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https://www.readbyqxmd.com/read/28227519/kernel-temporal-enhancement-approach-for-loreta-source-reconstruction-using-eeg-data
#1
Cristian A Torres-Valencia, M Claudia Joana Santamaria, Mauricio A Alvarez, Cristian A Torres-Valencia, M Claudia Joana Santamaria, Mauricio A Alvarez, Mauricio A Alvarez, Cristian A Torres-Valencia
Reconstruction of brain sources from magnetoencephalography and electroencephalography (M/EEG) data is a well known problem in the neuroengineering field. A inverse problem should be solved and several methods have been proposed. Low Resolution Electromagnetic Tomography (LORETA) and the different variations proposed as standardized LORETA (sLORETA) and the standardized weighted LORETA (swLORETA) have solved the inverse problem following a non-parametric approach, that is by setting dipoles in the whole brain domain in order to estimate the dipole positions from the M/EEG data and assuming some spatial priors...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227411/source-imaging-of-simple-finger-movements-captured-during-auditory-response-tasks-using-space-time-frequency-based-sparsity-constraints
#2
Aritra Chaudhuri, Aurobinda Routray, Aritra Chaudhuri, Aurobinda Routray, Aurobinda Routray, Aritra Chaudhuri
Neural Information Flow during simple cognitive or motor actions is a significant research topic; one of which is a simple finger movement. In this paper, Electro-encephalograph (EEG) Source Imaging has been used to model the Neural Information flow, during performance of a simple Auditory Response Task (ART), specifically by employment of a space-time-frequency sparsity constrained based algorithm, namely, Spatio-temporal Unifying Tomography (STOUT). The estimated sources are then studied according to location defined based on Destrieux atlas...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226449/comparison-of-imaging-modalities-and-source-localization-algorithms-in-locating-the-induced-activity-during-deep-brain-stimulation-of-the-stn
#3
K G Mideksa, A Singh, N Hoogenboom, H Hellriegel, H Krause, A Schnitzler, G Deuschl, J Raethjen, G Schmidt, M Muthuraman, K G Mideksa, A Singh, N Hoogenboom, H Hellriegel, H Krause, A Schnitzler, G Deuschl, J Raethjen, G Schmidt, M Muthuraman, G Deuschl, K G Mideksa, A Singh, H Krause, A Schnitzler, N Hoogenboom, M Muthuraman, J Raethjen, G Schmidt, H Hellriegel
One of the most commonly used therapy to treat patients with Parkinson's disease (PD) is deep brain stimulation (DBS) of the subthalamic nucleus (STN). Identifying the most optimal target area for the placement of the DBS electrodes have become one of the intensive research area. In this study, the first aim is to investigate the capabilities of different source-analysis techniques in detecting deep sources located at the sub-cortical level and validating it using the a-priori information about the location of the source, that is, the STN...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28193497/i-act-therefore-i-err-eeg-correlates-of-success-and-failure-in-a-virtual-throwing-game
#4
Boris Yazmir, Miriam Reiner
What are the neural responses to success and failure in a throwing task? To answer this question, we compared Event Related Potentials (ERPs) correlated with success and failure during a highly-ecological-virtual game. Participants played a tennis-like game in an immersive 3D virtual world, against a computer player, by controlling a virtual tennis racket with a force feedback robotic arm. Results showed that success, i.e. hitting the target, and failure, by missing the target, evoked ERP's that differ by peak, latencies, scalp signal distributions, sLORETA source estimation, and time-frequency patterns...
February 11, 2017: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/28116447/localized-n20-component-of-somatosensory-evoked-magnetic-fields-in-frontoparietal-brain-tumor-patients-using-noise-normalized-approaches
#5
Nor Safira Elaina, Aamir Saeed Malik, Wafaa Khazaal Shams, Nasreen Badruddin, Jafri Malin Abdullah, Mohammad Faruque Reza
PURPOSE: To localize sensorimotor cortical activation in 10 patients with frontoparietal tumors using quantitative magnetoencephalography (MEG) with noise-normalized approaches. MATERIAL AND METHODS: Somatosensory evoked magnetic fields (SEFs) were elicited in 10 patients with somatosensory tumors and in 10 control participants using electrical stimulation of the median nerve via the right and left wrists. We localized the N20m component of the SEFs using dynamic statistical parametric mapping (dSPM) and standardized low-resolution brain electromagnetic tomography (sLORETA) combined with 3D magnetic resonance imaging (MRI)...
