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Functional electroencephalography

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https://www.readbyqxmd.com/read/27922231/evaluation-of-central-nervous-system-in-patients-with-glycogen-storage-disease-type-1a
#1
Yusuf Aydemir, Figen Gürakan, İnci Nur Saltık Temizel, Hülya Demir, Kader Karlı Oğuz, Dilek Yalnızoğlu, Meral Topçu, Hasan Özen, Aysel Yüce
We aimed to evaluate structure and functions of central nervous system (CNS) in children with glycogen storage disease (GSD) type 1a. Neurological examination, psychometric tests, electroencephalography (EEG), magnetic resonance imaging (MRI), visual evoked potentials (VEP) and brainstem auditory evoked potentials (BAEP) were performed. The results were compared between patients with good and poor metabolic control and healthy children. Twenty-three patients with GSD type 1a were studied. Twelve patients were in poor metabolic control group and 11 patients in good metabolic control group...
2016: Turkish Journal of Pediatrics
https://www.readbyqxmd.com/read/27911366/a-multimodal-imaging-and-stimulation-based-method-of-evaluating-connectivity-related-brain-excitability-in-patients-with-epilepsy
#2
Mouhsin M Shafi, Susan Whitfield-Gabrieli, Catherine J Chu, Alvaro Pascual-Leone, Bernard S Chang
Resting-state functional connectivity MRI (rs-fcMRI) is a technique that identifies connectivity between different brain regions based on correlations over time in the blood-oxygenation level dependent signal. rs-fcMRI has been applied extensively to identify abnormalities in brain connectivity in different neurologic and psychiatric diseases. However, the relationship among rs-fcMRI connectivity abnormalities, brain electrophysiology and disease state is unknown, in part because the causal significance of alterations in functional connectivity in disease pathophysiology has not been established...
November 13, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27908011/principal-dynamic-mode-analysis-of-neural-mass-model-for-the-identification-of-epileptic-states
#3
Yuzhen Cao, Liu Jin, Fei Su, Jiang Wang, Bin Deng
The detection of epileptic seizures in Electroencephalography (EEG) signals is significant for the diagnosis and treatment of epilepsy. In this paper, in order to obtain characteristics of various epileptiform EEGs that may differentiate different states of epilepsy, the concept of Principal Dynamic Modes (PDMs) was incorporated to an autoregressive model framework. First, the neural mass model was used to simulate the required intracerebral EEG signals of various epileptiform activities. Then, the PDMs estimated from the nonlinear autoregressive Volterra models, as well as the corresponding Associated Nonlinear Functions (ANFs), were used for the modeling of epileptic EEGs...
November 2016: Chaos
https://www.readbyqxmd.com/read/27907960/multimodality-monitoring-illuminating-the-comatose-human-brain
#4
Charles L Francoeur, Margaret Pain, Stephan A Mayer
The field of neurocritical care has evolved tremendously in recent years, a development explained vastly by the advent of neurophysiological monitoring. From basic intracranial pressure measurements to brain tissue oxygenation, microdialysis, cerebral blood flow (CBF), and surface and intracortical electroencephalography (EEG), our ability to detect and control physiologic endpoints of brain function in comatose patients has grown substantially. The integration of these data gave birth to the concept of multimodality monitoring (MMM)...
December 2016: Seminars in Neurology
https://www.readbyqxmd.com/read/27902738/induced-and-evoked-human-electrophysiological-correlates-of-visual-working-memory-set-size-effects-at-encoding
#5
Gennadiy Gurariy, Kyle W Killebrew, Marian E Berryhill, Gideon P Caplovitz
The ability to encode, store, and retrieve visually presented objects is referred to as visual working memory (VWM). Although crucial for many cognitive processes, previous research reveals that VWM strictly capacity limited. This capacity limitation is behaviorally observable in the set size effect: the ability to successfully report items in VWM asymptotes at a small number of items. Research into the neural correlates of set size effects and VWM capacity limits in general largely focus on the maintenance period of VWM...
