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https://www.readbyqxmd.com/read/28638316/a-new-generation-of-brain-computer-interfaces-driven-by-discovery-of-latent-eeg-fmri-linkages-using-tensor-decomposition
#1
Gopikrishna Deshpande, D Rangaprakash, Luke Oeding, Andrzej Cichocki, Xiaoping P Hu
A Brain-Computer Interface (BCI) is a setup permitting the control of external devices by decoding brain activity. Electroencephalography (EEG) has been extensively used for decoding brain activity since it is non-invasive, cheap, portable, and has high temporal resolution to allow real-time operation. Due to its poor spatial specificity, BCIs based on EEG can require extensive training and multiple trials to decode brain activity (consequently slowing down the operation of the BCI). On the other hand, BCIs based on functional magnetic resonance imaging (fMRI) are more accurate owing to its superior spatial resolution and sensitivity to underlying neuronal processes which are functionally localized...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28629974/the-effects-of-changes-in-object-location-on-object-identity-detection-a-simultaneous-eeg-fmri-study
#2
Ping Yang, Chenggui Fan, Min Wang, Noa Fogelson, Ling Li
Object identity and location are bound together to form a unique integration that is maintained and processed in visual working memory (VWM). Changes in task-irrelevant object location have been shown to impair the retrieval of memorial representations and the detection of object identity changes. However, the neural correlates of this cognitive process remain largely unknown. In the present study, we aim to investigate the underlying brain activation during object color change detection and the modulatory effects of changes in object location and VWM load...
June 16, 2017: NeuroImage
https://www.readbyqxmd.com/read/28628224/human-exposure-to-power-frequency-magnetic-fields-up-to-7-6%C3%A2-mt-an-integrated-eeg-fmri-study
#3
Julien Modolo, Alex W Thomas, Alexandre Legros
We assessed the effects of power-line frequency (60 Hz in North America) magnetic fields (MF) in humans using simultaneous electroencephalography (EEG) and functional magnetic resonance imaging (fMRI). Twenty-five participants were enrolled in a pseudo-double-blind experiment involving "real" or "sham" exposure to sinusoidal 60 Hz MF exposures delivered using the gradient coil of an MRI scanner following two conditions: (i) 10 s exposures at 3 mT (10 repetitions); (ii) 2 s exposures at 7.6 mT (100 repetitions)...
June 19, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/28610902/post-stimulus-fmri-and-eeg-responses-evidence-for-a-neuronal-origin-hypothesised-to-be-inhibitory
#4
K J Mullinger, M T Cherukara, R B Buxton, S T Francis, S D Mayhew
Post-stimulus undershoots, negative responses following cessation of stimulation, are widely observed in functional magnetic resonance (fMRI) blood oxygenation level dependent (BOLD) data. However, the debate surrounding whether the origin of this response phase is neuronal or vascular, and whether it provides functionally relevant information, that is additional to what is contained in primary response, means that undershoots are widely overlooked. We simultaneously recorded electroencephalography (EEG), BOLD and cerebral blood-flow (CBF) [obtained from arterial spin labelled (ASL) fMRI] fMRI responses to hemifield checkerboard stimulation to test the potential neural origin of the fMRI post-stimulus undershoot...
June 10, 2017: NeuroImage
https://www.readbyqxmd.com/read/28598432/neural-correlates-of-evidence-accumulation-during-value-based-decisions-revealed-via-simultaneous-eeg-fmri
#5
M Andrea Pisauro, Elsa Fouragnan, Chris Retzler, Marios G Philiastides
Current computational accounts posit that, in simple binary choices, humans accumulate evidence in favour of the different alternatives before committing to a decision. Neural correlates of this accumulating activity have been found during perceptual decisions in parietal and prefrontal cortex; however the source of such activity in value-based choices remains unknown. Here we use simultaneous EEG-fMRI and computational modelling to identify EEG signals reflecting an accumulation process and demonstrate that the within- and across-trial variability in these signals explains fMRI responses in posterior-medial frontal cortex...