January 23, 2017: Clinical Neuroradiology
https://www.readbyqxmd.com/read/28110926/distributed-source-localization-of-interictal-spikes-in-benign-childhood-epilepsy-with-centrotemporal-spikes-a-standardized-low-resolution-brain-electromagnetic-tomography-sloreta-study
#6
Tae-Hoon Eom, Jung-Hyun Shin, Young-Hoon Kim, Seung-Yun Chung, In-Goo Lee, Jung-Min Kim
Benign childhood epilepsy with centrotemporal spikes (BCECTS), also known as Rolandic epilepsy, is the most common benign childhood epilepsy. Centrotemporal spikes are characteristic findings on electroencephalography (EEG). Though the condition is considered benign, many studies have reported some degree of neuropsychological impairment in individuals with BCECTS. There is also growing evidence from neuroimaging studies that BCECTS may affect a larger portion of the brain than originally thought. We performed distributed source localization analysis of interictal spikes in BCECTS...
January 16, 2017: Journal of Clinical Neuroscience: Official Journal of the Neurosurgical Society of Australasia
https://www.readbyqxmd.com/read/28007611/time-course-and-localization-of-brain-activity-in-humor-comprehension-an-erp-sloreta-study
#7
Midori Shibata, Yuri Terasawa, Takahiro Osumi, Keita Masui, Yuichi Ito, Arisa Sato, Satoshi Umeda
Although a number of studies have investigated the incongruity-detection and resolution process in humor comprehension, it is difficult to functionally and anatomically dissociate these processes. We used event-related potentials (ERP) and standardized low resolution brain electromagnetic tomography analysis (sLORETA) to examine the time course and localization of brain activity during incongruity detection and resolution. We used the same materials as in our previous fMRI study. Eighteen participants read funny and unfunny scenarios and judged whether the target sentence was funny or not...
December 19, 2016: Brain Research
https://www.readbyqxmd.com/read/27992543/meg-frequency-analysis-depicts-the-impaired-neurophysiological-condition-of-ischemic-brain
#8
Shinichi Sakamoto, Hidetoshi Ikeda, Naohiro Tsuyuguchi, Takehiro Uda, Eiichi Okumura, Takashi Asakawa, Yasuhiro Haruta, Hideki Nishiyama, Toyoji Okada, Hajime Kamada, Kenji Ohata, Yukio Miki
PURPOSE: Quantitative imaging of neuromagnetic fields based on automated region of interest (ROI) setting was analyzed to determine the characteristics of cerebral neural activity in ischemic areas. METHODS: Magnetoencephalography (MEG) was used to evaluate spontaneous neuromagnetic fields in the ischemic areas of 37 patients with unilateral internal carotid artery (ICA) occlusive disease. Voxel-based time-averaged intensity of slow waves was obtained in two frequency bands (0...
2016: PloS One
https://www.readbyqxmd.com/read/27987251/simultaneous-rsfmri-and-eeg-recordings-of-functional-connectivity-in-patients-with-schizophrenia
#9
Eiji Kirino, Shoji Tanaka, Mayuko Fukuta, Rie Inami, Heii Arai, Reiichi Inoue, Shigeki Aoki
AIMS: It remains unclear how functional connectivity (FC) may be related to specific cognitive domains in neuropsychiatric disorders. Here we used simultaneous resting-state functional MRI (rsfMRI) and electroencephalography (EEG) recording in patients with schizophrenia, to evaluate FC within and outside the default mode network (DMN). METHODS: Our study population included 14 patients with schizophrenia and 15 healthy control participants. From all participants, we acquired rsfMRI data, and simultaneously recorded EEG data using an MR-compatible amplifier...
December 17, 2016: Psychiatry and Clinical Neurosciences
https://www.readbyqxmd.com/read/27936219/combined-emd-sloreta-analysis-of-eeg-data-collected-during-a-contour-integration-task
#10
Karema Al-Subari, Saad Al-Baddai, Ana Maria Tomé, Gregor Volberg, Bernd Ludwig, Elmar W Lang
Lately, Ensemble Empirical Mode Decomposition (EEMD) techniques receive growing interest in biomedical data analysis. Event-Related Modes (ERMs) represent features extracted by an EEMD from electroencephalographic (EEG) recordings. We present a new approach for source localization of EEG data based on combining ERMs with inverse models. As the first step, 64 channel EEG recordings are pooled according to six brain areas and decomposed, by applying an EEMD, into their underlying ERMs. Then, based upon the problem at hand, the most closely related ERM, in terms of frequency and amplitude, is combined with inverse modeling techniques for source localization...
