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Electrocorticography

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https://www.readbyqxmd.com/read/28798359/portable-wireless-electrocorticography-system-with-a-flexible-microelectrodes-array-for-epilepsy-treatment
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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 contribute of recurring seizures to the progression of epileptogenesis is debated. Seizure-induced brain damage is not conclusively demonstrated both in humans and in animal models of epilepsy. We evaluated the expression of brain injury biomarkers on post-surgical 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 was 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...
July 27, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/28716965/neural-tuning-to-low-level-features-of-speech-throughout-the-perisylvian-cortex
#7
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 towards 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...
July 17, 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
#8
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
https://www.readbyqxmd.com/read/28685662/simultaneous-functional-photoacoustic-microscopy-and-electrocorticography-reveal-the-impact-of-rtpa-on-dynamic-neurovascular-functions-after-cerebral-ischemia
#9
Aishwarya Bandla, Lun-De Liao, Su Jing Chan, Ji Min Ling, Yu-Hang Liu, Yen-Yu Ian Shih, Han-Chi Pan, Peter Tsun-Hon Wong, Hsin-Yi Lai, Nicolas Kon Kam King, You-Yin Chen, Wai Hoe Ng, Nitish V Thakor
The advance of thrombolytic therapy has been hampered by the lack of optimization of the therapy during the hyperacute phase of focal ischemia. Here, we investigate neurovascular dynamics using a custom-designed hybrid electrocorticography (ECoG)-functional photoacoustic microscopy (fPAM) imaging system during the hyperacute phase (first 6 h) of photothrombotic ischemia (PTI) in male Wistar rats following recombinant tissue plasminogen activator (rtPA)-mediated thrombolysis. We reported, for the first time, the changes in neural activity and cerebral hemodynamic responses following rtPA infusion at different time points post PTI...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28681208/surgical-considerations-in-the-optimal-management-of-patients-with-malignant-brain-tumors
#10
REVIEW
Jaclyn J Renfrow, Roy E Strowd, Adrian W Laxton, Stephen B Tatter, Carol P Geer, Glenn J Lesser
Advances in technology are revolutionizing medicine and the limits of what we can offer to our patients. In neurosurgery, technology continues to reduce morbidity, increase surgical accuracy, facilitate tissue acquisition, and promote novel techniques for prolonging survival in patients with neuro-oncologic disease. Surgery has been the backbone of glioma diagnosis and treatment by providing adequate, high quality material for precise histologic diagnosis, and genomic characterization in the setting of significant intratumoral heterogeneity, thus allowing personalized treatment selection in the clinic...
August 2017: Current Treatment Options in Oncology
https://www.readbyqxmd.com/read/28676308/using-electrocorticography-for-presurgical-language-mapping-in-epilepsy-patients
#11
Jianbin Wen, Tao Yu, Yongjie Li, Xiaoli Li
Of five epilepsy patients with implanted subdural electrodes, electrical cortical stimulation (ECS) on left posterior inferior frontal gyri (LPIFG) of dominant language hemisphere, did not elicit language production related symptoms. These patients were then subjected to six language production tasks with simultaneously electrocorticographic (ECoG) recording. Dada analysis revealed several cortical sites showed event-related cortical high gamma activities. These sites were linked to certain functions, e.g., auditory, visual, and sensorimotor, according to their different activation patterns among tasks...
July 1, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28676297/inferring-synaptic-excitation-inhibition-balance-from-field-potentials
#12
Richard Gao, Erik J Peterson, Bradley Voytek
Neural circuits sit in a dynamic balance between excitation (E) and inhibition (I). Fluctuations in E:I balance have been shown to influence neural computation, working memory, and information flow, while more drastic shifts and aberrant E:I patterns are implicated in numerous neurological and psychiatric disorders. Current methods for measuring E:I dynamics require invasive procedures that are difficult to perform in behaving animals, and nearly impossible in humans. This has limited the ability to examine the full impact that E:I shifts have in cognition and disease...
July 1, 2017: NeuroImage
https://www.readbyqxmd.com/read/28651628/separability-of-motor-imagery-of-the-self-from-interpretation-of-motor-intentions-of-others-at-the-single-trial-level-an-eeg-study
#13
João Andrade, José Cecílio, Marco Simões, Francisco Sales, Miguel Castelo-Branco
BACKGROUND: We aimed to investigate the separability of the neural correlates of 2 types of motor imagery, self and third person (actions owned by the participant himself vs. another individual). If possible this would allow for the development of BCI interfaces to train disorders of action and intention understanding beyond simple imitation, such as autism. METHODS: We used EEG recordings from 20 healthy participants, as well as electrocorticography (ECoG) in one, based on a virtual reality setup...
June 26, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28644979/intraoperative-fast-ripples-independently-predict-postsurgical-epilepsy-outcome-comparison-with-other-electrocorticographic-phenomena
#14
Shaun A Hussain, Gary W Mathern, Phoebe Hung, Julius Weng, Raman Sankar, Joyce Y Wu
In the surgical management of epilepsy, the resection of cortex exhibiting interictal fast ripples (250-500Hz) on electrocorticography has been linked to postoperative seizure-freedom. Although fast ripples appear to accurately identify the epileptogenic zone-the minimum tissue that must be removed at surgery to achieve seizure-freedom-it has not been established that fast ripples are a superior biomarker in comparison with multimodal presurgical neuroimaging and other electrocorticography abnormalities. Hence, in the prediction of postoperative seizure-freedom, we compared the value of fast ripples with other intraoperative electocorticography abnormalities including focal slowing, paroxysmal fast activity, intermittent spike discharges, continuous epileptiform discharges, focal attenuation, and intraoperative seizures, as well as complete resection of the lesion defined by MRI and other neuroimaging...
