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Magnetoencephalography

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https://www.readbyqxmd.com/read/28928072/orbitofrontal-epilepsy-case-series-and-review-of-literature
#1
Imane Samah Chibane, Olivier Boucher, François Dubeau, Thi Phuoc Yen Tran, Ismail Mohamed, Richard McLachlan, R Mark Sadler, Richard Desbiens, Lionel Carmant, Dang Khoa Nguyen
BACKGROUND: Orbitofrontal epilepsy (OFE) is less known and is poorly characterized in comparison with temporal lobe epilepsy, partly because it is rare and possibly because it is unrecognized and therefore underestimated. OBJECTIVE: This paper aimed to better characterize seizure semiology, presurgical findings, and surgical outcomes in patients with OFE. METHODS: We retrospectively reviewed all confidently established OFE cases from six Canadian epilepsy monitoring units between 1988 and 2014, and in the literature between 1972 and 2017...
September 16, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28926474/parasympathetic-activation-enhanced-by-slow-respiration-modulates-early-auditory-sensory-gating
#2
Atsushi Aoyama, Yu Shimura, Takao Ohmuta, Yohei Nomoto, Masashi Kawasumi
Sensory gating is a preattentional mechanism to filter irrelevant information from the environment. It is typically reflected as a suppression of the event-related P50 component for successive sounds in the auditory modality. Although stress-induced sympathetic activation has been reported to disrupt P50 suppression, little is known about the modulatory effect of parasympathetic activation on early auditory sensory gating. We determined the parasympathetic effect on the magnetic P50 (P50m) suppression by controlling the respiratory rhythm and recording data simultaneously with magnetoencephalography and electrocardiography, using three successive click sounds as stimulus and ten normal individuals as study participants...
September 18, 2017: Neuroreport
https://www.readbyqxmd.com/read/28925734/a-pilot-treatment-study-for-mild-traumatic-brain-injury-neuroimaging-changes-detected-by-meg-after-low-intensity-pulse-based-transcranial-electrical-stimulation
#3
Ming-Xiong Huang, Ashley Robb Swan, Annemarie Angeles Quinto, Scott Matthews, Deborah L Harrington, Sharon Nichols, Barry J Bruder, Corey C Snook, Charles W Huang, Dewleen G Baker, Roland R Lee
BACKGROUND: Mild traumatic brain injury (mTBI) is a leading cause of sustained impairments in military service members, Veterans, and civilians. However, few treatments are available for mTBI, partially because the mechanism of persistent mTBI deficits is not fully understood. METHODS: We used magnetoencephalography (MEG) to investigate neuronal changes in individuals with mTBI following a passive neurofeedback-based treatment programme called IASIS. This programme involved applying low-intensity pulses using transcranial electrical stimulation (LIP-tES) with electroencephalography monitoring...
September 19, 2017: Brain Injury: [BI]
https://www.readbyqxmd.com/read/28920892/computationally-efficient-algorithms-for-sparse-dynamic-solutions-to-the-eeg-source-localization-problem
#4
Elvira Pirondini, Behtash Babadi, Gabriel Obregon-Henao, Camilo Lamus, Wasim Q Malik, Matti S Hamalainen, Patrick L Purdon
OBJECTIVE: Electroencephalography (EEG) and magnetoencephalography (MEG) non-invasively record scalp electromagnetic fields generated by cerebral currents, revealing millisecond-level brain dynamics useful for neuroscience and clinical applications. Estimating the currents that generate these fields, i.e., source localization, is an ill-conditioned inverse problem. Solutions to this problem have focused on spatial continuity constraints, dynamic modeling, or sparsity constraints. The combination of these key ideas could offer significant performance improvements, but substantial computational costs pose a challenge for practical application of such approaches...
September 14, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28917446/amplitude-modulation-rate-dependent-topographic-organization-of-the-auditory-steady-state-response-in-human-auditory-cortex
#5
Nathan Weisz, Chrysoula Lithari
Periodic modulations of an acoustic feature, such as amplitude over a certain frequency range, leads to phase locking of neural responses to the envelope of the modulation. Using electrophysiological methods this neural activity pattern, also called the auditory steady-state response (aSSR), is visible following frequency transformation of the evoked response as a clear spectral peak at the modulation frequency. Despite several studies employing the aSSR that show, for example, strongest responses for ∼40 Hz and an overall right-hemispheric dominance, it has not been investigated so far to what extent within auditory cortex different modulation frequencies elicit aSSRs at a homogenous source or whether the localization of the aSSR is topographically organized in a systematic manner...
