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Magnetoencephalography

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https://www.readbyqxmd.com/read/28080963/is-the-cardiac-monitoring-function-related-to-the-self-in-both-the-default-network-and-right-anterior-insula
#1
Mariana Babo-Rebelo, Nicolai Wolpert, Claude Adam, Dominique Hasboun, Catherine Tallon-Baudry
The self has been proposed to be rooted in the neural monitoring of internal bodily signals and might thus involve interoceptive areas, notably the right anterior insula (rAI). However, studies on the self consistently showed the involvement of midline default network (DN) nodes, without referring to visceral monitoring. Here, we investigate this apparent discrepancy. We previously showed that neural responses to heartbeats in the DN encode two different self-dimensions, the agentive 'I' and the introspective 'Me', in a whole-brain analysis of magnetoencephalography (MEG) data...
November 19, 2016: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28077711/phase-amplitude-coupling-and-long-range-phase-synchronization-reveal-frontotemporal-interactions-during-visual-working-memory
#2
Jonathan Daume, Thomas Gruber, Andreas K Engel, Uwe Friese
: It has been suggested that cross-frequency phase-amplitude coupling (PAC), particularly in temporal brain structures, serves as a neural mechanism for coordinated working memory storage. In this magnetoencephalography study, we show that during visual working memory maintenance, temporal cortex regions, which exhibit enhanced PAC, interact with prefrontal cortex via enhanced low-frequency phase synchronization. Healthy human participants were engaged in a visual delayed match-to-sample task with pictures of natural objects...
January 11, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28076421/oscillatory-dynamics-supporting-semantic-cognition-meg-evidence-for-the-contribution-of-the-anterior-temporal-lobe-hub-and-modality-specific-spokes
#3
Giovanna Mollo, Piers L Cornelissen, Rebecca E Millman, Andrew W Ellis, Elizabeth Jefferies
The "hub and spoke model" of semantic representation suggests that the multimodal features of objects are drawn together by an anterior temporal lobe (ATL) "hub", while modality-specific "spokes" capture perceptual/action features. However, relatively little is known about how these components are recruited through time to support object identification. We used magnetoencephalography to measure neural oscillations within left ATL, lateral fusiform cortex (FC) and central sulcus (CS) during word-picture matching at different levels of specificity (employing superordinate vs...
2017: PloS One
https://www.readbyqxmd.com/read/28067149/navigation-assisted-trans-inferotemporal-cortex-selective-amygdalohippocampectomy-for-mesial-temporal-lobe-epilepsy-preserving-the-temporal-stem
#4
Haruhiko Kishima, Amami Kato, Satoru Oshino, Naoki Tani, Tomoyuki Maruo, Hui Ming Khoo, Takufumi Yanagisawa, Kotaro Edakawa, Maki Kobayashi, Masataka Tanaka, Koichi Hosomi, Masayuki Hirata, Toshiki Yoshimine
OBJECTIVE: Selective amygdalohippocampectomy (SAH) can be used to obtain satisfactory seizure control in patients with mesial temporal lobe epilepsy (MTLE). Several SAH procedures have been reported to achieve satisfactory outcomes for seizure control, but none yield fully satisfactory outcomes for memory function. We hypothesized that preserving the temporal stem might play an important role. To preserve the temporal stem, we developed a minimally invasive surgical procedure, 'neuronavigation-assisted trans-inferotemporal cortex SAH' (TITC-SAH)...
January 9, 2017: Neurological Research
https://www.readbyqxmd.com/read/28060325/interictal-high-frequency-oscillations-detected-with-simultaneous-magnetoencephalography-and-electroencephalography-as-biomarker-of-pediatric-epilepsy
#5
Christos Papadelis, Eleonora Tamilia, Steven Stufflebeam, Patricia E Grant, Joseph R Madsen, Phillip L Pearl, Naoaki Tanaka
Crucial to the success of epilepsy surgery is the availability of a robust biomarker that identifies the Epileptogenic Zone (EZ). High Frequency Oscillations (HFOs) have emerged as potential presurgical biomarkers for the identification of the EZ in addition to Interictal Epileptiform Discharges (IEDs) and ictal activity. Although they are promising to localize the EZ, they are not yet suited for the diagnosis or monitoring of epilepsy in clinical practice. Primary barriers remain: the lack of a formal and global definition for HFOs; the consequent heterogeneity of methodological approaches used for their study; and the practical difficulties to detect and localize them noninvasively from scalp recordings...
December 6, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28059855/american-clinical-meg-society-acmegs-position-statement-2-the-value-of-magnetoencephalography-meg-magnetic-source-imaging-msi-in-noninvasive-presurgical-mapping-of-eloquent-cortices-of-patients-preparing-for-surgical-interventions
#6
Anto I Bagić, Susan M Bowyer, Heidi E Kirsch, Michael E Funke, Richard C Burgess
No abstract text is available yet for this article.
