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https://www.readbyqxmd.com/read/28800340/reducing-the-rate-of-misdiagnosis-in%C3%A2-patients-with-chronic-disorders-of%C3%A2-consciousness-is-there-a-place-for-audiovisual-stimulation
#1
Antonino Naro, Antonino Leo, Rocco Bruno, Antonino Cannavò, Antonio Buda, Alfredo Manuli, Alessia Bramanti, Placido Bramanti, Rocco Salvatore Calabrò
BACKGROUND: The patients with chronic Disorders of Consciousness (DoC) mostly present with extremely challenging differential diagnosis. The advanced analysis of electroencephalographic (EEG) signals induced by brain stimulation paradigms may provide an appropriate approach to differentiate patients with DoC, besides the clinical assessment. OBJECTIVE: This study was performed with an objective of identifying residual brain network perturbations following an innovative, non-invasive audiovisual stimulation protocol, which could be related to behavioral responsiveness in patients with DoC...
August 11, 2017: Restorative Neurology and Neuroscience
https://www.readbyqxmd.com/read/28798677/measurement-of-the-perception-of-control-during-continuous-movement-using-electroencephalography
#2
Wen Wen, Atsushi Yamashita, Hajime Asama
"Sense of control" refers to the subjective feeling of control over external events. Numerous neuropsychological studies have investigated the neural basis of the sense of control during action performance; however, most previous studies have focused on responses to a single discrete action outcome rather than real-time processing of action-outcome sequences. In the present study, we aimed to identify whether certain patterns of brain activation are associated with the perceived control during continuous movement...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28797109/upper-limb-movements-can-be-decoded-from-the-time-domain-of-low-frequency-eeg
#3
Patrick Ofner, Andreas Schwarz, Joana Pereira, Gernot R Müller-Putz
How neural correlates of movements are represented in the human brain is of ongoing interest and has been researched with invasive and non-invasive methods. In this study, we analyzed the encoding of single upper limb movements in the time-domain of low-frequency electroencephalography (EEG) signals. Fifteen healthy subjects executed and imagined six different sustained upper limb movements. We classified these six movements and a rest class and obtained significant average classification accuracies of 55% (movement vs movement) and 87% (movement vs rest) for executed movements, and 27% and 73%, respectively, for imagined movements...
2017: PloS One
https://www.readbyqxmd.com/read/28790884/the-effect-of-electroencephalogram-eeg-reference-choice-on-information-theoretic-measures-of-the-complexity-and-integration-of-eeg-signals
#4
Logan T Trujillo, Candice T Stanfield, Ruben D Vela
Converging evidence suggests that human cognition and behavior emerge from functional brain networks interacting on local and global scales. We investigated two information-theoretic measures of functional brain segregation and integration-interaction complexity C I (X), and integration I(X)-as applied to electroencephalographic (EEG) signals and how these measures are affected by choice of EEG reference. CI(X) is a statistical measure of the system entropy accounted for by interactions among its elements, whereas I(X) indexes the overall deviation from statistical independence of the individual elements of a system...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28782865/deep-learning-with-convolutional-neural-networks-for-eeg-decoding-and-visualization
#5
Robin Tibor Schirrmeister, Jost Tobias Springenberg, Lukas Dominique Josef Fiederer, Martin Glasstetter, Katharina Eggensperger, Michael Tangermann, Frank Hutter, Wolfram Burgard, Tonio Ball
Deep learning with convolutional neural networks (deep ConvNets) has revolutionized computer vision through end-to-end learning, that is, learning from the raw data. There is increasing interest in using deep ConvNets for end-to-end EEG analysis, but a better understanding of how to design and train ConvNets for end-to-end EEG decoding and how to visualize the informative EEG features the ConvNets learn is still needed. Here, we studied deep ConvNets with a range of different architectures, designed for decoding imagined or executed tasks from raw EEG...
