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Electrocorticography

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https://www.readbyqxmd.com/read/28424599/electrophysiological-sequelae-of-hemispherotomy-in-ipsilateral-human-cortex
#1
Ammar H Hawasli, Ravi Chacko, Nicholas P Szrama, David T Bundy, Mrinal Pahwa, Chester K Yarbrough, Brian J Dlouhy, David D Limbrick, Dennis L Barbour, Matthew D Smyth, Eric C Leuthardt
Objectives: Hemispheric disconnection has been used as a treatment of medically refractory epilepsy and evolved from anatomic hemispherectomy to functional hemispherectomies to hemispherotomies. The hemispherotomy procedure involves disconnection of an entire hemisphere with limited tissue resection and is reserved for medically-refractory epilepsy due to diffuse hemispheric disease. Although it is thought to be effective by preventing seizures from spreading to the contralateral hemisphere, the electrophysiological effects of a hemispherotomy on the ipsilateral hemisphere remain poorly defined...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28411273/low-frequency-cortical-oscillations-entrain-to-sub-threshold-rhythmic-auditory-stimuli
#2
Sanne Ten Oever, Charles E Schroeder, David Poeppel, Nienke van Atteveldt, Ashesh D Mehta, Pierre Mégevand, David M Groppe, Elana Zion-Golumbic
Many environmental stimuli contain temporal regularities, a feature which can help predict forthcoming input. Phase-locking (entrainment) of ongoing low-frequency neuronal oscillations to rhythmic stimuli is proposed as a potential mechanism for enhancing neuronal responses and perceptual sensitivity, by aligning high-excitability phases to events within a stimulus stream. Previous experiments show that rhythmic structure has a behavioral benefit even when the rhythm itself is below perceptual detection thresholds (Ten Oever et al...
April 14, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28411268/attention-to-multiple-objects-facilitates-their-integration-in-prefrontal-and-parietal-cortex
#3
Yee-Joon Kim, Jeffrey J Tsai, Jeffrey Ojemann, Preeti Verghese
Selective attention is known to interact with perceptual organization. In visual scenes, individual objects that are distinct and discriminable may occur on their own, or in groups such as a stack of books. The main objective of this study is to probe the neural interaction that occurs between individual objects when attention is directed towards one or more objects. Here we record steady-state visual evoked potentials via electrocorticography (ECoG) to directly assess the responses to individual stimuli and to their interaction...
April 14, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28409730/chronic-multisite-brain-recordings-from-a-totally-implantable-bidirectional-neural-interface-experience-in-5-patients-with-parkinson-s-disease
#4
Nicole C Swann, Coralie de Hemptinne, Svjetlana Miocinovic, Salman Qasim, Jill L Ostrem, Nicholas B Galifianakis, Marta San Luciano, Sarah S Wang, Nathan Ziman, Robin Taylor, Philip A Starr
OBJECTIVE Dysfunction of distributed neural networks underlies many brain disorders. The development of neuromodulation therapies depends on a better understanding of these networks. Invasive human brain recordings have a favorable temporal and spatial resolution for the analysis of network phenomena but have generally been limited to acute intraoperative recording or short-term recording through temporarily externalized leads. Here, the authors describe their initial experience with an investigational, first-generation, totally implantable, bidirectional neural interface that allows both continuous therapeutic stimulation and recording of field potentials at multiple sites in a neural network...
April 14, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28396294/chronic-ambulatory-electrocorticography-from-human-speech-cortex
#5
Vikram R Rao, Matthew K Leonard, Jonathan K Kleen, Ben A Lucas, Emily A Mirro, Edward F Chang
Direct intracranial recording of human brain activity is an important approach for deciphering neural mechanisms of cognition. Such recordings, usually made in patients with epilepsy undergoing inpatient monitoring for seizure localization, are limited in duration and depend on patients' tolerance for the challenges associated with recovering from brain surgery. Thus, typical intracranial recordings, similar to most non-invasive approaches in humans, provide snapshots of brain activity in acute, highly constrained settings, limiting opportunities to understand long timescale and natural, real-world phenomena...
