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https://www.readbyqxmd.com/read/29124352/brain-waves-from-an-isolated-cortex-contribution-of-the-anterior-insula-to-cognitive-functions
#1
Rinaldo Livio Perri, Marika Berchicci, Valentina Bianco, Donatella Spinelli, Francesco Di Russo
Using two independent electrical neuroimaging techniques (BESA and sLORETA), we tested a fMRI-seeded source modeling indicating that in visual discriminative tasks the anterior insula (aIns) participates in the generation of three prefrontal ERP components: the pN1 (at 115 ms), the pP1 (at 170 ms), and the pP2 (at 300 ms). This latter component represented the focus of the present study. Results showed that the pP2 had different activation profiles across hemispheres. The left aIns activity peaked at 420 ms (30 ms before the response) for both Go and No-go trials, that is independently from the ultimate choice (response or inhibition)...
November 9, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/29111591/magnetoencephalographic-imaging-of-ictal-high-frequency-oscillations-80-200%C3%A2-hz-in-pharmacologically-resistant-focal-epilepsy
#2
Jayabal Velmurugan, Srikantan S Nagarajan, Narayanan Mariyappa, Shankar G Ravi, Kandavel Thennarasu, Ravindranadh C Mundlamuri, Kenchaiah Raghavendra, Rose Dawn Bharath, Jitender Saini, Arimappamagan Arivazhagan, Jamuna Rajan, Anita Mahadevan, Malla B Rao, Parthasarathy Satishchandra, Sanjib Sinha
OBJECTIVE: Specificity of ictal high-frequency oscillations (HFOs) in identifying epileptogenic abnormality is significant, compared to the spikes and interictal HFOs. The objectives of the study were to detect and to localize ictal HFOs by magnetoencephalography (MEG) for identifying the seizure onset zone (SOZ), evaluate the cortical excitability from preictal to ictal transition, and establish HFO concordance rates with other modalities and postsurgical resection. METHODS: Sixty-seven patients with drug-resistant epilepsy had at least 1 spontaneous seizure each during MEG acquisition, and analysis was carried out on 20 seizures from 20 patients...
November 7, 2017: Epilepsia
https://www.readbyqxmd.com/read/29060041/a-sloreta-study-for-gaze-independent-bci-speller
#3
Xingwei An, Jinwen Wei, Shuang Liu, Dong Ming
EEG-based BCI (brain-computer-interface) speller, especially gaze-independent BCI speller, has become a hot topic in recent years. It provides direct spelling device by non-muscular method for people with severe motor impairments and with limited gaze movement. Brain needs to conduct both stimuli-driven and stimuli-related attention in fast presented BCI paradigms for such BCI speller applications. Few researchers studied the mechanism of brain response to such fast presented BCI applications. In this study, we compared the distribution of brain activation in visual, auditory, and audio-visual combined stimuli paradigms using sLORETA (standardized low-resolution brain electromagnetic tomography)...
July 2017: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/29051523/emotion-regulating-attentional-control-abnormalities-in-major-depressive-disorder-an-event-related-potential-study
#4
Bin Hu, Juan Rao, Xiaowei Li, Tong Cao, Jianxiu Li, Dennis Majoe, Jürg Gutknecht
Major depressive disorders (MDD) exhibit cognitive dysfunction with respect to attention. The deficiencies in cognitive control of emotional information are associated with MDD as compared to healthy controls (HC). However, the brain mechanism underlying emotion that influences the attentional control in MDD necessitates further research. The present study explores the emotion-regulated cognitive competence in MDD at a dynamic attentional stage. Event-Related Potentials (ERPs) were recorded from 35 clinical MDD outpatients and matched HCs by applying a modified affective priming dot-probe paradigm, which consisted of various emotional facial expression pairs...
October 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29044574/context-specific-inhibition-is-related-to-craving-in-alcohol-use-disorders-a-dangerous-imbalance
#5
Maria Stein, Werner Fey, Thomas Koenig, Jacqueline Oehy, Franz Moggi
BACKGROUND: Most contemporary neuroscientific models of alcohol use disorders (AUD) incorporate an imbalance between enhanced cue reactivity, which results in a strong urge to consume, and the impaired inhibitory control of that urge. While these phenomena have been frequently investigated separately, studies involving both aspects and thus precisely investigating the postulated imbalance are rare. In this study, inhibition was investigated in an addiction-specific context and individual craving levels were also examined...
