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Brain Topography

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https://www.readbyqxmd.com/read/29222686/eeg-source-imaging-indices-of-cognitive-control-show-associations-with-dopamine-system-genes
#1
G McLoughlin, J Palmer, S Makeig, N Bigdely-Shamlo, T Banaschewski, M Laucht, D Brandeis
Cognitive or executive control is a critical mental ability, an important marker of mental illness, and among the most heritable of neurocognitive traits. Two candidate genes, catechol-O-methyltransferase (COMT) and DRD4, which both have a roles in the regulation of cortical dopamine, have been consistently associated with cognitive control. Here, we predicted that individuals with the COMT Met/Met allele would show improved response execution and inhibition as indexed by event-related potentials in a Go/NoGo task, while individuals with the DRD4 7-repeat allele would show impaired brain activity...
December 8, 2017: Brain Topography
https://www.readbyqxmd.com/read/29218677/40%C3%A2-hz-auditory-steady-state-response-the-impact-of-handedness-and-gender
#2
Sigita Melynyte, Evaldas Pipinis, Vaida Genyte, Aleksandras Voicikas, Tonia Rihs, Inga Griskova-Bulanova
The 40 Hz auditory steady-state response (ASSR) is a periodic response to a periodic stimulation. Its sources are located in the primary auditory cortex and the asymmetry of the planum temporale has previously been associated with hand preference and gender-related differences; thus subject's handedness and gender could potentially influence ASSRs. Nevertheless, electrophysiological studies of ASSRs are mainly dominated by right-handed participants and the observed findings can only be generalized to the right-handed populations...
December 7, 2017: Brain Topography
https://www.readbyqxmd.com/read/29204789/a-preliminary-study-on-precision-image-guidance-for-electrode-placement-in-an-eeg-study
#3
Sangseo Jeon, Jongho Chien, Chanho Song, Jaesung Hong
Conventional methods for positioning electroencephalography electrodes according to the international 10/20 system are based on the manual identification of the principal 10/20 landmarks via visual inspection and palpation, inducing intersession variations in their determined locations due to structural ambiguity or poor visibility. To address the variation issue, we propose an image guidance system for precision electrode placement. Following the electrode placement according to the 10/20 system, affixed electrodes are laser-scanned together with the facial surface...
December 4, 2017: Brain Topography
https://www.readbyqxmd.com/read/29170853/brain-networks-are-independently-modulated-by-donepezil-sleep-and-sleep-deprivation
#4
Jonathan Wirsich, Marc Rey, Maxime Guye, Christian Bénar, Laura Lanteaume, Ben Ridley, Sylviane Confort-Gouny, Catherine Cassé-Perrot, Elisabeth Soulier, Patrick Viout, Franck Rouby, Marie-Noëlle Lefebvre, Christine Audebert, Romain Truillet, Elisabeth Jouve, Pierre Payoux, David Bartrés-Faz, Régis Bordet, Jill C Richardson, Claudio Babiloni, Paolo Maria Rossini, Joelle Micallef, Olivier Blin, Jean-Philippe Ranjeva
Resting-state connectivity has been widely studied in the healthy and pathological brain. Less well-characterized are the brain networks altered during pharmacological interventions and their possible interaction with vigilance. In the hopes of finding new biomarkers which can be used to identify cortical activity and cognitive processes linked to the effects of drugs to treat neurodegenerative diseases such as Alzheimer's disease, the analysis of networks altered by medication would be particularly interesting...
November 23, 2017: Brain Topography
https://www.readbyqxmd.com/read/29168017/a-comparative-study-of-the-robustness-of-frequency-domain-connectivity-measures-to-finite-data-length
#5
Sara Sommariva, Alberto Sorrentino, Michele Piana, Vittorio Pizzella, Laura Marzetti
In this work we use numerical simulation to investigate how the temporal length of the data affects the reliability of the estimates of brain connectivity from EEG time-series. We assume that the neural sources follow a stable MultiVariate AutoRegressive model, and consider three connectivity metrics: imaginary part of coherency (IC), generalized partial directed coherence (gPDC) and frequency-domain granger causality (fGC). In order to assess the statistical significance of the estimated values, we use the surrogate data test by generating phase-randomized and autoregressive surrogate data...
