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https://www.readbyqxmd.com/read/29147144/effects-of-spectral-smearing-of-stimuli-on-the-performance-of-auditory-steady-state-response-based-brain-computer-interface
#1
Jong Ho Hwang, Kyoung Won Nam, Dong Pyo Jang, In Young Kim
There have been few reports that investigated the effects of the degree and pattern of a spectral smearing of stimuli due to deteriorated hearing ability on the performance of auditory brain-computer interface (BCI) systems. In this study, we assumed that such spectral smearing of stimuli may affect the performance of an auditory steady-state response (ASSR)-based BCI system and performed subjective experiments using 10 normal-hearing subjects to verify this assumption. We constructed smearing-reflected stimuli using an 8-channel vocoder with moderate and severe hearing loss setups and, using these stimuli, performed subjective concentration tests with three symmetric and six asymmetric smearing patterns while recording electroencephalogram signals...
December 2017: Cognitive Neurodynamics
https://www.readbyqxmd.com/read/29147143/analyzing-text-recognition-from-tactually-evoked-eeg
#2
A Khasnobish, S Datta, R Bose, D N Tibarewala, A Konar
Tactual exploration of objects produce specific patterns in the human brain and hence objects can be recognized by analyzing brain signals during tactile exploration. The present work aims at analyzing EEG signals online for recognition of embossed texts by tactual exploration. EEG signals are acquired from the parietal region over the somatosensory cortex of blindfolded healthy subjects while they tactually explored embossed texts, including symbols, numbers, and alphabets. Classifiers based on the principle of supervised learning are trained on the extracted EEG feature space, comprising three features, namely, adaptive autoregressive parameters, Hurst exponents, and power spectral density, to recognize the respective texts...
December 2017: Cognitive Neurodynamics
https://www.readbyqxmd.com/read/29145168/frontal-infraslow-activity-marks-the-motor-spasms-of-anti-lgi1-encephalitis
#3
Richard Wennberg, Claude Steriade, Robert Chen, Danielle Andrade
OBJECTIVE: The clinical and electrographic features of seizures in anti-LGI1 encephalitis are distinct from those seen in other autoimmune encephalitides or non-encephalitic epilepsies. One electroclinical phenomenon specific to the condition consists of lateralized motor spasms, known as faciobrachial dystonic seizures (FBDS). An electrodecremental pattern overriding a "DC shift" has been described as the EEG correlate of these spasms. We sought to further characterize this pre-spasm infraslow activity (ISA)...
October 28, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29143207/contribution-of-eeg-in-transient-neurological-deficits
#4
Pierre Lozeron, Nadine Carole Tcheumeni, Sahar Turki, Hélène Amiel, Elodie Meppiel, Sana Masmoudi, Caroline Roos, Isabelle Crassard, Patrick Plaisance, Houria Benbetka, Jean-Pierre Guichard, Emmanuel Houdart, Hélène Baudoin, Nathalie Kubis
Identification of stroke mimics and 'chameleons' among transient neurological deficits (TND) is critical. Diagnostic workup consists of a brain imaging study, for a vascular disease or a brain tumour and EEG, for epileptiform discharges. The precise role of EEG in this diagnostic workup has, however, never been clearly delineated. However, this could be crucial in cases of atypical or incomplete presentation with consequences on disease management and treatment. We analysed the EEG patterns on 95 consecutive patients referred for an EEG within 7 days of a TND with diagnostic uncertainty...
November 15, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/29143096/-neurofeedback-for-the-treatment-of-chronic-tinnitus-review-and-future-perspectives
#5
REVIEW
T Kleinjung, C Thüring, D Güntensperger, P Neff, M Meyer
Neurofeedback is a noninvasive neuromodulation technique employing real-time display of brain activity in terms of electroencephalography (EEG) signals to teach self-regulation of distinct patterns of brain activity or influence brain activity in a targeted manner. The benefit of this approach for control of symptoms in attention deficit disorders, hyperactivity, depression, and migraine has been proven. Studies in recent years have also repeatedly shown this treatment to improve tinnitus symptoms, although it has not become established as routine therapy...
