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Brain Topography

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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
#1
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
#2
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
#3
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
#4
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
#5
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
#6
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/28936792/alpha-theta-neurofeedback-increases-mentalization-and-default-mode-network-connectivity-in-a-non-clinical-sample
#7
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...
September 21, 2017: Brain Topography
https://www.readbyqxmd.com/read/28933012/erratum-to-the-callosal-relay-model-of-interhemispheric-communication-new-evidence-from-effective-connectivity-analysis
#8
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/28921389/altered-structure-and-intrinsic-functional-connectivity-in-post-stroke-aphasia
#9
Mi Yang, Pu Yang, Yun-Shuang Fan, Jiao Li, Dezhong Yao, Wei Liao, Huafu Chen
Previous studies have demonstrated that alterations of gray matter exist in post-stroke aphasia (PSA) patients. However, so far, few studies combined structural alterations of gray matter volume (GMV) and intrinsic functional connectivity (iFC) imbalances of resting-state functional MRI to investigate the mechanism underlying PSA. The present study investigated specific regions with GMV abnormality in patients with PSA (n = 17) and age- and sex- matched healthy controls (HCs, n = 20) using voxel-based morphometry...
September 18, 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
#10
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...
September 15, 2017: Brain Topography
https://www.readbyqxmd.com/read/28916867/reorganization-of-motor-representations-in-patients-with-brain-lesions-a-navigated-transcranial-magnetic-stimulation-study
#11
Lucia Bulubas, Nico Sollmann, Noriko Tanigawa, Claus Zimmer, Bernhard Meyer, Sandro M Krieg
This is an explorative study applying presurgical navigated transcranial magnetic stimulation (nTMS) to investigate the spatial distributions of motor sites to reveal tumor-induced brain plasticity in patients with brain tumors. We analyzed nTMS-based motor maps derived from presurgical mapping of 100 patients with motor eloquently located brain tumors (tumors in the frontal lobe, the precentral gyrus [PrG], the postcentral gyrus [PoG], the remaining parietal lobe, or the temporal lobe). Based on these motor maps, we systematically investigated changes in motor evoked potential (MEP) counts among 4 gyri (PrG, PoG, medial frontal gyrus, and superior frontal gyrus) between subgroups of patients according to the tumor location in order to depict the tumor's influence on reorganization...
September 15, 2017: Brain Topography
https://www.readbyqxmd.com/read/28913778/neural-basis-of-early-somatosensory-change-detection-a-magnetoencephalography-study
#12
G Naeije, T Vaulet, V Wens, B Marty, S Goldman, X De Tiège
The mismatch negativity (MMN) reflects the early detection of changes in sensory stimuli at the cortical level. The mechanisms underlying its genesis remain debated. This magnetoencephalography study investigates the spatio-temporal dynamics and the neural mechanisms of the magnetic somatosensory MMN. Somatosensory evoked magnetic fields elicited by tactile stimulation of the right fingertip (Single), tactile stimulation of the right middle phalanx and fingertip (Double) or omissions (Omitted) of tactile stimuli were studied in different paradigms: in oddballs where Double/Omitted followed a sequence of four Single, in sequences of two stimuli where Double occurred after one Single, and in random presentation of Double only...
September 14, 2017: Brain Topography
https://www.readbyqxmd.com/read/28905146/long-range-temporal-correlations-reflect-treatment-response-in-the-electroencephalogram-of-patients-with-infantile-spasms
#13
Rachel J Smith, Amanda Sugijoto, Neggy Rismanchi, Shaun A Hussain, Daniel W Shrey, Beth A Lopour
Infantile spasms syndrome is an epileptic encephalopathy in which prompt diagnosis and treatment initiation are critical to therapeutic response. Diagnosis of the disease heavily depends on the identification of characteristic electroencephalographic (EEG) patterns, including hypsarrhythmia. However, visual assessment of the presence and characteristics of hypsarrhythmia is challenging because multiple variants of the pattern exist, leading to poor inter-rater reliability. We investigated whether a quantitative measurement of the control of neural synchrony in the EEGs of infantile spasms patients could be used to reliably distinguish the presence of hypsarrhythmia and indicate successful treatment outcomes...
September 13, 2017: Brain Topography
https://www.readbyqxmd.com/read/28879632/real-time-clustered-multiple-signal-classification-rtc-music
#14
Christoph Dinh, Lorenz Esch, Johannes Rühle, Steffen Bollmann, Daniel Güllmar, Daniel Baumgarten, Matti S Hämäläinen, Jens Haueisen
Magnetoencephalography (MEG) and electroencephalography provide a high temporal resolution, which allows estimation of the detailed time courses of neuronal activity. However, in real-time analysis of these data two major challenges must be handled: the low signal-to-noise ratio (SNR) and the limited time available for computations. In this work, we present real-time clustered multiple signal classification (RTC-MUSIC) a real-time source localization algorithm, which can handle low SNRs and can reduce the computational effort...