2016: PloS One
https://www.readbyqxmd.com/read/27898690/isoflurane-exposure-induces-cell-death-microglial-activation-and-modifies-the-expression-of-genes-supporting-neurodevelopment-and-cognitive-function-in-the-male-newborn-piglet-brain
#6
Kevin D Broad, Jane Hassell, Bobbi Fleiss, Go Kawano, Mojgan Ezzati, Eridan Rocha-Ferreira, Mariya Hristova, Kate Bennett, Igor Fierens, Ryan Burnett, Badr Chaban, Daniel Alonso-Alconada, Aaron Oliver-Taylor, Ilias Tachsidis, Jamshid Rostami, Pierre Gressens, Robert D Sanders, Nicola J Robertson
Exposure of the brain to general anesthesia during early infancy may adversely affect its neural and cognitive development. The mechanisms mediating this are complex, incompletely understood and may be sexually dimorphic, but include developmentally inappropriate apoptosis, inflammation and a disruption to cognitively salient gene expression. We investigated the effects of a 6h isoflurane exposure on cell death, microglial activation and gene expression in the male neonatal piglet brain. Piglets (n = 6) were randomised to: (i) naive controls or (ii) 6h isoflurane...
2016: PloS One
https://www.readbyqxmd.com/read/27891417/a-commonly-missed-well-known-entity-acute-intermittent-porphyria-a-case-report
#7
Smilu Mohanlal, Radha Gulati Ghildiyal, Alpana Kondekar, Poonam Wade, Richa Sinha
Acute Intermittent Porphyria (AIP) usually presents with abdominal pain, peripheral neuropathy and psychiatric manifestations. Incidence of AIP being 5 in 1,00,000. We present a case of an 11-year-old male child with multiple cranial nerve involvement, quadriparesis, focal convulsions, hypertension, hyponatremia with history of recurrent abdominal pain. His complete haemogram, ultrasonography (USG) abdomen, renal function tests were normal, he was also evaluated for tuberculosis which was negative. On further evaluation Electroencephalography (EEG) was suggestive of a generalised seizure disorder, MRI Brain suggestive of Posterior Reversible Encephalopathy Syndrome (PRES), Electromyography revealed a sensory motor axonal polyneuropathy and urine UV fluoresence test was positive for porphobilinogen which clinched the diagnosis of AIP...
October 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/27891256/scale-dependent-signal-identification-in-low-dimensional-subspace-motor-imagery-task-classification
#8
Qingshan She, Haitao Gan, Yuliang Ma, Zhizeng Luo, Tom Potter, Yingchun Zhang
Motor imagery electroencephalography (EEG) has been successfully used in locomotor rehabilitation programs. While the noise-assisted multivariate empirical mode decomposition (NA-MEMD) algorithm has been utilized to extract task-specific frequency bands from all channels in the same scale as the intrinsic mode functions (IMFs), identifying and extracting the specific IMFs that contain significant information remain difficult. In this paper, a novel method has been developed to identify the information-bearing components in a low-dimensional subspace without prior knowledge...
2016: Neural Plasticity
https://www.readbyqxmd.com/read/27885946/epilepsy-surgery-in-patients-with-autism
#9
Malgosia A Kokoszka, Patricia E McGoldrick, Maite La Vega-Talbott, Hillary Raynes, Christina A Palmese, Steven M Wolf, Cynthia L Harden, Saadi Ghatan
OBJECTIVE The purpose of this study was to report outcomes of epilepsy surgery in 56 consecutive patients with autism spectrum disorder. METHODS Medical records of 56 consecutive patients with autism who underwent epilepsy surgery were reviewed with regard to clinical characteristics, surgical management, postoperative seizure control, and behavioral changes. RESULTS Of the 56 patients with autism, 39 were male, 45 were severely autistic, 27 had a history of clinically significant levels of aggression and other disruptive behaviors, and 30 were considered nonverbal at baseline...