November 22, 2017: Brain Topography
https://www.readbyqxmd.com/read/29127530/eeg-frequency-tagging-and-input-output-comparison-in-rhythm-perception
#6
REVIEW
Sylvie Nozaradan, Peter E Keller, Bruno Rossion, André Mouraux
The combination of frequency-tagging with electroencephalography (EEG) has recently proved fruitful for understanding the perception of beat and meter in musical rhythm, a common behavior shared by humans of all cultures. EEG frequency-tagging allows the objective measurement of input-output transforms to investigate beat perception, its modulation by exogenous and endogenous factors, development, and neural basis. Recent doubt has been raised about the validity of comparing frequency-domain representations of auditory rhythmic stimuli and corresponding EEG responses, assuming that it implies a one-to-one mapping between the envelope of the rhythmic input and the neural output, and that it neglects the sensitivity of frequency-domain representations to acoustic features making up the rhythms...
November 10, 2017: Brain Topography
https://www.readbyqxmd.com/read/29124547/online-reduction-of-artifacts-in-eeg-of-simultaneous-eeg-fmri-using-reference-layer-adaptive-filtering-rlaf
#7
David Steyrl, Gunther Krausz, Karl Koschutnig, Günter Edlinger, Gernot R Müller-Putz
Simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI) allow us to study the active human brain from two perspectives concurrently. Signal processing based artifact reduction techniques are mandatory for this, however, to obtain reasonable EEG quality in simultaneous EEG-fMRI. Current artifact reduction techniques like average artifact subtraction (AAS), typically become less effective when artifact reduction has to be performed on-the-fly. We thus present and evaluate a new technique to improve EEG quality online...
November 9, 2017: Brain Topography
https://www.readbyqxmd.com/read/29124546/fast-neural-dynamics-of-proactive-cognitive-control-in-a-task-switching-analogue-of-the-wisconsin-card-sorting-test
#8
Gema Díaz-Blancat, Juan García-Prieto, Fernando Maestú, Francisco Barceló
One common assumption has been that prefrontal executive control is mostly required for target detection (Posner and Petersen in Ann Rev Neurosci 13:25-42, 1990). Alternatively, cognitive control has also been related to anticipatory updating of task-set (contextual) information, a view that highlights proactive control processes. Frontoparietal cortical networks contribute to both proactive control and reactive target detection, although their fast dynamics are still largely unexplored. To examine this, we analyzed rapid magnetoencephalographic (MEG) source activations elicited by task cues and target cards in a task-cueing analogue of the Wisconsin Card Sorting Test...
November 9, 2017: Brain Topography
https://www.readbyqxmd.com/read/29119311/cortical-processing-of-level-cues-for-spatial-hearing-is-impaired-in-children-with-prelingual-deafness-despite-early-bilateral-access-to-sound
#9
Vijayalakshmi Easwar, Hiroshi Yamazaki, Michael Deighton, Blake Papsin, Karen Gordon
Bilateral cochlear implantation aims to restore binaural hearing, important for spatial hearing, to children who are deaf. Improvements over unilateral implant use are attributed largely to the detection of interaural level differences (ILDs) but emerging evidence of impaired sound localization and binaural fusion suggest that these binaural cues are abnormally coded by the auditory system. We used multichannel electroencephalography (EEG) to assess cortical responses to ILDs in two groups: 13 children who received early bilateral cochlear implants (CIs) simultaneously, known to protect the developing auditory cortices from unilaterally driven reorganization, and 15 age matched peers with normal hearing...
November 8, 2017: Brain Topography
https://www.readbyqxmd.com/read/29101492/intrinsic-network-connectivity-patterns-underlying-specific-dimensions-of-impulsiveness-in-healthy-young-adults
#10
Katharina M Kubera, Dusan Hirjak, Nadine D Wolf, Fabio Sambataro, Philipp A Thomann, R Christian Wolf
Impulsiveness is a central human personality trait and of high relevance for the development of several mental disorders. Impulsiveness is a multidimensional construct, yet little is known about dimension-specific neural correlates. Here, we address the question whether motor, attentional and non-planning components, as measured by the Barratt Impulsiveness Scale (BIS-11), are associated with distinct or overlapping neural network activity. In this study, we investigated brain activity at rest and its relationship to distinct dimensions of impulsiveness in 30 healthy young adults (m/f = 13/17; age mean/SD = 26...
