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https://www.readbyqxmd.com/read/28632737/supervised-filters-for-eeg-signal-in-naturally-occurring-epilepsy-forecasting
#1
Francisco Javier Muñoz-Almaraz, Francisco Zamora-Martínez, Paloma Botella-Rocamora, Juan Pardo
Nearly 1% of the global population has Epilepsy. Forecasting epileptic seizures with an acceptable confidence level, could improve the disease treatment and thus the lifestyle of the people who suffer it. To do that the electroencephalogram (EEG) signal is usually studied through spectral power band filtering, but this paper proposes an alternative novel method of preprocessing the EEG signal based on supervised filters. Such filters have been employed in a machine learning algorithm, such as the K-Nearest Neighbor (KNN), to improve the prediction of seizures...
2017: PloS One
https://www.readbyqxmd.com/read/28627505/monitoring-alert-and-drowsy-states-by-modeling-eeg-source-nonstationarity
#2
Sheng-Hsiou Hsu, Tzyy-Ping Jung
As a human brain performs various cognitive functions within ever-changing environments, states of the brain characterized by recorded brain activities such as electroencephalogram (EEG) are inevitably nonstationary. The challenges of analyzing the nonstationary EEG signals include finding neurocognitive sources that underlie different brain states and using EEG data to quantitatively assess the state changes. Approach. This study hypothesizes that brain activities under different states, e.g. levels of alertness, can be modeled as distinct compositions of statistically independent sources using independent component analysis (ICA)...
June 19, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28627083/a-review-of-important-eeg-features-for-the-assessment-of-brain-maturation-in-premature-infants
#3
REVIEW
Elena Pavlidis, Rhodri O Lloyd, Sean Mathieson, Geraldine B Boylan
This review describes the maturational features of the baseline electroencephalogram (EEG) in the neurologically healthy preterm infant. Features such as continuity, sleep state, synchrony and transient waveforms are described, even from extremely preterm infants and includes abundant illustrated examples. The physiological significance of these EEG features and their relationship to neurodevelopment is highlighted where known. This review also demonstrates the importance of multichannel conventional EEG monitoring for preterm infants as many of the features described are not apparent if limited channel EEG monitors are used...
June 18, 2017: Acta Paediatrica
https://www.readbyqxmd.com/read/28626393/a-ssvep-stimuli-encoding-method-using-trinary-frequency-shift-keying-encoded-ssvep-tfsk-ssvep
#4
Xing Zhao, Dechun Zhao, Xia Wang, Xiaorong Hou
SSVEP is a kind of BCI technology with advantage of high information transfer rate. However, due to its nature, frequencies could be used as stimuli are scarce. To solve such problem, a stimuli encoding method which encodes SSVEP signal using Frequency Shift-Keying (FSK) method is developed. In this method, each stimulus is controlled by a FSK signal which contains three different frequencies that represent "Bit 0," "Bit 1" and "Bit 2" respectively. Different to common BFSK in digital communication, "Bit 0" and "Bit 1" composited the unique identifier of stimuli in binary bit stream form, while "Bit 2" indicates the ending of a stimuli encoding...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28626013/sleep-disrupts-high-level-speech-parsing-despite-significant-basic-auditory-processing
#5
Shiri Makov, Omer Sharon, Nai Ding, Michal Ben-Shachar, Yuval Nir, Elana Zion Golumbic
The extent to which the sleeping brain processes sensory information remains unclear. This is particularly true for continuous and complex stimuli, such as speech, in which information is organized into hierarchically embedded structures. Recently, novel metrics for assessing the neural representation of continuous speech have been developed, using non-invasive brain recordings. Those were so far tested during wakefulness. Here we investigated, for the first time, the sleeping brain's capacity to process continuous speech at different hierarchical levels, using a newly developed Concurrent Hierarchical Tracking (CHT) approach that can online monitor the neural representation and processing-depth of continuous speech...
