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Brain Source Localization

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https://www.readbyqxmd.com/read/28073096/high-density-scalp-eeg-in-frontal-lobe-epilepsy
#1
Anteneh M Feyissa, Jeffrey W Britton, Jamie Van Gompel, Terrance L Lagerlund, Elson So, Lilly C Wong-Kisiel, Gregory C Cascino, Benjamin H Brinkman, Cindy L Nelson, Robert Watson, Gregory A Worrell
PURPOSE: Localization of seizures in frontal lobe epilepsy using the 10-20 system scalp EEG is often challenging because neocortical seizure can spread rapidly, significant muscle artifact, and the suboptimal spatial resolution for seizure generators involving mesial frontal lobe cortex. Our aim in this study was to determine the value of visual interpretation of 76 channel high density EEG (hdEEG) monitoring (10-10 system) in patients with suspected frontal lobe epilepsy, and to evaluate concordance with MRI, subtraction ictal SPECT co-registered to MRI (SISCOM), conventional EEG, and intracranial EEG (iEEG)...
January 2, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28061367/an-advanced-mri-and-mrsi-data-fusion-scheme-for-enhancing-unsupervised-brain-tumor-differentiation
#2
Yuqian Li, Xin Liu, Feng Wei, Diana M Sima, Sofie Van Cauter, Uwe Himmelreich, Yiming Pi, Guang Hu, Yi Yao, Sabine Van Huffel
Proton Magnetic Resonance Spectroscopic Imaging ((1)H MRSI) has shown great potential in tumor diagnosis since it provides localized biochemical information discriminating different tissue types, though it typically has low spatial resolution. Magnetic Resonance Imaging (MRI) is widely used in tumor diagnosis as an in vivo tool due to its high resolution and excellent soft tissue discrimination. This paper presents an advanced data fusion scheme for brain tumor diagnosis using both MRSI and MRI data to improve the tumor differentiation accuracy of MRSI alone...
December 27, 2016: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28058272/language-in-context-meg-evidence-for-modality-general-and-specific-responses-to-reference-resolution
#3
Christian Brodbeck, Laura Gwilliams, Liina Pylkkänen
Successful language comprehension critically depends on our ability to link linguistic expressions to the entities they refer to. Without reference resolution, newly encountered language cannot be related to previously acquired knowledge. The human experience includes many different types of referents, some visual, some auditory, some very abstract. Does the neural basis of reference resolution depend on the nature of the referents, or do our brains use a modality-general mechanism for linking meanings to referents? Here we report evidence for both...
November 2016: ENeuro
https://www.readbyqxmd.com/read/28048393/su-f-t-529-dosimetric-investigation-of-a-rotating-gamma-ray-system-for-imagedguided-modulated-arc-radiotherapy
#4
C Ma, O Chibani, A Eldib, J Li, L Chen
PURPOSE: Because of their effectiveness and efficiency, rotational arc radiotherapy (MAT) techniques have been developed on both specialty machines such as Tomotherapy and conventional linear accelerators. This work investigates a new rotating Gamma therapy system for image guided MAT and SBRT of intra/extracranial tumors. METHODS: The CyberMAT system (Cyber Medical Corp., China) consists of a ring gantry with a gamma source (effective source size 1cm and 1.7cm respectively), a 120-leaf MLC, a kV CBCT and an EPID...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28034790/technical-and-experimental-features-of-magnetic-resonance-spectroscopy-of-brain-glycogen-metabolism
#5
Ana Francisca Soares, Rolf Gruetter, Hongxia Lei
In the brain, glycogen is a source of glucose not only in emergency situations but also during normal brain activity. Altered brain glycogen metabolism is associated with energetic dysregulation in pathological conditions, such as diabetes or epilepsy. Both in humans and animals, brain glycogen levels have been assessed non-invasively by Carbon-13 Magnetic Resonance Spectroscopy ((13)C-MRS) in vivo. With this approach, glycogen synthesis and degradation may be followed in real time, thereby providing valuable insights into brain glycogen dynamics...