November 15, 2017: HNO
https://www.readbyqxmd.com/read/29142097/fast-oscillation-dynamics-during-hypsarrhythmia-as-a-localization-biomarker
#6
Min-Jee Kim, Mi-Sun Yum, Hye-Ryun Yeh, Tae-Sung Ko
Hypsarrhythmia in West syndrome, although hard to define, is characterized by chaotic and disorganized electrical activity of the brain and is often regarded as a generalized EEG pattern without any localization value. Using event-related spectral perturbation (ERSP), we tried to determine the brain dynamics during hypsarrhythmia. Routine 1-h scalp EEGs were retrieved from 31 patients with infantile spasms and 20 age-matched controls. Using the EEGLAB toolbox of MATLAB 2015b, the ERSPs of fast oscillations (FOs; 20-100 Hz) of selected channels were analyzed and compared among groups according to their MRI lesions...
November 15, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29139014/the-ictal-interictal-continuum-to-treat-or-not-to-treat-and-how
#7
Clio Rubinos, Alexandra S Reynolds, Jan Claassen
Continuous electroencephalography (cEEG) monitoring is becoming increasingly used in neurologic and non-neurologic intensive care units (ICUs). Non-convulsive seizures (NCSz) and periodic discharges (PDs) are commonly seen in critically ill patients. Some of these PD patterns, also known as the ictal-interictal continuum (IIC), are associated with an increased risk of seizures and poor outcome. However, we do not fully understand the significance of these periodic patterns and the decision of how aggressively to treat remains controversial...
November 14, 2017: Neurocritical Care
https://www.readbyqxmd.com/read/29138310/sparsity-enables-estimation-of-both-subcortical-and-cortical-activity-from-meg-and-eeg
#8
Pavitra Krishnaswamy, Gabriel Obregon-Henao, Jyrki Ahveninen, Sheraz Khan, Behtash Babadi, Juan Eugenio Iglesias, Matti S Hämäläinen, Patrick L Purdon
Subcortical structures play a critical role in brain function. However, options for assessing electrophysiological activity in these structures are limited. Electromagnetic fields generated by neuronal activity in subcortical structures can be recorded noninvasively, using magnetoencephalography (MEG) and electroencephalography (EEG). However, these subcortical signals are much weaker than those generated by cortical activity. In addition, we show here that it is difficult to resolve subcortical sources because distributed cortical activity can explain the MEG and EEG patterns generated by deep sources...
November 14, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29136131/characteristic-increases-in-eeg-connectivity-correlate-with-changes-of-structural-mri-in-amyotrophic-lateral-sclerosis
#9
Bahman Nasseroleslami, Stefan Dukic, Michael Broderick, Kieran Mohr, Christina Schuster, Brighid Gavin, Russell McLaughlin, Mark Heverin, Alice Vajda, Parameswaran M Iyer, Niall Pender, Peter Bede, Edmund C Lalor, Orla Hardiman
Amyotrophic lateral sclerosis (ALS) is a terminal progressive adult-onset neurodegeneration of the motor system. Although originally considered a pure motor degeneration, there is increasing evidence of disease heterogeneity with varying degrees of extra-motor involvement. How the combined motor and nonmotor degeneration occurs in the context of broader disruption in neural communication across brain networks has not been well characterized. Here, we have performed high-density crossectional and longitudinal resting-state electroencephalography (EEG) recordings on 100 ALS patients and 34 matched controls, and have identified characteristic patterns of altered EEG connectivity that have persisted in longitudinal analyses...
November 9, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29134143/eeg-sensorimotor-rhythms-variation-and-functional-connectivity-measures-during-motor-imagery-linear-relations-and-classification-approaches
#10
Carlos A Stefano Filho, Romis Attux, Gabriela Castellano
Hands motor imagery (MI) has been reported to alter synchronization patterns amongst neurons, yielding variations in the mu and beta bands' power spectral density (PSD) of the electroencephalography (EEG) signal. These alterations have been used in the field of brain-computer interfaces (BCI), in an attempt to assign distinct MI tasks to commands of such a system. Recent studies have highlighted that information may be missing if knowledge about brain functional connectivity is not considered. In this work, we modeled the brain as a graph in which each EEG electrode represents a node...
