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Quantitative eeg

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https://www.readbyqxmd.com/read/28732342/scope-mtl-a-non-invasive-tool-for-identifying-and-lateralizing-mesial-temporal-lobe-seizures-prior-to-scalp-eeg-ictal-onset
#1
Alice D Lam, Douglas Maus, Sahar F Zafar, Andrew J Cole, Sydney S Cash
OBJECTIVE: In mesial temporal lobe (mTL) epilepsy, seizure onset can precede the appearance of a scalp EEG ictal pattern by many seconds. The ability to identify this early, occult mTL seizure activity could improve lateralization and localization of mTL seizures on scalp EEG. METHODS: Using scalp EEG spectral features and machine learning approaches on a dataset of combined scalp EEG and foramen ovale electrode recordings in patients with mTL epilepsy, we developed an algorithm, SCOPE-mTL, to detect and lateralize early, occult mTL seizure activity, prior to the appearance of a scalp EEG ictal pattern...
July 1, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28729833/altered-neuronal-activity-topography-markers-in-the-elderly-with-increased-atherosclerosis
#2
Takashi Shibata, Toshimitu Musha, Yukio Kosugi, Michiya Kubo, Yukio Horie, Naoya Kuwayama, Satoshi Kuroda, Karin Hayashi, Yohei Kobayashi, Mieko Tanaka, Haruyasu Matsuzaki, Kiyotaka Nemoto, Takashi Asada
Background: Previously, we reported on vascular cognitive impairment (VCI) templates, consisting of patients with VCI associated with carotid stenosis (>60%) using a quantitative electroencephalographic (EEG) technique called neuronal activity topography (NAT). Here using the VCI templates, we investigated the hypothesis that internal carotid artery-intima-media thickness (ICA-IMT) is associated with EEG spectrum intensity (sNAT) and spectrum steepness (vNAT). Methods: A total of 221 community-dwelling elderly subjects were recruited...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28721936/assessing-quantitative-eeg-spectrograms-to-identify-non-epileptic-events
#3
Ajay Goenka, Alexis Boro, Elissa Yozawitz
To evaluate the sensitivity and specificity of quantitative EEG (QEEG) spectrograms in order to distinguish epileptic from non-epileptic events. Seventeen patients with paroxysmal non-epileptic events, captured during EEG monitoring, were retrospectively assessed using QEEG spectrograms. These patients were compared to a control group of 13 consecutive patients (ages 25-60 years) with epileptic seizures of similar semiology. Assessment of raw EEG was employed as the gold standard against which epileptic and non-epileptic events were validated...
July 19, 2017: Epileptic Disorders: International Epilepsy Journal with Videotape
https://www.readbyqxmd.com/read/28713043/auditory-discrimination-improvement-predicts-awakening-of-postanoxic-comatose-patients-treated-with-targeted-temperature-management-at-36%C3%A2-c
#4
Christian Pfeiffer, Nathalie Ata Nguepno Nguissi, Magali Chytiris, Phanie Bidlingmeyer, Matthias Haenggi, Rebekka Kurmann, Frédéric Zubler, Mauro Oddo, Andrea O Rossetti, Marzia De Lucia
BACKGROUND: Outcome prognostication in postanoxic comatose patients is more accurate in predicting poor than good recovery. Using electroencephalography recordings in patients treated with targeted temperature management at 33°C (TTM 33), we have previously shown that improvement in auditory discrimination over the first days of coma predicted awakening. Given the increased application of a 36°C temperature target (TTM 36), here we aimed at validating the predictive value of auditory discrimination in the TTM 36 setting...
July 13, 2017: Resuscitation
https://www.readbyqxmd.com/read/28699778/neurofeedback-as-an-adjunct-therapy-for-treatment-of-chronic-post-traumatic-stress-disorder-related-to-refugee-trauma-and-torture-experiences-two-case-studies
#5
Mirjana Askovic, Anna J Watters, Jorge Aroche, Anthony W F Harris
OBJECTIVE: The objective of this study was to describe the use of neurofeedback for refugee-related chronic post-traumatic stress disorder (PTSD) in two case studies. METHODS: We describe the assessment and application of neurofeedback integrated into the treatment of two clients with chronic PTSD. We include details of our treatment schedule, symptoms and quantitative electrophysiological data for each case. Results All clients achieved significant reduction in symptoms of PTSD and improvement in daily functioning post-neurofeedback therapy...
