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Magnetoencephalography

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https://www.readbyqxmd.com/read/29331287/characterizing-the-effects-of-deep-brain-stimulation-with-magnetoencephalography-a-review
#1
REVIEW
Irene E Harmsen, Nathan C Rowland, Richard A Wennberg, Andres M Lozano
BACKGROUND: Deep brain stimulation (DBS) is an important form of neuromodulation that is being applied to patients with motor, mood, or cognitive circuit disorders. Despite the efficacy and widespread use of DBS, the precise mechanisms by which it works remain unknown. Over the last decade, magnetoencephalography (MEG) has become an important functional neuroimaging technique used to study DBS. OBJECTIVE: This review summarizes the literature related to the use of MEG to characterize the effects of DBS...
January 4, 2018: Brain Stimulation
https://www.readbyqxmd.com/read/29330134/a-supplementary-functional-connectivity-microstate-attached-to-the-default-mode-network-in-depression-revealed-by-resting-state-magnetoencephalography
#2
Siqi Zhang, Shui Tian, Mohammad Ridwan Chattun, Hao Tang, Rui Yan, Kun Bi, Zhijian Yao, Qing Lu
Default mode network (DMN) has discernable involvement in the representation of negative, self-referential information in depression. Both increased and decreased resting-state functional connectivity between the anterior and posterior DMN have been observed in depression. These conflicting connectivity differences necessitated further exploration of the resting-state DMN dysfunction in depression. Hence, we investigated the time-varying dynamic interactions within the DMN via functional connectivity microstates in a sub-second level...
January 9, 2018: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/29319611/comparison-of-somatosensory-cortex-excitability-between-migraine-and-strict-criteria-tension-type-headache-a-magnetoencephalographic-study
#3
Wei-Ta Chen, Fu-Jung Hsiao, Yu-Chieh Ko, Hung-Yu Liu, Pei-Ning Wang, Jong-Ling Fuh, Yung-Yang Lin, Shuu-Jiun Wang
Tension-type headache (TTH) and migraine are both common types of headaches. Despite distinct symptoms, TTH and migraine are highly comorbid and exhibit many clinical similarities. This study enrolled consecutive patients with TTH and age- and sex-matched patients with migraine and healthy controls to investigate whether TTH and migraine are similar in brain excitability change assessed by magnetoencephalography. Patients with TTH were excluded if they reported any headache features or associated symptoms of migraine...
January 9, 2018: Pain
https://www.readbyqxmd.com/read/29316987/diet-nutrition-and-the-ageing-brain-current-evidence-and-new-directions
#4
Katie Moore, Catherine F Hughes, Mary Ward, Leane Hoey, Helene McNulty
Globally populations are ageing. By 2050, it is estimated that there will be two billion people aged 60 years or over, of which 131 million are projected to be affected by dementia, while depression is predicted to be the second leading cause of disability worldwide by 2020. Preventing or delaying the onset of these disorders should therefore be a public health priority. There is some evidence linking certain dietary patterns, particularly the Mediterranean diet, with a reduced risk of dementia and depression...
January 10, 2018: Proceedings of the Nutrition Society
https://www.readbyqxmd.com/read/29311143/neural-integration-of-stimulus-history-underlies-prediction-for-naturalistically-evolving-sequences
#5
Brian Maniscalco, Jennifer L Lee, Patrice Abry, Amy Lin, Tom Holroyd, Biyu J He
Forming valid predictions about the environment is crucial to survival. However, whether humans are able to form valid predictions about natural stimuli based on their temporal statistical regularities remains unknown. Here we presented subjects with tone sequences whose pitch fluctuation over time capture long-range temporal dependence structures prevalent in natural stimuli. We found that subjects were able to exploit such naturalistic statistical regularities to make valid predictions about upcoming items in a sequence...
