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Magnetoencephalography

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https://www.readbyqxmd.com/read/29781091/fetal-assessment-in-buprenorphine-maintained-women-using-fetal-magnetoencephalography-a-pilot-study
#1
Diana Escalona-Vargas, Jessica L Coker, Shona Ray-Griffith, Eric R Siegel, Curtis L Lowery, Zachary N Stowe, Hari Eswaran
BACKGROUND AND AIMS: In-utero exposure to opioids including buprenorphine (BUP) has been shown to affect fetal activity, specifically heart-rate variability (FHRV) and fetal movement (FM). Our objective was to extract simultaneous recordings of fetal cardiac, and brain-related activity in BUP-maintained and non-opioid exposed pregnant women using a novel non-invasive biomagnetic technique. DESIGN: A pilot study was conducted, recording and analyzing biomagnetic data from fetuses of BUP-maintained and non-opioid exposed pregnant women...
May 20, 2018: Addiction
https://www.readbyqxmd.com/read/29780315/automatic-processing-of-changes-in-facial-emotions-in-dysphoria-a-magnetoencephalography-study
#2
Qianru Xu, Elisa M Ruohonen, Chaoxiong Ye, Xueqiao Li, Kairi Kreegipuu, Gabor Stefanics, Wenbo Luo, Piia Astikainen
It is not known to what extent the automatic encoding and change detection of peripherally presented facial emotion is altered in dysphoria. The negative bias in automatic face processing in particular has rarely been studied. We used magnetoencephalography (MEG) to record automatic brain responses to happy and sad faces in dysphoric (Beck's Depression Inventory ≥ 13) and control participants. Stimuli were presented in a passive oddball condition, which allowed potential negative bias in dysphoria at different stages of face processing (M100, M170, and M300) and alterations of change detection (visual mismatch negativity, vMMN) to be investigated...
2018: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29778061/syntactic-and-semantic-restrictions-on-morphological-recomposition-meg-evidence-from-greek
#3
K Neophytou, C Manouilidou, L Stockall, A Marantz
Complex morphological processing has been extensively studied in the past decades. However, most of this work has either focused on only certain steps involved in this process, or it has been conducted on a few languages, like English. The purpose of the present study is to investigate the spatiotemporal cortical processing profile of the distinct steps previously reported in the literature, from decomposition to re-composition of morphologically complex items, in a relatively understudied language, Greek. Using magnetoencephalography, we confirm the role of the fusiform gyrus in early, form-based morphological decomposition, we relate the syntactic licensing of stem-suffix combinations to the ventral visual processing stream, somewhat independent from lexical access for the stem, and we further elucidate the role of orbitofrontal regions in semantic composition...
May 16, 2018: Brain and Language
https://www.readbyqxmd.com/read/29777825/the-temporal-evolution-of-conceptual-object-representations-revealed-through-models-of-behavior-semantics-and-deep-neural-networks
#4
B B Bankson, M N Hebart, I I A Groen, C I Baker
Visual object representations are commonly thought to emerge rapidly, yet it has remained unclear to what extent early brain responses reflect purely low-level visual features of these objects and how strongly those features contribute to later categorical or conceptual representations. Here, we aimed to estimate a lower temporal bound for the emergence of conceptual representations by defining two criteria that characterize such representations: 1) conceptual object representations should generalize across different exemplars of the same object, and 2) these representations should reflect high-level behavioral judgments...
May 16, 2018: NeuroImage
https://www.readbyqxmd.com/read/29772381/high-gamma-activity-in-the-human-hippocampus-and-parahippocampus-during-inter-trial-rest-periods-of-a-virtual-navigation-task
#5
Yi Pu, Brian R Cornwell, Douglas Cheyne, Blake W Johnson
In rodents, hippocampal cell assemblies formed during learning of a navigation task are observed to re-emerge during resting (offline) periods, accompanied by high-frequency oscillations (HFOs). This phenomenon is believed to reflect mechanisms for strengthening newly-formed memory traces. Using magnetoencephalography recordings and a beamforming source location algorithm (synthetic aperture magnetometry), we investigated high-gamma (80-140 Hz) oscillations in the hippocampal region in 18 human participants during inter-trial rest periods in a virtual navigation task...