August 7, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28782683/unidirectional-brain-to-muscle-connectivity-reveals-motor-cortex-control-of-leg-muscles-during-stereotyped-walking
#6
Fiorenzo Artoni, Chiara Fanciullacci, Federica Bertolucci, Alessandro Panarese, Scott Makeig, Silvestro Micera, Carmelo Chisari
In lower mammals, locomotion seems to be mainly regulated by subcortical and spinal networks. On the contrary, recent evidence suggests that in humans the motor cortex is also significantly engaged during complex locomotion tasks. However, a detailed understanding of cortical contribution to locomotion is still lacking especially during stereotyped activities. Here, we show that cortical motor areas finely control leg muscle activation during treadmill stereotyped walking. Using a novel technique based on a combination of Reliable Independent Component Analysis, source localization and effective connectivity, and by combining electroencephalographic (EEG) and electromyographic (EMG) recordings in able-bodied adults we were able to examine for the first time cortical activation patterns and cortico-muscular connectivity including information flow direction...
August 4, 2017: NeuroImage
https://www.readbyqxmd.com/read/28774647/discrimination-of-a-medial-functional-module-within-the-temporal-lobe-using-an-effective-connectivity-model-a-ccep-study
#7
Julien Krieg, Laurent Koessler, Jacques Jonas, Sophie Colnat-Coulbois, Jean-Pierre Vignal, Christian G Bénar, Louis G Maillard
The temporal lobe is classically divided in two functional systems: the ventral visual pathway and the medial temporal memory system. However, their functional separation has been challenged by studies suggesting that the medial temporal lobe could be best understood as an extension of the hierarchically organized ventral visual pathway. Our purpose was to investigate (i) whether cerebral regions within the temporal lobe could be grouped into distinct functional assemblies, and (ii) which regions were central within these functional assemblies...
July 31, 2017: NeuroImage
https://www.readbyqxmd.com/read/28770364/inter-study-and-inter-individual-consistency-and-variability-of-eeg-erp-microstate-sequences-in-referential-word-production
#8
Marina Laganaro
Periods of stable global electric field at scalp unfolding during a cognitive task can be linked to brain processes and are therefore well suited to investigate simultaneously qualitative and quantitative differences across conditions or populations of interest. The electrophysiological event-related (ERP) spatio-temporal dynamic has been repetitively investigated in referential word production, but the different designs, settings and analyses do not allow to conclude on the reliability of the microstate sequences across studies and individuals...
August 2, 2017: Brain Topography
https://www.readbyqxmd.com/read/28769778/improving-cross-day-eeg-based-emotion-classification-using-robust-principal-component-analysis
#9
Yuan-Pin Lin, Ping-Keng Jao, Yi-Hsuan Yang
Constructing a robust emotion-aware analytical framework using non-invasively recorded electroencephalogram (EEG) signals has gained intensive attentions nowadays. However, as deploying a laboratory-oriented proof-of-concept study toward real-world applications, researchers are now facing an ecological challenge that the EEG patterns recorded in real life substantially change across days (i.e., day-to-day variability), arguably making the pre-defined predictive model vulnerable to the given EEG signals of a separate day...
2017: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/28768447/neural-oscillation-correlates-chemistry-decision-making
#10
Li-Yu Huang, Hsiao-Ching She, Tzyy-Ping Jung
This study explored the electroencephalography (EEG) dynamics during a chemistry-related decision-making task and further examined whether the correctness of the decision-making performance could be reflected by EEG activity. A total of 66 undergraduate students' EEG were collected while they participated in a chemistry-related decision-making task in which they had to retrieve the relevant chemistry concepts in order to make correct decisions for each task item. The results showed that it was only in the anterior cingulate cortex (ACC) cluster that distinct patterns in EEG dynamics were displayed for the correct and incorrect responses...
