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Electrocorticography

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https://www.readbyqxmd.com/read/28176165/hemodynamic-changes-associated-with-interictal-spikes-induced-by-acute-models-of-focal-epilepsy-in-rats-a-simultaneous-electrocorticography-and-near-infrared-spectroscopy-study
#1
Viktoriya Osharina, Ardalan Aarabi, Mana Manoochehri, Mahdi Mahmoudzadeh, Fabrice Wallois
Interictal spikes can be generated by blocking GABAA receptor-mediated inhibition. The nature of the hemodynamic activities associated with interictal spikes in acute models of focal epilepsy based on GABA deactivation has not been determined. We analyzed systemic changes in hemodynamic signals associated with interictal spikes generated by acute models of focal epilepsy. Simultaneous ElectroCorticoGraphy (ECoG) and Near-InfraRed Spectroscopy (NIRS) recordings were obtained in vivo from adult Sprague-Dawley rat brain during semi-periodic focal interictal spikes induced by local cortical application of low doses of Penicillin G (PG) and Bicuculline Methiodide (BM) as GABA deactivation agents...
February 7, 2017: Brain Topography
https://www.readbyqxmd.com/read/28175501/210%C3%A2-human-sensorimotor-electrocorticography-spectral-dynamics-and-network-connectivity-during-a-simple-motor-task
#2
Vivek Buch, John Frederick Burke, Ashwin G Ramayya, Cameron Brandon, Eric Hudgins, Andrew Richardson, Timothy H Lucas
No abstract text is available yet for this article.
August 1, 2016: Neurosurgery
https://www.readbyqxmd.com/read/28156248/long-term-surgical-results-of-supplementary-motor-area-epilepsy-surgery
#3
Mario A Alonso-Vanegas, Daniel San-Juan, Ricardo M Buentello García, Carlos Castillo-Montoya, Horacio Sentíes-Madrid, Erika Brust Mascher, Paul Shkurovick Bialik, Carlos Trenado
OBJECTIVE Supplementary motor area (SMA) epilepsy is a well-known clinical condition; however, long-term surgical outcome reports are scarce and correspond to small series or isolated case reports. The aim of this study is to present the surgical results of SMA epilepsy patients treated at 2 reference centers in Mexico City. METHODS For this retrospective descriptive study (1999-2014), 52 patients underwent lesionectomy and/or corticectomy of the SMA that was guided by electrocorticography (ECoG). The clinical, neurophysiological, neuroimaging, and pathological findings are described...
February 3, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28137724/mirroring-in-the-human-brain-deciphering-the-spatial-temporal-patterns-of-the-human-mirror-neuron-system
#4
Anat Perry, Jennifer Stiso, Edward F Chang, Jack J Lin, Josef Parvizi, Robert T Knight
Embodied theories of cognition emphasize the central role of sensorimotor transformations in the representation of others' actions. Support for these theories is derived from the discovery of the mirror neuron system (MNS) in primates, from noninvasive techniques in humans, and from a limited number of intracranial studies. To understand the neural dynamics of the human MNS, more studies with precise spatial and temporal resolutions are essential. We used electrocorticography to define activation patterns in sensorimotor, parietal and/or frontal neuronal populations, during a viewing and grasping task...
January 30, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28121257/focal-changes-to-human-electrocorticography-with-drowsiness-a-novel-measure-of-local-sleep
#5
Jeremy D Slater, Mircea I Chelaru, Bryan J Hansen, Charles Beaman, Giridhar Kalamangalam, Nitin Tandon, Valentin Dragoi
Drowsiness may be defined as the progressive loss of cortical processing efficiency that occurs with time passing while awake. This loss of cortical processing efficiency is reflected in focal changes to the electroencephalogram, including islands of increased delta power concurrent with drop-offs in neuronal activity (i.e., focal cortical inactivity). The authors hypothesized that these focal changes are evidenced at individual electrodes by combination of increased instantaneous amplitude in delta band and decreased instantaneous frequency in theta-alpha band, permitting their categorization as "active" and "inactive...