May 14, 2018: NeuroImage
https://www.readbyqxmd.com/read/29766591/bilateral-activations-in-operculo-insular-area-show-temporal-dissociation-after-peripheral-electrical-stimulation-in-healthy-adults
#6
Pekka Hautasaari, Harri Saloranta, Andrej M Savić, Katariina Korniloff, Urho M Kujala, Ina M Tarkka
Interhemispheric transfer is necessary for sensory integration and coordination of body sides. We studied how somatosensory input from one body side may reach both body sides. First, we investigated with 17 healthy adults which uni- and bilateral brain areas were involved in consecutive stages of automatic sensory processing of non-nociceptive peripheral stimulation. Somatosensory evoked fields (SEFs) to electrical stimulation were recorded with 306-channel magnetoencephalography in two conditions. First, SEFs were registered following sensory radial nerve (RN) stimulation to dorsal surface of the right hand and second, following median nerve (MN) stimulation at the right wrist...
May 15, 2018: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29766384/increased-functional-meg-connectivity-as-a-hallmark-of-mri-negative-focal-and-generalized-epilepsy
#7
Yiwen Li Hegner, Justus Marquetand, Adham Elshahabi, Silke Klamer, Holger Lerche, Christoph Braun, Niels K Focke
Epilepsy is one of the most prevalent neurological diseases with a high morbidity. Accumulating evidence has shown that epilepsy is an archetypical neural network disorder. Here we developed a non-invasive cortical functional connectivity analysis based on magnetoencephalography (MEG) to assess commonalities and differences in the network phenotype in different epilepsy syndromes (non-lesional/cryptogenic focal and idiopathic/genetic generalized epilepsy). Thirty-seven epilepsy patients with normal structural brain anatomy underwent a 30-min resting state MEG measurement with eyes closed...
May 15, 2018: Brain Topography
https://www.readbyqxmd.com/read/29765298/real-time-tracking-of-selective-auditory-attention-from-m-eeg-a-bayesian-filtering-approach
#8
Sina Miran, Sahar Akram, Alireza Sheikhattar, Jonathan Z Simon, Tao Zhang, Behtash Babadi
Humans are able to identify and track a target speaker amid a cacophony of acoustic interference, an ability which is often referred to as the cocktail party phenomenon. Results from several decades of studying this phenomenon have culminated in recent years in various promising attempts to decode the attentional state of a listener in a competing-speaker environment from non-invasive neuroimaging recordings such as magnetoencephalography (MEG) and electroencephalography (EEG). To this end, most existing approaches compute correlation-based measures by either regressing the features of each speech stream to the M/EEG channels (the decoding approach) or vice versa (the encoding approach)...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29762101/stimulus-familiarity-and-expectation-jointly-modulate-neural-activity-in-the-visual-ventral-stream
#9
Mariya E Manahova, Pim Mostert, Peter Kok, Jan-Mathijs Schoffelen, Floris P de Lange
Prior knowledge about the visual world can change how a visual stimulus is processed. Two forms of prior knowledge are often distinguished: stimulus familiarity (i.e., whether a stimulus has been seen before) and stimulus expectation (i.e., whether a stimulus is expected to occur, based on the context). Neurophysiological studies in monkeys have shown suppression of spiking activity both for expected and for familiar items in object-selective inferotemporal cortex. It is an open question, however, if and how these types of knowledge interact in their modulatory effects on the sensory response...