November 25, 2016: Journal of Neurosurgery. Pediatrics
https://www.readbyqxmd.com/read/27884662/integrity-of-central-nervous-function-in-diabetes-mellitus-assessed-by-resting-state-eeg-frequency-analysis-and-source-localization
#10
Jens B Frøkjær, Carina Graversen, Christina Brock, Ahmad Khodayari-Rostamabad, Søren S Olesen, Tine M Hansen, Eirik Søfteland, Magnus Simrén, Asbjørn M Drewes
Diabetes mellitus (DM) is associated with structural and functional changes of the central nervous system. We used electroencephalography (EEG) to assess resting state cortical activity and explored associations to relevant clinical features. Multichannel resting state EEG was recorded in 27 healthy controls and 24 patients with longstanding DM and signs of autonomic dysfunction. The power distribution based on wavelet analysis was summarized into frequency bands with corresponding topographic mapping. Source localization analysis was applied to explore the electrical cortical sources underlying the EEG...
November 6, 2016: Journal of Diabetes and its Complications
https://www.readbyqxmd.com/read/27867832/a-neuroimaging-point-of-view-on-the-diversity-of-social-cognition-evidence-for-extended-influence-of-experience-and-emotion-related-factors-on-face-processing
#11
REVIEW
Nathalie George
Faces are key social stimuli that convey a wealth of information essential for person perception and adaptive interpersonal behaviour. Studies in the domain of cognitive, affective, and social neuroscience have put in light that the processing of faces recruits specific visual regions and activates a distributed set of brain regions related to attentional, emotional, social, and memory processes associated with the perception of faces and the extraction of the numerous information attached to them. Studies using neuroimaging techniques such as functional magnetic resonance imaging (fMRI) have allowed localizing these brain regions and characterizing their functional properties...
2016: Culture and Brain
https://www.readbyqxmd.com/read/27867700/mental-stress-assessment-using-simultaneous-measurement-of-eeg-and-fnirs
#12
Fares Al-Shargie, Masashi Kiguchi, Nasreen Badruddin, Sarat C Dass, Ahmad Fadzil Mohammad Hani, Tong Boon Tang
Previous studies reported mental stress as one of the major contributing factors leading to various diseases such as heart attack, depression and stroke. An accurate stress assessment method may thus be of importance to clinical intervention and disease prevention. We propose a joint independent component analysis (jICA) based approach to fuse simultaneous measurement of electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS) on the prefrontal cortex (PFC) as a means of stress assessment...
October 1, 2016: Biomedical Optics Express
https://www.readbyqxmd.com/read/27866039/sleep-eeg-maps-the-functional-neuroanatomy-of-executive-processes-in-adolescents-born-very-preterm
#13
Flavia M Wehrle, Beatrice Latal, Ruth L O'Gorman, Cornelia F Hagmann, Reto Huber
Executive function deficits are among the most frequent sequela of very preterm birth but the underlying neuronal mechanisms are not fully understood. We used high-density electroencephalography (EEG) recordings during sleep to assess alterations in the functional neuroanatomy of executive processes in adolescents born very preterm. The topographical distribution of sleep slow wave activity (SWA; 1-4.5 Hz EEG power) has previously been used to map cognitive abilities and is known to reflect the intensity of the prior use of the respective neuronal networks...
October 28, 2016: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/27859029/reactivation-of-seizure-related-changes-to-interictal-spike-shape-and-synchrony-during-postseizure-sleep-in-patients
#14
Mark R Bower, Michal T Kucewicz, Erik K St Louis, Fredric B Meyer, W Richard Marsh, Matt Stead, Gregory A Worrell
OBJECTIVE: Local field potentials (LFPs) arise from synchronous activation of millions of neurons, producing seemingly consistent waveform shapes and relative synchrony across electrodes. Interictal spikes (IISs) are LFPs associated with epilepsy that are commonly used to guide surgical resection. Recently, changes in neuronal firing patterns observed in the minutes preceding seizure onset were found to be reactivated during postseizure sleep, a process called seizure-related consolidation (SRC), due to similarities with learning-related consolidation...
