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Functional electroencephalography

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https://www.readbyqxmd.com/read/29344470/aphasic-status-epilepticus-associated-with-uremia
#1
Min-Surk Kye, Jung-Ju Lee, Byung-Kun Kim, Ohyun Kwon, Jong Moo Park, Kyusik Kang, Woong-Woo Lee
Aphasic status epilepticus (ASE) is a rare disorder characterized by recurrent aphasia without impairment of other cognitive functions. A 76-year-old woman with chronic kidney disease developed ASE after neglecting peritoneal dialysis. Magnetic resonance imaging failed to demonstrate an appropriate lesion. Electroencephalography demonstrated ictal discharges in the left frontotemporal leads. ASE disappeared after intravenous valproic acid and correction of uremia. This is the first case report of ASE in a patient with acute aggravation of uremia...
December 2017: Journal of Epilepsy Research
https://www.readbyqxmd.com/read/29343201/the-impact-of-blackcurrant-juice-on-attention-mood-and-brain-wave-spectral-activity-in-young-healthy-volunteers
#2
A W Watson, E J Okello, H J Brooker, S Lester, G J McDougall, K A Wesnes
There is a growing body of evidence from randomized controlled trials which indicates that consumption of berries has a positive effect upon the cognitive function of healthy adults. It has been recommended that studies combining cognitive and physiological measures be undertaken in order to strengthen the evidence base for the putative effects of flavonoid consumption on cognitive outcomes. This pilot study utilized a randomized, double-blind and placebo controlled crossover design to assess the influence of the acute administration of anthocyanin-rich blackcurrant juice, standardized at 500 mg of polyphenols, on mood and attention...
January 17, 2018: Nutritional Neuroscience
https://www.readbyqxmd.com/read/29342237/the-roles-of-subdivisions-of-human-insula-in-emotion-perception-and-auditory-processing
#3
Yang Zhang, Wenjing Zhou, Siyu Wang, Qin Zhou, Haixiang Wang, Bingqing Zhang, Juan Huang, Bo Hong, Xiaoqin Wang
Previous studies have shown insular activations involving sensory, motor, and affective processing. However, the functional roles of subdivisions within the human insula are still not well understood. In the present study, we used intracranial electroencephalography and electrical cortical stimulation to investigate the causal roles of subdivisions of the insula in auditory emotion perception in epilepsy patients implanted with depth electrodes in this brain region. The posterior and the anterior subdivisions of the human insula, identified based on structural and functional analyses, showed distinct response properties to auditory emotional stimuli...
January 12, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29341331/the-relationship-between-thalamic-gaba-content-and-resting-cortical-rhythm-in-neuropathic-pain
#4
Flavia Di Pietro, Paul M Macey, Caroline D Rae, Zeynab Alshelh, Vaughan G Macefield, E Russell Vickers, Luke A Henderson
Recurrent thalamocortical connections are integral to the generation of brain rhythms and it is thought that the inhibitory action of the thalamic reticular nucleus is critical in setting these rhythms. Our work and others' has suggested that chronic pain that develops following nerve injury, that is, neuropathic pain, results from altered thalamocortical rhythm, although whether this dysrhythmia is associated with thalamic inhibitory function remains unknown. In this investigation, we used electroencephalography and magnetic resonance spectroscopy to investigate cortical power and thalamic GABAergic concentration in 20 patients with neuropathic pain and 20 pain-free controls...
January 17, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29337999/a-dynamical-systems-approach-for-estimating-phase-interactions-between-rhythms-of-different-frequencies-from-experimental-data
#5
Takayuki Onojima, Takahiro Goto, Hiroaki Mizuhara, Toshio Aoyagi
Synchronization of neural oscillations as a mechanism of brain function is attracting increasing attention. Neural oscillation is a rhythmic neural activity that can be easily observed by noninvasive electroencephalography (EEG). Neural oscillations show the same frequency and cross-frequency synchronization for various cognitive and perceptual functions. However, it is unclear how this neural synchronization is achieved by a dynamical system. If neural oscillations are weakly coupled oscillators, the dynamics of neural synchronization can be described theoretically using a phase oscillator model...