November 3, 2017: Brain Topography
https://www.readbyqxmd.com/read/29063237/a-tutorial-review-on-multi-subject-decomposition-of-eeg
#11
René J Huster, Liisa Raud
Over the last years we saw a steady increase in the relevance of big neuroscience data sets, and with it grew the need for analysis tools capable of handling such large data sets while simultaneously extracting properties of brain activity that generalize across subjects. For functional magnetic resonance imaging, multi-subject or group-level independent component analysis provided a data-driven approach to extract intrinsic functional networks, such as the default mode network. Meanwhile, this methodological framework has been adapted for the analysis of electroencephalography (EEG) data...
October 23, 2017: Brain Topography
https://www.readbyqxmd.com/read/29038979/decreased-metabolism-in-the-posterior-medial-network-with-concomitantly-increased-metabolism-in-the-anterior-temporal-network-during-transient-global-amnesia
#12
SangHak Yi, Young Ho Park, Jae-Won Jang, Jae-Sung Lim, In Kook Chun, SangYun Kim
Perturbation of corticohippocampal circuits is a key step in the pathogenesis of transient global amnesia. We evaluated the spatial distribution of altered cerebral metabolism to determine the location of the corticohippocampal circuits perturbed during the acute stage of transient global amnesia. A consecutive series of 12 patients with transient global amnesia who underwent (18)F-fluorodeoxyglucose positron emission tomography within 3 days after symptom onset was identified. We used statistical parametric mapping with two contrasts to identify regions of decreased and increased brain metabolism in transient global amnesia patients compared with 25 age-matched controls...
October 16, 2017: Brain Topography
https://www.readbyqxmd.com/read/29032397/correction-to-extent-and-location-of-the-excitatory-and-inhibitory-cortical-hand-representation-maps-a-navigated-transcranial-magnetic-stimulation-study
#13
Minna Pitkänen, Elisa Kallioniemi, Petro Julkunen
The original version of this article unfortunately contained an error. An error in the transformation between coordinate systems used to derive part of the results has been noticed.
October 14, 2017: Brain Topography
https://www.readbyqxmd.com/read/29022116/two-dimensional-temporal-clustering-analysis-for-patients-with-epilepsy-detecting-epilepsy-related-information-in-eeg-fmri-concordant-discordant-and-spike-less-patients
#14
Danilo Maziero, Tonicarlo R Velasco, Carlos E G Salmon, Victoria L Morgan
EEG acquired simultaneously with fMRI (EEG-fMRI) is a multimodal method that has shown promise in mapping the seizure onset zone in patients with focal epilepsy. However, there are many instances when this method is unsuccessful or not applicable, and other data driven fMRI methods may be utilized. One such method is the two-dimensional temporal clustering analysis (2dTCA). In this study we compared the classic EEG-fMRI and 2dTCA performance in mapping regions related to the seizure onset region in 18 focal epilepsy patients (12 presenting interictal epileptiform discharges (IEDs), during EEG-fMRI acquisition) with Engel I or II surgical outcome...
October 11, 2017: Brain Topography
https://www.readbyqxmd.com/read/28986718/frontal-lobe-connectivity-and-network-community-characteristics-are%C3%A2-associated-with-the-outcome-of-subthalamic-nucleus-deep-brain-stimulation-in-patients-with-parkinson-s-disease
#15
Nabin Koirala, Vinzenz Fleischer, Martin Glaser, Kirsten E Zeuner, Günther Deuschl, Jens Volkmann, Muthuraman Muthuraman, Sergiu Groppa
Deep brain stimulation (DBS) of the subthalamic nucleus (STN) is nowadays an evidence-based state of the art therapy option for motor and non-motor symptoms in patients with Parkinson's disease (PD). However, the exact anatomical regions of the cerebral network that are targeted by STN-DBS have not been precisely described and no definitive pre-intervention predictors of the clinical response exist. In this study, we test the hypothesis that the clinical effectiveness of STN-DBS depends on the connectivity profile of the targeted brain networks...