May 15, 2018: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/29762100/top-down-control-of-alpha-phase-adjustment-in-anticipation-of-temporally-predictable-visual-stimuli
#10
Rodolfo Solís-Vivanco, Ole Jensen, Mathilde Bonnefond
Alpha oscillations (8-14 Hz) are proposed to represent an active mechanism of functional inhibition of neuronal processing. Specifically, alpha oscillations are associated with pulses of inhibition repeating every ∼100 msec. Whether alpha phase, similar to alpha power, is under top-down control remains unclear. Moreover, the sources of such putative top-down phase control are unknown. We designed a cross-modal (visual/auditory) attention study in which we used magnetoencephalography to record the brain activity from 34 healthy participants...
May 15, 2018: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/29755402/default-mode-network-oscillatory-coupling-is-increased-following-concussion
#11
Benjamin T Dunkley, Karolina Urban, Leodante Da Costa, Simeon M Wong, Elizabeth W Pang, Margot J Taylor
Concussion is a common form of mild traumatic brain injury. Despite the descriptor "mild," a single injury can leave long-lasting and sustained alterations to brain function, including changes to localized activity and large-scale interregional communication. Cognitive complaints are thought to arise from such functional deficits. We investigated the impact of injury on neurophysiological and functionally specialized resting networks, known as intrinsic connectivity networks (ICNs), using magnetoencephalography...
2018: Frontiers in Neurology
https://www.readbyqxmd.com/read/29755332/neurofeedback-and-the-neural-representation-of-self-lessons-from-awake-state-and-sleep
#12
Andreas A Ioannides
Neurofeedback has been around for half a century, but despite some promising results it is not yet widely appreciated. Recently, some of the concerns about neurofeedback have been addressed with functional magnetic resonance imaging and magnetoencephalography adding their contributions to the long history of neurofeedback with electroencephalography. Attempts to address other concerns related to methodological issues with new experiments and meta-analysis of earlier studies, have opened up new questions about its efficacy...
2018: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29755314/non-invasive-investigation-of-human-hippocampal-rhythms-using-magnetoencephalography-a-review
#13
REVIEW
Yi Pu, Douglas O Cheyne, Brian R Cornwell, Blake W Johnson
Hippocampal rhythms are believed to support crucial cognitive processes including memory, navigation, and language. Due to the location of the hippocampus deep in the brain, studying hippocampal rhythms using non-invasive magnetoencephalography (MEG) recordings has generally been assumed to be methodologically challenging. However, with the advent of whole-head MEG systems in the 1990s and development of advanced source localization techniques, simulation and empirical studies have provided evidence that human hippocampal signals can be sensed by MEG and reliably reconstructed by source localization algorithms...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29750730/the-changing-landscape-of-motor-neuron-disease-imaging-the-transition-from-descriptive-studies-to-precision-clinical-tools
#14
Peter Bede, Giorgia Querin, Pierre-François Pradat
PURPOSE OF REVIEW: Neuroimaging in motor neuron disease (MND) has traditionally been seen as an academic tool with limited direct relevance to individualized patient care. This has changed radically in recent years as computational imaging has emerged as a viable clinical tool with true biomarker potential. This transition is not only fuelled by technological advances but also by important conceptual developments. RECENT FINDINGS: The natural history of MND is now evaluated by presymptomatic, postmortem and multi-timepoint longitudinal imaging studies...
May 9, 2018: Current Opinion in Neurology
https://www.readbyqxmd.com/read/29746486/localizing-on-scalp-meg-sensors-using-an-array-of-magnetic-dipole-coils
#15
Christoph Pfeiffer, Lau M Andersen, Daniel Lundqvist, Matti Hämäläinen, Justin F Schneiderman, Robert Oostenveld
Accurate estimation of the neural activity underlying magnetoencephalography (MEG) signals requires co-registration i.e., determination of the position and orientation of the sensors with respect to the head. In modern MEG systems, an array of hundreds of low-Tc SQUID sensors is used to localize a set of small, magnetic dipole-like (head-position indicator, HPI) coils that are attached to the subject's head. With accurate prior knowledge of the positions and orientations of the sensors with respect to one another, the HPI coils can be localized with high precision, and thereby the positions of the sensors in relation to the head...
