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Electrocorticography

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https://www.readbyqxmd.com/read/29033809/characterizing-neural-entrainment-to-hierarchical-linguistic-units-using-electroencephalography-eeg
#1
Nai Ding, Lucia Melloni, Aotian Yang, Yu Wang, Wen Zhang, David Poeppel
To understand speech, listeners have to combine the words they hear into phrases and sentences. Recent magnetoencephalography (MEG) and electrocorticography (ECoG) studies show that cortical activity is concurrently entrained/synchronized to the rhythms of multiple levels of linguistic units including words, phrases, and sentences. Here we investigate whether this phenomenon can be observed using electroencephalography (EEG), a technique that is more widely available than MEG and ECoG. We show that the EEG responses concurrently track the rhythms of hierarchical linguistic units such as syllables/words, phrases, and sentences...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29027858/role-of-the-temporal-pole-in-temporal-lobe-epilepsy-seizure-networks-an-intracranial-electrode-investigation
#2
Taylor J Abel, Royce W Woodroffe, Kirill V Nourski, Toshio Moritani, Aristides A Capizzano, Patricia Kirby, Hiroto Kawasaki, Matthew Howard, Mary Ann Werz
OBJECTIVE A convergence of clinical research suggests that the temporal pole (TP) plays an important and potentially underappreciated role in the genesis and propagation of seizures in temporal lobe epilepsy (TLE). Understanding its role is becoming increasingly important because selective resections for medically intractable TLE spare temporopolar cortex (TPC). The purpose of this study was to characterize the role of the TPC in TLE after using dense electrocorticography (ECoG) recordings in patients undergoing invasive monitoring for medically intractable TLE...
October 13, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29017082/temporal-lobe-surgery-for-intractable-epilepsy-in-children-what-to-do-with-the-hippocampus
#3
Mony Benifla, Odeya Bennet-Back, Zamir Shorer, Iris Noyman, Rima Bar-Yosef, Dana Ekstein
PURPOSE: Resection of the hippocampus can cause verbal memory decline, especially in the pediatric population. Thus, preservation of the hippocampus can be crucial for the quality of life of children with intractable temporal lobe epilepsy (TLE) who are candidates for epilepsy surgery. We investigated techniques that determine whether the hippocampus is part of the epileptogenic zone and the outcomes of pediatric surgery aimed to spare the hippocampus. METHODS: We accessed data of children with normal hippocampus on MRI, who underwent surgery for medically refractory TLE...
October 2, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/28993242/a-distinct-microrna-expression-profile-is-associated-with-%C3%AE-11-c-methyl-l-tryptophan-amt-pet-uptake-in-epileptogenic-cortical-tubers-resected-from-patients-with-tuberous-sclerosis-complex
#4
Shruti Bagla, Daniela Cukovic, Eishi Asano, Sandeep Sood, Aimee Luat, Harry T Chugani, Diane C Chugani, Alan A Dombkowski
Tuberous sclerosis complex (TSC) is characterized by hamartomatous lesions in various organs and arises due to mutations in the TSC1 or TSC2 genes. TSC mutations lead to a range of neurological manifestations including epilepsy, cognitive impairment, autism spectrum disorders (ASD), and brain lesions that include cortical tubers. There is evidence that seizures arise at or near cortical tubers, but it is unknown why some tubers are epileptogenic while others are not. We have previously reported increased tryptophan metabolism measured with α[(11)C]-methyl-l-tryptophan (AMT) positron emission tomography (PET) in epileptogenic tubers in approximately two-thirds of patients with tuberous sclerosis and intractable epilepsy...
October 7, 2017: Neurobiology of Disease
https://www.readbyqxmd.com/read/28983488/neurovascular-function-recovery-after-focal-ischemic-stroke-by-enhancing-cerebral-collateral-circulation-via-peripheral-stimulation-mediated-interarterial-anastomosis
#5
Han-Chi Pan, Lun-De Liao, Yu-Chun Lo, Jia-Wei Chen, Han-Lin Wang, Li Yang, Yao-Wen Liang, Po-Yu Huang, Ming-Hsun Yang, You-Yin Chen
Current treatments for ischemic stroke have focused on the administration of a tissue plasminogen activator, although the associated side effects and subsequent reperfusion injury remain challenging. Peripheral electrical stimulation has shed light on therapeutic interventions for ischemia by increasing cerebral blood flow (CBF) to the target region through collateral circulation, although the mechanism remains elusive. Here, a focal photothrombotic ischemic (PTI) stroke was induced in the right hemispheric primary somatosensory forelimb cortex (S1FL) of rat brains, and the therapeutic effects of forelimb and hindlimb stimulation were characterized at the contralesional S1FL...
