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Electrocorticography

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https://www.readbyqxmd.com/read/29468672/ca-v-3-2-drives-sustained-burst-firing-which-is-critical-for-absence-seizure-propagation-in-reticular-thalamic-neurons
#1
Stuart M Cain, John R Tyson, Hyun-Beom Choi, Rebecca Ko, Paulo J C Lin, Jeffrey M LeDue, Kim L Powell, Louis-Philippe Bernier, Ravi L Rungta, Yi Yang, Pieter R Cullis, Terence J O'Brien, Brian A MacVicar, Terrance P Snutch
OBJECTIVE: Genetic alterations have been identified in the CACNA1H gene, encoding the CaV 3.2 T-type calcium channel in patients with absence epilepsy, yet the precise mechanisms relating to seizure propagation and spike-wave-discharge (SWD) pacemaking remain unknown. Neurons of the thalamic reticular nucleus (TRN) express high levels of CaV 3.2 calcium channels, and we investigated whether a gain-of-function mutation in the Cacna1h gene in Genetic Absence Epilepsy Rats from Strasbourg (GAERS) contributes to seizure propagation and pacemaking in the TRN...
February 21, 2018: Epilepsia
https://www.readbyqxmd.com/read/29438820/intraoperative-hippocampal-electrocorticography-frequently-captures-electrographic-seizures-and-correlates-with-hippocampal-pathology
#2
Aashit K Shah, Darren Fuerst, Sandeep Mittal
OBJECTIVE: Relationship between electrographic seizures on hippocampal electrocorticography (IH-ECoG) and presence/type of hippocampal pathology remains unclear. METHODS: IH-ECoG was recorded for 10-20 min from the ventricular surface of the hippocampus following removal of the temporal neocortex in 40 consecutive patients. Correlation between intraoperative hippocampal seizures and preoperative MRI, hippocampal histopathology, and EEG from invasive monitoring was determined...
February 2, 2018: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29430213/naplib-an-open-source-toolbox-for-real-time-and-offline-neural-acoustic-processing
#3
Bahar Khalighinejad, Tasha Nagamine, Ashesh Mehta, Nima Mesgarani
In this paper, we introduce the Neural Acoustic Processing Library (NAPLib), a toolbox containing novel processing methods for real-time and offline analysis of neural activity in response to speech. Our method divides the speech signal and resultant neural activity into segmental units (e.g., phonemes), allowing for fast and efficient computations that can be implemented in real-time. NAPLib contains a suite of tools that characterize various properties of the neural representation of speech, which can be used for functionality such as characterizing electrode tuning properties, brain mapping and brain computer interfaces...
March 2017: Proceedings of the ... IEEE International Conference on Acoustics, Speech, and Signal Processing
https://www.readbyqxmd.com/read/29427847/computationally-optimized-ecog-stimulation-with-local-safety-constraints
#4
Seyhmus Guler, Moritz Dannhauer, Biel Roig-Solvas, Alexis Gkogkidis, Rob Macleod, Tonio Ball, Jeffrey G Ojemann, Dana H Brooks
Direct stimulation of the cortical surface is used clinically for cortical mapping and modulation of local activity. Future applications of cortical modulation and brain-computer interfaces may also use cortical stimulation methods. One common method to deliver current is through electrocorticography (ECoG) stimulation in which a dense array of electrodes are placed subdurally or epidurally to stimulate the cortex. However, proximity to cortical tissue limits the amount of current that can be delivered safely...
February 7, 2018: NeuroImage
https://www.readbyqxmd.com/read/29422883/detecting-cortical-spreading-depolarization-with-full-band-scalp-electroencephalography-an-illusion
#5
Jeannette Hofmeijer, C R van Kaam, Babette van de Werff, Sarah E Vermeer, Marleen C Tjepkema-Cloostermans, Michel J A M van Putten
Introduction: There is strong evidence suggesting detrimental effects of cortical spreading depolarization (CSD) in patients with acute ischemic stroke and severe traumatic brain injury. Previous studies implicated scalp electroencephalography (EEG) features to be correlates of CSD based on retrospective analysis of EEG epochs after having detected "CSD" in time aligned electrocorticography. We studied the feasibility of CSD detection in a prospective cohort study with continuous EEG in 18 patients with acute ischemic stroke and 18 with acute severe traumatic brain injury...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29414401/predicting-postoperative-language-outcome-using-presurgical-fmri-meg-tms-and-high-gamma-ecog
#6
Abbas Babajani-Feremi, Christen M Holder, Shalini Narayana, Stephen P Fulton, Asim F Choudhri, Frederick A Boop, James W Wheless
OBJECTIVE: To predict the postoperative language outcome using the support vector regression (SVR) and results of multimodal presurgical language mapping. METHODS: Eleven patients with epilepsy received presurgical language mapping using functional MRI (fMRI), magnetoencephalography (MEG), transcranial magnetic stimulation (TMS), and high-gamma electrocorticography (hgECoG), as well as pre- and postoperative neuropsychological evaluation of language. We constructed 15 (24-1) SVR models by considering the extent of resected language areas identified by all subsets of four modalities as input feature vector and the postoperative language outcome as output...