December 26, 2016: Analytical Biochemistry
https://www.readbyqxmd.com/read/28026755/passive-acoustic-mapping-with-the-angular-spectrum-method
#6
Costas Arvanitis, Calum Crake, Nathan McDannold, Gregory Clement
In the present proof of principle study, we evaluated the homogenous angular spectrum method for passive acoustic mapping (AS-PAM) of microbubble oscillations using simulated and experimental data. In the simulated data we assessed the ability of AS-PAM to form 3D maps of a single and multiple point sources. Then, in the two dimensional limit, we compared the 2D maps from AS-PAM with alternative frequency and time domain passive acoustic mapping (FD- and TD-PAM) approaches. Finally, we assessed the ability of AS-PAM to visualize microbubble activity in vivo with data obtained during 8 different experiments of FUS-induced blood-brain barrier disruption in 3 nonhuman primates, using a clinical MR-guided FUS system...
December 21, 2016: IEEE Transactions on Medical Imaging
https://www.readbyqxmd.com/read/28018180/local-field-potentials-myths-and-misunderstandings
#7
REVIEW
Oscar Herreras
The intracerebral local field potential (LFP) is a measure of brain activity that reflects the highly dynamic flow of information across neural networks. This is a composite signal that receives contributions from multiple neural sources, yet interpreting its nature and significance may be hindered by several confounding factors and technical limitations. By and large, the main factor defining the amplitude of LFPs is the geometry of the current sources, over and above the degree of synchronization or the properties of the media...
2016: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/28007515/measuring-meg-closer-to-the-brain-performance-of-on-scalp-sensor-arrays
#8
Joonas Iivanainen, Matti Stenroos, Lauri Parkkonen
Optically-pumped magnetometers (OPMs) have recently reached sensitivity levels required for magnetoencephalography (MEG). OPMs do not need cryogenics and can thus be placed within millimetres from the scalp into an array that adapts to the individual head size and shape, thereby reducing the distance from cortical sources to the sensors. Here, we quantified the improvement in recording MEG with hypothetical on-scalp OPM arrays compared to a 306-channel state-of-the-art SQUID array (102 magnetometers and 204 planar gradiometers)...
December 19, 2016: NeuroImage
https://www.readbyqxmd.com/read/27999537/nonlinear-coupling-between-cortical-oscillations-and-muscle-activity-during-isotonic-wrist-flexion
#9
Yuan Yang, Teodoro Solis-Escalante, Mark van de Ruit, Frans C T van der Helm, Alfred C Schouten
Coupling between cortical oscillations and muscle activity facilitates neuronal communication during motor control. The linear part of this coupling, known as corticomuscular coherence, has received substantial attention, even though neuronal communication underlying motor control has been demonstrated to be highly nonlinear. A full assessment of corticomuscular coupling, including the nonlinear part, is essential to understand the neuronal communication within the sensorimotor system. In this study, we applied the recently developed n:m coherence method to assess nonlinear corticomuscular coupling during isotonic wrist flexion...
2016: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/27991562/local-recording-of-biological-magnetic-fields-using-giant-magneto-resistance-based-micro-probes
#10
Francesca Barbieri, Vincent Trauchessec, Laure Caruso, Josué Trejo-Rosillo, Bartosz Telenczuk, Elodie Paul, Thierry Bal, Alain Destexhe, Claude Fermon, Myriam Pannetier-Lecoeur, Gilles Ouanounou
The electrical activity of brain, heart and skeletal muscles generates magnetic fields but these are recordable only macroscopically, such as in magnetoencephalography, which is used to map neuronal activity at the brain scale. At the local scale, magnetic fields recordings are still pending because of the lack of tools that can come in contact with living tissues. Here we present bio-compatible sensors based on Giant Magneto-Resistance (GMR) spin electronics. We show on a mouse muscle in vitro, using electrophysiology and computational modeling, that this technology permits simultaneous local recordings of the magnetic fields from action potentials...
