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Functional electroencephalography

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https://www.readbyqxmd.com/read/28631281/detecting-large-scale-networks-in-the-human-brain-using-high-density-electroencephalography
#1
Quanying Liu, Seyedehrezvan Farahibozorg, Camillo Porcaro, Nicole Wenderoth, Dante Mantini
High-density electroencephalography (hdEEG) is an emerging brain imaging technique that can be used to investigate fast dynamics of electrical activity in the healthy and the diseased human brain. Its applications are however currently limited by a number of methodological issues, among which the difficulty in obtaining accurate source localizations. In particular, these issues have so far prevented EEG studies from reporting brain networks similar to those previously detected by functional magnetic resonance imaging (fMRI)...
June 20, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28629974/the-effects-of-changes-in-object-location-on-object-identity-detection-a-simultaneous-eeg-fmri-study
#2
Ping Yang, Chenggui Fan, Min Wang, Noa Fogelson, Ling Li
Object identity and location are bound together to form a unique integration that is maintained and processed in visual working memory (VWM). Changes in task-irrelevant object location have been shown to impair the retrieval of memorial representations and the detection of object identity changes. However, the neural correlates of this cognitive process remain largely unknown. In the present study, we aim to investigate the underlying brain activation during object color change detection and the modulatory effects of changes in object location and VWM load...
June 16, 2017: NeuroImage
https://www.readbyqxmd.com/read/28628556/real-time-imaging-of-epileptic-seizures-in-rats-using-electrical-impedance-tomography
#3
Lei Wang, Yang Sun, Xinmin Xu, Xiuzhen Dong, Feng Gao
The presence of multiple or diffuse lesions on imaging is a contraindication to surgery for patients with intractable epilepsy. Theoretically, as a functional imaging technique, electrical impedance tomography (EIT) can accurately image epileptic foci. However, most current studies are limited to examining epileptic spikes and few studies use EIT for real-time imaging of seizure activity. Moreover, little is known about changes in electrical impedance during seizures. In this study, we used EIT to monitor seizure progression in real time and analyzed changes in electrical impedance during seizures...
June 16, 2017: Neuroreport
https://www.readbyqxmd.com/read/28628224/human-exposure-to-power-frequency-magnetic-fields-up-to-7-6%C3%A2-mt-an-integrated-eeg-fmri-study
#4
Julien Modolo, Alex W Thomas, Alexandre Legros
We assessed the effects of power-line frequency (60 Hz in North America) magnetic fields (MF) in humans using simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI). Twenty-five participants were enrolled in a pseudo-double-blind experiment involving "real" or "sham" exposure to sinusoidal 60 Hz MF exposures delivered using the gradient coil of an MRI scanner following two conditions: (i) 10 s exposures at 3 mT (10 repetitions); (ii) 2 s exposures at 7.6 mT (100 repetitions)...
June 19, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28622527/alzheimer-s-disease-the-state-of-the-art-in-resting-state-magnetoencephalography
#5
REVIEW
M M A Engels, W M van der Flier, C J Stam, A Hillebrand, Ph Scheltens, E C W van Straaten
Alzheimer's disease (AD) is accompanied by functional brain changes that can be detected in imaging studies, including electromagnetic activity recorded with magnetoencephalography (MEG). Here, we systematically review the studies that have examined resting-state MEG changes in AD and identify areas that lack scientific or clinical progress. Three levels of MEG analysis will be covered: (i) single-channel signal analysis, (ii) pairwise analyses over time series, which includes the study of interdependencies between two time series and (iii) global network analyses...
May 21, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28620292/dynamic-responses-in-brain-networks-to-social-feedback-a-dual-eeg-acquisition-study-in-adolescent-couples
#6
Ching-Chang Kuo, Thao Ha, Ashley M Ebbert, Don M Tucker, Thomas J Dishion
Adolescence is a sensitive period for the development of romantic relationships. During this period the maturation of frontolimbic networks is particularly important for the capacity to regulate emotional experiences. In previous research, both functional magnetic resonance imaging (fMRI) and dense array electroencephalography (dEEG) measures have suggested that responses in limbic regions are enhanced in adolescents experiencing social rejection. In the present research, we examined social acceptance and rejection from romantic partners as they engaged in a Chatroom Interact Task...