May 7, 2017: International Journal of Neural Systems
https://www.readbyqxmd.com/read/28765057/decoding-cognitive-concepts-from-neuroimaging-data-using-multivariate-pattern-analysis
#11
Sarah Alizadeh, Hamidreza Jamalabadi, Monika Schönauer, Christian Leibold, Steffen Gais
Multivariate pattern analysis (MVPA) methods are now widely used in life-science research. They have great potential but their complexity also bears unexpected pitfalls. In this paper, we explore the possibilities that arise from the high sensitivity of MVPA for stimulus-related differences, which may confound estimations of class differences during decoding of cognitive concepts. We propose a method that takes advantage of concept-unrelated grouping factors, uses blocked permutation tests, and gradually manipulates the proportion of concept-related information in data while the stimulus-related, concept-irrelevant factors are held constant...
July 29, 2017: NeuroImage
https://www.readbyqxmd.com/read/28763679/multivariate-pattern-analysis-of-event-related-potentials-predicts-the-subjective-relevance-of-everyday-objects
#12
William Francis Turner, Phillip Johnston, Kathleen de Boer, Carmen Morawetz, Stefan Bode
Potentially decision-relevant stimuli have been proposed to undergo immediate semantic processing. The current study investigated whether information regarding the general desirability ('Wanting') of visually presented 'everyday' objects was rapidly and automatically processed. Participants completed a foreground task while their electroencephalogram (EEG) was recorded, and task-irrelevant images were presented in the background. Following this, participants rated the images with regards to Wanting and the potentially related attributes of Relevance, Familiarity, Aesthetic Pleasantness and Time Reference...
July 29, 2017: Consciousness and Cognition
https://www.readbyqxmd.com/read/28762609/postural-change-in-convulsive-seizures-a-retrospective-review-of-video-eeg-recordings
#13
Jane Rigg, Kimberley Irwin, Fred Tremayne, David Reutens
OBJECTIVES: Prone position has been identified as an important risk factor for Sudden Unexpected Death in Epilepsy (SUDEP) raising the possibility of avoidance of this posture in sleep as a preventative measure. To evaluate the potential utility of such postural measures, we studied patterns of postural change during generalised tonic clonic seizures (GTCSs). METHODS: Video electroencephalographic (video-EEG) recordings for patients undergoing investigations at the Royal Brisbane and Women's Hospital between 2005 and 2013 were reviewed independently by two raters...
August 1, 2017: Internal Medicine Journal
https://www.readbyqxmd.com/read/28762286/childhood-onset-epileptic-encephalopathy-associated-with-isolated-focal-cortical-dysplasia-and-a-novel-tsc1-germline-mutation
#14
Hannes Hoelz, Eva Coppenrath, Konstanze Hoertnagel, Timo Roser, Moritz Tacke, Lucia Gerstl, Ingo Borggraefe
Tuberous sclerosis complex (TSC) is an autosomal-dominant inheritable neurocutaneous disease due to mutations within the TSC1 and TSC2 genes. Many patients present with West syndrome, a severe epilepsy syndrome characterized by the triad of infantile spasms, an interictal electroencephalogram (EEG) pattern termed hypsarrhythmia (continuous slow activity with an amplitude higher than 300 µV and multiregional spikes/polyspikes/sharp waves) and developmental regression. In this study, we report on a previously healthy patient with positive family history of epilepsy with new-onset epileptic encephalopathy at the age of 9 years...
March 1, 2017: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/28757195/selective-entrainment-of-brain-oscillations-drives-auditory-perceptual-organization
#15
Jordi Costa-Faidella, Elyse S Sussman, Carles Escera
Perceptual sound organization supports our ability to make sense of the complex acoustic environment, to understand speech and to enjoy music. However, the neuronal mechanisms underlying the subjective experience of perceiving univocal auditory patterns that can be listened to, despite hearing all sounds in a scene, are poorly understood. We hereby investigated the manner in which competing sound organizations are simultaneously represented by specific brain activity patterns and the way attention and task demands prime the internal model generating the current percept...