October 16, 2017: Alcoholism, Clinical and Experimental Research
https://www.readbyqxmd.com/read/28891505/sleep-microstructure-dynamics-and-neurocognitive-performance-in-obstructive-sleep-apnea-syndrome-patients
#6
Foroozan Karimzadeh, Mohammad Nami, Reza Boostani
The present study examined the relationship between the increment in cyclic alternating patterns (CAPs) in sleep electroencephalography and neurocognitive decline in obstructive Sleep Apnea Syndrome (OSAS) patients through source localization of the phase-A of CAPs. All-night polysomnographic recordings of 10 OSAS patients and 4 control subjects along with their cognitive profile using the Addenbrooke's Cognitive Examination (ACE) test were acquired. The neuropsychological assessment involved five key domains including attention and orientation, verbal fluency, memory, language and visuo-spatial skills...
2017: Journal of Integrative Neuroscience
https://www.readbyqxmd.com/read/28813949/monitoring-brain-potentials-to-guide-neurorehabilitation-of-tracking-impairments
#7
Boris Yazmir, Miriam Reiner
Motor impairments come in different forms. One class of motor impairments, relates to accuracy of tracking a moving object, as, for instance, when chasing in an attempt to catch it. Here we look at neural signals associated with errors in tracking, and the implications for brain-computer-interfaces that target impairment-tailored rehabilitation. As a starting point, we characterized EEG signals evoked by tracking errors during continuous natural motion, in healthy participants. Participants played a virtual 3D, ecologically valid haptic tennis game, and had to track a moving tennis ball in order to hit and send the ball towards the opponent's court...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28808819/separating-the-idea-from-the-action-a-sloreta-study
#8
Martin Rakusa, Pierpaolo Busan, Piero Paolo Battaglini, Janez Zidar
Simple imaginary movements activate similar cortical and subcortical areas to actual movements, chiefly in the sensory-motor network. However, only a few studies also examined the imagery of more skilful movements such as reaching. Ten volunteers performed reaching movements or imagined the same movements. EEG was simultaneously recorded and analysed with sLORETA, which compared the preparation for actual and imagined reaching with respect to their baseline and between tasks. Major differences between them were found at three time intervals after target presentation, always in favour of the actual reaching condition...
August 14, 2017: Brain Topography
https://www.readbyqxmd.com/read/28734112/fused-multivariate-empirical-mode-decomposition-memd-and-inverse-solution-method-for-eeg-source-localization
#9
Pegah Khosropanah, Abdul Rahman Ramli, Kheng Seang Lim, Mohammad Hamiruce Marhaban, Anvarjon Ahmedov
EEG source localization is determining possible cortical sources of brain activities with scalp EEG. Generally, every step of the data processing sequence affects the accuracy of EEG source localization. In this paper, we introduce a fused multivariate empirical mode decomposing (MEMD) and inverse solution algorithm with an embedded unsupervised eye blink remover in order to localize the epileptogenic zone accurately. For this purpose, we constructed realistic forward models using MRI and boundary element method (BEM) for each patient to obtain results that are more realistic...
July 22, 2017: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/28710556/visual-mismatch-negativity-vmmn-for-low-and-high-level-deviances-a-control-study
#10
Domonkos File, Bálint File, Flóra Bodnár, István Sulykos, Krisztina Kecskés-Kovács, István Czigler
The aim of our studies was to separate the effects of violating a sequential rule (genuine visual mismatch negativity; gvMMN) from the decreased activity in response to repeated stimuli (stimulus-specific adaptation; SSA) for simple and more complex stimuli. To accomplish this goal, different control procedures were applied with the aim of finding the correct control for vMMN studies. Event-related brain electric activity (ERPs) was measured in response to nonattended visual stimuli that were presented either in an oddball manner or in various control sequences...