October 6, 2017: Brain Topography
https://www.readbyqxmd.com/read/28983770/permutation-mutual-information-a-novel-approach-for-measuring-neuronal-phase-amplitude-coupling
#16
Ning Cheng, Qun Li, Sitong Wang, Rubin Wang, Tao Zhang
Cross-frequency phase-amplitude coupling (PAC) in neuronal oscillations network plays an important functional role in large scale neuronal communication and neuronal encoding. In the present study, a novel approach named permutation mutual information (PMI) was applied in measuring PAC. It is derived from the permutation entropy based on the mutual information theory, by which the mutual information of permutations of two time series can be evaluated. In order to verify the ability of PMI, a numerical test was performed by using both simulation data and experimental data...
October 5, 2017: Brain Topography
https://www.readbyqxmd.com/read/28983703/mapping-slow-waves-by-eeg-topography-and-source-localization-effects-of-sleep-deprivation
#17
Alessia Bersagliere, Roberto D Pascual-Marqui, Leila Tarokh, Peter Achermann
Slow waves are a salient feature of the electroencephalogram (EEG) during non-rapid eye movement (non-REM) sleep. The aim of this study was to assess the topography of EEG power and the activation of brain structures during slow wave sleep under normal conditions and after sleep deprivation. Sleep EEG recordings during baseline and recovery sleep after 40 h of sustained wakefulness were analyzed (eight healthy young men, 27 channel EEG). Power maps were computed for the first non-REM sleep episode (where sleep pressure is highest) in baseline and recovery sleep, at frequencies between 0...
October 5, 2017: Brain Topography
https://www.readbyqxmd.com/read/28933012/erratum-to-the-callosal-relay-model-of-interhemispheric-communication-new-evidence-from-effective-connectivity-analysis
#18
Saskia Steinmann, Jan Meier, Guido Nolte, Andreas K Engel, Gregor Leicht, Christoph Mulert
No abstract text is available yet for this article.
September 20, 2017: Brain Topography
https://www.readbyqxmd.com/read/28936792/alpha-theta-neurofeedback-increases-mentalization-and-default-mode-network-connectivity-in-a-non-clinical-sample
#19
Claudio Imperatori, Giacomo Della Marca, Noemi Amoroso, Giulia Maestoso, Enrico Maria Valenti, Chiara Massullo, Giuseppe Alessio Carbone, Anna Contardi, Benedetto Farina
Several studies showed the effectiveness of alpha/theta (A/T) neurofeedback training in treating some psychiatric conditions. Despite the evidence of A/T effectiveness, the psychological and neurobiological bases of its effects is still unclear. The aim of the present study was to explore the usefulness of the A/T training in increasing mentalization in a non-clinical sample. The modifications of electroencephalographic (EEG) functional connectivity in Default Mode Network (DMN) associated with A/T training were also investigated...
November 2017: Brain Topography
https://www.readbyqxmd.com/read/28917017/physiological-ripples-%C3%A2-%C3%A2-100%C3%A2-hz-in-spike-free-scalp-eegs-of-children-with-and-without-epilepsy
#20
Anne H Mooij, Renee C M A Raijmann, Floor E Jansen, Kees P J Braun, Maeike Zijlmans
Pathological high frequency oscillations (HFOs, >80 Hz) are considered new biomarkers for epilepsy. They have mostly been recorded invasively, but pathological ripples (80-250 Hz) can also be found in scalp EEGs with frequent epileptiform spikes. Physiological HFOs also exist. They have been recorded invasively in hippocampus and neocortex. There are no reports of spontaneously occurring physiological HFOs recorded with scalp EEG. We aimed to study ripples in spike-free scalp EEGs. We included 23 children (6 with, 17 without epilepsy) who had an EEG without interictal epileptiform spikes recorded during sleep...
November 2017: Brain Topography
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