January 25, 2017: Journal of Neuropsychiatry and Clinical Neurosciences
https://www.readbyqxmd.com/read/28117493/shedding-light-on-interictal-epileptic-spikes-an-in-vivo-study-using-fast-optical-signal-and-electrocorticography
#6
Mana Manoochehri, Mahdi Mahmoudzadeh, Victoria Osharina, Fabrice Wallois
OBJECTIVE: Interictal epileptic spikes (IESs), apart from being a key marker of epileptic neuronal networks, constitute a nice model of the widespread endogenous phenomenon of neuronal hypersynchronization. Many questions concerning the mechanisms that drive neurons to hypersynchronize remain unresolved, but synaptic as well as nonsynaptic events are likely to be involved. In this study, changes in optical properties of neural tissues were observed in rats with penicillin-induced IES using fast optical signal (FOS) concomitantly with electrocorticography (ECoG)...
January 24, 2017: Epilepsia
https://www.readbyqxmd.com/read/28097208/muscle-synergies-after-stroke-are-correlated-with-perilesional-high-gamma
#7
Jason Godlove, Tanuj Gulati, Ben Dichter, Edward Chang, Karunesh Ganguly
Movements can be factored into modules termed "muscle synergies". After stroke, abnormal synergies are linked to impaired movements; however, their neural basis is not understood. In a single subject, we examined how electrocorticography signals from the perilesional cortex were associated with synergies. The measured synergies contained a mix of both normal and abnormal patterns and were remarkably similar to those described in past work. Interestingly, we found that both normal and abnormal synergies were correlated with perilesional high gamma...
December 2016: Annals of Clinical and Translational Neurology
https://www.readbyqxmd.com/read/28095202/interpretation-of-the-precision-matrix-and-its-application-in-estimating-sparse-brain-connectivity-during-sleep-spindles-from-human-electrocorticography-recordings
#8
Anup Das, Aaron L Sampson, Claudia Lainscsek, Lyle Muller, Wutu Lin, John C Doyle, Sydney S Cash, Eric Halgren, Terrence J Sejnowski
The correlation method from brain imaging has been used to estimate functional connectivity in the human brain. However, brain regions might show very high correlation even when the two regions are not directly connected due to the strong interaction of the two regions with common input from a third region. One previously proposed solution to this problem is to use a sparse regularized inverse covariance matrix or precision matrix (SRPM) assuming that the connectivity structure is sparse. This method yields partial correlations to measure strong direct interactions between pairs of regions while simultaneously removing the influence of the rest of the regions, thus identifying regions that are conditionally independent...
January 17, 2017: Neural Computation
https://www.readbyqxmd.com/read/28088485/semantic-attributes-are-encoded-in-human-electrocorticographic-signals-during-visual-object-recognition
#9
Kyle Rupp, Matthew Roos, Griffin Milsap, Carlos Caceres, Christopher Ratto, Mark Chevillet, Nathan E Crone, Michael Wolmetz
Non-invasive neuroimaging studies have shown that semantic category and attribute information are encoded in neural population activity. Electrocorticography (ECoG) offers several advantages over non-invasive approaches, but the degree to which semantic attribute information is encoded in ECoG responses is not known. We recorded ECoG while patients named objects from 12 semantic categories and then trained high-dimensional encoding models to map semantic attributes to spectral-temporal features of the task-related neural responses...
January 11, 2017: NeuroImage
https://www.readbyqxmd.com/read/28079471/pre-implant-modeling-of-depth-lead-placement-in-white-matter-for-maximizing-the-extent-of-cortical-activation-during-direct-neurostimulation-therapy
#10
Leopoldo Cendejas Zaragoza, Richard W Byrne, Marvin A Rossi
INTRODUCTION: The objective of this work was to predict preoperatively the maximum extent to which direct stimulation therapy can propagate through an epileptic circuit for stabilizing refractory focal-onset epilepsy. A pre-surgical workflow is presented which comprises a computationally intensive process for calculating the volume of cortical activation (VOCA) surrounding cylindrical depth contacts virtually placed in white matter. The process employs an activation function (AF) derived from cable modeling of an axon...