January 8, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29309826/veterans-with-ptsd-demonstrate-amygdala-hyperactivity-while-viewing-threatening-faces-a-meg-study
#6
Amy Badura-Brack, Timothy J McDermott, Elizabeth Heinrichs-Graham, Tara J Ryan, Maya M Khanna, Daniel S Pine, Yair Bar-Haim, Tony W Wilson
Posttraumatic stress disorder (PTSD) is a major psychiatric disorder that is prevalent in combat veterans. Previous neuroimaging studies have found elevated amygdala activity in PTSD in response to threatening stimuli, but previous work has lacked the temporal specificity to study fast bottom-up fear responses involving the amygdala. Forty-four combat veterans, 28 with PTSD and 16 without, completed psychological testing and then a face-processing task during magnetoencephalography (MEG). The resulting MEG data were pre-processed, transformed into the time-frequency domain, and then imaged using a beamforming approach...
January 5, 2018: Biological Psychology
https://www.readbyqxmd.com/read/29288902/diagnostic-evaluation-and-surgical-management-of-pediatric-insular-epilepsy-utilizing-magnetoencephalography-and-invasive-eeg-monitoring
#7
Raheel Ahmed, Hiroshi Otsubo, Carter Snead, Elizabeth Donner, Elysa Widjaja, Ayako Ochi, James M Drake, James T Rutka
INTRODUCTION: The diagnosis and surgical management of pediatric patients with insular epilepsy is challenging due to variable and indistinct seizure semiology arising within the insular cortex. In addition, surgical approaches are associated with potential morbidity given the regional neurosurgical and vascular anatomy. Our institutional experience in evaluation and surgical management of insular epilepsy patients is presented. Diagnostic evaluation, surgical treatment and seizures outcomes are highlighted...
December 20, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/29288869/human-in-vivo-brain-magnetic-resonance-current-density-imaging-mrcdi
#8
Cihan Göksu, Lars G Hanson, Hartwig R Siebner, Philipp Ehses, Klaus Scheffler, Axel Thielscher
Magnetic resonance current density imaging (MRCDI) and MR electrical impedance tomography (MREIT) are two emerging modalities, which combine weak time-varying currents injected via surface electrodes with magnetic resonance imaging (MRI) to acquire information about the current flow and ohmic conductivity distribution at high spatial resolution. The injected current flow creates a magnetic field in the head, and the component of the induced magnetic field ΔBz,c parallel to the main scanner field causes small shifts in the precession frequency of the magnetization...
December 27, 2017: NeuroImage
https://www.readbyqxmd.com/read/29283465/delta-but-not-theta-band-cortical-entrainment-involves-speech-specific-processing
#9
Nicola Molinaro, Mikel Lizarazu
Cortical oscillations phase-align to the quasi-rhythmic structure of the speech envelope. This speech-brain entrainment has been reported in two frequency bands, i.e., both in the theta band (4 - 8 Hz) and in the delta band (< 4 Hz). However, it is not clear if these two phenomena reflect passive synchronization of the auditory cortex to the acoustics of the speech input, or if they reflect higher processes involved in actively parsing speech information. Here we report two magnetoencephalography experiments in which we contrasted cortical entrainment to natural speech compared to qualitative different control conditions (Experiment 1: amplitude modulated white-noise; Experiment 2: spectrally rotated speech)...
December 28, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29251830/patterns-of-altered-neural-synchrony-in-the-default-mode-network-in-autism-spectrum-disorder-revealed-with-magnetoencephalography-meg-relationship-to-clinical-symptomatology
#10
Renée Lajiness-O'Neill, Jonathan R Brennan, John E Moran, Annette E Richard, Ana-Mercedes Flores, Casey Swick, Ryan Goodcase, Tiffany Andersen, Kaitlyn McFarlane, Kenneth Rusiniak, Ioulia Kovelman, Neelima Wagley, Maggie Ugolini, Jeremy Albright, Susan M Bowyer
Disrupted neural synchrony may be a primary electrophysiological abnormality in autism spectrum disorders (ASD), altering communication between discrete brain regions and contributing to abnormalities in patterns of connectivity within identified neural networks. Studies exploring brain dynamics to comprehensively characterize and link connectivity to large-scale cortical networks and clinical symptoms are lagging considerably. Patterns of neural coherence within the Default Mode Network (DMN) and Salience Network (SN) during resting state were investigated in 12 children with ASD (MAge  = 9...