2017: PeerJ
https://www.readbyqxmd.com/read/29133062/anatomical-and-physiological-basis-of-continuous-spike-wave-of-sleep-syndrome-after-early-thalamic-lesions
#11
Alberto Leal, Eulália Calado, José P Vieira, Carla Mendonça, José C Ferreira, Hugo Ferreira, Daniel Carvalho, Fátima Furtado, Roseli Gomes, José P Monteiro
OBJECTIVE: Early neonatal thalamic lesions account for about 14% of continuous spike-wave of sleep (CSWS) syndrome, representing the most common etiology in this epileptic encephalopathy in children, and promise useful insights into the pathophysiology of the disease. METHODS: We describe nine patients with unilateral neonatal thalamic lesions which progressed to CSWS. Longitudinal whole-night and high-density electroencephalograms (EEGs) were performed, as well as detailed imaging and clinical evaluation...
November 10, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29130824/longitudinal-structural-and-functional-differences-between-proportional-and-poor-motor-recovery-after-stroke
#12
Adrian G Guggisberg, Pierre Nicolo, Leonardo G Cohen, Armin Schnider, Ethan R Buch
BACKGROUND: Evolution of motor function during the first months after stroke is stereotypically bifurcated, consisting of either recovery to about 70% of maximum possible improvement ("proportional recovery, PROP") or in little to no improvement ("poor recovery, POOR"). There is currently no evidence that any rehabilitation treatment will prevent POOR and favor PROP. OBJECTIVE: To perform a longitudinal and multimodal assessment of functional and structural changes in brain organization associated with PROP...
November 1, 2017: Neurorehabilitation and Neural Repair
https://www.readbyqxmd.com/read/29130493/trajectories-of-resting-frontal-brain-activity-and-psychopathology-in-female-adolescents-exposed-to-child-maltreatment
#13
Alva Tang, Vladimir Miskovic, Ayelet Lahat, Masako Tanaka, Harriet MacMillan, Ryan J Van Lieshout, Louis A Schmidt
Resting frontal electroencephalogram (EEG) alpha asymmetry patterns reflecting different affective and motivational tendencies have been proposed as a putative mechanism underlying resilience among maltreated youth. This 2-year prospective study examined whether developmental stability of resting frontal alpha asymmetry moderated the relation between child maltreatment severity and psychopathology in female adolescents (n = 43; ages 12-16) recruited from child protection agencies. Results identified two trajectories of resting frontal asymmetry: 60...
November 12, 2017: Developmental Psychobiology
https://www.readbyqxmd.com/read/29129536/event-boundaries-trigger-rapid-memory-reinstatement-of-the-prior-events-to-promote-their-representation-in-long-term-memory
#14
Ignasi Sols, Sarah DuBrow, Lila Davachi, Lluís Fuentemilla
Although everyday experiences unfold continuously over time, shifts in context, or event boundaries, can influence how those events come to be represented in memory [1-4]. Specifically, mnemonic binding across sequential representations is more challenging at context shifts, such that successful temporal associations are more likely to be formed within than across contexts [1, 2, 5-9]. However, in order to preserve a subjective sense of continuity, it is important that the memory system bridge temporally adjacent events, even if they occur in seemingly distinct contexts...
November 4, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/29129160/visual-but-not-motor-processes-predict-simple-visuomotor-reaction-time-of-badminton-players
#15
Thorben Hülsdünker, Heiko K Strüder, Andreas Mierau
The athlete's brain exhibits significant functional adaptations that facilitate visuomotor reaction performance. However, it is currently unclear if the same neurophysiological processes that differentiate athletes from non-athletes also determine performance within a homogeneous group of athletes. This information can provide valuable help for athletes and coaches aiming to optimize existing training regimes. Therefore, this study aimed to identify the neurophysiological correlates of visuomotor reaction performance in a group of skilled athletes...