January 5, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28058272/language-in-context-meg-evidence-for-modality-general-and-specific-responses-to-reference-resolution
#7
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/28054328/magnetoencephalography-and-new-imaging-modalities-in-epilepsy
#8
REVIEW
Jessica Falco-Walter, Christian Owen, Mishu Sharma, Christopher Reggi, Mandy Yu, Travis R Stoub, Michael A Stein
The success of epilepsy surgery is highly dependent on correctly identifying the entire epileptogenic region. Current state-of-the-art for localizing the extent of surgically amenable areas involves combining high resolution three-dimensional magnetic resonance imaging (MRI) with electroencephalography (EEG) and magnetoencephalography (MEG) source modeling of interictal epileptiform activity. Coupling these techniques with newer quantitative structural MRI techniques, such as cortical thickness measurements, however, may improve the extent to which the abnormal epileptogenic region can be visualized...
January 4, 2017: Neurotherapeutics: the Journal of the American Society for Experimental NeuroTherapeutics
https://www.readbyqxmd.com/read/28053240/broadened-population-level-frequency-tuning-in-the-auditory-cortex-of-tinnitus-patients
#9
Kenichi Sekiya, Mariko Takahashi, Shingo Murakami, Ryusuke Kakigi, Hidehiko Okamoto
Tinnitus is a phantom auditory perception without an external sound source and is one of the most common public health concerns that impair the quality of life of many individuals. However, its neural mechanisms remain unclear. We herein examined population-level frequency tuning in the auditory cortex of unilateral tinnitus patients with similar hearing levels in both ears using magnetoencephalography. We compared auditory evoked neural activities elicited by a stimulation to the tinnitus and non-tinnitus ears...
January 4, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28044019/resolving-the-neural-dynamics-of-visual-and-auditory-scene-processing-in-the-human-brain-a-methodological-approach
#10
REVIEW
Radoslaw Martin Cichy, Santani Teng
In natural environments, visual and auditory stimulation elicit responses across a large set of brain regions in a fraction of a second, yielding representations of the multimodal scene and its properties. The rapid and complex neural dynamics underlying visual and auditory information processing pose major challenges to human cognitive neuroscience. Brain signals measured non-invasively are inherently noisy, the format of neural representations is unknown, and transformations between representations are complex and often nonlinear...
February 19, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28043064/electrophysiological-resting-state-biomarker-for-diagnosing-mesial-temporal-lobe-epilepsy-with-hippocampal-sclerosis
#11
Seung-Hyun Jin, Chun Kee Chung
The main aim of the present study was to evaluate whether resting-state functional connectivity of magnetoencephalography (MEG) signals can differentiate patients with mesial temporal lobe epilepsy (MTLE) from healthy controls (HC) and can differentiate between right and left MTLE as a diagnostic biomarker. To this end, a support vector machine (SVM) method among various machine learning algorithms was employed. We compared resting-state functional networks between 46 MTLE (right MTLE=23; left MTLE=23) patients with histologically proven HS who were free of seizure after surgery, and 46 HC...
November 23, 2016: Epilepsy Research
https://www.readbyqxmd.com/read/28042984/transcranial-direct-current-stimulation-modulates-offline-visual-oscillatory-activity-a-magnetoencephalography-study
#12
Elizabeth Heinrichs-Graham, Timothy J McDermott, Mackenzie S Mills, Nathan M Coolidge, Tony W Wilson
Transcranial direct-current stimulation (tDCS) is a noninvasive neuromodulatory method that involves delivering low amplitude, direct current to specific regions of the brain. While a wealth of literature shows changes in behavior and cognition following tDCS administration, the underlying neuronal mechanisms remain largely unknown. Neuroimaging studies have generally used fMRI and shown only limited consensus to date, while the few electrophysiological studies have reported mostly null or counterintuitive findings...
December 7, 2016: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/28030631/impact-of-audio-visual-asynchrony-on-lip-reading-effects-neuromagnetic-and-psychophysical-study
#13
Tetsuaki Kawase, Izumi Yahata, Akitake Kanno, Shuichi Sakamoto, Yoshitaka Takanashi, Shiho Takata, Nobukazu Nakasato, Ryuta Kawashima, Yukio Katori
The effects of asynchrony between audio and visual (A/V) stimuli on the N100m responses of magnetoencephalography in the left hemisphere were compared with those on the psychophysical responses in 11 participants. The latency and amplitude of N100m were significantly shortened and reduced in the left hemisphere by the presentation of visual speech as long as the temporal asynchrony between A/V stimuli was within 100 ms, but were not significantly affected with audio lags of -500 and +500 ms. However, some small effects were still preserved on average with audio lags of 500 ms, suggesting similar asymmetry of the temporal window to that observed in psychophysical measurements, which tended to be more robust (wider) for audio lags; i...