December 19, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27989866/localization-and-expression-of-molt-inhibiting-hormone-and-nitric-oxide-synthase-in-the-central-nervous-system-of-the-green-shore-crab-carcinus-maenas-and-the-blackback-land-crab-gecarcinus-lateralis
#11
Natalie L Pitts, Donald L Mykles
In decapod crustaceans, molting is controlled by the pulsatile release of molt-inhibiting hormone (MIH) from neurosecretory cells in the X-organ/sinus gland (XO/SG) complex in the eyestalk ganglia (ESG). A drop in MIH release triggers molting by activating the molting gland or Y-organ (YO). Post-transcriptional mechanisms ultimately control MIH levels in the hemolymph. Neurotransmitter-mediated electrical activity controls Ca(2+)-dependent vesicular release of MIH from the SG axon terminals, which may be modulated by nitric oxide (NO)...
October 27, 2016: Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
https://www.readbyqxmd.com/read/27989433/complement-mediated-inflammation-and-injury-in-brain-dead-organ-donors
#12
Felix Poppelaars, Marc A Seelen
The importance of the complement system in renal ischemia-reperfusion injury and acute rejection is widely recognized, however its contribution to the pathogenesis of tissue damage in the donor remains underexposed. Brain-dead (BD) organ donors are still the primary source of organs for transplantation. Brain death is characterized by hemodynamic changes, hormonal dysregulation, and immunological activation. Recently, the complement system has been shown to be involved. In BD organ donors, complement is activated systemically and locally and is an important mediator of inflammation and graft injury...
December 15, 2016: Molecular Immunology
https://www.readbyqxmd.com/read/27988494/a-high-bandwidth-dual-channel-olfactory-stimulator-for-studying-temporal-sensitivity-of-olfactory-processing
#13
Georg Raiser, C Giovanni Galizia, Paul Szyszka
Animals encounter fine-scale temporal patterns of odorant mixtures that contain information about the distance and number of odorant sources. To study the role of such temporal cues for odorant detection and source localization, one needs odorant delivery devices that are capable of mimicking the temporal stimulus statistics of natural odor plumes. However, current odorant delivery devices either lack temporal resolution or are limited to a single odorant channel. Here, we present an olfactory stimulator that features precise control of high-bandwidth stimulus dynamics, which allows generating arbitrary fluctuating binary odorant mixtures...
December 17, 2016: Chemical Senses
https://www.readbyqxmd.com/read/27986607/spatio-temporal-reconstruction-of-brain-dynamics-from-eeg-with-a-markov-prior
#14
Sofie Therese Hansen, Lars Kai Hansen
Electroencephalography (EEG) can capture brain dynamics in high temporal resolution. By projecting the scalp EEG signal back to its origin in the brain also high spatial resolution can be achieved. Source localized EEG therefore has potential to be a very powerful tool for understanding the functional dynamics of the brain. Solving the inverse problem of EEG is however highly ill-posed as there are many more potential locations of the EEG generators than EEG measurement points. Several well-known properties of brain dynamics can be exploited to alleviate this problem...
December 13, 2016: NeuroImage
https://www.readbyqxmd.com/read/27980112/cortical-correlates-of-the-auditory-frequency-following-and-onset-responses-eeg-and-fmri-evidence
#15
Emily B J Coffey, Gabriella Musacchia, Robert J Zatorre
: The frequency following response (FFR) is a measure of the brain's periodic sound encoding. It is of increasing importance for studying the human auditory nervous system due to numerous associations with auditory cognition and dysfunction. Although the FFR is widely interpreted as originating from brainstem nuclei, a recent study using magnetoencephalography (MEG) suggested that there is also a right-lateralized contribution from the auditory cortex at the fundamental frequency (Coffey et al...