March 2017: Neurological Research
https://www.readbyqxmd.com/read/28067149/navigation-assisted-trans-inferotemporal-cortex-selective-amygdalohippocampectomy-for-mesial-temporal-lobe-epilepsy-preserving-the-temporal-stem
#11
Haruhiko Kishima, Amami Kato, Satoru Oshino, Naoki Tani, Tomoyuki Maruo, Hui Ming Khoo, Takufumi Yanagisawa, Kotaro Edakawa, Maki Kobayashi, Masataka Tanaka, Koichi Hosomi, Masayuki Hirata, Toshiki Yoshimine
OBJECTIVE: Selective amygdalohippocampectomy (SAH) can be used to obtain satisfactory seizure control in patients with mesial temporal lobe epilepsy (MTLE). Several SAH procedures have been reported to achieve satisfactory outcomes for seizure control, but none yield fully satisfactory outcomes for memory function. We hypothesized that preserving the temporal stem might play an important role. To preserve the temporal stem, we developed a minimally invasive surgical procedure, 'neuronavigation-assisted trans-inferotemporal cortex SAH' (TITC-SAH)...
March 2017: Neurological Research
https://www.readbyqxmd.com/read/28040805/dynamic-contrast-enhanced-magnetic-resonance-imaging-dce-mri-combined-with-positron-emission-tomography-computed-tomography-pet-ct-and-video-electroencephalography-veeg-have-excellent-diagnostic-value-in-preoperative-localization-of-epileptic-foci-in-children
#12
Gui-Bin Wang, Wei Long, Xiao-Dong Li, Guang-Yin Xu, Ji-Xiang Lu
BACKGROUND To investigate the effect that dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) has on surgical decision making relative to video-electroencephalography (VEEG) and positron emission tomography-computed tomography (PET-CT), and if the differences in these variables translates to differences in surgical outcomes. MATERIAL AND METHODS A total of 166 children with epilepsy undergoing preoperative DCE-MRI, VEEG, and PET-CT examinations, surgical resection of epileptic foci, and intraoperative electrocorticography (ECoG) monitoring were enrolled...
January 1, 2017: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/28005045/-treatment-of-epilepsy-in-children-with-brain-tumors
#13
A A Kholin, V S Khalilov, I G Vasil'ev, E S Il'ina, N N Zavadenko
AIM: Symptomatic focal epilepsy is frequently caused by supratentorial brain tumors that may be surgically removed. The authors studied outcomes of surgical treatment depending on the use of electrocorticography c (ECoG). MATERIAL AND METHODS: Seventy-five children, aged 5-7 years, with supratentorial brain tumors were examined. Symptomatic epilepsy was found in 52 (69.3%) patients. Dysembryoplastic neuroepithelial tumors (DNET) and fibrillary astrocytomas were the most epileptogenic tumors...
2016: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
https://www.readbyqxmd.com/read/27956570/spatial-temporal-functional-mapping-of-language-at-the-bedside-with-electrocorticography
#14
Abbas Babajani-Feremi, James W Wheless, James W Papanicolaou, Yujing Wang, Matthew S Fifer, Adeen Flinker, Anna Korzeniewska, Mackenzie C Cervenka, William S Anderson, Dana F Boatman-Reich, Nathan E Crone
No abstract text is available yet for this article.
December 13, 2016: Neurology
https://www.readbyqxmd.com/read/27926827/decoding-hand-gestures-from-primary-somatosensory-cortex-using-high-density-ecog
#15
Mariana P Branco, Zachary V Freudenburg, Erik J Aarnoutse, Martin G Bleichner, Mariska J Vansteensel, Nick F Ramsey
Electrocorticography (ECoG) based Brain-Computer Interfaces (BCIs) have been proposed as a way to restore and replace motor function or communication in severely paralyzed people. To date, most motor-based BCIs have either focused on the sensorimotor cortex as a whole or on the primary motor cortex (M1) as a source of signals for this purpose. Still, target areas for BCI are not confined to M1, and more brain regions may provide suitable BCI control signals. A logical candidate is the primary somatosensory cortex (S1), which not only shares similar somatotopic organization to M1, but also has been suggested to have a role beyond sensory feedback during movement execution...
