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https://www.readbyqxmd.com/read/28732342/scope-mtl-a-non-invasive-tool-for-identifying-and-lateralizing-mesial-temporal-lobe-seizures-prior-to-scalp-eeg-ictal-onset
#1
Alice D Lam, Douglas Maus, Sahar F Zafar, Andrew J Cole, Sydney S Cash
OBJECTIVE: In mesial temporal lobe (mTL) epilepsy, seizure onset can precede the appearance of a scalp EEG ictal pattern by many seconds. The ability to identify this early, occult mTL seizure activity could improve lateralization and localization of mTL seizures on scalp EEG. METHODS: Using scalp EEG spectral features and machine learning approaches on a dataset of combined scalp EEG and foramen ovale electrode recordings in patients with mTL epilepsy, we developed an algorithm, SCOPE-mTL, to detect and lateralize early, occult mTL seizure activity, prior to the appearance of a scalp EEG ictal pattern...
July 1, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28732281/epileptic-seizure-detection-in-eegs-signals-based-on-the-weighted-visibility-graph-entropy
#2
Zeynab Mohammadpoory, Mahda Nasrolahzadeh, Javad Haddadnia
PURPOSE: Epileptic seizure detection has been a complex task for both researchers and specialist in that the assessment of epilepsy is difficult because, electroencephalogram (EEG) signals are chaotic and non-stationary. METHOD: This paper proposes a new method based on weighted visibility graph entropy (WVGE) to identify seizure from EEG signals. Single channel EEG signals are mapped onto the WVGs and WVGEs are calculated from these WVGs. Then some features are extracted of WVGEs and given to classifiers to investigate the performance of these features to classify the brain signals into three groups of normal (healthy), seizure free (interictal) and during a seizure (ictal) groups...
July 11, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/28732280/evaluation-of-a-novel-median-power-spectrogram-for-seizure-detection-by-non-neurophysiologists
#3
Peter Yan, Tamar Melman, Sherry Yan, Munkhzul Otgonsuren, Zachary Grinspan
PURPOSE: (1) To evaluate how well resident physicians use a novel EEG spectral analysis tool (the median power spectrogram; MPS) to detect seizures. (2) To assess the capability of the MPS to identify different seizure types. METHODS: 120 EEG records from children with intractable seizures were converted to MPS by taking the median power across leads and using multi-taper spectral estimation. Twelve blinded neurology residents were trained to interpret the spectrogram with a five-minute video tutorial and post-test...
June 15, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/28732257/epileptiform-discharges-in-eeg-and-seizure-risk-in-adolescent-children-of-women-with-epilepsy
#4
Joseph Samuel, Manna Jose, V S Nandini, Sanjeev V Thomas
We aimed to study the epileptiform discharges (ED) and seizure risk in EEG of 12-18-year-old children of women with epilepsy (WWE). Children of WWE who were prospectively followed up in the Kerala registry of epilepsy and pregnancy (KREP), aged 12-16years (n=92; males 48, females 44) underwent clinical evaluation and a 30-min digital 18-channel EEG. The EEG showed epileptiform discharges in 13 children (5 males and 8 females). The EDs were generalized in 9 and focal in 4 (occipital 2, frontal 1, and centroparietal 1)...
July 17, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28730995/decoding-human-mental-states-by-whole-head-eeg-fnirs-during-category-fluency-task-performance
#5
Ahmet Omurtag, Haleh Aghajani, Hasan Onur Keles
Concurrent scalp electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS), which we refer to as EEG+fNIRS, promises greater accuracy than the individual modalities while remaining nearly as convenient as EEG. We sought to quantify the hybrid system's ability to decode mental states and compare it with its unimodal components. Approach. We recorded from healthy volunteers taking the category fluency test and applied machine learning techniques to the data. Main results...