December 15, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27965529/s-smooth-sparsity-and-smoothness-enhanced-eeg-brain-tomography
#16
Ying Li, Jing Qin, Yue-Loong Hsin, Stanley Osher, Wentai Liu
EEG source imaging enables us to reconstruct current density in the brain from the electrical measurements with excellent temporal resolution (~ ms). The corresponding EEG inverse problem is an ill-posed one that has infinitely many solutions. This is due to the fact that the number of EEG sensors is usually much smaller than that of the potential dipole locations, as well as noise contamination in the recorded signals. To obtain a unique solution, regularizations can be incorporated to impose additional constraints on the solution...
2016: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/27938488/a-subpopulation-of-dopaminergic-neurons-co-expresses-serotonin-in-ventral-mesencephalic-cultures-but-not-after-intrastriatal-transplantation-in-a-rat-model-of-parkinsons-disease
#17
Stefano Di Santo, Stefanie Seiler, Angélique Ducray, Morten Meyer, Hans Widmer
Cell replacement therapy is a promising avenue into the investigation and treatment of Parkinson’s disease (PD) and in some cases significant long-term motor improvements have been demonstrated. The main source of donor tissue is the human fetal ventral mesencephalon (VM), which consists of a mixed neuronal population and its heterogeneity likely contributes to the inconsistent outcome observed in clinical trials. Detailed knowledge about the neuronal subpopulations in the VM seems, hence, essential for successful cell transplantation...
7, 2016: Cell Transplantation
https://www.readbyqxmd.com/read/27936219/combined-emd-sloreta-analysis-of-eeg-data-collected-during-a-contour-integration-task
#18
Karema Al-Subari, Saad Al-Baddai, Ana Maria Tomé, Gregor Volberg, Bernd Ludwig, Elmar W Lang
Lately, Ensemble Empirical Mode Decomposition (EEMD) techniques receive growing interest in biomedical data analysis. Event-Related Modes (ERMs) represent features extracted by an EEMD from electroencephalographic (EEG) recordings. We present a new approach for source localization of EEG data based on combining ERMs with inverse models. As the first step, 64 channel EEG recordings are pooled according to six brain areas and decomposed, by applying an EEMD, into their underlying ERMs. Then, based upon the problem at hand, the most closely related ERM, in terms of frequency and amplitude, is combined with inverse modeling techniques for source localization...
2016: PloS One
https://www.readbyqxmd.com/read/27932956/hypothalamic-vasopressinergic-projections-innervate-central-amygdala-gabaergic-neurons-implications-for-anxiety-and-stress-coping
#19
Vito S Hernández, Oscar R Hernández, Miguel Perez de la Mora, María J Gómora, Kjell Fuxe, Lee E Eiden, Limei Zhang
The arginine-vasopressin (AVP)-containing hypothalamic magnocellular neurosecretory neurons (VPMNNs) are known for their role in hydro-electrolytic balance control via their projections to the neurohypophysis. Recently, projections from these same neurons to hippocampus, habenula and other brain regions in which vasopressin infusion modulates contingent social and emotionally-affected behaviors, have been reported. Here, we present evidence that VPMNN collaterals also project to the amygdaloid complex, and establish synaptic connections with neurons in central amygdala (CeA)...
2016: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/27932094/non-heart-beating-donor-kidney-transplantation-survival-is-similar-to-donation-after-brain-death-comparative-study-with-controls-in-a-regional-program
#20
M A Gentil, P Castro de la Nuez, C Gonzalez-Corvillo, M C de Gracia, M Cabello, M A Mazuecos, A Rodriguez-Benot, L Ballesteros, A Osuna, M Alonso
Non-heart-beating donors (NHBD) are an increasing source of organs for kidney transplantation (KT) compared with donation after brain death (DBD), but the results in each regional transplantation program require local analysis. We compared 164 KT from NHBD (83 Maastrich type II A-B [T2] and 81 type III [T3]) with 328 DBD controls. NHBD kidneys were implanted with less cold ischemia, mean time on renal replacement therapy for NHBD recipients before transplantation was less too, and a higher proportion of thymoglobulin was also used...
November 2016: Transplantation Proceedings
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