2017: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/28619655/comparison-of-the-spatial-resolution-of-source-imaging-techniques-in-high-density-eeg-and-meg
#7
T Hedrich, G Pellegrino, E Kobayashi, J M Lina, C Grova
BACKGROUND: The present study aims at evaluating and comparing electrical and magnetic distributed source imaging methods applied to high-density Electroencephalography (hdEEG) and Magnetoencephalography (MEG) data. We used resolution matrices to characterize spatial resolution properties of Minimum Norm Estimate (MNE), dynamic Statistical Parametric Mapping (dSPM), standardized Low-Resolution Electromagnetic Tomography (sLORETA) and coherent Maximum Entropy on the Mean (cMEM, an entropy-based technique)...
June 12, 2017: NeuroImage
https://www.readbyqxmd.com/read/28615277/alterations-in-the-brain-s-connectome-during-recovery-from-severe-traumatic-brain-injury-protocol-for-a-longitudinal-prospective-study
#8
Virginia Conde, Sara Hesby Andreasen, Tue Hvass Petersen, Karen Busted Larsen, Karine Madsen, Kasper Winther Andersen, Irina Akopian, Kristoffer Hougaard Madsen, Christian Pilebæk Hansen, Ingrid Poulsen, Lars Peter Kammersgaard, Hartwig Roman Siebner
INTRODUCTION: Traumatic brain injury (TBI) is considered one of the most pervasive causes of disability in people under the age of 45. TBI often results in disorders of consciousness, and clinical assessment of the state of consciousness in these patients is challenging due to the lack of behavioural responsiveness. Functional neuroimaging offers a means to assess these patients without the need for behavioural signs, indicating that brain connectivity plays a major role in consciousness emergence and maintenance...
June 14, 2017: BMJ Open
https://www.readbyqxmd.com/read/28613974/inhibition-of-lateral-prefrontal-cortex-produces-emotionally-biased-first-impressions-a-transcranial-magnetic-stimulation-and-electroencephalography-study
#9
Regina C Lapate, Jason Samaha, Bas Rokers, Hamdi Hamzah, Bradley R Postle, Richard J Davidson
Optimal functioning in everyday life requires the ability to override reflexive emotional responses and prevent affective spillover to situations or people unrelated to the source of emotion. In the current study, we investigated whether the lateral prefrontal cortex (lPFC) causally regulates the influence of emotional information on subsequent judgments. We disrupted left lPFC function using transcranial magnetic stimulation (TMS) and recorded electroencephalography (EEG) before and after. Subjects evaluated the likeability of novel neutral faces after a brief exposure to a happy or fearful face...
June 1, 2017: Psychological Science
https://www.readbyqxmd.com/read/28612504/effect-of-attention-bias-modification-on-brain-function-and-anxiety-in-patients-with-irritable-bowel-syndrome-a-preliminary-electroencephalogram-and-psycho-behavioral-study
#10
J Tayama, T Saigo, S Ogawa, A Takeoka, T Hamaguchi, M Hayashida, S Fukudo, S Shirabe
BACKGROUND: Gastrointestinal symptoms of irritable bowel syndrome (IBS) show a reciprocal relationship with anxiety. In this intervention-based study, we investigated the utility of attention bias modification (ABM) therapy in patients with IBS. We hypothesized that IBS-related electroencephalographic abnormalities would be normalized after ABM therapy. METHODS: Seventeen patients with IBS and 13 healthy subjects completed five ABM intervention sessions over a 2-month period...