2018: PloS One
https://www.readbyqxmd.com/read/29740300/spectral-spatial-differentiation-of-brain-activity-during-mental-imagery-of-improvisational-music-performance-using-meg
#16
Jared Boasen, Yuya Takeshita, Shinya Kuriki, Koichi Yokosawa
Group musical improvisation is thought to be akin to conversation, and therapeutically has been shown to be effective at improving communicativeness, sociability, creative expression, and overall psychological health. To understand these therapeutic effects, clarifying the nature of brain activity during improvisational cognition is important. Some insight regarding brain activity during improvisational music cognition has been gained via functional magnetic resonance imaging (fMRI) and electroencephalography (EEG)...
2018: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29739978/monitoring-the-past-and-choosing-the-future-the-prefrontal-cortical-influences-on-voluntary-action
#17
H N Phillips, T E Cope, L E Hughes, J Zhang, J B Rowe
Choosing between equivalent response options requires the resolution of ambiguity. One could facilitate such decisions by monitoring previous actions and implementing transient or arbitrary rules to differentiate response options. This would reduce the entropy of chosen actions. We examined voluntary action decisions during magnetoencephalography, identifying the spatiotemporal correlates of stimulus- and choice-entropy. Negative correlations between frontotemporal activity and entropy of past trials were observed after participants' responses, reflecting sequential monitoring of recent events...
May 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29735418/lack-of-correlation-between-phonetic-magnetic-mismatch-field-and-plasma-d-serine-levels-in-humans
#18
Motomu Suga, Yuki Kawakubo, Yukika Nishimura, Kenji Hashimoto, Masato Yumoto, Kiyoto Kasai
OBJECTIVE: Uncovering molecular bases for auditory language processing in the human brain is a fundamental scientific challenge. The power and latency of the magnetic mismatch field (MMF) elicited by phoneme change, which are magnetoencephalographic indices of language function in its early stage of information processing, are theoretically thought to be modulated by N-methyl-d-aspartate-type glutamate receptor (NMDAR) function, but no study has yet assessed this possibility. We have thus sought to demonstrate an association between phonetic MMF power/latency and levels of plasma d-serine, an intrinsic co-agonist of glycine binding sites on NMDAR, in adults...
April 24, 2018: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29734005/complexity-analysis-of-spontaneous-brain-activity-in-mood-disorders-a-magnetoencephalography-study-of-bipolar-disorder-and-major-depression
#19
Alberto Fernández, Ali H Al-Timemy, Francisco Ferre, Gabriel Rubio, Javier Escudero
BACKGROUND AND PURPOSE: The lack of a biomarker for Bipolar Disorder (BD) causes problems in the differential diagnosis with other mood disorders such as major depression (MD), and misdiagnosis frequently occurs. Bearing this in mind, we investigated non-linear magnetoencephalography (MEG) patterns in BD and MD. METHODS: Lempel-Ziv Complexity (LZC) was used to evaluate the resting-state MEG activity in a cross-sectional sample of 60 subjects, including 20 patients with MD, 16 patients with BD type-I, and 24 control (CON) subjects...
April 26, 2018: Comprehensive Psychiatry
https://www.readbyqxmd.com/read/29733953/anticipatory-neural-dynamics-of-spatial-temporal-orienting-of-attention-in-younger-and-older-adults
#20
Simone G Heideman, Gustavo Rohenkohl, Joshua J Chauvin, Clare E Palmer, Freek van Ede, Anna C Nobre
Spatial and temporal expectations act synergistically to facilitate visual perception. In the current study, we sought to investigate the anticipatory oscillatory markers of combined spatial-temporal orienting and to test whether these decline with ageing. We examined anticipatory neural dynamics associated with joint spatial-temporal orienting of attention using magnetoencephalography (MEG) in both younger and older adults. Participants performed a cued covert spatial-temporal orienting task requiring the discrimination of a visual target...
May 4, 2018: NeuroImage
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