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Electrocorticography

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https://www.readbyqxmd.com/read/29678760/sub-millimeter-ecog-pitch-in-human-enables-higher-fidelity-cognitive-neural-state-estimation
#1
John Hermiz, Nicholas Rogers, Erik Kaestner, Mehran Ganji, Daniel R Cleary, Bob Carter, David Barba, Shadi Dayeh, Eric Halgren, Vikash Gilja
Electrocorticography (ECoG), electrophysiological recording from the pial surface of the brain, is a critical measurement technique for clinical neurophysiology, basic neurophysiology studies, and demonstrates great promise for the development of neural prosthetic devices for assistive applications and the treatment of neurological disorders. Recent advances in device engineering are poised to enable orders of magnitude increase in the resolution of ECoG without comprised measurement quality. This enhancement in cortical sensing enables the observation of neural dynamics from the cortical surface at the micrometer scale...
April 17, 2018: NeuroImage
https://www.readbyqxmd.com/read/29676287/electrophysiological-correlates-of-neurodegeneration-in-motor-and-non-motor-brain-regions-in-amyotrophic-lateral-sclerosis-implications-for-brain-computer-interfacing
#2
Philipp Kellmeyer, Moritz Grosse-Wentrup, Andreas Schulze-Bonhage, Ulf Ziemann, Tonio Ball
For patients with amyotrophic lateral sclerosis (ALS) who are suffering from severe communication or motor problems, brain-computer interfaces (BCIs) can improve the quality of life and patient autonomy. However, current BCI systems are not as widely used as their potential and patient demand would let assume. This underutilization is a result of technological as well as user-based limitations but also of the comparatively poor performance of currently existing BCIs in patients with late-stage ALS, particularly in the locked-in state...
April 20, 2018: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29674950/decoding-speech-with-integrated-hybrid-signals-recorded-from-the-human-ventral-motor-cortex
#3
Kenji Ibayashi, Naoto Kunii, Takeshi Matsuo, Yohei Ishishita, Seijiro Shimada, Kensuke Kawai, Nobuhito Saito
Restoration of speech communication for locked-in patients by means of brain computer interfaces (BCIs) is currently an important area of active research. Among the neural signals obtained from intracranial recordings, single/multi-unit activity (SUA/MUA), local field potential (LFP), and electrocorticography (ECoG) are good candidates for an input signal for BCIs. However, the question of which signal or which combination of the three signal modalities is best suited for decoding speech production remains unverified...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29662089/time-rescaling-reproduces-eeg-behavior-during-transition-from-propofol-anesthesia-induced-unconsciousness-to-consciousness
#4
S Boussen, A Spiegler, C Benar, M Carrère, F Bartolomei, P Metellus, R Voituriez, L Velly, N Bruder, A Trébuchon
General anesthesia (GA) is a reversible manipulation of consciousness whose mechanism is mysterious at the level of neural networks leaving space for several competing hypotheses. We recorded electrocorticography (ECoG) signals in patients who underwent intracranial monitoring during awake surgery for the treatment of cerebral tumors in functional areas of the brain. Therefore, we recorded the transition from unconsciousness to consciousness directly on the brain surface. Using frequency resolved interferometry; we studied the intermediate ECoG frequencies (4-40 Hz)...
April 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29661966/pallidal-deep-brain-stimulation-disrupts-pallidal-beta-oscillations-and-coherence-with-primary-motor-cortex-in-parkinson-s-disease
#5
Doris D Wang, Coralie de Hemptinne, Svjetlana Miocinovic, Jill L Ostrem, Nicholas B Galifianakis, Marta San Luciano, Philip A Starr
In Parkinson's disease (PD), subthalamic nucleus beta band oscillations are decreased by therapeutic deep brain stimulation (DBS) and this has been proposed as important to the mechanism of therapy. The globus pallidus is a common alternative target for PD with similar motor benefits as subthalamic DBS, but effects of pallidal stimulation in PD are not well studied, and effects of pallidal DBS on cortical function in PD are unknown. Here, in 20 PD and 14 isolated dystonia human patients of both genders undergoing pallidal DBS lead implantation, we recorded local field potentials (LFPs) from the globus pallidus and in a subset of these, recorded simultaneous sensorimotor cortex electrocorticography (ECoG) potentials...