February 15, 2017: NeuroImage
https://www.readbyqxmd.com/read/27912169/non-harmonicity-in-high-frequency-components-of-the-intra-operative-corticogram-to-delineate-epileptogenic-tissue-during-surgery
#16
Evelien E Geertsema, Maryse A van 't Klooster, Nicole E C van Klink, Frans S S Leijten, Peter C van Rijen, Gerhard H Visser, Stiliyan N Kalitzin, Maeike Zijlmans
OBJECTIVE: We aimed to test the potential of auto-regressive model residual modulation (ARRm), an artefact-insensitive method based on non-harmonicity of the high-frequency signal, to identify epileptogenic tissue during surgery. METHODS: Intra-operative electrocorticography (ECoG) of 54 patients with refractory focal epilepsy were recorded pre- and post-resection at 2048Hz. The ARRm was calculated in one-minute epochs in which high-frequency oscillations (HFOs; fast ripples, 250-500Hz; ripples, 80-250Hz) and spikes were marked...
January 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/27912111/can-ictal-meg-obviate-the-need-for-phase-ii-monitoring-in-people-with-drug-refractory-epilepsy-a-prospective-observational-study
#17
Bhargavi Ramanujam, Kamal Bharti, Vibhin Viswanathan, Ajay Garg, Madhavi Tripathi, Chandrashekhar Bal, P Sarat Chandra, Manjari Tripathi
PURPOSE: To determine if ictal-magnetoencephalography (ictal-MEG) source localization (SL) added information towards delineating the ictal-onset zone (IOZ), whether and how it helped final decision-making in epilepsy-surgery. METHODS: Definite focal clusters on ictal-MEG were available for 32 DRE-patients, data was analyzed (single equivalent current dipole (ECD) model), SL done. Clinical history, long-term video-EEG (VEEG) monitoring, epilepsy-protocol MRI, FDG-PET, ictal-SPECT and interictal-MEG were discussed at the multispeciality Epilepsy Surgery Case-conference (ESC)...
October 31, 2016: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/27900947/continuous-decoding-of-human-grasp-kinematics-using-epidural-and-subdural-signals
#18
Robert D Flint, Joshua M Rosenow, Matthew C Tate, Marc W Slutzky
OBJECTIVE: Restoring or replacing function in paralyzed individuals will one day be achieved through the use of brain-machine interfaces. Regaining hand function is a major goal for paralyzed patients. Two competing prerequisites for the widespread adoption of any hand neuroprosthesis are accurate control over the fine details of movement, and minimized invasiveness. Here, we explore the interplay between these two goals by comparing our ability to decode hand movements with subdural and epidural field potentials (EFPs)...
November 30, 2016: Journal of Neural Engineering
https://www.readbyqxmd.com/read/27875590/spatio-temporal-progression-of-cortical-activity-related-to-continuous-overt-and-covert-speech-production-in-a-reading-task
#19
Jonathan S Brumberg, Dean J Krusienski, Shreya Chakrabarti, Aysegul Gunduz, Peter Brunner, Anthony L Ritaccio, Gerwin Schalk
How the human brain plans, executes, and monitors continuous and fluent speech has remained largely elusive. For example, previous research has defined the cortical locations most important for different aspects of speech function, but has not yet yielded a definition of the temporal progression of involvement of those locations as speech progresses either overtly or covertly. In this paper, we uncovered the spatio-temporal evolution of neuronal population-level activity related to continuous overt speech, and identified those locations that shared activity characteristics across overt and covert speech...
2016: PloS One
https://www.readbyqxmd.com/read/27862478/reductions-in-cortical-alpha-activity-enhancements-in-neural-responses-and-impaired-gap-detection-caused-by-sodium-salicylate-in-awake-guinea-pigs
#20
Joel I Berger, Ben Coomber, Mark N Wallace, Alan R Palmer
Tinnitus chronically affects between 10-15% of the population but, despite its prevalence, the underlying mechanisms are still not properly understood. One experimental model involves administration of high doses of sodium salicylate, as this is known to reliably induce tinnitus in both humans and animals. Guinea pigs were implanted with chronic electrocorticography (ECoG) electrode arrays, with silver-ball electrodes placed on the dura over left and right auditory cortex. Two more electrodes were positioned over the cerebellum to monitor auditory brainstem responses (ABRs)...
November 12, 2016: European Journal of Neuroscience
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