July 2017: Neurophotonics
https://www.readbyqxmd.com/read/28964504/anaesthesia-management-in-epilepsy-surgery-with-intraoperative-electrocorticography
#6
S Pacreu, E Vilà, L Moltó, D Bande, M Rueda, J L Fernández Candil
Epilepsy surgery is a well-established treatment for patients with drug-resistant epilepsy. The success of surgery depends on precise presurgical localisation of the epileptogenic zone. There are different techniques to determine its location and extension. Despite the improvements in non-invasive diagnostic tests, in patients for whom these tests are inconclusive, invasive techniques such intraoperative electrocorticography will be needed. Intraoperative electrocorticography is used to guide surgical resection of the epileptogenic lesion and to verify that the resection has been completed...
September 27, 2017: Revista Española de Anestesiología y Reanimación
https://www.readbyqxmd.com/read/28899023/the-circadian-profile-of-epilepsy-improves-seizure-forecasting
#7
Philippa J Karoly, Hoameng Ung, David B Grayden, Levin Kuhlmann, Kent Leyde, Mark J Cook, Dean R Freestone
It is now established that epilepsy is characterized by periodic dynamics that increase seizure likelihood at certain times of day, and which are highly patient-specific. However, these dynamics are not typically incorporated into seizure prediction algorithms due to the difficulty of estimating patient-specific rhythms from relatively short-term or unreliable data sources. This work outlines a novel framework to develop and assess seizure forecasts, and demonstrates that the predictive power of forecasting models is improved by circadian information...
August 1, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28880766/establishing-a-right-frontal-beta-signature-for-stopping-action-in-scalp-electroencephalography-implications-for-testing-inhibitory-control-in-other-task-contexts
#8
Johanna Wagner, Jan R Wessel, Ayda Ghahremani, Adam R Aron
Many studies have examined the rapid stopping of action as a proxy of human self-control. Several methods have shown that a critical focus for stopping is the right inferior frontal cortex. Moreover, electrocorticography studies have shown beta band power increases in the right inferior frontal cortex and in the BG for successful versus failed stop trials, before the time of stopping elapses, perhaps underpinning a prefrontal-BG network for inhibitory control. Here, we tested whether the same signature might be visible in scalp electroencephalography (EEG)-which would open important avenues for using this signature in studies of the recruitment and timing of prefrontal inhibitory control...
September 7, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/28861464/organic-electronics-for-high-resolution-electrocorticography-of-the-human-brain
#9
Dion Khodagholy, Jennifer N Gelinas, Zifang Zhao, Malcolm Yeh, Michael Long, Jeremy D Greenlee, Werner Doyle, Orrin Devinsky, György Buzsáki
Localizing neuronal patterns that generate pathological brain signals may assist with tissue resection and intervention strategies in patients with neurological diseases. Precise localization requires high spatiotemporal recording from populations of neurons while minimizing invasiveness and adverse events. We describe a large-scale, high-density, organic material-based, conformable neural interface device ("NeuroGrid") capable of simultaneously recording local field potentials (LFPs) and action potentials from the cortical surface...
November 2016: Science Advances
https://www.readbyqxmd.com/read/28844789/protocadherin-10-alters-%C3%AE-oscillations-amino-acid-levels-and-their-coupling-baclofen-partially-restores-these-oscillatory-deficits
#10
Russell G Port, Christopher Gajewski, Elizabeth Krizman, Holly C Dow, Shinji Hirano, Edward S Brodkin, Gregory C Carlson, Michael B Robinson, Timothy P L Roberts, Steven J Siegel
Approximately one in 45 children have been diagnosed with Autism Spectrum Disorder (ASD), which is characterized by social/communication impairments. Recent studies have linked a subset of familial ASD to mutations in the Protocadherin 10 (Pcdh10) gene. Additionally, Pcdh10's expression pattern, as well as its known role within protein networks, implicates the gene in ASD. Subsequently, the neurobiology of mice heterozygous for Pcdh10 (Pcdh10(+/-)) has been investigated as a proxy for ASD. Male Pcdh10(+/-) mice have demonstrated sex-specific deficits in social behavior, recapitulating the gender bias observed in ASD...