September 11, 2017: Hearing Research
https://www.readbyqxmd.com/read/28913778/neural-basis-of-early-somatosensory-change-detection-a-magnetoencephalography-study
#6
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/28904983/structure-function-relationships-in-the-visual-system-in-multiple-sclerosis-an-meg-and-oct-study
#7
Prejaas Tewarie, Lisanne J Balk, Arjan Hillebrand, Martijn D Steenwijk, Bernard M J Uitdehaag, Cornelis J Stam, Axel Petzold
BACKGROUND: We conducted a multi-modal optical coherence tomography (OCT) and magnetoencephalography (MEG) study to test whether there is a relationship between retinal layer integrity and electrophysiological activity and connectivity (FC) in the visual network influenced by optic neuritis (ON) in patients with multiple sclerosis (MS). METHODS: One hundred and two MS patients were included in this MEG/OCT study. Retinal OCT data were collected from the optic discs, macular region, and segmented...
September 2017: Annals of Clinical and Translational Neurology
https://www.readbyqxmd.com/read/28900289/spatiotemporal-brain-dynamics-of-auditory-temporal-assimilation
#8
Naruhito Hironaga, Takako Mitsudo, Mariko Hayamizu, Yoshitaka Nakajima, Hiroshige Takeichi, Shozo Tobimatsu
Time is a fundamental dimension, but millisecond-level judgments sometimes lead to perceptual illusions. We previously introduced a "time-shrinking illusion" using a psychological paradigm that induces auditory temporal assimilation (ATA). In ATA, the duration of two successive intervals (T1 and T2), marked by three auditory stimuli, can be perceived as equal when they are not. Here, we investigate the spatiotemporal profile of human temporal judgments using magnetoencephalography (MEG). Behavioural results showed typical ATA: participants judged T1 and T2 as equal when T2 - T1 ≤ +80 ms...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28900010/prior-expectations-induce-prestimulus-sensory-templates
#9
Peter Kok, Pim Mostert, Floris P de Lange
Perception can be described as a process of inference, integrating bottom-up sensory inputs and top-down expectations. However, it is unclear how this process is neurally implemented. It has been proposed that expectations lead to prestimulus baseline increases in sensory neurons tuned to the expected stimulus, which in turn, affect the processing of subsequent stimuli. Recent fMRI studies have revealed stimulus-specific patterns of activation in sensory cortex as a result of expectation, but this method lacks the temporal resolution necessary to distinguish pre- from poststimulus processes...
September 12, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28899045/recent-advances-in-epilepsy-surgery-and-achieving-best-outcomes-using-high-frequency-oscillations-diffusion-tensor-imaging-magnetoencephalography-intraoperative-neuromonitoring-focal-cortical-dysplasia-and-bottom-of-sulcus-dysplasia
#10
https://www.readbyqxmd.com/read/28893608/adaptive-cortical-parcellations-for-source-reconstructed-eeg-meg-connectomes
#11
Seyedeh-Rezvan Farahibozorg, Richard N Henson, Olaf Hauk
There is growing interest in the rich temporal and spectral properties of the brain's functional connectome that are provided by Electro- and Magnetoencephalography (EEG/MEG). However, the problem of leakage between brain sources that arises when reconstructing brain activity from EEG/MEG recordings outside the head makes it difficult to distinguish true connections from spurious connections, even when connections are based on measures that ignore zero-lag dependencies. In particular, standard anatomical parcellations for potential cortical sources tend to over- or under-sample the real spatial resolution of EEG/MEG...
September 8, 2017: NeuroImage
https://www.readbyqxmd.com/read/28887898/beta-band-oscillations-during-passive-listening-to-metronome-sounds-reflect-improved-timing-representation-after-short-term-musical-training-in-healthy-older-adults
#12
Takako Fujioka, Bernhard Ross
Sub-second time intervals in musical rhythms provide predictive cues about future events to performers and listeners through an internalized representation of timing. While the acuity of automatic, sub-second timing as well as cognitively controlled, supra-second timing declines with aging, musical experts are less affected. The present study investigated the influence of piano training on temporal processing abilities in older adults using behavioural and neuronal correlates. We hypothesized that neuroplastic changes in beta networks, caused by training in sensorimotor coordination with timing processing, can be assessed even in the absence of movement...
September 9, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28886147/detection-of-atypical-network-development-patterns-in-children-with-autism-spectrum-disorder-using-magnetoencephalography
#13
Fang Duan, Katsumi Watanabe, Yuko Yoshimura, Mitsuru Kikuchi, Yoshio Minabe, Kazuyuki Aihara
Autism spectrum disorder (ASD) is a developmental disorder that involves developmental delays. It has been hypothesized that aberrant neural connectivity in ASD may cause atypical brain network development. Brain graphs not only describe the differences in brain networks between clinical and control groups, but also provide information about network development within each group. In the present study, graph indices of brain networks were estimated in children with ASD and in typically developing (TD) children using magnetoencephalography performed while the children viewed a cartoon video...