June 9, 2017: Nature Communications
https://www.readbyqxmd.com/read/28586147/epileptic-networks-in-action-synchrony-between-distant-hemodynamic-responses
#6
Hui Ming Khoo, Nicolás von Ellenrieder, Natalja Zazubovits, François Dubeau, Jean Gotman
OBJECTIVE: Structural and functional imaging studies in focal epilepsy often reveal distributed regions of abnormality. These are interpreted as representing the existence of epileptic networks but the presence of actual neuronal interactions between these regions has not been demonstrated. We sought to determine if the distributed hemodynamic responses often seen in fMRI studies of scalp interictal epileptic discharges (IEDs) actually correspond to synchronized neuronal activities when examining the intracerebral EEG (iEEG) at distant nodes of the network...
June 6, 2017: Annals of Neurology
https://www.readbyqxmd.com/read/28552957/safety-and-eeg-data-quality-of-concurrent-high-density-eeg-and-high-speed-fmri-at-3-tesla
#7
Mette Thrane Foged, Ulrich Lindberg, Kishore Vakamudi, Henrik B W Larsson, Lars H Pinborg, Troels W Kjær, Martin Fabricius, Claus Svarer, Brice Ozenne, Carsten Thomsen, Sándor Beniczky, Olaf B Paulson, Stefan Posse
PURPOSE: Concurrent EEG and fMRI is increasingly used to characterize the spatial-temporal dynamics of brain activity. However, most studies to date have been limited to conventional echo-planar imaging (EPI). There is considerable interest in integrating recently developed high-speed fMRI methods with high-density EEG to increase temporal resolution and sensitivity for task-based and resting state fMRI, and for detecting interictal spikes in epilepsy. In the present study using concurrent high-density EEG and recently developed high-speed fMRI methods, we investigate safety of radiofrequency (RF) related heating, the effect of EEG on cortical signal-to-noise ratio (SNR) in fMRI, and assess EEG data quality...
2017: PloS One
https://www.readbyqxmd.com/read/28529731/a-bayesian-supervised-dual-dimensionality-reduction-model-for-simultaneous-decoding-of-lfp-and-spike-train-signals
#8
Andrew Holbrook, Alexander Vandenberg-Rodes, Norbert Fortin, Babak Shahbaba
Neuroscientists are increasingly collecting multimodal data during experiments and observational studies. Different data modalities-such as EEG, fMRI, LFP, and spike trains-offer different views of the complex systems contributing to neural phenomena. Here, we focus on joint modeling of LFP and spike train data, and present a novel Bayesian method for neural decoding to infer behavioral and experimental conditions. This model performs supervised dual-dimensionality reduction: it learns low-dimensional representations of two different sources of information that not only explain variation in the input data itself, but also predict extra-neuronal outcomes...
2017: Stat: the ISI's Journal for Rapid Dissemination of Statistics Research
https://www.readbyqxmd.com/read/28529472/a-comparative-study-of-average-linked-mastoid-and-rest-references-for-erp-components-acquired-during-fmri
#9
Ping Yang, Chenggui Fan, Min Wang, Ling Li
In simultaneous electroencephalogram (EEG) and functional magnetic resonance imaging (fMRI) studies, average reference (AR), and digitally linked mastoid (LM) are popular re-referencing techniques in event-related potential (ERP) analyses. However, they may introduce their own physiological signals and alter the EEG/ERP outcome. A reference electrode standardization technique (REST) that calculated a reference point at infinity was proposed to solve this problem. To confirm the advantage of REST in ERP analyses of synchronous EEG-fMRI studies, we compared the reference effect of AR, LM, and REST on task-related ERP results of a working memory task during an fMRI scan...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28473762/unimodal-versus-bimodal-eeg-fmri-neurofeedback-of-a-motor-imagery-task
#10
Lorraine Perronnet, Anatole Lécuyer, Marsel Mano, Elise Bannier, Fabien Lotte, Maureen Clerc, Christian Barillot
Neurofeedback is a promising tool for brain rehabilitation and peak performance training. Neurofeedback approaches usually rely on a single brain imaging modality such as EEG or fMRI. Combining these modalities for neurofeedback training could allow to provide richer information to the subject and could thus enable him/her to achieve faster and more specific self-regulation. Yet unimodal and multimodal neurofeedback have never been compared before. In the present work, we introduce a simultaneous EEG-fMRI experimental protocol in which participants performed a motor-imagery task in unimodal and bimodal NF conditions...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28445839/temporal-lobe-spikes-eeg-fmri-contributions-to-the-mesial-vs-lateral-debate
#11
Satsuki Watanabe, François Dubeau, Natalja Zazubovits, Jean Gotman
OBJECTIVE: It has been reported that interictal epileptic discharges (IEDs) recorded in temporal regions on scalp EEG are unlikely to originate from mesial temporal structures. However, EEG-fMRI sometimes show mesial temporal activation. We hypothesized that BOLD activation in the temporal neocortex is weaker than in the mesial structures, reflecting the fact that propagated activity has less metabolic demand than the original discharge. METHODS: Twelve patients with epilepsy who have BOLD response in mesial temporal structures were selected from our EEG-fMRI database...