June 16, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28623753/precuneal-epilepsy-clinical-features-and-surgical-outcome
#6
Adil Harroud, Olivier Boucher, Thi Phuoc Yen Tran, Louis Harris, Jeffery Hall, François Dubeau, Ismail Mohamed, Alain Bouthillier, Dang Khoa Nguyen
OBJECTIVE: The precuneus is a complex and highly connected structure located in the medial portion of the superior parietal lobule. The clinical presentation of precuneal epilepsy is poorly characterized, mostly because these patients have seldom been distinguished from those with other types of parietal lobe epilepsy. The present study aims to improve the understanding of precuneal epilepsy by detailing its clinical features and surgical outcomes. METHODS: Six previously unreported cases of drug-resistant precuneal epilepsy investigated between 2002 and 2014 were retrospectively studied...
June 14, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28622545/diagnosing-psychogenic-nonepileptic-seizures-video-eeg-monitoring-suggestive-seizure-induction-and-diagnostic-certainty
#7
Stoyan Popkirov, Johannes Jungilligens, Wenke Grönheit, Jörg Wellmer
Psychogenic nonepileptic seizures (PNES) can remain undiagnosed for many years, leading to unnecessary medication and delayed treatment. A recent report by the International League Against Epilepsy Nonepileptic Seizures Task Force recommends a staged approach to the diagnosis of PNES (LaFrance, et al., 2013). We aimed to investigate its practical utility, and to apply the proposed classification to evaluate the role of long-term video-EEG monitoring (VEEG) and suggestive seizure induction (SSI) in PNES workup...
June 13, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28622529/automatic-multimodal-detection-for-long-term-seizure-documentation-in-epilepsy
#8
F Fürbass, S Kampusch, E Kaniusas, J Koren, S Pirker, R Hopfengärtner, H Stefan, T Kluge, C Baumgartner
OBJECTIVE: This study investigated sensitivity and false detection rate of a multimodal automatic seizure detection algorithm and the applicability to reduced electrode montages for long-term seizure documentation in epilepsy patients. METHODS: An automatic seizure detection algorithm based on EEG, EMG, and ECG signals was developed. EEG/ECG recordings of 92 patients from two epilepsy monitoring units including 494 seizures were used to assess detection performance...
May 25, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28622355/anesthetic-action-on-the-transmission-delay-between-cortex-and-thalamus-explains-the-beta-buzz-observed-under-propofol-anesthesia
#9
Meysam Hashemi, Axel Hutt, Darren Hight, Jamie Sleigh
In recent years, more and more surgeries under general anesthesia have been performed with the assistance of electroencephalogram (EEG) monitors. An increase in anesthetic concentration leads to characteristic changes in the power spectra of the EEG. Although tracking the anesthetic-induced changes in EEG rhythms can be employed to estimate the depth of anesthesia, their precise underlying mechanisms are still unknown. A prominent feature in the EEG of some patients is the emergence of a strong power peak in the β-frequency band, which moves to the α-frequency band while increasing the anesthetic concentration...
2017: PloS One
https://www.readbyqxmd.com/read/28618377/ring-and-peg-electrodes-for-minimally-invasive-and-long-term-sub-scalp-eeg-recordings
#10
Y B Benovitski, A Lai, C C McGowan, O Burns, V Maxim, D A X Nayagam, R Millard, G D Rathbone, M A le Chevoir, R A Williams, D B Grayden, C N May, M Murphy, W J D'Souza, M J Cook, C E Williams
OBJECTIVE: Minimally-invasive approaches are needed for long-term reliable Electroencephalography (EEG) recordings to assist with epilepsy diagnosis, investigation and more naturalistic monitoring. This study compared three methods for long-term implantation of sub-scalp EEG electrodes. METHODS: Three types of electrodes (disk, ring, and peg) were fabricated from biocompatible materials and implanted under the scalp in five ambulatory ewes for 3months. Disk electrodes were inserted into sub-pericranial pockets...
June 12, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28614746/ictal-coughing-clinical-features-and-differential-diagnoses
#11
Ali A Asadi-Pooya, Leah Shabo, Dale Wyeth, Maromi Nei
PURPOSE: To describe a series of patients with ictal coughing to estimate its occurrence and characterize the clinical features and differential diagnoses. METHODS: We retrospectively reviewed all the long-term video-EEG reports from Jefferson Comprehensive Epilepsy Center over a 7-year period (2010-2016) for the occurrence of the term "cough" in the text body. All the extracted reports were reviewed and patients with at least one documented ictal coughing at the epilepsy monitoring unit (EMU) were included in the study...