April 7, 2017: NeuroImage
https://www.readbyqxmd.com/read/28389384/correspondence-between-fmri-and-electrophysiology-during-visual-motion-processing-in-human-mt
#6
Anna Gaglianese, Mariska J Vansteensel, Ben M Harvey, Serge O Dumoulin, Natalia Petridou, Nick F Ramsey
Changes in brain neuronal activity are reflected by hemodynamic responses mapped through Blood Oxygenation Level Dependent (BOLD) functional magnetic resonance imaging (fMRI), a primary tool to measure brain functioning non-invasively. However, the exact relationship between hemodynamics and neuronal function is still a matter of debate. Here, we combine 3T BOLD fMRI and High Frequency Band (HFB) electrocorticography (ECoG) signals to investigate the relationship between neuronal activity and hemodynamic responses in the human Middle Temporal complex (hMT+), a higher order brain area involved in visual motion processing...
April 4, 2017: NeuroImage
https://www.readbyqxmd.com/read/28387627/surgery-guided-with-intraoperative-electrocorticography-in-patients-with-low-grade-glioma-and-refractory-seizures
#7
Pei-Sen Yao, Shu-Fa Zheng, Feng Wang, De-Zhi Kang, Yuan-Xiang Lin
OBJECTIVE Using intraoperative electrocorticography (ECoG) to identify epileptogenic areas and improve postoperative seizure control in patients with low-grade gliomas (LGGs) remains inconclusive. In this study the authors retrospectively report on a surgery strategy that is based on intraoperative ECoG monitoring. METHODS A total of 108 patients with LGGs presenting at the onset of refractory seizures were included. Patients were divided into 2 groups. In Group I, all patients underwent gross-total resection (GTR) combined with resection of epilepsy areas guided by intraoperative ECoG, while patients in Group II underwent only GTR...
April 7, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/28380659/tailoring-epilepsy-surgery-with-fast-ripples-in-the-intra-operative-electrocorticogram
#8
M A van 't Klooster, N E C van Klink, W J E M Zweiphenning, F S S Leijten, R Zelmann, C H Ferrier, P C van Rijen, W M Otte, K P J Braun, G J M Huiskamp, M Zijlmans
OBJECTIVE: Intra-operative electrocorticography (ECoG) can be used to delineate the resection area in epilepsy surgery. High frequency oscillations (HFOs, 80-500Hz) seem better biomarkers for epileptogenic tissue than spikes. We studied how HFOs and spikes in combined pre- and post-resection ECoG predict surgical outcome in different tailoring approaches. METHODS: We, retrospectively, marked HFOs, divided into fast ripples (FRs, 250-500Hz) and ripples (80-250Hz), and spikes in pre- and post-resection ECoG sampled at 2048 Hz in people with refractory focal epilepsy...
April 5, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/28375161/implications-for-a-wireless-external-device-system-to-study-electrocorticography
#9
David Rotermund, Jonas Pistor, Janpeter Hoeffmann, Tim Schellenberg, Dmitriy Boll, Elena Tolstosheeva, Dieter Gauck, Heiko Stemmann, Dagmar Peters-Drolshagen, Andreas Kurt Kreiter, Martin Schneider, Steffen Paul, Walter Lang, Klaus Richard Pawelzik
Implantable neuronal interfaces to the brain are an important keystone for future medical applications. However, entering this field of research is difficult since such an implant requires components from many different areas of technology. Since the complete avoidance of wires is important due to the risk of infections and other long-term problems, means for wirelessly transmitting data and energy are a necessity which adds to the requirements. In recent literature, many high-tech components for such implants are presented with remarkable properties...
April 4, 2017: Sensors
https://www.readbyqxmd.com/read/28371785/ultrahigh-density-256-channel-neural-sensing-microsystem-using-tsv-embedded-neural-probes
#10
Yu-Chieh Huang, Po-Tsang Huang, Shang-Lin Wu, Yu-Chen Hu, Yan-Huei You, Jr-Ming Chen, Yan-Yu Huang, Hsiao-Chun Chang, Yen-Han Lin, Jeng-Ren Duann, Tzai-Wen Chiu, Wei Hwang, Kuan-Neng Chen, Ching-Te Chuang, Jin-Chern Chiou
Highly integrated neural sensing microsystems are crucial to capture accurate signals for brain function investigations. In this paper, a 256-channel neural sensing microsystem with a sensing area of 5 × 5 mm2 is presented based on 2.5-D through-silicon-via (TSV) integration. This microsystem composes of dissolvable μ-needles, TSV-embedded μ-probes, 256-channel neural amplifiers, 11-bit area-power-efficient successive approximation register analog-to-digital converters, and serializers. This microsystem can detect 256 electrocorticography and local field potential signals within a small area of 5 mm × 5 mm...