January 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29336937/the-combination-of-stereo-eeg-and-radiofrequency-ablation
#6
Hélène Catenoix, Pierre Bourdillon, Marc Guénot, Jean Isnard
SEEG-guided radiofrequency thermocoagulation (SEEG-guided RFTC), a combination of Stereo-electroencephalography (SEEG) and radiofrequency thermocoagulation (RFTC), has been performed since 2001 in drug resistant epilepsy. The interest of this procedure is to aim at total or partial destruction of the epileptogenic zone, as tailored in each individual patient by the SEEG exploration. These multiple SEEG-guided RFTC lesions of epileptic foci are produced by using a radiofrequency generator connected to the electrode contacts...
January 9, 2018: Epilepsy Research
https://www.readbyqxmd.com/read/29335359/recruitment-of-additional-corticospinal-pathways-in-the-human-brain-with-state-dependent-paired-associative-stimulation
#7
Dominic Kraus, Georgios Naros, Robert Guggenberger, Maria Teresa Leão, Ulf Ziemann, Alireza Gharabaghi
Standard brain stimulation protocols modify human motor cortex excitability by modulating the gain of the activated corticospinal pathways. However, the restoration of motor function following lesions of the corticospinal tract requires also the recruitment of additional neurons to increase the net corticospinal output. For this purpose, we investigated a novel protocol based on brain state-dependent paired associative stimulation.Motor imagery (MI)-related electroencephalography was recorded in healthy males and females for brain state-dependent control of both cortical and peripheral stimulation in a brain-machine interface environment...
January 15, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29332091/the-association-among-default-mode-network-functional-connectivity-mentalization-and-psychopathology-in-a-nonclinical-sample-an-eloreta-study
#8
Benedetto Farina, Giacomo Della Marca, Giulia Maestoso, Noemi Amoroso, Enrico Maria Valenti, Giuseppe Alessio Carbone, Chiara Massullo, Anna Contardi, Claudio Imperatori
AIMS: We investigated default mode network (DMN) electroencephalography (EEG) functional connectivity differences between individuals with self-reported high mentalization capability and low psychopathological symptoms, versus participants with mentalization impairments and high psychopathological symptoms. METHODS: Forty-nine students (35 women) with a mean age of 22.92 ± 2.53 years were administered the Mentalization Questionnaire (MZQ) and the Symptom Checklist-90-Revised...
January 13, 2018: Psychopathology
https://www.readbyqxmd.com/read/29331846/functional-neuroimaging-in-rasmussen-syndrome
#9
Ichiro Kuki, Kazumi Matsuda, Yuko Kubota, Tetsuhiro Fukuyama, Yukitoshi Takahashi, Yushi Inoue, Haruo Shintaku
PURPOSE: For a diagnosis of Rasmussen syndrome (RS), clinical course together with electroencephalography (EEG) and magnetic resonance imaging (MRI) findings are considered important, but there are few reports on functional neuroimaging. This study investigated cerebral blood flow (CBF)-single photon emission computed tomography (SPECT), central benzodiazepine receptor (BZR)-SPECT, and fluorine-18 fluorodeoxy glucose-positron emission tomography (FDG-PET) in RS patients, and correlated neuroimaging results with MRI and pathological findings...
January 5, 2018: Epilepsy Research
https://www.readbyqxmd.com/read/29329819/the-effect-of-continuous-positive-airway-pressure-on-spectral-encephalogram-characteristics-in-stroke-patients-with-obstructive-sleep-apnea
#10
Hisham Alshaer, Aditya Pandya, Igor Zivanovic, Carolina Gonzaga Carvalho, Clodagh Ryan
OBJECTIVES: To evaluate if treatment with continuous positive airway pressure (CPAP) compared to usual care in stroke patients with obstructive sleep apnea (OSA) over one month reduces delta and alpha oscillations on quantitative electroencephalography (EEG) in association with improvements in cognitive or functional outcomes. METHODS: Spectral EEG analysis was performed in patients with subacute stroke and OSA randomized to usual care or CPAP treatment from a previous study...