April 16, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29626167/intracranial-electrophysiology-reveals-reproducible-intrinsic-functional-connectivity-within-human-brain-networks
#6
Aaron Kucyi, Jessica Schrouff, Stephan Bickel, Brett L Foster, James M Shine, Josef Parvizi
Evidence for intrinsic functional connectivity (FC) within the human brain is largely from neuroimaging studies of hemodynamic activity. Data are lacking from anatomically precise electrophysiological recordings in the most widely studied nodes of human brain networks. Here we used a combination of fMRI and electrocorticography (ECoG) in five human neurosurgical patients with electrodes in the canonical "default" (medial prefrontal and posteromedial cortex), "dorsal attention" (frontal eye fields and superior parietal lobule) and "frontoparietal control" (inferior parietal lobule and dorsolateral prefrontal cortex) networks...
April 6, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29588964/application-of-rns-in-refractory-epilepsy-targeting-insula
#7
Hai Chen, Patricia Dugan, Derek J Chong, Anli Liu, Werner Doyle, Daniel Friedman
Although responsive neurostimulation (RNS) is approved for treatment of resistant focal epilepsy in adults, little is known about response to treatment of specific cortical targets. We describe the experience of RNS targeting the insular lobe. We identified patients who had RNS implantation with at least one electrode within the insula between April 2014 and October 2015. We performed a retrospective review of preoperative clinical features, imaging, electrocardiogram (EEG), intraoperative electrocorticography (ECoG), and postoperative seizure outcome...
September 2017: Epilepsia Open
https://www.readbyqxmd.com/read/29576498/evidence-of-transcranial-direct-current-stimulation-generated-electric-fields-at-subthalamic-level-in-human-brain-in-vivo
#8
Pratik Y Chhatbar, Steven A Kautz, Istvan Takacs, Nathan C Rowland, Gonzalo J Revuelta, Mark S George, Marom Bikson, Wuwei Feng
BACKGROUND: Transcranial direct current stimulation (tDCS) is a promising brain modulation technique for several disease conditions. With this technique, some portion of the current penetrates through the scalp to the cortex and modulates cortical excitability, but a recent human cadaver study questions the amount. This insufficient intracerebral penetration of currents may partially explain the inconsistent and mixed results in tDCS studies to date. Experimental validation of a transcranial alternating current stimulation-generated electric field (EF) in vivo has been performed on the cortical (using electrocorticography, ECoG, electrodes), subcortical (using stereo electroencephalography, SEEG, electrodes) and deeper thalamic/subthalamic levels (using DBS electrodes)...
March 13, 2018: Brain Stimulation
https://www.readbyqxmd.com/read/29571716/mapping-working-memory-retrieval-in-space-and-in-time-a-combined-electroencephalography-and-electrocorticography-approach
#9
Qiong Zhang, Marieke van Vugt, Jelmer P Borst, John R Anderson
In this study, we investigated the time course and neural correlates of the retrieval process underlying visual working memory. We made use of a rare dataset in which the same task was recorded using both scalp electroencephalography (EEG) and Electrocorticography (ECoG), respectively. This allowed us to examine with great spatial and temporal detail how the retrieval process works, and in particular how the medial temporal lobe (MTL) is involved. In each trial, participants judged whether a probe face had been among a set of recently studied faces...
March 20, 2018: NeuroImage
https://www.readbyqxmd.com/read/29534521/epilepsy-surgery-for-skull-base-temporal-lobe-encephaloceles-should-we-spare-the-hippocampus-from-resection
#10
Firas Bannout, Sheri Harder, Michael Lee, Alexander Zouros, Ravi Raghavan, Travis Fogel, Kenneth De Los Reyes, Travis Losey
The neurosurgical treatment of skull base temporal encephalocele for patients with epilepsy is variable. We describe two adult cases of temporal lobe epilepsy (TLE) with spheno-temporal encephalocele, currently seizure-free for more than two years after anterior temporal lobectomy (ATL) and lesionectomy sparing the hippocampus without long-term intracranial electroencephalogram (EEG) monitoring. Encephaloceles were detected by magnetic resonance imaging (MRI) and confirmed by maxillofacial head computed tomography (CT) scans...