December 18, 2017: Autism Research: Official Journal of the International Society for Autism Research
https://www.readbyqxmd.com/read/29247880/entrainment-for-attentional-selection-in-parkinson-s-disease
#11
Erik S Te Woerd, Robert Oostenveld, Floris P de Lange, Peter Praamstra
Neural entrainment plays a crucial role in perception and action, especially when stimuli possess a certain temporal regularity, and is also suggested to serve as a neural process to select and attend the relevant stream in situations where there are competing stimulus streams. Beneficial effects of entrainment have led to the suggestion that rhythmic stimuli can improve motor function in patients with Parkinson's disease (PD). Behavioural studies support this suggestion, but neurophysiological studies have shown reduced entrainment of motor areas in PD...
November 26, 2017: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29247177/frequency-specific-genetic-influence-on-inferior-parietal-lobule-activation-commonly-observed-during-action-observation-and-execution
#12
Toshihiko Araki, Mai Onishi, Takufumi Yanagisawa, Masayuki Hirata, Yoshiyuki Watanabe, Soshiro Ogata, Kazuo Hayakawa, Chika Honda, Mikio Watanabe, Yoshinori Iwatani, Shiro Yorifuji
Brain activity relating to recognition of action varies among subjects. These differences have been hypothesised to originate from genetic and environmental factors although the extent of their effect remains unclear. Effects of these factors on brain activity during action recognition were evaluated by comparing magnetoencephalography (MEG) signals in twins. MEG signals of 20 pairs of elderly monozygotic twins and 11 pairs of elderly dizygotic twins were recorded while they observed finger movements and copied them...
December 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29245083/concordance-between-the-wada-test-and-neuroimaging-lateralization-influence-of-imaging-modality-fmri-and-meg-and-patient-experience
#13
Steven Kemp, Garreth Prendergast, Theodoros Karapanagiotidis, Gus Baker, Thomas P Kelly, Tufail Patankar, Simon S Keller
The Wada test remains the traditional test for lateralizing language and memory function prior to epilepsy surgery. Functional imaging, particularly functional MRI (fMRI), has made progress in the language domain, but less so in the memory domain. Magnetoencephalography (MEG) has received less research attention, but shows promise, particularly for language lateralization. We recruited a consecutive sample of 19 patients with epilepsy who had completed presurgical work-up, including the Wada test, and compared fMRI (memory) and MEG (language and memory) with Wada test results...
December 12, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29244637/u-shaped-relation-between-prestimulus-alpha-and-poststimulus-gamma-band-power-in-temporal-tactile-perception-in-the-human-somatosensory-cortex
#14
Marc André Wittenberg, Thomas J Baumgarten, Alfons Schnitzler, Joachim Lange
Neuronal oscillations are a ubiquitous phenomenon in the human nervous system. Alpha-band oscillations (8-12 Hz) have been shown to correlate negatively with attention and performance, whereas gamma-band oscillations (40-150 Hz) correlate positively. Here, we studied the relation between prestimulus alpha-band power and poststimulus gamma-band power in a suprathreshold tactile discrimination task. Participants received two electrical stimuli to their left index finger with different SOAs (0 msec, 100 msec, intermediate SOA, intermediate SOA ± 10 msec)...
December 15, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/29235479/dynamic-cortical-representations-of-perceptual-filling-in-for-missing-acoustic-rhythm
#15
Francisco Cervantes Constantino, Jonathan Z Simon
In the phenomenon of perceptual filling-in, missing sensory information can be reconstructed via interpolation or extrapolation from adjacent contextual cues by what is necessarily an endogenous, not yet well understood, neural process. In this investigation, sound stimuli were chosen to allow observation of fixed cortical oscillations driven by contextual (but missing) sensory input, thus entirely reflecting endogenous neural activity. The stimulus employed was a 5 Hz frequency-modulated tone, with brief masker probes (noise bursts) occasionally added...