June 11, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28612538/-risk-factors-and-prognosis-of-secondary-epilepsy-in-children-with-viral-encephalitis
#12
Liang Huang, Dan Yu, Rong Luo, Min Li, Hui Zhou, Xiao-Tang Cai, Zhi-Ling Wang
OBJECTIVES: To investigate the clinical features of viral encephalitis in children at acute stage, and the relationship of these clinical features with post viral encephalitic epilepsy. METHODS: The children with viral encephalitis treated in West China Second University Hospital between January 2010 and January 2014 were enrolled. The clinical features included general conditions, clinical manifestations, video electroencephalogram (VEEG), neuroimaging, virology, prognosis and antiepileptic drugs...
March 2017: Sichuan da Xue Xue Bao. Yi Xue Ban, Journal of Sichuan University. Medical Science Edition
https://www.readbyqxmd.com/read/28586707/consensus-based-guidelines-for-video-eeg-monitoring-in-the-pre-surgical-evaluation-of-children-with-epilepsy-in-the-uk
#13
Ronit M Pressler, Stefano Seri, Nick Kane, Tim Martland, Sushma Goyal, Anand Iyer, Elliott Warren, Lesley Notghi, Peter Bill, Rachel Thornton, Richard Appleton, Sarah Doyle, Sarah Rushton, Alan Worley, Stewart G Boyd
PURPOSE: Paediatric Epilepsy surgery in the UK has recently been centralised in order to improve expertise and quality of service available to children. Video EEG monitoring or telemetry is a highly specialised and a crucial component of the pre-surgical evaluation. Although many Epilepsy Monitoring Units work to certain standards, there is no national or international guideline for paediatric video telemetry. METHODS: Due to lack of evidence we used a modified Delphi process utilizing the clinical and academic expertise of the clinical neurophysiology sub-specialty group of Children's Epilepsy Surgical Service (CESS) centres in England and Wales...
May 12, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/28586706/lgi1-antibody-encephalitis-is-characterised-by-frequent-multifocal-clinical-and-subclinical-seizures
#14
Sidra Aurangzeb, Mkael Symmonds, Ravi K Knight, Robin Kennett, Tim Wehner, Sarosh R Irani
PURPOSE: To describe clinical and electrographic characteristics of seizures LGI1-antibody encephalitis, and their correlations with two-year outcomes. METHODS: Video-electroencephalography recordings were performed on a cohort of 16 consecutive patients with LGI1-antibodies from two UK neuroscience-centers over five-years. RESULTS: From 14 of 16 patients (13 males; age-range 53-92years), 86 faciobrachial dystonic seizures were recorded at a median frequency of 0...
May 30, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/28586508/overexpressing-wild-type-%C3%AE-2-subunits-rescued-the-seizure-phenotype-in-gabrg2-q390x-dravet-syndrome-mice
#15
Xuan Huang, Chengwen Zhou, Mengnan Tian, Jing-Qiong Kang, Wangzhen Shen, Kelienne Verdier, Aurea Pimenta, Robert L MacDonald
OBJECTIVE: The mutant γ-aminobutyric acid type A (GABAA ) receptor γ2(Q390X) subunit (Q351X in the mature peptide) has been associated with the epileptic encephalopathy, Dravet syndrome, and the epilepsy syndrome genetic epilepsy with febrile seizures plus (GEFS+). The mutation generates a premature stop codon that results in translation of a stable truncated and misfolded γ2 subunit that accumulates in neurons, forms intracellular aggregates, disrupts incorporation of γ2 subunits into GABAA receptors, and affects trafficking of partnering α and β subunits...