June 16, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28618390/thirty-day-non-seizure-outcomes-following-temporal-lobectomy-for-adult-epilepsy
#15
Brandon A Sherrod, Matthew C Davis, Kristen O Riley
OBJECTIVE: Multi-institutional rates of acute adverse outcomes other than seizures after temporal lobectomy (TL) are not well understood. Here we analyzed short-term morbidity and mortality following TL using a validated national database. PATIENTS AND METHODS: The multi-institutional American College of Surgeons National Surgical Quality Improvement Program (NSQIP) database was queried by Current Procedural Terminology (CPT) code for TL procedures performed for adult patients with diagnoses related to epilepsy from 2008 to 2014...
September 2017: Clinical Neurology and Neurosurgery
https://www.readbyqxmd.com/read/28617218/multi-scale-visual-analysis-of-time-varying-electrocorticography-data-via-clustering-of-brain-regions
#16
Sugeerth Murugesan, Kristofer Bouchard, Edward Chang, Max Dougherty, Bernd Hamann, Gunther H Weber
BACKGROUND: There exists a need for effective and easy-to-use software tools supporting the analysis of complex Electrocorticography (ECoG) data. Understanding how epileptic seizures develop or identifying diagnostic indicators for neurological diseases require the in-depth analysis of neural activity data from ECoG. Such data is multi-scale and is of high spatio-temporal resolution. Comprehensive analysis of this data should be supported by interactive visual analysis methods that allow a scientist to understand functional patterns at varying levels of granularity and comprehend its time-varying behavior...
June 6, 2017: BMC Bioinformatics
https://www.readbyqxmd.com/read/28615329/physiological-properties-of-brain-machine-interface-input-signals
#17
REVIEW
Marc W Slutzky, Robert D Flint
Brain-machine interfaces (BMIs), also called brain-computer interfaces (BCIs), decode neural signals and use them to control some type of external device. Despite many experimental successes and terrific demonstrations in animals and humans, a high-performance, clinically viable device has not yet been developed for widespread usage. There are many factors that impact clinical viability and BMI performance. Arguably, the first of these is the selection of brain signals used to control BMIs. In this review, we summarize the physiological characteristics and performance-including movement-related information, longevity, and stability-of multiple types of input signals that have been used in invasive BMIs to date...
August 1, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28597847/mapping-the-fine-structure-of-cortical-activity-with-different-micro-ecog-electrode-array-geometries
#18
Xi Wang, C Alexis Gkogkidis, Olga Iljina, Lukas D J Fiederer, Christian Henle, Irina Mader, Jan Kaminsky, Thomas Stieglitz, Mortimer Gierthmuehlen, Tonio Ball
OBJECTIVE: Innovations in micro-electrocorticography (µECoG) electrode array manufacturing now allow for intricate designs with smaller contact diameters and/or pitch (i.e. inter-contact distance) down to the sub-mm range. The aims of the present study were: (i) to investigate whether frequency ranges up to 400 Hz can be reproducibly observed in µECoG recordings and (ii) to examine how differences in topographical substructure between these frequency bands and electrode array geometries can be quantified...
June 9, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28584127/dynamic-changes-in-murine-forebrain-mir-211-expression-associate-with-cholinergic-imbalances-and-epileptiform-activity
#19
Uriya Bekenstein, Nibha Mishra, Dan Z Milikovsky, Geula Hanin, Daniel Zelig, Liron Sheintuch, Amit Berson, David S Greenberg, Alon Friedman, Hermona Soreq
Epilepsy is a common neurological disease, manifested in unprovoked recurrent seizures. Epileptogenesis may develop due to genetic or pharmacological origins or following injury, but it remains unclear how the unaffected brain escapes this susceptibility to seizures. Here, we report that dynamic changes in forebrain microRNA (miR)-211 in the mouse brain shift the threshold for spontaneous and pharmacologically induced seizures alongside changes in the cholinergic pathway genes, implicating this miR in the avoidance of seizures...
June 20, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28577913/anticonvulsant-activity-of-resveratrol-loaded-liposomes-in-vivo
#20
M S Ethemoglu, F B Seker, H Akkaya, E Kilic, I Aslan, C S Erdogan, B Yilmaz
Resveratrol (3,5,4'-stilbenetriol), a natural polyphenol produced by various plants, has attracted attention over the past decade because of its multiple beneficial properties, including anti-inflammatory, anti-oxidant and chemopreventive, yet, there is limited information about its antiepileptic effects. Moreover, its poor solubility in water and low bioavailability are the challenging issues. In the present study, we aimed to investigate effects of free resveratrol and resveratrol delivered in amphipathic liposomal delivery system, which has a high blood-brain barrier crossing potential, on penicillin-induced epileptic seizure model...
June 1, 2017: Neuroscience
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