December 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29232569/source-analysis-of-epileptiform-discharges-in-absence-epilepsy-using-magnetoencephalography-meg
#16
Veeranna Gadad, Sanjib Sinha, Narayanan Mariyappa, Jayabal Velmurugan, G Chaitanya, Jitender Saini, Kandivel Thennarasu, Parthasarathy Satishchandra
PURPOSE: Magnetoencephalography (MEG) was used to record and localize the sources of the epileptiform discharges, in absence epilepsy, at three different time intervals to infer the sources of involvement during generation and propagation. METHODS: Twenty patients with absence epilepsy (M:F=1:1; age: 10.2±3.4years), which included 12 patients with childhood absence epilepsy (CAE) and 8 patients with juvenile absence epilepsy (JAE), were recruited in this prospective MEG based study...
December 5, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/29225563/music-evoked-emotions-current-studies
#17
REVIEW
Hans-Eckhardt Schaefer
The present study is focused on a review of the current state of investigating music-evoked emotions experimentally, theoretically and with respect to their therapeutic potentials. After a concise historical overview and a schematic of the hearing mechanisms, experimental studies on music listeners and on music performers are discussed, starting with the presentation of characteristic musical stimuli and the basic features of tomographic imaging of emotional activation in the brain, such as functional magnetic resonance imaging (fMRI) and positron emission tomography (PET), which offer high spatial resolution in the millimeter range...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29217685/scale-free-amplitude-modulation-of-neuronal-oscillations-tracks-comprehension-of-accelerated-speech
#18
Ana Filipa Teixeira Borges, Anne-Lise Giraud, Huibert D Mansvelder, Klaus Linkenkaer-Hansen
Speech comprehension is preserved up to a three-fold acceleration but rapidly deteriorates at higher speeds. Current models posit that perceptual resilience to accelerated speech is limited by the brain's ability to parse speech into syllabic units using delta/theta oscillations. Here, we ask whether the involvement of neuronal oscillations in processing accelerated speech also relates to their scale-free amplitude modulation as indexed by the strength of long-range temporal correlations (LRTC). We recorded magnetoencephalography (MEG) while 24 human subjects (12 females) listened to radio news uttered at different comprehensible rates, at a mostly unintelligible rate, and at this same speed interleaved with silence gaps...
December 6, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29215027/altered-human-voice-processing-in-the-frontal-cortex-and-a-developmental-language-delay-in-3-to-5-year-old-children-with-autism-spectrum-disorder
#19
Yuko Yoshimura, Mitsuru Kikuchi, Norio Hayashi, Hirotoshi Hiraishi, Chiaki Hasegawa, Tetsuya Takahashi, Manabu Oi, Gerard B Remijn, Takashi Ikeda, Daisuke N Saito, Hirokazu Kumazaki, Yoshio Minabe
The inferior frontal and superior temporal areas in the left hemisphere are crucial for human language processing. In the present study, we investigated the magnetic mismatch field (MMF) evoked by voice stimuli in 3- to 5-year-old typically developing (TD) children and children with autism spectrum disorder (ASD) using child-customized magnetoencephalography (MEG). The children with ASD exhibited significantly decreased activation in the left superior temporal gyrus compared with the TD children for the MMF amplitude...
December 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29209157/the-effect-of-head-model-simplification-on-beamformer-source-localization
#20
Frank Neugebauer, Gabriel Möddel, Stefan Rampp, Martin Burger, Carsten H Wolters
Beamformers are a widely-used tool in brain analysis with magnetoencephalography (MEG) and electroencephalography (EEG). For the construction of the beamformer filters realistic head volume conductor modeling is necessary for accurately computing the EEG and MEG leadfields, i.e., for solving the EEG and MEG forward problem. In this work, we investigate the influence of including realistic head tissue compartments into a finite element method (FEM) model on the beamformer's localization ability. Specifically, we investigate the effect of including cerebrospinal fluid, gray matter, and white matter distinction, as well as segmenting the skull bone into compacta and spongiosa, and modeling white matter anisotropy...
2017: Frontiers in Neuroscience
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