June 6, 2017: Epilepsia
https://www.readbyqxmd.com/read/28584915/understanding-lennox-gastaut-syndrome-insights-from-focal-epilepsy-patients-with-lennox-gastaut-features
#16
Sophie Dupont, Raluca Banica-Wolters, Isabelle An-Gourfinkel, Virginie Lambrecq, Vincent Navarro, Claude Adam, Vi-Huong Nguyen-Michel
To delineate the clinical and EEG features of adults with focal epilepsy associated with a generalized paroxysmal fast activity (GPFA) pattern on EEG who developed refractory seizures, notably drop attacks, but do not fulfill the classical triad for the diagnosis of Lennox-Gastaut syndrome (LGS) and provide further insight into LGS mechanisms. Among 957 patients admitted to video-EEG monitoring between 2002 and 2015, we retrospectively research adult patients with refractory focal epilepsy, drop attacks and GPFA on EEG...
June 5, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28584707/rituals-decrease-the-neural-response-to-performance-failure
#17
Nicholas M Hobson, Devin Bonk, Michael Inzlicht
Rituals are found in all types of performance domains, from high-stakes athletics and military to the daily morning preparations of the working family. Yet despite their ubiquity and widespread importance for humans, we know very little of ritual's causal basis and how (if at all) they facilitate goal-directed performance. Here, in a fully pre-registered pre/post experimental design, we examine a candidate proximal mechanism, the error-related negativity (ERN), in testing the prediction that ritual modulates neural performance-monitoring...
2017: PeerJ
https://www.readbyqxmd.com/read/28580292/non-invasive-multimodal-analysis-of-cortical-activity-blood-volume-and-neurovascular-coupling-in-infantile-spasms-using-eeg-fnirs-monitoring
#18
Emilie Bourel-Ponchel, Mahdi Mahmoudzadeh, Aline Delignières, Patrick Berquin, Fabrice Wallois
Although infantile spasms can be caused by a variety of etiologies, the clinical features are stereotypical. The neuronal and vascular mechanisms that contribute to the emergence of infantile spasms are not well understood. We performed a multimodal study by simultaneously recording electroencephalogram and functional Near-infrared spectroscopy in an intentionally heterogeneous population of six children with spasms in clusters. Regardless of the etiology, spasms were accompanied by two phases of hemodynamic changes; an initial change in the cerebral blood volume (simultaneously with each spasm) followed by a neurovascular coupling in all children except for the one with a large porencephalic cyst...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28578510/trans-falcine-and-contralateral-sub-frontal-electrode-placement-in-pediatric-epilepsy-surgery-technical-note
#19
Jonathan Pindrik, Nguyen Hoang, R Shane Tubbs, Brandon J Rocque, Curtis J Rozzelle
INTRODUCTION: Phase II monitoring with intracranial electroencephalography (ICEEG) occasionally requires bilateral placement of subdural (SD) strips, grids, and/or depth electrodes. While phase I monitoring often demonstrates a preponderance of unilateral findings, individual studies (video EEG, single photon emission computed tomography [SPECT], and positron emission tomography [PET]) can suggest or fail to exclude a contralateral epileptogenic onset zone. This study describes previously unreported techniques of trans-falcine and sub-frontal insertion of contralateral SD grids and depth electrodes for phase II monitoring in pediatric epilepsy surgery patients when concern about bilateral abnormalities has been elicited during phase I monitoring...
June 3, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/28576433/postictal-apnea-as-an-important-mechanism-for-sudep-a-near-sudep-with-continuous-eeg-ecg-emg-recording
#20
Lang Jin, Ying Zhang, Xiao-Li Wang, Wen-Juan Zhang, Yong-Hong Liu, Zhao Jiang
Sudden unexpected death in epilepsy (SUDEP) is one of the most frequent causes of death among patients with epilepsy. Most SUDEP or near-SUDEP are unwitnessed and not observed or recorded during video-EEG recording in epilepsy monitoring units. This report describes a young woman with post ictal apnea and generalized EEG suppression (PGES) after a secondary generalized tonic-clonic seizure (sGTCS). This was accompanied by bradycardia and then ventricular tachycardia (VT). But at the end of VT, the patient's breath recovered without any intervention, such as cardio-respiratory resuscitation...
May 30, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
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