January 9, 2018: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/29329385/reassessing-the-evidence-for-capacity-limits-in-neural-signals-related-to-working-memory
#11
Paul M Bays
In 2004, two landmark studies described the discovery of brain imaging (functional magnetic resonance imaging and electroencephalography) signals that increase with the number of items held in visual working memory (WM). These studies claimed that the signals leveled off (plateaued) once the number of memoranda reached the capacity of WM, as estimated by the prevailing model of the time. However, alternative models were not considered, and changing concepts of WM in the more than a decade since these studies were published necessitate a re-evaluation of their findings; newer models that provide the most accurate account of behavioral data do not incorporate a fixed limit on the number of items stored...
January 10, 2018: Cerebral Cortex
https://www.readbyqxmd.com/read/29329316/electroencephalography-power-and-coherence-changes-with-age-and-motor-skill-development-across-the-first-half-year-of-life
#12
Ran Xiao, Joanne Shida-Tokeshi, Douglas L Vanderbilt, Beth A Smith
Existing research in infants has correlated electroencephalography (EEG) measures of power and coherence to cognitive development and to locomotor experience, but only in infants older than 5 months of age. Our goal was to explore the relationship between EEG measures of power and coherence and motor skill development in younger infants who are developing reaching skill. Twenty-one infants with typical development between 38 and 203 days of age participated. Longitudinal EEG recording sessions were recorded in monthly increments, with 3-5 sessions acquired for 19 participants and 1 session for 2 participants, resulting in 71 sessions in total...
2018: PloS One
https://www.readbyqxmd.com/read/29328980/consequence-of-intraventricular-hemorrhage-on-neurovascular-coupling-evoked-by-speech-syllables-in-preterm-neonates
#13
Mahdi Mahmoudzadeh, Ghislaine Dehaene-Lambertz, Guy Kongolo, Marc Fournier, Sabrina Goudjil, Fabrice Wallois
Intraventricular Hemorrhage (IVH) is the leading cause of neurological and cognitive impairment in preterm neonates with an incidence that increases with increasing prematurity. In the present study, we tested how preterm neonates with IVH react to external stimulation (i.e. speech syllables). We compared their neural responses measured by electroencephalography (EEG), and hemodynamic responses measured by functional near-infrared spectroscopy (fNIRS), with those of healthy preterms. A neural response to syllables was observed in these infants, but did not induce a vascular response in contrast with healthy neonates...
January 5, 2018: Developmental Cognitive Neuroscience
https://www.readbyqxmd.com/read/29327337/generalized-nonmotor-absence-seizures-what-do-absence-generalized-and-nonmotor-mean
#14
REVIEW
Iris Unterberger, Eugen Trinka, Peter W Kaplan, Gerald Walser, Gerhard Luef, Gerhard Bauer
OBJECTIVE: Clinical absences are now classified as "generalized nonmotor (absence) seizures" by the International League Against Epilepsy (ILAE). The aim of this paper is to critically review the concept of absences and to put the accompanying focal and motor symptoms into the context of the emerging pathophysiological knowledge. METHODS: For this narrative review we performed an extensive literature search on the term "absence," and analyzed the plethora of symptoms observed in clinical absences...
January 11, 2018: Epilepsia
https://www.readbyqxmd.com/read/29324886/changes-in-network-connectivity-during-motor-imagery-and-execution
#15
Yun Kwan Kim, Eunhee Park, Ahee Lee, Chang-Hwan Im, Yun-Hee Kim
BACKGROUND: Recent studies of functional or effective connectivity in the brain have reported that motor-related brain regions were activated during motor execution and motor imagery, but the relationship between motor and cognitive areas has not yet been completely understood. The objectives of our study were to analyze the effective connectivity between motor and cognitive networks in order to define network dynamics during motor execution and motor imagery in healthy individuals. Second, we analyzed the differences in effective connectivity between correct and incorrect responses during motor execution and imagery using dynamic causal modeling (DCM) of electroencephalography (EEG) data...
2018: PloS One
https://www.readbyqxmd.com/read/29317185/cortical-inhibition-assessed-using-paired-pulse-tms-eeg-is-increased-in-older-adults
#16
George M Opie, Simranjit K Sidhu, Nigel C Rogasch, Michael C Ridding, John G Semmler
BACKGROUND: Alterations in inhibitory processes mediated by gamma-aminobutyric acid type B (GABAB) receptors may contribute to age-related functional impairments. However, investigation of these circuits using conventional paired-pulse transcranial magnetic stimulation (TMS) at long interstimulus intervals (∼100-200ms) have produced conflicting results in older adults, possibly due to the indirect nature of the TMS motor evoked potential (MEP). OBJECTIVE: To utilise electroencephalography and TMS coregistration (TMS-EEG) to more directly assess age-related changes in GABAB-mediated long-interval intracortical inhibition (LICI)...