March 2018: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29410439/efficient-communication-dynamics-on-macro-connectome-and-the-propagation-speed
#7
Masanori Shimono, Naomichi Hatano
Global communication dynamics in the brain can be captured using fMRI, MEG, or electrocorticography (ECoG), and the global slow dynamics often represent anatomical constraints. Complementary single-/multi-unit recordings have described local fast temporal dynamics. However, global fast temporal dynamics remain incompletely understood with considering of anatomical constraints. Therefore, we compared temporal aspects of cross-area propagations of single-unit recordings and ECoG, and investigated their anatomical bases...
February 6, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29381703/sozrank-a-new-approach-for-localizing-the-epileptic-seizure-onset-zone
#8
Yonathan Murin, Jeremy Kim, Josef Parvizi, Andrea Goldsmith
Epilepsy is one of the most common neurological disorders affecting about 1% of the world population. For patients with focal seizures that cannot be treated with antiepileptic drugs, the common treatment is a surgical procedure for removal of the seizure onset zone (SOZ). In this work we introduce an algorithm for automatic localization of the seizure onset zone (SOZ) in epileptic patients based on electrocorticography (ECoG) recordings. The proposed algorithm builds upon the hypothesis that the abnormal excessive (or synchronous) neuronal activity in the brain leading to seizures starts in the SOZ and then spreads to other areas in the brain...
January 30, 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29378977/real-time-classification-of-auditory-sentences-using-evoked-cortical-activity-in-humans
#9
David Aaron Moses, Matthew Leonard, Edward F Chang
OBJECTIVE: Recent research has characterized the anatomical and functional basis of speech perception in the human auditory cortex. These advances have made it possible to decode speech information from activity in brain regions like the superior temporal gyrus, but no published work has demonstrated this ability in real-time, which is necessary for neuroprosthetic brain-computer interfaces. APPROACH: Here, we introduce a real-time Neural Speech Recognition (rtNSR) software package, which was used to classify spoken input from high-resolution electrocorticography signals in real-time...
January 30, 2018: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29364932/prediction-of-movement-intention-using-connectivity-within-motor-related-network-an-electrocorticography-study
#10
Byeong Keun Kang, June Sic Kim, Seokyun Ryun, Chun Kee Chung
Most brain-machine interface (BMI) studies have focused only on the active state of which a BMI user performs specific movement tasks. Therefore, models developed for predicting movements were optimized only for the active state. The models may not be suitable in the idle state during resting. This potential maladaptation could lead to a sudden accident or unintended movement resulting from prediction error. Prediction of movement intention is important to develop a more efficient and reasonable BMI system which could be selectively operated depending on the user's intention...
2018: PloS One
https://www.readbyqxmd.com/read/29364119/consistency-of-long-term-subdural-electrocorticography-in-humans
#11
Ewan S Nurse, Sam E John, Dean R Freestone, Thomas J Oxley, Hoameng Ung, Samuel F Berkovic, Terence J O'Brien, Mark J Cook, David B Grayden
OBJECTIVE: Subdural electrocorticography (ECoG) can provide a robust control signal for a brain-computer interface (BCI). However, the long-term recording properties of ECoG are poorly understood as most ECoG studies in the BCI field have only used signals recorded for less than 28 days. We assessed human ECoG recordings over durations of many months to investigate changes to recording quality that occur with long-term implantation. METHODS: We examined changes in signal properties over time from 15 ambulatory humans who had continuous subdural ECoG monitoring for 184-766 days...
February 2018: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/29362974/mapping-brain-activity-with-electrocorticography-resolution-properties-and-robustness-of-inverse-solutions
#12
Chiara Todaro, Laura Marzetti, Pedro A Valdés Sosa, Pedro A Valdés-Hernandez, Vittorio Pizzella
Electrocorticography (ECoG) is an electrophysiological technique that records brain activity directly from the cortical surface with high temporal (ms) and spatial (mm) resolution. Its major limitations are in the high invasiveness and in the restricted field-of-view of the electrode grid, which partially covers the cortex. To infer brain activity at locations different from just below the electrodes, it is necessary to solve the electromagnetic inverse problem. Limitations in the performance of source reconstruction algorithms from ECoG have been, to date, only partially addressed in the literature, and a systematic evaluation is still lacking...