September 6, 2017: Brain Topography
https://www.readbyqxmd.com/read/28879409/erratum-to-minimum-norm-estimation-of-motor-representations-in-navigated-tms-mappings
#15
Minna Pitkänen, Elisa Kallioniemi, Petro Julkunen, Maria Nazarova, Jaakko O Nieminen, Risto J Ilmoniemi
No abstract text is available yet for this article.
September 6, 2017: Brain Topography
https://www.readbyqxmd.com/read/28875402/stable-scalp-eeg-spatiospectral-patterns-across-paradigms-estimated-by-group-ica
#16
René Labounek, David A Bridwell, Radek Mareček, Martin Lamoš, Michal Mikl, Tomáš Slavíček, Petr Bednařík, Jaromír Baštinec, Petr Hluštík, Milan Brázdil, Jiří Jan
Electroencephalography (EEG) oscillations reflect the superposition of different cortical sources with potentially different frequencies. Various blind source separation (BSS) approaches have been developed and implemented in order to decompose these oscillations, and a subset of approaches have been developed for decomposition of multi-subject data. Group independent component analysis (Group ICA) is one such approach, revealing spatiospectral maps at the group level with distinct frequency and spatial characteristics...
September 5, 2017: Brain Topography
https://www.readbyqxmd.com/read/28808819/separating-the-idea-from-the-action-a-sloreta-study
#17
Martin Rakusa, Pierpaolo Busan, Piero Paolo Battaglini, Janez Zidar
Simple imaginary movements activate similar cortical and subcortical areas to actual movements, chiefly in the sensory-motor network. However, only a few studies also examined the imagery of more skilful movements such as reaching. Ten volunteers performed reaching movements or imagined the same movements. EEG was simultaneously recorded and analysed with sLORETA, which compared the preparation for actual and imagined reaching with respect to their baseline and between tasks. Major differences between them were found at three time intervals after target presentation, always in favour of the actual reaching condition...
August 14, 2017: Brain Topography
https://www.readbyqxmd.com/read/28808817/electrophysiological-modulation-in-an-effort-to-complete-illusory-figures-configuration-illusory-contour-and-closure-effects
#18
Tommaso Poscoliero, Massimo Girelli
Figure recognition process: From the coarse configuration standing from the background to the closure of a meaningful shape, was investigated by ERP technique. ERP components at different latencies from stimulus onset allowed to tap into the figure recognition process at discrete time-points when different cognitive operations take place. In this study, we present two experiments where the support-ratio (SR) of illusory figures was manipulated to vary continuously the recognition of geometrical figures. In the first experiment three shapes were used to vary the SR and the P1 component (80-130 ms) was modulated by the configuration-effect explained, in part for the first time, with the unbalanced physical stimulation between upper and lower visual field...
August 14, 2017: Brain Topography
https://www.readbyqxmd.com/read/28803269/the-callosal-relay-model-of-interhemispheric-communication-new-evidence-from-effective-connectivity-analysis
#19
Saskia Steinmann, Jan Meier, Guido Nolte, Andreas K Engel, Gregor Leicht, Christoph Mulert
Interhemispheric auditory connectivity via the corpus callosum has been demonstrated to be important for normal speech processing. According to the callosal relay model, directed information flow from the right to the left auditory cortex has been suggested, but this has not yet been proven. For this purpose, 33 healthy participants were investigated with 64-channel EEG while performing the dichotic listening task in which two different consonant-vowel syllables were presented simultaneously to the left (LE) and right ear (RE)...
August 12, 2017: Brain Topography
https://www.readbyqxmd.com/read/28785973/white-matter-connectivity-pattern-associate-with-characteristics-of-scalp-eeg-signals
#20
Jinnan Gong, Cheng Luo, Xuebin Chang, Rui Zhang, Benjamin Klugah-Brown, Lanjin Guo, Peng Xu, Dezhong Yao
The rhythm of electroencephalogram (EEG) depends on the neuroanatomical-based parameters such as white matter (WM) connectivity. However, the impacts of these parameters on the specific characteristics of EEG have not been clearly understood. Previous studies demonstrated that, these parameters contribute the inter-subject differences of EEG during performance of specific task such as motor imagery (MI). Though researchers have worked on this phenomenon, the idea is yet to be understood in terms of the mechanism that underlies such differences...
August 7, 2017: Brain Topography
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