October 2017: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/28698594/semantic-congruent-audiovisual-integration-during-the-encoding-stage-of-working-memory-an-erp-and-sloreta-study
#11
Yuanjun Xie, Yuanyuan Xu, Chen Bian, Min Li
Although multisensory integration is an inherent component of functional brain organization, multisensory integration during working memory (WM) has attracted little attention. The present study investigated the neural properties underlying the multisensory integration of WM by comparing semantically related bimodal stimulus presentations with unimodal stimulus presentations and analysing the results using the standardized low-resolution brain electromagnetic tomography (sLORETA) source location approach. The results showed that the memory retrieval reaction times during congruent audiovisual conditions were faster than those during unisensory conditions...
July 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28686002/cerebrocortical-activity-during-self-paced-exercise-in-temperate-hot-and-hypoxic-conditions
#12
Julien D Périard, Kevin De Pauw, Frank Zanow, Sébastien Racinais
AIM: Heat stress and hypoxia independently influence cerebrocortical activity and impair prolonged exercise performance. This study examined the relationship between electroencephalography (EEG) activity and self-paced exercise performance in control (CON, 18°C, 40% RH), hot (HOT, 35°C, 60%RH) and hypoxic (HYP, 18°C, 40%RH FiO2 : 0.145) conditions. METHODS: Eleven well-trained cyclists completed a 750 kJ cycling time trial in each condition on separate days in a counter-balanced order...
July 7, 2017: Acta Physiologica
https://www.readbyqxmd.com/read/28677591/a-realistic-multimodal-modeling-approach-for-the-evaluation-of-distributed-source-analysis-application-to-sloreta
#13
D Cosandier-Rimélé, G Ramantani, J Zentner, A Schulze-Bonhage, M Dümpelmann
OBJECTIVE: Electrical source localization (ESL) deriving from scalp EEG and, in recent years, from intracranial EEG (iEEG), is an established method in epilepsy surgery workup. We aimed to validate the distributed ESL derived from scalp EEG and iEEG, particularly regarding the spatial extent of the source, using a realistic epileptic spike activity simulator. APPROACH: ESL was applied to the averaged scalp EEG and iEEG spikes of two patients with drug-resistant structural epilepsy...
October 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28648913/the-effects-of-analgesics-on-central-processing-of-tonic-pain-a%C3%A2-cross-over-placebo-controlled-study
#14
Dina Lelic, Tine M Hansen, Esben B Mark, Anne E Olesen, Asbjørn M Drewes
INTRODUCTION: Opioids and antidepressants that inhibit serotonin and norepinephrine reuptake (SNRI) are recognized as analgesics to treat moderate to severe pain, but the central mechanisms underlying their analgesia remain unclear. This study investigated how brain activity at rest and exposed to tonic pain is modified by oxycodone (opioid) and venlafaxine (SNRI). METHODS: Twenty healthy males were included in this randomized, cross-over, double-blinded study. 61-channel electroencephalogram (EEG) was recorded before and after five days of treatment with placebo, oxycodone (10 mg extended release b...
September 1, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28648714/evaluation-of-a-minimum-norm-based-beamforming-technique-sloreta-for-reducing-tonic-muscle-contamination-of-eeg-at-sensor-level
#15
Azin S Janani, Tyler S Grummett, Trent W Lewis, Sean P Fitzgibbon, Emma M Whitham, Dylan DelosAngeles, Hanieh Bakhshayesh, John O Willoughby, Kenneth J Pope
BACKGROUND: Cranial and cervical muscle activity (electromyogram, EMG) contaminates the surface electroencephalogram (EEG) from frequencies below 20 through to frequencies above 100Hz. It is not possible to have a reliable measure of cognitive tasks expressed in EEG at gamma-band frequencies until the muscle contamination is removed. NEW METHOD: In the present work, we introduce a new approach of using a minimum-norm based beamforming technique (sLORETA) to reduce tonic muscle contamination at sensor level...