July 27, 2017: NeuroImage
https://www.readbyqxmd.com/read/28756349/interrater-agreement-in-visual-scoring-of-neonatal-seizures-based-on-majority-voting-on-a-web-based-system-the-neoguard-eeg-database
#16
Anneleen Dereymaeker, Amir H Ansari, Katrien Jansen, Perumpillichira J Cherian, Jan Vervisch, Paul Govaert, Leen De Wispelaere, Charlotte Dielman, Vladimir Matic, Alexander Caicedo Dorado, Maarten De Vos, Sabine Van Huffel, Gunnar Naulaers
OBJECTIVE: To assess interrater agreement based on majority voting in visual scoring of neonatal seizures. METHODS: An online platform was designed based on a multicentre seizure EEG-database. Consensus decision based on 'majority voting' and interrater agreement was estimated using Fleiss' Kappa. The influences of different factors on agreement were determined. RESULTS: 1919 Events extracted from 280h EEG of 71 neonates were reviewed by 4 raters...
July 12, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28753456/synaptic-damage-underlies-eeg-abnormalities-in-postanoxic-encephalopathy-a-computational-study
#17
B J Ruijter, J Hofmeijer, H G E Meijer, M J A M van Putten
OBJECTIVE: In postanoxic coma, EEG patterns indicate the severity of encephalopathy and typically evolve in time. We aim to improve the understanding of pathophysiological mechanisms underlying these EEG abnormalities. METHODS: We used a mean field model comprising excitatory and inhibitory neurons, local synaptic connections, and input from thalamic afferents. Anoxic damage is modeled as aggravated short-term synaptic depression, with gradual recovery over many hours...
July 8, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28753449/attentional-avoidance-of-threats-in-obsessive-compulsive-disorder-an-event-related-potential-study
#18
Zhong-Ming Zhang, Meng-Yun Wang, Xiaowei Guo, Xiaocui Miao, Ting Zhang, Dong Gao, Zhen Yuan
The neural mechanism underlying attentional bias in OCD (Obsessive-Compulsive Disorder) remains unclear. The goal of this study was to examine and compare the time course and the event related potential (ERP) components in OCD patients and healthy controls (HC) to reveal the complex brain activation pattern associated with attentional bias in OCD. The behavioural and electroencephalogram (EEG) data were recorded while the participants performed an emotional Stroop task. Compared to HC, the individuals with OCD exhibited slower response time, prolonged N1 latency and larger N1 and P2 amplitudes across different emotional words...
July 20, 2017: Behaviour Research and Therapy
https://www.readbyqxmd.com/read/28750884/predictive-value-of-eeg-in-postanoxic-encephalopathy-a-quantitative-model-based-approach
#19
Evdokia Efthymiou, Roland Renzel, Christian R Baumann, Rositsa Poryazova, Lukas L Imbach
INTRODUCTION: The majority of comatose patients after cardiac arrest do not regain consciousness due to severe postanoxic encephalopathy. Early and accurate outcome prediction is therefore essential in determining further therapeutic interventions. The electroencephalogram is a standardized and commonly available tool used to estimate prognosis in postanoxic patients. The identification of pathological EEG patterns with poor prognosis relies however primarily on visual EEG scoring by experts...
July 24, 2017: Resuscitation
https://www.readbyqxmd.com/read/28749594/seizure-activity-per-se-does-not-induce-tissue-damage-markers-in-human-neocortical-focal-epilepsy
#20
Laura Rossini, Rita Garbelli, Vadym Gnatkovsky, Giuseppe Didato, Flavio Villani, Roberto Spreafico, Francesco Deleo, Giorgio Lo Russo, Giovanni Tringali, Francesca Gozzo, Laura Tassi, Marco de Curtis
Objective The contribute of recurring seizures to the progression of epileptogenesis is debated. Seizure-induced brain damage is not conclusively demonstrated both in humans and in animal models of epilepsy. We evaluated the expression of brain injury biomarkers on post-surgical brain tissue obtained from 20 patients with frequent seizures and a long history of drug-resistant focal epilepsy. Methods The expression patterns of specific glial, neuronal and inflammatory molecules was evaluated by immunohistochemistry in the core of type II focal cortical dysplasias (FCD-II), at the FCD boundary (perilesion) and in the adjacent normal-appearing area included in the epileptogenic region...
July 27, 2017: Annals of Neurology
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