March 12, 2018: Brain Sciences
https://www.readbyqxmd.com/read/29534399/-microsurgical-treatment-of-temporal-cavernous-malformation-presenting-with-epilepsy
#11
F Wang, D N Feng, Y Liu, Z Liu, T Sun
Objective: To evaluate the efficacy and safety of microsurgical in the treatment of temporal lobe cerebral cavernous malformation (CCM) with epilepsy. Methods: Temporal lobe CCM patients with epilepsy admitted to our department were collected from January 2010 to September 2016. Locations of the CCM were divided into (1) lateral-lateral to the collateral sulcus; (2) mesial-mesial to the collateral sulcus. In the lateral group, patients were underwent intraoperative electrocorticography (ECoG)-guided resection of lesion and hemosiderin rim...
March 6, 2018: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/29529085/a-non-invasive-quantitative-study-of-broadband-spectral-responses-in-human-visual-cortex
#12
Eline R Kupers, Helena X Wang, Kaoru Amano, Kendrick N Kay, David J Heeger, Jonathan Winawer
Currently, non-invasive methods for studying the human brain do not routinely and reliably measure spike-rate-dependent signals, independent of responses such as hemodynamic coupling (fMRI) and subthreshold neuronal synchrony (oscillations and event-related potentials). In contrast, invasive methods-microelectrode recordings and electrocorticography (ECoG)-have recently measured broadband power elevation in field potentials (~50-200 Hz) as a proxy for locally averaged spike rates. Here, we sought to detect and quantify stimulus-related broadband responses using magnetoencephalography (MEG)...
2018: PloS One
https://www.readbyqxmd.com/read/29518565/distinct-phase-amplitude-couplings-distinguish-cognitive-processes-in-human-attention
#13
Ravi V Chacko, Byungchan Kim, Suh Woo Jung, Amy L Daitch, Jarod L Roland, Nicholas V Metcalf, Maurizio Corbetta, Gordon L Shulman, Eric C Leuthardt
Spatial attention is the cognitive function that coordinates the selection of visual stimuli with appropriate behavioral responses. Recent studies have reported that phase-amplitude coupling (PAC) of low and high frequencies covaries with spatial attention, but differ on the direction of covariation and the frequency ranges involved. We hypothesized that distinct phase-amplitude frequency pairs have differentiable contributions during tasks that manipulate spatial attention. We investigated this hypothesis with electrocorticography (ECoG) recordings from participants who engaged in a cued spatial attention task...
March 5, 2018: NeuroImage
https://www.readbyqxmd.com/read/29513147/postoperative-seizure-outcome-guided-machine-learning-for-interictal-electrocorticography-in-neocortical-epilepsy
#14
Seong-Cheol Park, Chun Kee Chung
BACKGROUND AND PURPOSE: The objective of this study was to introduce a new machine learning guided by outcome of resective epilepsy surgery defined as the presence/absence of seizures to improve data mining for interictal pathologic activities in neocortical epilepsy. METHODS: Electrocorticographies for 39 patients with medically intractable neocortical epilepsy were analyzed. We separately analyzed 38 frequencies from 0.9 to 800 Hz including both high-frequency activities and low-frequency activities to select bands related to seizure outcome...
March 7, 2018: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29510282/a-multimodal-approach-for-radical-excision-of-focal-cortical-dysplasia-by-combining-advanced-mri-data-to-intraoperative-ultrasound-electrocorticography-and-cortical-stimulation-a-preliminary-experience
#15
Giovanni Tringali, Beatrice Bono, Ivano Dones, Roberto Cordella, Giuseppe Didato, Flavio Villani, Francesco Prada
BACKGROUND: Type II focal cortical dysplasia is the most common malformation of cortical development associated with drug resistant epilepsy and susceptible to surgical resection. Although advanced imaging modalities are nowadays capable to detect the majority of such cortical disorders, it is still a challenge for the surgeon to visualize them intraoperatively. The lack of direct boundaries' identification between normal brain and subtle dysplastic tissue may explain poor results in terms of seizure-free patients compared to other forms of epilepsy...