November 18, 2016: Epilepsia
https://www.readbyqxmd.com/read/27845929/electroencephalography-eeg-forward-modeling-via-h-div-finite-element-sources-with-focal-interpolation
#15
S Pursiainen, J Vorwerk, C H Wolters
The goal of this study is to develop focal, accurate and robust finite element method (FEM) based approaches which can predict the electric potential on the surface of the computational domain given its structure and internal primary source current distribution. While conducting an EEG evaluation, the placement of source currents to the geometrically complex grey matter compartment is a challenging but necessary task to avoid forward errors attributable to tissue conductivity jumps. Here, this task is approached via a mathematically rigorous formulation, in which the current field is modeled via divergence conforming H(div) basis functions...
December 21, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27844062/memorable-audiovisual-narratives-synchronize-sensory-and-supramodal-neural-responses
#16
Samantha S Cohen, Lucas C Parra
Our brains integrate information across sensory modalities to generate perceptual experiences and form memories. However, it is difficult to determine the conditions under which multisensory stimulation will benefit or hinder the retrieval of everyday experiences. We hypothesized that the determining factor is the reliability of information processing during stimulus presentation, which can be measured through intersubject correlation of stimulus-evoked activity. We therefore presented biographical auditory narratives and visual animations to 72 human subjects visually, auditorily, or combined, while neural activity was recorded using electroencephalography...
November 2016: ENeuro
https://www.readbyqxmd.com/read/27825901/kinesthetic-motor-imagery-training-modulates-frontal-midline-theta-during-imagination-of-a-dart-throw
#17
E Weber, M Doppelmayr
Motor imagery (MI) is a frequently used and effective method for motor learning in sports as well as in other domains. Electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) studies indicated that experts within a certain sport exhibit a more pronounced brain activity during MI as compared to novices. Similar to the execution, during MI the motor sequence has to be planned. Thus, the frontal attentional system, in part represented by the frontal midline theta (4-7Hz), is closely related to these processes and presumably plays a major role in MI as well...
November 5, 2016: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/27815729/mu-rhythm-suppression-is-associated-with-the-classification-of-emotion-in-faces
#18
Matthew R Moore, Elizabeth A Franz
The mirror neuron system (MNS) has been mooted as a crucial component underlying human social cognition. Initial evidence based on functional magnetic resonance imaging (fMRI) suggests that the MNS plays a role in emotion classification, but further confirmation and convergent evidence is needed. This study employed electroencephalography (EEG) to examine modulations in the mu rhythm associated with the inference of emotions from facial expressions. It was hypothesised that mu suppression would be associated with classifying the emotion portrayed by facial expressions...
November 4, 2016: Cognitive, Affective & Behavioral Neuroscience
https://www.readbyqxmd.com/read/27815577/reduced-mind-wandering-in-experienced-meditators-and-associated-eeg-correlates
#19
Tracy Brandmeyer, Arnaud Delorme
One outstanding question in the contemplative science literature relates to the direct impact of meditation experience on the monitoring of internal states and its respective correspondence with neural activity. In particular, to what extent does meditation influence the awareness, duration and frequency of the tendency of the mind to wander. To assess the relation between mind wandering and meditation, we tested 2 groups of meditators, one with a moderate level of experience (non-expert) and those who are well advanced in their practice (expert)...
November 4, 2016: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
https://www.readbyqxmd.com/read/27814760/clinical-predictors-of-seizure-recurrence-after-the-first-post-ischemic-stroke-seizure
#20
Hyeon Jin Kim, Kee Duk Park, Kyoung-Gyu Choi, Hyang Woon Lee
BACKGROUND: The number of patients suffering post-stroke seizure after ischemic stroke (PSSi) is quite considerable, especially because ischemic stroke is more prevalent than hemorrhage in the general population. This study aimed to determine the predicting factors for seizure recurrence in ischemic stroke survivors and develop a clinical scoring system for the prediction of risks for seizure recurrence after the first PSSi. METHODS: We reviewed 3792 ischemic stroke patients from the Ewha Stroke Registry...
November 5, 2016: BMC Neurology
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