July 21, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28730179/causal-neuro-immune-relationships-at-patients-with-chronic-pyelonephritis-and-cholecystitis-correlations-between-parameters-eeg-hrv-and-white-blood-cell-count
#6
Andriy B Kul'chyns'kyi, Valeriy M Kyjenko, Walery Zukow, Igor L Popovych
We aim to analyze in bounds KJ Tracey's immunological homunculus conception the relationships between parameters of electroencephalogram (EEG) and heart rate variability (HRV), on the one hand, and the parameters of bhite blood cell count, on the other hand. METHODS: In basal conditions in 23 men, patients with chronic pyelonephritis and cholecystitis in remission, recorded EEG ("NeuroCom Standard", KhAI Medica, Ukraine) and HRV ("Cardiolab+VSR", KhAI Medica, Ukraine). In portion of blood counted up white blood cell count...
2017: Open Medicine (Warsaw, Poland)
https://www.readbyqxmd.com/read/28729935/single-trial-eeg-informed-fmri-analysis-of-emotional-decision-problems-in-hot-executive-function
#7
Qian Guo, Tiantong Zhou, Wenjie Li, Li Dong, Suhong Wang, Ling Zou
BACKGROUND: Executive function refers to conscious control in psychological process which relates to thinking and action. Emotional decision is a part of hot executive function and contains emotion and logic elements. As a kind of important social adaptation ability, more and more attention has been paid in recent years. OBJECTIVE: Gambling task can be well performed in the study of emotional decision. As fMRI researches focused on gambling task show not completely consistent brain activation regions, this study adopted EEG-fMRI fusion technology to reveal brain neural activity related with feedback stimuli...
July 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28729926/coherence-of-bold-signal-and-electrical-activity-in-the-human-brain-during-deep-sevoflurane-anesthesia
#8
Daniel Golkowski, Andreas Ranft, Tobias Kiel, Valentin Riedl, Philipp Kohl, Guido Rohrer, Joachim Pientka, Sebastian Berger, Christine Preibisch, Claus Zimmer, George A Mashour, Gerhard Schneider, Eberhard F Kochs, Rüdiger Ilg, Denis Jordan
INTRODUCTION: Changes in neural activity induce changes in functional magnetic resonance (fMRI) blood oxygenation level dependent (BOLD) signal. Commonly, increases in BOLD signal are ascribed to cellular excitation. OBJECTIVE: The relationship between electrical activity and BOLD signal in the human brain was probed on the basis of burst suppression EEG. This condition includes two distinct states of high and low electrical activity. METHODS: Resting-state simultaneous EEG and BOLD measurements were acquired during deep sevoflurane anesthesia with burst suppression EEG in nineteen healthy volunteers...
July 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28729833/altered-neuronal-activity-topography-markers-in-the-elderly-with-increased-atherosclerosis
#9
Takashi Shibata, Toshimitu Musha, Yukio Kosugi, Michiya Kubo, Yukio Horie, Naoya Kuwayama, Satoshi Kuroda, Karin Hayashi, Yohei Kobayashi, Mieko Tanaka, Haruyasu Matsuzaki, Kiyotaka Nemoto, Takashi Asada
Background: Previously, we reported on vascular cognitive impairment (VCI) templates, consisting of patients with VCI associated with carotid stenosis (>60%) using a quantitative electroencephalographic (EEG) technique called neuronal activity topography (NAT). Here using the VCI templates, we investigated the hypothesis that internal carotid artery-intima-media thickness (ICA-IMT) is associated with EEG spectrum intensity (sNAT) and spectrum steepness (vNAT). Methods: A total of 221 community-dwelling elderly subjects were recruited...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28729830/resting-state-fluctuations-of-eeg-sensorimotor-rhythm-reflect-bold-activities-in-the-pericentral-areas-a-simultaneous-eeg-fmri-study
#10
Shohei Tsuchimoto, Shuka Shibusawa, Nobuaki Mizuguchi, Kenji Kato, Hiroki Ebata, Meigen Liu, Takashi Hanakawa, Junichi Ushiba
Blockade of the scalp electroencephalographic (EEG) sensorimotor rhythm (SMR) is a well-known phenomenon following attempted or executed motor functions. Such a frequency-specific power attenuation of the SMR occurs in the alpha and beta frequency bands and is spatially registered at primary somatosensory and motor cortices. Here, we hypothesized that resting-state fluctuations of the SMR in the alpha and beta frequency bands also covary with resting-state sensorimotor cortical activity, without involving task-related neural dynamics...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28729822/low-intensity-focused-tdcs-over-the-motor-cortex-shows-inefficacy-to-improve-motor-imagery-performance