2016: PloS One
https://www.readbyqxmd.com/read/28029717/time-course-of-gamma-band-oscillation-associated-with-face-processing-in-the-inferior-occipital-gyrus-and-fusiform-gyrus-a-combined-fmri-and-meg-study
#14
Shota Uono, Wataru Sato, Takanori Kochiyama, Yasutaka Kubota, Reiko Sawada, Sayaka Yoshimura, Motomi Toichi
Debate continues over whether the inferior occipital gyrus (IOG) or the fusiform gyrus (FG) represents the first stage of face processing and what role these brain regions play. We investigated this issue by combining functional magnetic resonance imaging (fMRI) and magnetoencephalography (MEG) in normal adults. Participants passively observed upright and inverted faces and houses. First, we identified the IOG and FG as face-specific regions using fMRI. We applied beamforming source reconstruction and time-frequency analysis to MEG source signals to reveal the time course of gamma-band activations in these regions...
December 28, 2016: Human Brain Mapping
https://www.readbyqxmd.com/read/28028220/spatiotemporal-dynamics-of-similarity-based-neural-representations-of-facial-identity
#15
Mark D Vida, Adrian Nestor, David C Plaut, Marlene Behrmann
Humans' remarkable ability to quickly and accurately discriminate among thousands of highly similar complex objects demands rapid and precise neural computations. To elucidate the process by which this is achieved, we used magnetoencephalography to measure spatiotemporal patterns of neural activity with high temporal resolution during visual discrimination among a large and carefully controlled set of faces. We also compared these neural data to lower level "image-based" and higher level "identity-based" model-based representations of our stimuli and to behavioral similarity judgments of our stimuli...
December 27, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28028201/decoding-the-cortical-dynamics-of-sound-meaning-mapping
#16
Ece Kocagoncu, Alex Clarke, Barry Devereux, Lorraine K Tyler
: Comprehending speech involves the rapid and optimally efficient mapping from sound to meaning. Influential cognitive models of spoken word recognition (Marslen-Wilson and Welsh, 1978) propose that the onset of a spoken word initiates a continuous process of activation of the lexical and semantic properties of the word candidates matching the speech input, and competition between them which continues until the point at which the word is differentiated from all other cohort candidates (the uniqueness point, UP)...
December 27, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28027909/how-do-we-keep-information-online
#17
David Soto
New magnetoencephalography (MEG) results indicate that a putative marker of conscious processes - namely, the global broadcasting of information across large-scale cortical networks - can also operate during the maintenance of non-conscious input. I discuss the implications for the theoretical linkage between conscious awareness and working memory functions.
December 24, 2016: Trends in Cognitive Sciences
https://www.readbyqxmd.com/read/28009677/effectiveness-of-temporary-deafferentation-of-the-arm-on-somatosensory-and-motor-functions-following-stroke-a-systematic-review
#18
Emmanuelle Opsommer, Camille Zwissig, Natalya Korogod, Thomas Weiss
BACKGROUND: After stroke, regaining functional use of the upper limb can be challenging. Temporary deafferentation (TD) is a novel approach used in neurorehabilitation to voluntarily reduce the somatosensory input in a body part by temporary anesthesia; which has been shown to improve sensorimotor functions in the affected limb. OBJECTIVES: The primary objective of this systematic review was to present the best available evidence related to the effects of TD of the affected arm on the recovery of motor function and activity of the upper limb (arm and hand) following stroke...
December 2016: JBI Database of Systematic Reviews and Implementation Reports
https://www.readbyqxmd.com/read/28008078/an-evil-face-verbal-evaluative-multi-cs-conditioning-enhances-face-evoked-mid-latency-magnetoencephalographic-responses
#19
Markus Junghöfer, Maimu Alissa Rehbein, Julius Maitzen, Sebastian Schindler, Johanna Kissler
Humans have a remarkable capacity for rapid affective learning. For instance, using first-order US such as odors or electric shocks, magnetoencephalography (MEG) studies of Multi-CS conditioning demonstrate enhanced early (<150 ms) and mid-latency (150-300 ms) visual evoked responses to affectively conditioned faces, together with changes in stimulus evaluation. However, particularly in social contexts, human affective learning is often mediated by language, a class of complex higher-order US. To elucidate mechanisms of this type of learning, we investigate how face processing changes following evaluative Multi-CS conditioning...
December 21, 2016: Social Cognitive and Affective Neuroscience
https://www.readbyqxmd.com/read/28007515/measuring-meg-closer-to-the-brain-performance-of-on-scalp-sensor-arrays
#20
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
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