March 30, 2017: IEEE Transactions on Biomedical Circuits and Systems
https://www.readbyqxmd.com/read/28361947/mapping-ecog-channel-contributions-to-trajectory-and-muscle-activity-prediction-in-human-sensorimotor-cortex
#11
Yasuhiko Nakanishi, Takufumi Yanagisawa, Duk Shin, Hiroyuki Kambara, Natsue Yoshimura, Masataka Tanaka, Ryohei Fukuma, Haruhiko Kishima, Masayuki Hirata, Yasuharu Koike
Studies on brain-machine interface techniques have shown that electrocorticography (ECoG) is an effective modality for predicting limb trajectories and muscle activity in humans. Motor control studies have also identified distributions of "extrinsic-like" and "intrinsic-like" neurons in the premotor (PM) and primary motor (M1) cortices. Here, we investigated whether trajectories and muscle activity predicted from ECoG were obtained based on signals derived from extrinsic-like or intrinsic-like neurons. Three participants carried objects of three different masses along the same counterclockwise path on a table...
March 31, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28357637/acute-resective-surgery-for-the-treatment-of-refractory-status-epilepticus
#12
Maysaa Merhi Basha, Kushak Suchdev, Monica Dhakar, William J Kupsky, Sandeep Mittal, Aashit K Shah
BACKGROUND: To identify the role of acute surgical intervention in the treatment of refractory status epilepticus (RSE). METHODS: Retrospective review of consecutive patients who underwent epilepsy surgery from 2006 to 2015 was done to identify cases where acute surgical intervention was employed for the treatment of RSE. In addition, the adult and pediatric RSE literature was reviewed for reports of surgical treatment of RSE. RESULTS: Nine patients, aged 20-68 years, with various etiologies were identified to have undergone acute surgical resection for the treatment of RSE, aided by electrocorticography...
March 29, 2017: Neurocritical Care
https://www.readbyqxmd.com/read/28350195/standard-sampling-microdialysis-and-spreading-depolarizations-in-patients-with-malignant-hemispheric-stroke
#13
Alexandra Pinczolits, Anna Zdunczyk, Nora F Dengler, Nils Hecht, Christina M Kowoll, Christian Dohmen, Rudolf Graf, Maren Kl Winkler, Sebastian Major, Jed A Hartings, Jens P Dreier, Peter Vajkoczy, Johannes Woitzik
Spreading depolarizations (SD) occur in high frequency in patients with malignant hemispheric stroke (MHS). Experimentally, SDs cause marked increases in glutamate and lactate, whereas glucose decreases. Here, we studied extracellular brain glutamate, glucose, lactate, pyruvate and the lactate/pyruvate ratio in relationship to SDs after MHS. We inserted two microdialysis probes in peri-infarct tissue at 5 and 15 mm to the infarct in close proximity to a subdural electrode strip. During 2356.6 monitoring hours, electrocorticography (ECoG) revealed 697 SDs in 16 of 18 patients...
January 1, 2017: Journal of Cerebral Blood Flow and Metabolism
https://www.readbyqxmd.com/read/28348967/preventive-effect-of-coriandrum-sativum-on-neuronal-damages-in-pentylentetrazole-induced-seizure-in-rats
#14
Mojtaba Pourzaki, Mansour Homayoun, Saeed Sadeghi, Masoumeh Seghatoleslam, Mahmoud Hosseini, Alireza Ebrahimzadeh Bideskan
OBJECTIVE: Coriandrum sativum (C. sativum) as a medicinal plant has been pointed to have analgesic, hypnotic and anti-oxidant effects. In the current study, a possible preventive effect of the hydro-alcoholic extract of the plant on neuronal damages was examined in pentylenetetrazole (PTZ) rat model of seizure. MATERIALS AND METHODS: Forty male rats were divided into five main groups and treated by (1) saline, (2) PTZ: 100 mg/kg PTZ (i.p) and (3-5) 50, 100 and 200 mg/kg of hydro-alcoholic extract of C...
March 2017: Avicenna Journal of Phytomedicine
https://www.readbyqxmd.com/read/28334963/three-and-four-dimensional-mapping-of-speech-and-language-in-patients-with-epilepsy
#15
Yasuo Nakai, Jeong-Won Jeong, Erik C Brown, Robert Rothermel, Katsuaki Kojima, Toshimune Kambara, Aashit Shah, Sandeep Mittal, Sandeep Sood, Eishi Asano
We have provided 3-D and 4D mapping of speech and language function based upon the results of direct cortical stimulation and event-related modulation of electrocorticography signals. Patients estimated to have right-hemispheric language dominance were excluded. Thus, 100 patients who underwent two-stage epilepsy surgery with chronic electrocorticography recording were studied. An older group consisted of 84 patients at least 10 years of age (7367 artefact-free non-epileptic electrodes), whereas a younger group included 16 children younger than age 10 (1438 electrodes)...