July 1, 2017: Australasian Psychiatry: Bulletin of Royal Australian and New Zealand College of Psychiatrists
https://www.readbyqxmd.com/read/28690583/correlating-interictal-spikes-with-sigma-and-delta-dynamics-during-non-rapid-eye-movement-sleep
#6
Frédéric Zubler, Annalisa Rubino, Giorgio Lo Russo, Kaspar Schindler, Lino Nobili
Interictal spikes (IS) are one of the major hallmarks of epilepsy. Understanding the factors promoting or suppressing IS would increase our comprehension of epilepsy and possibly open new avenues for therapy. Sleep strongly influences epileptic activity, and the modulatory effects of the different sleep stages on IS have been studied for decades. However, several aspects are still disputed, in particular the role of sleep spindles and slow waves in the activation of IS during Non-REM sleep. Here, we correlate the rate of IS with quantitative measures derived from stereo-EEG during one Non-REM cycle in 10 patients suffering from drug-resistant epilepsy due to type 2 focal cortical dysplasia...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28677591/a-realistic-multimodal-modeling-approach-for-the-evaluation-of-distributed-source-analysis-application-to-sloreta
#7
Delphine Cosandier-Rimélé, Georgia Ramantani, Josef Zentner, Andreas Schulze-Bonhage, Matthias Duempelmann
OBJECTIVE: Electrical Source Localization (ESL) deriving from scalp EEG and, in recent years, from intracranial EEG (iEEG), is an established method in epilepsy surgery workup. We aimed to validate the distributed ESL derived from scalp EEG and iEEG, particularly regarding the spatial extent of the source, using a realistic epileptic spike activity simulator. APPROACH: ESL was applied to the averaged scalp EEG and iEEG spikes of two patients with drug-resistant structural epilepsy...
July 5, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28663069/meditation-is-associated-with-increased-brain-network-integration
#8
Remko van Lutterveld, Edwin van Dellen, Prasanta Pal, Hua Yang, Cornelis Jan Stam, Judson Brewer
INTRODUCTION: This study aims to identify novel quantitative EEG measures associated with mindfulness meditation. As there is some evidence that meditation is associated with higher integration of brain networks, we focused on EEG measures of network integration. METHODS: Sixteen novice meditators and sixteen experienced meditators participated in the study. Novice meditators performed a basic meditation practice that supported effortless awareness, which is an important quality of experience related to mindfulness practices, while their EEG was recorded...
June 27, 2017: NeuroImage
https://www.readbyqxmd.com/read/28654635/two-different-mechanisms-support-selective-attention-at-different-phases-of-training
#9
Sirawaj Itthipuripat, Kexin Cha, Anna Byers, John T Serences
Selective attention supports the prioritized processing of relevant sensory information to facilitate goal-directed behavior. Studies in human subjects demonstrate that attentional gain of cortical responses can sufficiently account for attention-related improvements in behavior. On the other hand, studies using highly trained nonhuman primates suggest that reductions in neural noise can better explain attentional facilitation of behavior. Given the importance of selective information processing in nearly all domains of cognition, we sought to reconcile these competing accounts by testing the hypothesis that extensive behavioral training alters the neural mechanisms that support selective attention...
June 2017: PLoS Biology
https://www.readbyqxmd.com/read/28648714/evaluation-of-a-minimum-norm-based-beamforming-technique-sloreta-for-reducing-tonic-muscle-contamination-of-eeg-at-sensor-level
#10
Azin S Janani, Tyler S Grummett, Trent W Lewis, Sean P Fitzgibbon, Emma M Whitham, Dylan DelosAngeles, Hanieh Bakhshayesh, John O Willoughby, Kenneth J Pope
BACKGROUND: Cranial and cervical muscle activity (electromyogram, EMG) contaminates the surface electroencephalogram (EEG) from frequencies below 20 through to frequencies above 100Hz. It is not possible to have a reliable measure of cognitive tasks expressed in EEG at gamma-band frequencies until the muscle contamination is removed. NEW METHOD: In the present work, we introduce a new approach of using a minimum-norm based beamforming technique (sLORETA) to reduce tonic muscle contamination at sensor level...
