs). However, many concerns about the disadvantages brought by large craniotomy for implanting the ECoG grid limit the clinical translation of ECoG-based BMIs. In this study, we collected clinical ECoG signals from the sensorimotor cortex of three epileptic participants when they performed hand gestures. The ECoG power spectrum in hybrid frequency bands was extracted to build a synchronous real-time BMI system...
2017: Behavioural Neurology
https://www.readbyqxmd.com/read/29062690/paroxysmal-dysphasia-in-a-68%C3%A2-year-old-man-enhancing-the-mri-spectrum
#20
Ugur Sener, William O Tatum, Alfredo Quinones-Hinojosa, Deependra Mahato, Anteneh M Feyissa
Brain tumor-related epilepsy is a common complication of primary and metastatic brain tumors with seizures often representing the first manifestation of the tumor. The size and location of the tumor can make detection of epileptiform discharges on scalp electroencephalogram and safe surgical resection challenging. We describe a case of a patient with glioblastoma multiforme presenting as dominant temporal lobe epilepsy. Seizures were manifest as episodes of speech arrest on a background of long-standing history of episodic speech difficulty and headache...
2017: Epilepsy & Behavior Case Reports
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