June 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28422976/reactivation-or-transformation-motor-memory-consolidation-associated-with-cerebral-activation-time-locked-to-sleep-spindles
#12
Stuart Fogel, Genevieve Albouy, Bradley R King, Ovidiu Lungu, Catherine Vien, Arnaud Bore, Basile Pinsard, Habib Benali, Julie Carrier, Julien Doyon
Motor memory consolidation is thought to depend on sleep-dependent reactivation of brain areas recruited during learning. However, up to this point, there has been no direct evidence to support this assertion in humans, and the physiological processes supporting such reactivation are unknown. Here, simultaneous electroencephalographic and functional magnetic resonance imaging (EEG-fMRI) recordings were conducted during post-learning sleep to directly investigate the spindle-related reactivation of a memory trace formed during motor sequence learning (MSL), and its relationship to overnight enhancement in performance (reflecting consolidation)...
2017: PloS One
https://www.readbyqxmd.com/read/28361421/dynamics-of-interaction-of-neural-networks-in-the-course-of-eeg-alpha-biofeedback
#13
L I Kozlova, D D Bezmaternykh, M E Mel'nikov, A A Savelov, E D Petrovskii, M B Shtark
Brain EEG-fMRI activity was studied in subjects, who had successfully completed the EEG alpha stimulating training course (20 sessions): for 14 healthy men (20-35 years) three records were obtained in the feedback loop (biofeedback with EEG alpha rhythm with sound reinforcement): in the beginning, middle and at the end of the course. During alpha training, increased functional connectivity was revealed between precuneus network and anterior salience network, left executive control network, default mode network, primary visual network; anterior salience network and executive control network, visual-spatial network...
March 31, 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28359223/epileptic-discharge-related-functional-connectivity-within-and-between-networks-in-benign-epilepsy-with-centrotemporal-spikes
#14
Rong Li, Gong-Jun Ji, Yangyang Yu, Yang Yu, Mei-Ping Ding, Ye-Lei Tang, Huafu Chen, Wei Liao
Benign epilepsy with centrotemporal spikes (BECTS) is a common childhood epilepsy syndrome associated with abnormalities in neurocognitive domains, particularly during interictal epileptiform discharges (IEDs). Here, we investigated the effects of IEDs on brain's intrinsic connectivity networks in 43 BECTS patients and 28 matched healthy controls (HCs). Patients were further divided into IED and non-IED subgroups based on simultaneous EEG-fMRI recordings. Functional connectivity within and between five networks, corresponding to seizure origination and cognitive processes, were analyzed to measure IED effects...
January 10, 2017: International Journal of Neural Systems
https://www.readbyqxmd.com/read/28295228/cognitive-network-reorganization-following-surgical-control-of-seizures-in-lennox-gastaut-syndrome
#15
Aaron E L Warren, A Simon Harvey, David F Abbott, Simon J Vogrin, Catherine Bailey, Andrew Davidson, Graeme D Jackson, John S Archer
We previously observed that adults with Lennox-Gastaut syndrome (LGS) show abnormal functional connectivity among cognitive networks, suggesting that this may contribute to impaired cognition. Herein we report network reorganization following seizure remission in a child with LGS who underwent functional magnetic resonance imaging (fMRI) before and after resection of a cortical dysplasia. Concurrent electroencephalography (EEG) was acquired during presurgical fMRI. Presurgical and postsurgical functional connectivity were compared using (1) graph theoretical analyses of small-world network organization and node-wise strength; and (2) seed-based analyses of connectivity within and between five functional networks...