June 23, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28619655/comparison-of-the-spatial-resolution-of-source-imaging-techniques-in-high-density-eeg-and-meg
#16
T Hedrich, G Pellegrino, E Kobayashi, J M Lina, C Grova
BACKGROUND: The present study aims at evaluating and comparing electrical and magnetic distributed source imaging methods applied to high-density Electroencephalography (hdEEG) and Magnetoencephalography (MEG) data. We used resolution matrices to characterize spatial resolution properties of Minimum Norm Estimate (MNE), dynamic Statistical Parametric Mapping (dSPM), standardized Low-Resolution Electromagnetic Tomography (sLORETA) and coherent Maximum Entropy on the Mean (cMEM, an entropy-based technique)...
June 13, 2017: NeuroImage
https://www.readbyqxmd.com/read/28602145/neural-correlate-of-internet-use-in-patients-undergoing-psychological-treatment-for-internet-addiction
#17
Carlo Lai, Daniela Altavilla, Marianna Mazza, Silvia Scappaticci, Renata Tambelli, Paola Aceto, Massimiliano Luciani, Stefano Corvino, David Martinelli, Flaminia Alimonti, Federico Tonioni
BACKGROUND: The new version of Diagnostic and Statistical Manual of Mental Disorders (DSM-5th) proposed the Internet Gaming Disorder for the diagnosis of Internet addiction (IA) considering the neurobiological evidence of the craving. AIMS: The aim was to test the neural correlate in response to the Internet cue in patients with IA. METHODS: Sixteen males with IA diagnosis (clinical group) and 14 healthy male (control group) were recruited for an experimental visual task composed of Internet images and emotional images...
June 2017: Journal of Mental Health
https://www.readbyqxmd.com/read/28600639/double-dissociation-between-the-neural-correlates-of-the-general-and-specific-factors-of-the-life-orientation-test-revised
#18
Guido Alessandri, Vilfredo De Pascalis
In this article, we explore the neural correlates of the general and specific factors assessed by the Life Orientation Test-Revised. These factors have been shown to assess general optimism (GO) and a form of self-enhancement akin to unrealistic optimism (SP). Toward our aim, we used a standardized low-resolution brain electromagnetic tomography (sLORETA), which provides electroencephalographic (EEG) localization measures that are independent of recording reference. Resting-EEG and self-report measures of GO and SP were collected from 51 female undergraduates...
October 2017: Cognitive, Affective & Behavioral Neuroscience
https://www.readbyqxmd.com/read/28480811/changes-in-brain-activation-during-sedation-induced-by-dexmedetomidine
#19
Won-Ho Kim, Dongrae Cho, Boreom Lee, Jae-Jin Song, Teo Jeon Shin
Objective Dexmedetomidine (DEX) has been widely used as a sedative, acting as an α2-adrenergic agonist on autoreceptors, presynaptic receptors and postsynaptic receptors without risk of respiratory depression. Although consciousness impairment is closely related to disturbances of brain function in different frequency bands, the time-varying DEX effects on cortical activity in specific frequency bands has not yet been studied. Methods We used electroencephalography (EEG) to analyse differences in cerebral cortex activity between the awake and sedated states, using electromagnetic tomography (standardized low resolution electromagnetic tomography (sLORETA)) to localize multiple channel scalp recordings of cerebral electric activity to specific brain regions...
June 2017: Journal of International Medical Research
https://www.readbyqxmd.com/read/28466144/comparative-analysis-of-background-eeg-activity-in-childhood-absence-epilepsy-during-valproate-treatment-a-standardized-low-resolution-brain-electromagnetic-tomography-sloreta-study
#20
Jung-Hyun Shin, Tae-Hoon Eom, Young-Hoon Kim, Seung-Yun Chung, In-Goo Lee, Jung-Min Kim
Valproate (VPA) is an antiepileptic drug (AED) used for initial monotherapy in treating childhood absence epilepsy (CAE). EEG might be an alternative approach to explore the effects of AEDs on the central nervous system. We performed a comparative analysis of background EEG activity during VPA treatment by using standardized, low-resolution, brain electromagnetic tomography (sLORETA) to explore the effect of VPA in patients with CAE. In 17 children with CAE, non-parametric statistical analyses using sLORETA were performed to compare the current density distribution of four frequency bands (delta, theta, alpha, and beta) between the untreated and treated condition...
July 2017: Neurological Sciences
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