November 12, 2017: European Journal of Sport Science
https://www.readbyqxmd.com/read/29125945/periodic-eeg-patterns-in-sporadic-creutzfeld-jakob-disease-can-be-benzodiazepine-responsive-and-be-difficult-to-distinguish-from-non-convulsive-status-epilepticus
#16
Justus Marquetand, Susanne Knake, Adam Strzelczyk, Bernhard J Steinhoff, Holger Lerche, Matthis Synofzik, Niels K Focke
PURPOSE: Periodic discharges in EEG and a history of rapidly progressive dementia are known to be associated with sporadic Creutzfeld-Jakob Disease (sCJD). Doubts regarding this rare but fatal diagnosis can arise, when episodic symptoms (seizures, psychiatric features, speech disturbances) are present and the EEG shows epileptiform discharges within this periodicity. This scenario may indicate non-convulsive status epilepticus (NCSE), which is - in contrast to sCJD - a treatable and frequent condition...
November 4, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/29124439/lennox-gastaut-syndrome-a-comprehensive-review
#17
Ali A Asadi-Pooya
Lennox-Gastaut syndrome (LGS) is considered an epileptic encephalopathy and is defined by a triad of multiple drug-resistant seizure types, a specific EEG pattern showing bursts of slow spike-wave complexes or generalized paroxysmal fast activity, and intellectual disability. The prevalence of LGS is estimated between 1 and 2% of all patients with epilepsy. The etiology of LGS is often divided into two groups: identifiable (genetic-structural-metabolic) in 65 to 75% of the patients and LGS of unknown cause in others...
November 9, 2017: Neurological Sciences
https://www.readbyqxmd.com/read/29122649/the-impact-of-global-hemodynamics-oxygen-and-carbon-dioxide-on-epileptiform-eeg-activity-in-comatose-survivors-of-out-of-hospital-cardiac-arrest
#18
C Moonen, R Lemmens, W Van Paesschen, A Wilmer, W Eertmans, B Ferdinande, M Dupont, C De Deyne, J Dens, S Janssens, K Ameloot
AIM: To study the association between global hemodynamics, blood gases, epileptiform EEG activity and survival after out-of-hospital CA (0HCA). METHODS: We retrospectively analyzed 195 comatose post-CA patients. At least one EEG recording per patient was evaluated to diagnose epileptiform EEG activity. Refractory epileptiform EEG activity was defined as persisting epileptic activity on EEG despite the use of 2 or more anti-epileptics. The time weighted average mean arterial pressure 48hours (TWA-MAP48), the percentage of time with a MAP below 65 and above 85mmHg and the percentage of time with normoxia, hypoxia (<70mmHg), hyperoxia (>150mmHg), normocapnia, hypocapnia (<35mmHg) and hypercapnia (>45mmHg) were calculated...
November 6, 2017: Resuscitation
https://www.readbyqxmd.com/read/29122492/d-leucine-evaluation-in-an-epilepsy-model
#19
Kylie Holden, Adam L Hartman
BACKGROUND: Current medicines do not provide sufficient seizure control for nearly one-third of patients with epilepsy. New options are needed to address this treatment gap. We recently found that the atypical amino acid d-leucine protected against acutely-induced seizures in mice, but its effect in chronic seizures has not been explored. We hypothesized that d-leucine would protect against spontaneous recurrent seizures. We also investigated whether mice lacking a previously-described d-leucine receptor (Tas1R2/R3) would be protected against acutely-induced seizures...
November 7, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29121278/frontal-alpha-delta-eeg-does-not-preclude-volitional-response-during-anaesthesia-prospective-cohort-study-of-the-isolated-forearm-technique
#20
A L Gaskell, D F Hight, J Winders, G Tran, A Defresne, V Bonhomme, A Raz, J W Sleigh, R D Sanders
Background: The isolated forearm test (IFT) is the gold standard test of connected consciousness (awareness of the environment) during anaesthesia. The frontal alpha-delta EEG pattern (seen in slow wave sleep) is widely held to indicate anaesthetic-induced unconsciousness. A priori we proposed that one responder with the frontal alpha-delta EEG pattern would falsify this concept. Methods: Frontal EEG was recorded in a subset of patients from three centres participating in an international multicentre study of IFT responsiveness following tracheal intubation...
October 1, 2017: British Journal of Anaesthesia
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