December 30, 2017: Brain Stimulation
https://www.readbyqxmd.com/read/29308767/inferring-multi-scale-neural-mechanisms-with-brain-network-modelling
#17
Michael Schirner, Anthony Randal McIntosh, Viktor Jirsa, Gustavo Deco, Petra Ritter
The neurophysiological processes underlying non-invasive brain activity measurements are incompletely understood. Here, we developed a connectome-based brain network model that integrates individual structural and functional data with neural population dynamics to support multi-scale neurophysiological inference. Simulated populations were linked by structural connectivity and, as a novelty, driven by electroencephalography (EEG) source activity. Simulations not only predicted subjects' individual resting-state functional magnetic resonance imaging (fMRI) time series and spatial network topologies over 20 minutes of activity, but more importantly, they also revealed precise neurophysiological mechanisms that underlie and link six empirical observations from different scales and modalities: (1) resting-state fMRI oscillations, (2) functional connectivity networks, (3) excitation-inhibition balance, (4, 5) inverse relationships between α-rhythms, spike-firing and fMRI on short and long time scales, and (6) fMRI power-law scaling...
January 8, 2018: ELife
https://www.readbyqxmd.com/read/29307466/scalp-recorded-high-frequency-oscillations-in-childhood-epileptic-encephalopathy-with-continuous-spike-and-wave-during-sleep-with-different-etiologies
#18
Pan Gong, Jiao Xue, Ping Qian, Haipo Yang, Xiaoyan Liu, Lixin Cai, Kaigui Bian, Zhixian Yang
OBJECTIVE: To investigate high-frequency oscillations (HFOs) in epileptic encephalopathy with continuous spike-and-wave during sleep (CSWS) with different etiologies. METHODS: Twenty-one CSWS patients treated with methylprednisolone were divided into structural group and genetic/unknown group. Comparisons were made between the two etiological groups: selected clinical variables including gender, age parameters, seizure frequencies and antiepileptic drugs; distribution of HFOs in pre-methylprednisolone electroencephalography (EEG) and percentage changes of HFOs and spikes after methylprednisolone treatment...
January 4, 2018: Brain & Development
https://www.readbyqxmd.com/read/29298521/neural-correlates-of-phrase-quadrature-perception-in-harmonic-rhythm-an-eeg-study-using-a-brain-computer-interface
#19
Alicia Fernández-Sotos, Arturo Martínez-Rodrigo, José Moncho-Bogani, José Miguel Latorre, Antonio Fernández-Caballero
For the sake of establishing the neural correlates of phrase quadrature perception in harmonic rhythm, a musical experiment has been designed to induce music-evoked stimuli related to one important aspect of harmonic rhythm, namely the phrase quadrature. Brain activity is translated to action through electroencephalography (EEG) by using a brain-computer interface. The power spectral value of each EEG channel is estimated to obtain how power variance distributes as a function of frequency. The results of processing the acquired signals are in line with previous studies that use different musical parameters to induce emotions...
November 13, 2017: International Journal of Neural Systems
https://www.readbyqxmd.com/read/29297265/short-term-effects-of-binaural-beats-on-eeg-power-functional-connectivity-cognition-gait-and-anxiety-in-parkinson-s-disease
#20
Gerardo Gálvez, Manuel Recuero, Leonides Canuet, Francisco Del-Pozo
We applied rhythmic binaural sound to Parkinson's Disease (PD) patients to investigate its influence on several symptoms of this disease and on Electrophysiology (Electrocardiography and Electroencephalography (EEG)). We conducted a double-blind, randomized controlled study in which rhythmic binaural beats and control were administered over two randomized and counterbalanced sessions (within-subjects repeated-measures design). Patients ([Formula: see text], age [Formula: see text], stage I-III Hoehn & Yahr scale) participated in two sessions of sound stimulation for 10[Formula: see text]min separated by a minimum of 7 days...
November 13, 2017: International Journal of Neural Systems
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