2017: PloS One
https://www.readbyqxmd.com/read/28884750/brain-imaging-tests-for-chronic-pain-medical-legal-and-ethical-issues-and-recommendations
#14
REVIEW
Karen D Davis, Herta Flor, Henry T Greely, Gian Domenico Iannetti, Sean Mackey, Markus Ploner, Amanda Pustilnik, Irene Tracey, Rolf-Detlef Treede, Tor D Wager
Chronic pain is the greatest source of disability globally and claims related to chronic pain feature in many insurance and medico-legal cases. Brain imaging (for example, functional MRI, PET, EEG and magnetoencephalography) is widely considered to have potential for diagnosis, prognostication, and prediction of treatment outcome in patients with chronic pain. In this Consensus Statement, a presidential task force of the International Association for the Study of Pain examines the capabilities of brain imaging in the diagnosis of chronic pain, and the ethical and legal implications of its use in this way...
September 8, 2017: Nature Reviews. Neurology
https://www.readbyqxmd.com/read/28879632/real-time-clustered-multiple-signal-classification-rtc-music
#15
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/28861339/spatio-temporal-source-cluster-analysis-reveals-fronto-temporal-auditory-change-processing-differences-within-a-shared-autistic-and-schizotypal-trait-phenotype
#16
Talitha C Ford, Will Woods, David P Crewther
Social Disorganisation (SD) is a shared autistic and schizotypal phenotype that is present in the subclinical population. Auditory processing deficits, particularly in mismatch negativity/field (MMN/F) have been reported across both spectrum disorders. This study investigates differences in MMN/F cortical spatio-temporal source activity between higher and lower quintiles of the SD spectrum. Sixteen low (9 female) and 19 high (9 female) SD subclinical adults (18-40years) underwent magnetoencephalography (MEG) during an MMF paradigm where standard tones (50ms) were interrupted by infrequent duration deviants (100ms)...
2017: NeuroImage: Clinical
https://www.readbyqxmd.com/read/28859565/neuroplasticity-and-the-brain-connectome-what-can-jean-talairach-s-reflections-bring-to-modern-psychosurgery
#17
Pierre Bourdillon, Caroline Apra, Marc Lévêque, Fabien Vinckier
Contrary to common psychosurgical practice in the 1950s, Dr. Jean Talairach had the intuition, based on clinical experience, that the brain connectome and neuroplasticity had a role to play in psychosurgery. Due to the remarkable progress of pharmacology at that time and to the technical limits of neurosurgery, these concepts were not put into practice. Currently, these concepts are being confirmed by modern techniques such as neuroimaging and computational neurosciences, and could pave the way for therapeutic innovation in psychiatry...
September 2017: Neurosurgical Focus
https://www.readbyqxmd.com/read/28852152/functional-and-effective-whole-brain-connectivity-using-magnetoencephalography-to-identify-monozygotic-twin-pairs
#18
M Demuru, A A Gouw, A Hillebrand, C J Stam, B W van Dijk, P Scheltens, B M Tijms, E Konijnenberg, M Ten Kate, A den Braber, D J A Smit, D I Boomsma, P J Visser
Resting-state functional connectivity patterns are highly stable over time within subjects. This suggests that such 'functional fingerprints' may have strong genetic component. We investigated whether the functional (FC) or effective (EC) connectivity patterns of one monozygotic twin could be used to identify the co-twin among a larger sample and determined the overlap in functional fingerprints within monozygotic (MZ) twin pairs using resting state magnetoencephalography (MEG). We included 32 cognitively normal MZ twin pairs from the Netherlands Twin Register who participate in the EMIF-AD preclinAD study (average age 68 years)...
August 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28844526/in%C3%A2-vivo-magnetic-recording-of-neuronal-activity
#19
Laure Caruso, Thomas Wunderle, Christopher Murphy Lewis, Joao Valadeiro, Vincent Trauchessec, Josué Trejo Rosillo, José Pedro Amaral, Jianguang Ni, Patrick Jendritza, Claude Fermon, Susana Cardoso, Paulo Peixeiro Freitas, Pascal Fries, Myriam Pannetier-Lecoeur
Neuronal activity generates ionic flows and thereby both magnetic fields and electric potential differences, i.e., voltages. Voltage measurements are widely used but suffer from isolating and smearing properties of tissue between source and sensor, are blind to ionic flow direction, and reflect the difference between two electrodes, complicating interpretation. Magnetic field measurements could overcome these limitations but have been essentially limited to magnetoencephalography (MEG), using centimeter-sized, helium-cooled extracranial sensors...
September 13, 2017: Neuron
https://www.readbyqxmd.com/read/28842260/latent-binocular-function-in-amblyopia
#20
Eva Chadnova, Alexandre Reynaud, Simon Clavagnier, Robert F Hess
Recently, psychophysical studies have shown that humans with amblyopia do have binocular function that is not normally revealed due to dominant suppressive interactions under normal viewing conditions. Here we use magnetoencephalography (MEG) combined with dichoptic visual stimulation to investigate the underlying binocular function in humans with amblyopia for stimuli that, because of their temporal properties, would be expected to bypass suppressive effects and to reveal any underlying binocular function...
August 31, 2017: Vision Research
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