2016: PloS One
https://www.readbyqxmd.com/read/27889426/a-selective-review-of-dharana-and-dhyana-in-healthy-participants
#11
REVIEW
Shirley Telles, Nilkamal Singh, Ram Kumar Gupta, Acharya Balkrishna
Attention is an important part of the process of meditation. Traditional Yoga texts describe two stages of meditation which follow each other in sequence. These are meditative focusing (dharana in Sanskrit) and effortless meditation (dhyana in Sanskrit). This review evaluated eight experimental studies conducted on participants in normal health, who practiced dharana and dhyana. The studies included evaluation of autonomic and respiratory variables, eLORETA and sLORETA assessments of the EEG, evoked potentials, functional magnetic resonance imaging, cancellation task performance and emotional intelligence...
October 2016: Journal of Ayurveda and Integrative Medicine
https://www.readbyqxmd.com/read/27852164/transcranial-magnetic-stimulation-modulates-resting-eeg-functional-connectivity-between-the-left-dorsolateral-prefrontal-cortex-and-limbic-regions-in-medicated-patients-with-treatment-resistant-depression
#12
Shinsuke Kito, Takashi Hasegawa, Akihiro Takamiya, Takamasa Noda, Kazuyuki Nakagome, Teruhiko Higuchi, Yoshihiko Koga
High-frequency left prefrontal repetitive transcranial magnetic stimulation (rTMS) has been shown to have efficacy in treatment-resistant depression. However, the effects of rTMS on functional connectivity are still not clear. To examine changes in functional connectivity before and after rTMS, resting EEG of 14 patients with treatment-resistant depression was recorded twice at baseline and at week 4, respectively. The EEG data were analyzed using the standardized low-resolution brain electromagnetic tomography (sLORETA)...
November 17, 2016: Journal of Neuropsychiatry and Clinical Neurosciences
https://www.readbyqxmd.com/read/27835807/acute-stress-impairs-frontocingulate-activation-during-error-monitoring-in-remitted-depression
#13
Alexis E Whitton, Ashlee Van't Veer, Pragya Kakani, Daniel G Dillon, Manon L Ironside, Anja Haile, David J Crowley, Diego A Pizzagalli
Deficits in cognitive control are a hallmark characteristic of depression, however less is known about the degree to which they persist beyond symptom remission and might contribute to symptom recurrence in remitted individuals (rMDD). Evidence indicates that stress interferes with cognitive control, highlighting a potential mechanism by which stress precipitates depression relapse. Therefore, this study examined whether stress exposure elicits deficits in error monitoring - a component of cognitive control thought to be particularly implicated in the ability to adaptively respond to negative feedback - in individuals with rMDD...
January 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/27816702/neural-correlates-of-user-initiated-motor-success-and-failure-a-brain-computer-interface-perspective
#14
Boris Yazmir, Miriam Reiner
Any motor action is, by nature, potentially accompanied by human errors. In order to facilitate development of error-tailored Brain-Computer Interface (BCI) correction systems, we focused on internal, human-initiated errors, and investigated EEG correlates of user outcome successes and errors during a continuous 3D virtual tennis game against a computer player. We used a multisensory, 3D, highly immersive environment. Missing and repelling the tennis ball were considered, as 'error' (miss) and 'success' (repel)...