March 16, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28325009/a-clinic-compatible-open-source-electrophysiology-system
#16
John Hermiz, Nick Rogers, Erik Kaestner, Mehran Ganji, Dan Cleary, Joseph Snider, David Barba, Shadi Dayeh, Eric Halgren, Vikash Gilja
Open source electrophysiology (ephys) recording systems have several advantages over commercial systems such as customization and affordability enabling more researchers to conduct ephys experiments. Notable open source ephys systems include Open-Ephys, NeuroRighter and more recently Willow, all of which have high channel count (64+), scalability, and advanced software to develop on top of. However, little work has been done to build an open source ephys system that is clinic compatible, particularly in the operating room where acute human electrocorticography (ECoG) research is performed...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28322026/objective-3d-surface-evaluation-of-intracranial-electrophysiologic-correlates-of-cerebral-glucose-metabolic-abnormalities-in-children-with-focal-epilepsy
#17
Jeong-Won Jeong, Eishi Asano, Vinod Kumar Pilli, Yasuo Nakai, Harry T Chugani, Csaba Juhász
To determine the spatial relationship between 2-deoxy-2[(18) F]fluoro-D-glucose (FDG) metabolic and intracranial electrophysiological abnormalities in children undergoing two-stage epilepsy surgery, statistical parametric mapping (SPM) was used to correlate hypo- and hypermetabolic cortical regions with ictal and interictal electrocorticography (ECoG) changes mapped onto the brain surface. Preoperative FDG-PET scans of 37 children with intractable epilepsy (31 with non-localizing MRI) were compared with age-matched pseudo-normal pediatric control PET data...
March 21, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28319187/the-impact-of-high-grade-glial-neoplasms-on-human-cortical-electrophysiology
#18
S Kathleen Bandt, Jarod L Roland, Mrinal Pahwa, Carl D Hacker, David T Bundy, Jonathan D Breshears, Mohit Sharma, Joshua S Shimony, Eric C Leuthardt
OBJECTIVE: The brain's functional architecture of interconnected network-related oscillatory patterns in discrete cortical regions has been well established with functional magnetic resonance imaging (fMRI) studies or direct cortical electrophysiology from electrodes placed on the surface of the brain, or electrocorticography (ECoG). These resting state networks exhibit a robust functional architecture that persists through all stages of sleep and under anesthesia. While the stability of these networks provides a fundamental understanding of the organization of the brain, understanding how these regions can be perturbed is also critical in defining the brain's ability to adapt while learning and recovering from injury...
2017: PloS One
https://www.readbyqxmd.com/read/28306691/predictive-value-of-electrocorticography-in-patients-with-mesial-temporal-lobe-epilepsy-undergoing-selective-amygdalohippocampectomy
#19
Aline Herlopian, Bashir Shihabuddin
PURPOSE: The utility of intraoperative electrocorticography has been reported in predicting seizure outcome in patients with mesial temporal lobe epilepsy due to mesial temporal sclerosis (MTS) undergoing standard temporal lobectomy. Three studies reported the predictive outcome in patients with MTS undergoing selective amygdalohippocampectomy (sAHE). We evaluate the predictive value of the intraoperative electrocorticography in postoperative outcome in patients with mesial temporal lobe epilepsy secondary to MTS undergoing sAHE...
March 16, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28269735/polysilicon-based-flexible-temperature-sensor-for-high-spatial-resolution-brain-temperature-monitoring
#20
Zhizhen Wu, Chunyan Li, Jed Hartings, Raj K Narayan, Chong Ahn
In this paper, we present a flexible temperature sensor with ultra-small polysilicon thermistors for brain temperature monitoring. In vitro sensitivity, resolution, thermal hysteresis and long term stability tests were performed. Temperature coefficient of resistance (TCR) of -0.0031/ °C and resolution of 0.1 °C were obtained for the sensor. Thermal hysteresis for temperature range of 30~45 °C was less than 0.1 °C. With silicon nitride as the passivation layer, the temperature sensor showed a drift within 0...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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