August 24, 2017: Neurobiology of Disease
https://www.readbyqxmd.com/read/28841860/usefulness-of-intraoperative-insular-electrocorticography-in-modified-functional-hemispherectomy
#11
Gun-Ha Kim, Joo Hee Seo, James E Baumgartner, Fatima Ajmal, Ki Hyeong Lee
BACKGROUND: The insular cortex is not routinely removed in modified functional hemispherectomy due to the risk of injury to the main arteries and to deep structures. Our study evaluates the safety and usefulness of applying intraoperative electrocorticography (ECoG) on the insular during the hemispherectomy. METHODS: We included all patients who underwent insular ECoG during a modified functional hemispherectomy from 2012 to 2015. After the surgery, the decision for further resection of the insular cortex was made based on the presence of electrographic seizures on ECoG...
August 25, 2017: BMC Neurology
https://www.readbyqxmd.com/read/28839071/intonational-speech-prosody-encoding-in-the-human-auditory-cortex
#12
C Tang, L S Hamilton, E F Chang
Speakers of all human languages regularly use intonational pitch to convey linguistic meaning, such as to emphasize a particular word. Listeners extract pitch movements from speech and evaluate the shape of intonation contours independent of each speaker's pitch range. We used high-density electrocorticography to record neural population activity directly from the brain surface while participants listened to sentences that varied in intonational pitch contour, phonetic content, and speaker. Cortical activity at single electrodes over the human superior temporal gyrus selectively represented intonation contours...
August 25, 2017: Science
https://www.readbyqxmd.com/read/28798359/portable-wireless-electrocorticography-system-with-a-flexible-microelectrodes-array-for-epilepsy-treatment
#13
Kejun Xie, Shaomin Zhang, Shurong Dong, Shijian Li, Chaonan Yu, Kedi Xu, Wanke Chen, Wei Guo, Jikui Luo, Zhaohui Wu
In this paper, we present a portable wireless electrocorticography (ECoG) system. It uses a high resolution 32-channel flexible ECoG electrodes array to collect electrical signals of brain activities and to stimulate the lesions. Electronic circuits are designed for signal acquisition, processing and transmission using Bluetooth Low Energy 4 (LTE4) for wireless communication with cell phone. In-vivo experiments on a rat show that the flexible ECoG system can accurately record electrical signals of brain activities and transmit them to cell phone with a maximal sampling rate of 30 ksampling/s per channel...
August 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28777720/delay-differential-analysis-of-seizures-in-multichannel-electrocorticography-data
#14
Claudia Lainscsek, Jonathan Weyhenmeyer, Sydney S Cash, Terrence J Sejnowski
High-density electrocorticogram (ECoG) electrodes are capable of recording neurophysiological data with high temporal resolution with wide spatial coverage. These recordings are a window to understanding how the human brain processes information and subsequently behaves in healthy and pathologic states. Here, we describe and implement delay differential analysis (DDA) for the characterization of ECoG data obtained from human patients with intractable epilepsy. DDA is a time-domain analysis framework based on embedding theory in nonlinear dynamics that reveals the nonlinear invariant properties of an unknown dynamical system...
August 4, 2017: Neural Computation
https://www.readbyqxmd.com/read/28772197/effects-of-acute-physical-exercise-in-the-light-phase-of-sleep-in-rats-with-temporal-lobe-epilepsy
#15
Cristiano de Lima, Ricardo Mario Arida, Monica Levy Andersen, Daniel Ninello Polesel, Tathiana Aparecida Fernandes de Alvarenga, Rodrigo Luiz Vancini, Gabriela Matos, Sergio Tufik
OBJECTIVE: Our aim was to investigate the influence of an acute exercise session on sleep pattern in rats with temporal lobe epilepsy (TLE). METHODS: Twenty male Wistar rats were randomly assigned to 4 groups: control (C); acute exercise (EX); epilepsy (E) and epilepsy acute exercise (EEX). Two sleep electrocorticography recordings were performed during the light phase [baseline and day 2 (after the acute physical exercise session)]. After baseline recording, the exercise groups (EX and EEX) were submitted to an exercise session on a motor-driven treadmill at 12m/min for 30min...