June 23, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28646267/quantitative-eeg-metrics-differ-between-outcome-groups-and-change-over-the-first-72%C3%A2-h-in-comatose-cardiac-arrest-patients
#11
Sara Leingang Wiley, Babak Razavi, Prashanth Krishnamohan, Michael Mlynash, Irina Eyngorn, Kimford J Meador, Karen G Hirsch
BACKGROUND: Forty to sixty-six percent of patients resuscitated from cardiac arrest remain comatose, and historic outcome predictors are unreliable. Quantitative spectral analysis of continuous electroencephalography (cEEG) may differ between patients with good and poor outcomes. METHODS: Consecutive patients with post-cardiac arrest hypoxic-ischemic coma undergoing cEEG were enrolled. Spectral analysis was conducted on artifact-free contiguous 5-min cEEG epochs from each hour...
June 23, 2017: Neurocritical Care
https://www.readbyqxmd.com/read/28645840/autoreject-automated-artifact-rejection-for-meg-and-eeg-data
#12
Mainak Jas, Denis A Engemann, Yousra Bekhti, Federico Raimondo, Alexandre Gramfort
We present an automated algorithm for unified rejection and repair of bad trials in magnetoencephalography (MEG) and electroencephalography (EEG) signals. Our method capitalizes on cross-validation in conjunction with a robust evaluation metric to estimate the optimal peak-to-peak threshold - a quantity commonly used for identifying bad trials in M/EEG. This approach is then extended to a more sophisticated algorithm which estimates this threshold for each sensor yielding trial-wise bad sensors. Depending on the number of bad sensors, the trial is then repaired by interpolation or by excluding it from subsequent analysis...
June 20, 2017: NeuroImage
https://www.readbyqxmd.com/read/28638591/replicable-in-vivo-physiological-and-behavioral-phenotypes-of-the-shank3b-null-mutant-mouse-model-of-autism
#13
Sameer C Dhamne, Jill L Silverman, Chloe E Super, Stephen H T Lammers, Mustafa Q Hameed, Meera E Modi, Nycole A Copping, Michael C Pride, Daniel G Smith, Alexander Rotenberg, Jacqueline N Crawley, Mustafa Sahin
BACKGROUND: Autism spectrum disorder (ASD) is a clinically and biologically heterogeneous condition characterized by social, repetitive, and sensory behavioral abnormalities. No treatments are approved for the core diagnostic symptoms of ASD. To enable the earliest stages of therapeutic discovery and development for ASD, robust and reproducible behavioral phenotypes and biological markers are essential to establish in preclinical animal models. The goal of this study was to identify electroencephalographic (EEG) and behavioral phenotypes that are replicable between independent cohorts in a mouse model of ASD...
2017: Molecular Autism
https://www.readbyqxmd.com/read/28638037/-melatonin-in-therapy-of-sleep-disorders-age-related-estrogen-deficiency
#14
I M Madaeva, I N Danusevich, R M Zhambalova, L I Kolesnikova
AIM: To assess quantitative characteristics of sleep in perimenopausal women treated with melatonin in a dose of 3 mg during 3 month. MATERIAL AND METHODS: A study included 21 perimenopausal women with sleep disorders. Seventeen women completed the study. Insomnia Severity Index (ISI), anamnestic and gynecological examinations, polysomnographic monitoring (PSM) were used. All patients received melatonin (melaxen) 30 min before going to bed in a dose of 3 mg daily during 3 month...