November 2, 2016: Neuroscience
https://www.readbyqxmd.com/read/27777557/snap-your-fingers-an-erp-sloreta-study-investigating-implicit-processing-of-self-vs-other-related-movement-sounds-using-the-passive-oddball-paradigm
#15
Christoph Justen, Cornelia Herbert
So far, neurophysiological studies have investigated implicit and explicit self-related processing particularly for self-related stimuli such as the own face or name. The present study extends previous research to the implicit processing of self-related movement sounds and explores their spatio-temporal dynamics. Event-related potentials (ERPs) were assessed while participants (N = 12 healthy subjects) listened passively to previously recorded self- and other-related finger snapping sounds, presented either as deviants or standards during an oddball paradigm...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/27664111/electro-physiological-changes-in-the-brain-induced-by-caffeine-or-glucose-nasal-spray
#16
K De Pauw, B Roelands, J Van Cutsem, U Marusic, T Torbeyns, R Meeusen
OBJECTIVE: A direct link between the mouth cavity and the brain for glucose (GLUC) and caffeine (CAF) has been established. The aim of this study is to determine whether a direct link for both substrates also exist between the nasal cavity and the brain. METHODS: Ten healthy male subjects (age 22 ± 1 years) performed three experimental trials, separated by at least 2 days. Each trial included a 20-s nasal spray (NAS) period in which solutions placebo (PLAC), GLUC, or CAF were provided in a double-blind, randomized order...
January 2017: Psychopharmacology
https://www.readbyqxmd.com/read/27659288/the-time-course-of-activity-within-the-dorsal-and-rostral-ventral-anterior-cingulate-cortex-in-the-emotional-stroop-task
#17
Farah Shahnaz Feroz, Gregor Leicht, Saskia Steinmann, Christina Andreou, Christoph Mulert
Growing evidence from neuroimaging studies suggest that emotional and cognitive processes are interrelated. Anatomical key structures in this context are the dorsal and rostral-ventral anterior cingulate cortex (dACC and rvACC). However, up to now, the time course of activations within these regions during emotion-cognition interactions has not been disentangled. In the present study, we used event-related potentials (ERP) and standardized low-resolution electromagnetic tomography (sLORETA) region of interest (ROI) source localization analyses to explore the time course of neural activations within the dACC and rvACC using a modified emotional Stroop paradigm...
January 2017: Brain Topography
https://www.readbyqxmd.com/read/27630610/electrophysiological-evidence-reveals-differences-between-the-recognition-of-microexpressions-and-macroexpressions
#18
Xunbing Shen, Qi Wu, Ke Zhao, Xiaolan Fu
Microexpressions are fleeting facial expressions that are important for judging people's true emotions. Little is known about the neural mechanisms underlying the recognition of microexpressions (with duration of less than 200 ms) and macroexpressions (with duration of greater than 200 ms). We used an affective priming paradigm in which a picture of a facial expression is the prime and an emotional word is the target, and electroencephalogram (EEG) and event-related potentials (ERPs) to examine neural activities associated with recognizing microexpressions and macroexpressions...
2016: Frontiers in Psychology
https://www.readbyqxmd.com/read/27616474/interactive-effect-of-5-httlpr-genotype-and-age-on-sources-of-cortical-rhythms-in-healthy-women
#19
Nina V Volf, Ludmila V Belousova, Gennady G Knyazev, Alexander V Kulikov
This study was aimed to localize the effects of 5-HTTLPR (serotonin-transporter-linked polymorphic region) on the age differences of spontaneous EEG activity in women using neuroimaging analysis sLORETA (Standardized Low Resolution brain Electromagnetic Tomography). DNA samples extracted from cheek swabs and resting-state EEG recorded at 60 standard leads were collected from young (YW, N=86, 18-35years) and older (OW, N=45; 55-80years) healthy women. We have shown that advanced age was associated with increased posterior EEG desynchronization in S'/S'...
November 2016: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/27559990/depressive-symptoms-and-autobiographical-memory-a-pilot-electroencephalography-eeg-study
#20
Gennady G Knyazev, Alexander N Savostyanov, Andrey V Bocharov, Valeriya B Kuznetsova
INTRODUCTION: Functional magnetic resonance imaging studies have shown changes in the activity of medial prefrontal, medial temporal, and occipital regions in major depressive disorder patients during recall of autobiographical memories. Electrophysiological underpinning of these changes is not known. It is also not clear whether they are a part of the clinical picture or appear at preclinical stages in individuals predisposed to depression. METHOD: In this study, the effect of depressive symptoms, as measured by the Beck Depression Inventory (BDI-II), on oscillatory dynamics accompanying retrieval of emotionally positive and negative autobiographical memories was investigated in a nonclinical sample using electroencephalographic event-related spectral power and connectivity measures...
August 25, 2016: Journal of Clinical and Experimental Neuropsychology
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