July 21, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28769747/movement-related-sensorimotor-high-gamma-activity-mainly-represents-somatosensory-feedback
#16
Seokyun Ryun, June S Kim, Eunjeong Jeon, Chun K Chung
Somatosensation plays pivotal roles in the everyday motor control of humans. During active movement, there exists a prominent high-gamma (HG >50 Hz) power increase in the primary somatosensory cortex (S1), and this provides an important feature in relation to the decoding of movement in a brain-machine interface (BMI). However, one concern of BMI researchers is the inflation of the decoding performance due to the activation of somatosensory feedback, which is not elicited in patients who have lost their sensorimotor function...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28750775/breakdown-of-long-range-temporal-correlations-in-brain-oscillations-during-general-anesthesia
#17
Dominik Krzemiński, Maciej Kamiński, Artur Marchewka, Michał Bola
Consciousness has been hypothesized to emerge from complex neuronal dynamics, which prevails when brain operates in a critical state. Evidence supporting this hypothesis comes mainly from studies investigating neuronal activity on a short time-scale of seconds. However, a key aspect of criticality is presence of scale-free temporal dependencies occurring across a wide range of time-scales. Indeed, robust long-range temporal correlations (LRTCs) are found in neuronal oscillations during conscious states, but it is not known how LRTCs are affected by loss of consciousness...
July 24, 2017: NeuroImage
https://www.readbyqxmd.com/read/28749594/seizure-activity-per-se-does-not-induce-tissue-damage-markers-in-human-neocortical-focal-epilepsy
#18
Laura Rossini, Rita Garbelli, Vadym Gnatkovsky, Giuseppe Didato, Flavio Villani, Roberto Spreafico, Francesco Deleo, Giorgio Lo Russo, Giovanni Tringali, Francesca Gozzo, Laura Tassi, Marco de Curtis
OBJECTIVE: The contribution of recurring seizures to the progression of epileptogenesis is debated. Seizure-induced brain damage is not conclusively demonstrated either in humans or in animal models of epilepsy. We evaluated the expression of brain injury biomarkers on postsurgical brain tissue obtained from 20 patients with frequent seizures and a long history of drug-resistant focal epilepsy. METHODS: The expression patterns of specific glial, neuronal, and inflammatory molecules were evaluated by immunohistochemistry in the core of type II focal cortical dysplasias (FCD-II), at the FCD boundary (perilesion), and in the adjacent normal-appearing area included in the epileptogenic region...
September 2017: Annals of Neurology
https://www.readbyqxmd.com/read/28716965/neural-tuning-to-low-level-features-of-speech-throughout-the-perisylvian-cortex
#19
Julia Berezutskaya, Zachary V Freudenburg, Umut Güçlü, Marcel A J van Gerven, Nick F Ramsey
Despite a large body of research, we continue to lack a detailed account of how auditory processing of continuous speech unfolds in the human brain. Previous research showed the propagation of low-level acoustic features of speech from posterior superior temporal gyrus toward anterior superior temporal gyrus in the human brain (Hullett et al., 2016). In this study, we investigate what happens to these neural representations past the superior temporal gyrus and how they engage higher-level language processing areas such as inferior frontal gyrus...
August 16, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28690513/feature-selection-methods-for-zero-shot-learning-of-neural-activity
#20
Carlos A Caceres, Matthew J Roos, Kyle M Rupp, Griffin Milsap, Nathan E Crone, Michael E Wolmetz, Christopher R Ratto
Dimensionality poses a serious challenge when making predictions from human neuroimaging data. Across imaging modalities, large pools of potential neural features (e.g., responses from particular voxels, electrodes, and temporal windows) have to be related to typically limited sets of stimuli and samples. In recent years, zero-shot prediction models have been introduced for mapping between neural signals and semantic attributes, which allows for classification of stimulus classes not explicitly included in the training set...
2017: Frontiers in Neuroinformatics
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