2017: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
https://www.readbyqxmd.com/read/28634598/previously-unrecognized-behavioral-phenotype-in-gaucher-disease-type-3
#15
Magy Abdelwahab, Michael Potegal, Elsa G Shapiro, Igor Nestrasil
OBJECTIVE: To provide a comprehensive description of abnormal behaviors in patients with Gaucher disease type 3 (GD3) and relate these behaviors to demographic, neurodevelopmental, and neurologic characteristics. METHODS: Thirty-four Egyptian patients with GD3 (mean age of 7.9 years) were enrolled in the study. They were selected based on parent report and/or physician observation of one or more abnormal behaviors documented in 2 settings and by 2 different individuals and/or by video recording...
June 2017: Neurology. Genetics
https://www.readbyqxmd.com/read/28627505/monitoring-alert-and-drowsy-states-by-modeling-eeg-source-nonstationarity
#16
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/28622651/application-of-electroencephalographic-techniques-to-the-study-of-visual-impact-of-renewable-energies
#17
M D Grima Murcia, Francisco Sánchez Ferrer, Jennifer Sorinas, J M Ferrandez, Eduardo Fernandez
Much is currently being studied on the negative visual impact associated to the installation of large wind turbines or photovoltaic farms. However, methodologies for quantitatively assessing landscape impact are scarce. In this work we used electroencephalographic (EEG) recordings to investigate the brain activity of 14 human volunteers when looking at the same landscapes with and without wind turbines, solar panels and nuclear power plants. Our results showed no significant differences for landscapes with solar power systems or without them, and the same happened for wind turbines, what was in agreement with their subjective scores...
June 13, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28602596/brain-sodium-mri-in-human-epilepsy-disturbances-of-ionic-homeostasis-reflect-the-organization-of-pathological-regions
#18
Ben Ridley, Angela Marchi, Jonathan Wirsich, Elisabeth Soulier, Sylviane Confort-Gouny, Lothar Schad, Fabrice Bartolomei, Jean-Philippe Ranjeva, Maxime Guye, Wafaa Zaaraoui
In light of technical advancements supporting exploration of MR signals other than (1)H, sodium ((23)Na) has received attention as a marker of ionic homeostasis and cell viability. Here, we evaluate for the first time the possibility that (23)Na-MRI is sensitive to pathological processes occurring in human epilepsy. A normative sample of 27 controls was used to normalize regions of interest (ROIs) from 1424 unique brain locales on quantitative (23)Na-MRI and high-resolution (1)H-MPRAGE images. ROIs were based on intracerebral electrodes in ten patients undergoing epileptic network mapping...
June 7, 2017: NeuroImage
https://www.readbyqxmd.com/read/28600921/an-exploration-of-the-spectrum-of-peri-ictal-mri-change-a-comprehensive-literature-review
#19
REVIEW
Jennifer A Williams, Peter Bede, Colin P Doherty
PURPOSE: The aim of this review was to identify published studies in the literature relating to ictal induced MRI change and to identify certain common themes, practical points for clinicians and areas for future research. METHODS: We identified 96 articles that satisfied our inclusion criteria yielding 575 cases. All articles were analysed; number of subjects, spectrum of MRI and EEG change, aetiology, and follow-up (both clinical and imaging) were noted. RESULTS: The most frequent imaging changes were restricted diffusion, T2-hyperintensity and reduced ADC values...
May 31, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/28600632/dynamic-complexity-measures-and-entropy-paths-for-modelling-and-comparison-of-evolution-of-patients-with-drug-resistant-epileptic-encephalopathy-syndromes-drees
#20
Ricardo Zavala-Yoe, Ricardo A Ramirez-Mendoza
Epileptic encephalopathies (EE) is a term coined by the International League Against Epilepsy (ILAE) to refer to a group of epilepsies in which the ictal and interictal abnormalities may contribute to progressive cerebral dysfunction. Among them, two affect mainly children and are very difficult to deal with, Doose and Lennox-Gastaut syndromes, (DS and LGS, respectively). So far (Zavala-Yoe et al., J Integr Neurosci 15(2):205-223, 2015a and works of ours there), quantitative analysis of single case studies of EE have been performed...
June 9, 2017: Metabolic Brain Disease
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