June 14, 2017: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/28610902/post-stimulus-fmri-and-eeg-responses-evidence-for-a-neuronal-origin-hypothesised-to-be-inhibitory
#11
K J Mullinger, M T Cherukara, R B Buxton, S T Francis, S D Mayhew
Post-stimulus undershoots, negative responses following cessation of stimulation, are widely observed in functional magnetic resonance (fMRI) blood oxygenation level dependent (BOLD) data. However, the debate surrounding whether the origin of this response phase is neuronal or vascular, and whether it provides functionally relevant information, that is additional to what is contained in primary response, means that undershoots are widely overlooked. We simultaneously recorded electroencephalography (EEG), BOLD and cerebral blood-flow (CBF) [obtained from arterial spin labelled (ASL) fMRI] fMRI responses to hemifield checkerboard stimulation to test the potential neural origin of the fMRI post-stimulus undershoot...
June 10, 2017: NeuroImage
https://www.readbyqxmd.com/read/28608960/theta-band-power-increases-in-the-posterior-hippocampus-predict-successful-episodic-memory-encoding-in-humans
#12
Jui Jui Lin, Michael Rugg, Sandhitsu Das, Joel Stein, Daniel Rizzuto, Michael Kahana, Bradley Lega
Functional differences in the anterior and posterior hippocampus during episodic memory processing have not been examined in human electrophysiological data. This is in spite of strong evidence for such differences in rodent data, including greater place cell specificity in the dorsal hippocampus, greater sensitivity to the aversive or motivational content of memories in ventral regions, connectivity analyses identifying preferential ventral hippocampal connections with the amygdala, and gene expression analyses identifying a dorsal-ventral gradient...
June 13, 2017: Hippocampus
https://www.readbyqxmd.com/read/28605741/electroencephalography-patterns-and-prognosis-in-acute-ischemic-stroke
#13
Fabricio O Lima, João A G Ricardo, Ana C Coan, Diogo C Soriano, Wagner M Avelar, Li L Min
BACKGROUND AND PURPOSE: The prognostic significance of interictal epileptiform discharges (IED) and periodic patterns (PP) after ischemic stroke has not been assessed. We sought to test whether IED and PP, detected on standard Electroencephalography (EEG) performed during the acute phase of ischemic stroke are associated with a worse functional outcome. METHODS: One-hundred-fifty-seven patients 18 years or older with a diagnosis of acute ischemic stroke presenting within 72 h from stroke onset were prospectively enrolled and followed...
June 13, 2017: Cerebrovascular Diseases
https://www.readbyqxmd.com/read/28604790/sparse-eeg-meg-source-estimation-via-a-group-lasso
#14
Michael Lim, Justin M Ales, Benoit R Cottereau, Trevor Hastie, Anthony M Norcia
Non-invasive recordings of human brain activity through electroencephalography (EEG) or magnetoencelphalography (MEG) are of value for both basic science and clinical applications in sensory, cognitive, and affective neuroscience. Here we introduce a new approach to estimating the intra-cranial sources of EEG/MEG activity measured from extra-cranial sensors. The approach is based on the group lasso, a sparse-prior inverse that has been adapted to take advantage of functionally-defined regions of interest for the definition of physiologically meaningful groups within a functionally-based common space...
2017: PloS One
https://www.readbyqxmd.com/read/28604171/abnormal-eeg-responses-to-tms-during-the-cortical-silent-period-are-associated-with-hand-function-in-chronic-stroke
#15
Whitney A Gray, Jacqueline A Palmer, Steven L Wolf, Michael R Borich
BACKGROUND: Abnormal brain excitability influences recovery after stroke at which time a prolonged transcranial magnetic stimulation (TMS)-induced electromyographic silent period is thought to reflect abnormal inhibitory interneuron excitability. Cortical excitability can be probed directly during the silent period using concurrent electroencephalography (EEG) of TMS-evoked responses. OBJECTIVE: The primary study objectives were to characterize TMS-evoked cortical potentials (TEPs) using EEG and to investigate associations with persistent hand and arm motor dysfunction in individuals with chronic stroke...