March 3, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29507407/promises-and-limitations-of-human-intracranial-electroencephalography
#16
REVIEW
Josef Parvizi, Sabine Kastner
Intracranial electroencephalography (iEEG), also known as electrocorticography when using subdural grid electrodes or stereotactic EEG when using depth electrodes, is blossoming in various fields of human neuroscience. In this article, we highlight the potentials of iEEG in exploring functions of the human brain while also considering its limitations. The iEEG signal provides anatomically precise information about the selective engagement of neuronal populations at the millimeter scale and the temporal dynamics of their engagement at the millisecond scale...
March 5, 2018: Nature Neuroscience
https://www.readbyqxmd.com/read/29499018/electrical-stimulation-mapping-with-stereo-eeg-electrodes
#17
Jeffrey W Britton
The practice of stereo-EEG (SEEG) is expanding. Electrical stimulation mapping remains an important part of the surgical evaluation process in SEEG, as it is in subdural electrocorticography cases. Because the technique and electrodes used in SEEG and electrocorticography are distinct, the clinician needs to be aware of the important differences between these techniques when performing electrical stimulation mapping. In this review, the advantages, disadvantages, and potential safety concerns related to electrical stimulation mapping in SEEG are discussed...
March 2018: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29491453/new-thin-film-surface-electrode-array-enables-brain-mapping-with-high-spatial-acuity-in-rodents
#18
W S Konerding, U P Froriep, A Kral, P Baumhoff
In neuroscience, single-shank penetrating multi-electrode arrays are standard for sequentially sampling several cortical sites with high spatial and temporal resolution, with the disadvantage of neuronal damage. Non-penetrating surface grids used in electrocorticography (ECoG) permit simultaneous recording of multiple cortical sites, with limited spatial resolution, due to distance to neuronal tissue, large contact size and high impedances. Here we compared new thin-film parylene C ECoG grids, covering the guinea pig primary auditory cortex, with simultaneous recordings from penetrating electrode array (PEAs), inserted through openings in the grid material...
February 28, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29490917/high-frequency-oscillations-in-awake-patients-undergoing-brain-tumor-related-epilepsy-surgery
#19
Anteneh M Feyissa, Gregory A Worrell, William O Tatum, Deependra Mahato, Benjamin H Brinkmann, Steven S Rosenfeld, Karim ReFaey, Perry S Bechtle, Alfredo Quinones-Hinojosa
OBJECTIVE: To examine the relationship between high-frequency oscillations (HFOs) and the presence of preoperative seizures, World Health Organization tumor grade, and isocitrate dehydrogenase 1 (IDH1) mutational status in gliomas. METHODS: We retrospectively studied intraoperative electrocorticography recorded in 16 patients with brain tumor (12 presenting with seizures) who underwent awake craniotomy and surgical resection between September 2016 and June 2017...
February 28, 2018: Neurology
https://www.readbyqxmd.com/read/29488838/spatiotemporal-evolution-of-focal-epileptiform-activity-from-surface-and-laminar-field-recordings-in-cat-neocortex
#20
Hank Bink, Madineh Sedigh-Sarvestani, Ivan Fernandez-Lamo, Lohith Kini, Hoameng Ung, Duygu Kuzum, Flavia Vitale, Brian Litt, Diego Contreras
New devices that use targeted electrical stimulation to treat refractory localization-related epilepsy have shown great promise, though it is not well known which targets most effectively prevent the initiation and spread of seizures. To better understand how the brain transitions from healthy to seizing on a local scale, we induced focal epileptiform activity in the visual cortex of five anesthetized cats with local application of the GABAA blocker picrotoxin while simultaneously recording local field potentials on a high-resolution electrocorticography array and laminar depth probes...
February 28, 2018: Journal of Neurophysiology
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