May 2017: Epilepsia
https://www.readbyqxmd.com/read/28294306/the-hemodynamic-response-to-interictal-epileptic-discharges-localizes-the-seizure-onset-zone
#16
Hui Ming Khoo, Yongfu Hao, Nicolás von Ellenrieder, Natalja Zazubovits, Jeffery Hall, André Olivier, François Dubeau, Jean Gotman
OBJECTIVE: Intracranial electroencephalography (EEG), performed presurgically in patients with drug-resistant and difficult-to-localize focal epilepsy, samples only a small fraction of brain tissue and thus requires strong hypotheses regarding the possible localization of the epileptogenic zone. EEG/fMRI (functional magnetic resonance imaging), a noninvasive tool resulting in hemodynamic responses, could contribute to the generation of these hypotheses. This study assessed how these responses, despite their interictal origin, predict the seizure-onset zone (SOZ)...
May 2017: Epilepsia
https://www.readbyqxmd.com/read/28269689/designing-and-testing-a-wearable-wireless-fnirs-patch
#17
Mohammadreza Abtahi, Gozde Cay, Manob Jyoti Saikia, Kunal Mankodiya
Optical brain monitoring using near infrared (NIR) light has got a lot of attention in order to study the complexity of the brain due to several advantages as oppose to other methods such as EEG, fMRI and PET. There are a few commercially available functional NIR spectroscopy (fNIRS) brain monitoring systems, but they are still non-wearable and pose difficulties in scanning the brain while the participants are in motion. In this work, we present our endeavors to design and test a low-cost, wireless fNIRS patch using NIR light sources at wavelengths of 770 and 830nm, photodetectors and a microcontroller to trigger the light sources, read photodetector's output and transfer data wirelessly (via Bluetooth) to a smart-phone...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28265244/contributions-of-eeg-fmri-to-assessing-the-epileptogenicity-of-focal-cortical-dysplasia
#18
Francesca Pittau, Lorenzo Ferri, Firas Fahoum, François Dubeau, Jean Gotman
Purpose: To examine the ability of the BOLD response to EEG spikes to assess the epileptogenicity of the lesion in patients with focal cortical dysplasia (FCD). Method: Patients with focal epilepsy and FCD who underwent 3T EEG-fMRI from 2006 to 2010 were included. Diagnosis of FCD was based on neuroradiology (MRI+), or histopathology in MRI-negative cases (MRI-). Patients underwent 120 min EEG-fMRI recording session. Spikes similar to those recorded outside the scanner were marked in the filtered EEG. The lesion (in MRI+) or the removed cortex (in MRI-) was marked on the anatomical T1 sequence, blindly to the BOLD response, after reviewing the FLAIR images...
2017: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/28253082/multimodal-imaging-evidence-for-a-frontoparietal-modulation-of-visual-cortex-during-the-selective-processing-of-conditioned-threat
#19
Nathan M Petro, L Forest Gruss, Siyang Yin, Haiqing Huang, Vladimir Miskovic, Mingzhou Ding, Andreas Keil
Emotionally salient cues are detected more readily, remembered better, and evoke greater visual cortical responses compared with neutral stimuli. The current study used concurrent EEG-fMRI recordings to identify large-scale network interactions involved in the amplification of visual cortical activity when viewing aversively conditioned cues. To generate a continuous neural signal from pericalcarine visual cortex, we presented rhythmic (10/sec) phase-reversing gratings, the orientation of which predicted the presence (CS+) or absence (CS-) of a cutaneous electric shock (i...
June 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/28227950/designing-and-testing-a-wearable-wireless-fnirs-patch
#20
Mohammadreza Abtahi, Gozde Cay, Manob Jyoti Saikia, Kunal Mankodiya, Mohammadreza Abtahi, Gozde Cay, Manob Jyoti Saikia, Kunal Mankodiya, Manob Jyoti Saikia, Kunal Mankodiya, Gozde Cay, Mohammadreza Abtahi
Optical brain monitoring using near infrared (NIR) light has got a lot of attention in order to study the complexity of the brain due to several advantages as oppose to other methods such as EEG, fMRI and PET. There are a few commercially available functional NIR spectroscopy (fNIRS) brain monitoring systems, but they are still non-wearable and pose difficulties in scanning the brain while the participants are in motion. In this work, we present our endeavors to design and test a low-cost, wireless fNIRS patch using NIR light sources at wavelengths of 770 and 830nm, photodetectors and a microcontroller to trigger the light sources, read photodetector's output and transfer data wirelessly (via Bluetooth) to a smart-phone...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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