June 1, 2017: Neurorehabilitation and Neural Repair
https://www.readbyqxmd.com/read/28597185/neural-correlates-of-sensory-hyporesponsiveness-in-toddlers-at-high-risk-for-autism-spectrum-disorder
#16
David M Simon, Cara R Damiano, Tiffany G Woynaroski, Lisa V Ibañez, Michael Murias, Wendy L Stone, Mark T Wallace, Carissa J Cascio
Altered patterns of sensory responsiveness are a frequently reported feature of Autism Spectrum Disorder (ASD). Younger siblings of individuals with ASD are at a greatly elevated risk of a future diagnosis of ASD, but little is known about the neural basis of sensory responsiveness patterns in this population. Younger siblings (n = 20) of children diagnosed with ASD participated in resting electroencephalography (EEG) at an age of 18 months. Data on toddlers' sensory responsiveness were obtained using the Sensory Experiences Questionnaire...
June 8, 2017: Journal of Autism and Developmental Disorders
https://www.readbyqxmd.com/read/28595352/neuropsychology-outcomes-following-trephine-epilepsy-surgery-the-inferior-temporal-gyrus-approach-for-amygdalohippocampectomy-in-medically-refractory-mesial-temporal-lobe-epilepsy
#17
Mike R Schoenberg, William E Clifton, Ryan W Sever, Fernando L Vale
BACKGROUND: Surgery is indicated in cases of mesial temporal lobe epilepsy(MTLE) that are refractory to medical management. The inferior temporal gyrus (ITG) approach provides access to the mesial temporal lobe (MTL) structures with minimal tissue disruption. Reported neuropsychology outcomes following this approach are limited. OBJECTIVE: To report neuropsychological outcomes using an ITG approach to amygdalohippocampectomy (AH) in patients with medically refractory MTLE based on a prospective design...
June 8, 2017: Neurosurgery
https://www.readbyqxmd.com/read/28594285/cognitive-event-related-potentials-during-the-sub-acute-phase-of-severe-traumatic-brain-injury-and-their-relationship-to-outcome
#18
Solveig L Hauger, Kjell Olafsen, Caroline Schnakers, Nada Andelic, Kristian Bernhard Nilsen, Eirik Helseth, Ingrid Funderud, Stein Andersson, Anne-Kristine Schanke, Marianne Løvstad
Predicting outcome in the early phase after severe traumatic brain injury (sTBI) is a major clinical challenge, particularly identifying patients with potential of good cognitive outcome. The current single center prospective study aimed to explore presence and normalization of electroencephalography (EEG)-based event related potentials (ERPs) in the early phase following sTBI, and their relationship to functional and cognitive outcome 6 months post-injury. Fourteen adult patients with sTBI were recruited from the neurointensive care unit (mean age=38...
June 8, 2017: Journal of Neurotrauma
https://www.readbyqxmd.com/read/28593191/at-what-latency-does-the-phase-of-brain-oscillations-influence-perception
#19
Sasskia Brüers, Rufin VanRullen
Recent evidence has shown a rhythmic modulation of perception: prestimulus ongoing electroencephalography (EEG) phase in the θ (4-8 Hz) and α (8-13 Hz) bands has been directly linked with fluctuations in target detection. In fact, the ongoing EEG phase directly reflects cortical excitability: it acts as a gating mechanism for information flow at the neuronal level. Consequently, the key phase modulating perception should be the one present in the brain when the stimulus is actually being processed. Most previous studies, however, reported phase modulation peaking 100 ms or more before target onset...
May 2017: ENeuro
https://www.readbyqxmd.com/read/28592794/the-dynamic-functional-core-network-of-the-human-brain-at-rest
#20
A Kabbara, W El Falou, M Khalil, F Wendling, M Hassan
The human brain is an inherently complex and dynamic system. Even at rest, functional brain networks dynamically reconfigure in a well-organized way to warrant an efficient communication between brain regions. However, a precise characterization of this reconfiguration at very fast time-scale (hundreds of millisecond) during rest remains elusive. In this study, we used dense electroencephalography data recorded during task-free paradigm to track the fast temporal dynamics of spontaneous brain networks. Results obtained from network-based analysis methods revealed the existence of a functional dynamic core network formed of a set of key brain regions that ensure segregation and integration functions...
June 7, 2017: Scientific Reports
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