January 23, 2018: Brain Topography
https://www.readbyqxmd.com/read/29336029/sudden-unexpected-death-in-epilepsy-in-patients-treated-with-brain-responsive-neurostimulation
#13
Orrin Devinsky, Daniel Friedman, Robert B Duckrow, Nathan B Fountain, Ryder P Gwinn, James W Leiphart, Anthony M Murro, Paul C Van Ness
OBJECTIVE: To study the incidence and clinical features of sudden unexpected death in epilepsy (SUDEP) in patients treated with direct brain-responsive stimulation with the RNS System. METHODS: All deaths in patients treated in clinical trials (N = 256) or following U.S. Food and Drug Administration (FDA) approval (N = 451) through May 5, 2016, were adjudicated for SUDEP. RESULTS: There were 14 deaths among 707 patients (2208 postimplantation years), including 2 possible, 1 probable, and 4 definite SUDEP events...
January 16, 2018: Epilepsia
https://www.readbyqxmd.com/read/29306849/verbal-learning-and-memory-outcome-in-selective-amygdalohippocampectomy-versus-temporal-lobe-resection-in-patients-with-hippocampal-sclerosis
#14
Mette Thrane Foged, Kirsten Vinter, Louise Stauning, Troels W Kjær, Brice Ozenne, Sándor Beniczky, Olaf B Paulson, Flemming Find Madsen, Lars H Pinborg
PURPOSE: With the advent of new very selective techniques like thermal laser ablation to treat drug-resistant focal epilepsy, the controversy of resection size in relation to seizure outcome versus cognitive deficits has gained new relevance. The purpose of this study was to test the influence of the selective amygdalohippocampectomy (SAH) versus nonselective temporal lobe resection (TLR) on seizure outcome and cognition in patients with mesial temporal lobe epilepsy (MTLE) and histopathological verified hippocampal sclerosis (HS)...
January 4, 2018: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29306539/random-ensemble-learning-for-eeg-classification
#15
Mohammad-Parsa Hosseini, Dario Pompili, Kost Elisevich, Hamid Soltanian-Zadeh
Real-time detection of seizure activity in epilepsy patients is critical in averting seizure activity and improving patients' quality of life. Accurate evaluation, presurgical assessment, seizure prevention, and emergency alerts all depend on the rapid detection of seizure onset. A new method of feature selection and classification for rapid and precise seizure detection is discussed wherein informative components of electroencephalogram (EEG)-derived data are extracted and an automatic method is presented using infinite independent component analysis (I-ICA) to select independent features...
January 3, 2018: Artificial Intelligence in Medicine
https://www.readbyqxmd.com/read/29299382/an-interspecies-comparative-study-of-invasive-electrophysiological-functional-connectivity
#16
Kaitlyn Casimo, Lila H Levinson, Stavros Zanos, C Alexis Gkogkidis, Tonio Ball, Eberhard Fetz, Kurt E Weaver, Jeffrey G Ojemann
Introduction: Resting-state connectivity patterns have been observed in humans and other mammal species, and can be recorded using a variety of different technologies. Functional connectivity has been previously compared between species using resting-state fMRI, but not in electrophysiological studies. Methods: We compared connectivity with implanted electrodes in humans (electrocorticography) to macaques and sheep (microelectrocorticography), which are capable of recording neural data at high frequencies with spatial precision...
December 2017: Brain and Behavior
https://www.readbyqxmd.com/read/29241172/neurophysiological-monitoring-and-awake-craniotomy-for-resection-of-intracranial-gliomas
#17
Taiichi Saito, Manabu Tamura, Mikhail F Chernov, Soko Ikuta, Yoshihiro Muragaki, Takashi Maruyama
Aggressive resection of intracranial gliomas has a positive impact on patients' prognosis, but is associated with a risk of neurological complications. For preservation of brain functions and avoidance of major postoperative morbidity various methods of intraoperative neurophysiological monitoring have been introduced into clinical practice. At present, somatosensory evoked potentials (SSEP), motor evoked potentials (MEP), visual evoked potentials (VEP), brainstem auditory evoked potentials (BAEP), and electrocorticography (ECoG) are used routinely during neurosurgical procedures...
2018: Progress in Neurological Surgery
https://www.readbyqxmd.com/read/29204348/non-ictal-onset-zone-a-window-to-ictal-dynamics
#18
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
#19
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
#20
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
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