#11
Irma N Angulo-Sherman, Marisol Rodríguez-Ugarte, Eduardo Iáñez, Jose M Azorín
Transcranial direct current stimulation (tDCS) is a brain stimulation technique that can enhance motor activity by stimulating the motor path. Thus, tDCS has the potential of improving the performance of brain-computer interfaces during motor neurorehabilitation. tDCS effects depend on several aspects, including the current density, which usually varies between 0.02 and 0.08 mA/cm(2), and the location of the stimulation electrodes. Hence, testing tDCS montages at several current levels would allow the selection of current parameters for improving stimulation outcomes and the comparison of montages...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28729820/auditory-mismatch-negativity-in-response-to-changes-of-counter-balanced-interaural-time-and-level-differences
#12
Christian F Altmann, Ryuhei Ueda, Shigeto Furukawa, Makio Kashino, Tatsuya Mima, Hidenao Fukuyama
Interaural time differences (ITD) and interaural level differences (ILD) both signal horizontal sound source location. To achieve a unified percept of our acoustic environment, these two cues require integration. In the present study, we tested this integration of ITD and ILD with electroencephalography (EEG) by measuring the mismatch negativity (MMN). The MMN can arise in response to spatial changes and is at least partly generated in auditory cortex. In our study, we aimed at testing for an MMN in response to stimuli with counter-balanced ITD/ILD cues...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28729443/theta-and-beta-band-neural-activity-reflect-independent-syllable-tracking-and-comprehension-of-time-compressed-speech
#13
Maria Pefkou, Luc H Arnal, Lorenzo Fontolan, Anne-Lise Giraud
Recent psychophysics data suggest that speech perception is not limited by the capacity of the auditory system to encode fast acoustic variations through neural gamma activity, but rather by the time given to the brain to decode them. Whether the decoding process is bounded by the capacity of theta rhythm to follow speech syllabic rhythm, or constrained by a more endogenous top-down mechanism, e.g. involving beta activity, is unknown. We addressed the dynamics of auditory decoding in speech comprehension by challenging syllable tracking and speech decoding using comprehensible and incomprehensible time-compressed auditory sentences...
July 20, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28729115/arousal-and-drug-abuse
#14
REVIEW
Francisco J Urbano, Verónica Bisagno, Edgar Garcia-Rill
The reticular activating system (RAS) is not an amorphous region but distinct nuclei with specific membrane properties that dictate their firing during waking and sleep. The locus coeruleus and raphe nucleus fire during waking and slow wave sleep, with the pedunculopontine nucleus (PPN) firing during both waking and REM sleep, the states manifesting arousal-related EEG activity. Two important discoveries in the PPN in the last 10 years are, 1) that some PPN cells are electrically coupled, and 2) every PPN cell manifests high threshold calcium channels that allow them to oscillate at beta/gamma band frequencies...
July 17, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28729063/eeg-source-reconstruction-evidence-for-the-noun-verb-neural-dissociation-along-semantic-dimensions
#15
Bin Zhao, Jianwu Dang, Gaoyan Zhang
One of the long-standing issues in neurolinguistic research is about the neural basis of word representation, concerning whether grammatical classification or semantic difference causes neural dissociation of the brain activity patterns when processing different word categories, especially nouns and verbs. To disentangle the puzzle, four orthogonalized word categories in Chinese: unambiguous nouns (UN), unambiguous verbs (UV), ambiguous words with noun-biased semantics (AN), and ambiguous words with verb-biased semantics (AV) were applied in auditory tasks for recording electroencephalographic (EEG) signals from 128 electrodes on the scalps of twenty-two subjects...
July 17, 2017: Neuroscience
https://www.readbyqxmd.com/read/28728838/kcnq2-encephalopathy-a-case-due-to-a-de-novo-deletion
#16
Carlotta Spagnoli, Grazia Gabriella Salerno, Alessandro Iodice, Daniele Frattini, Francesco Pisani, Carlo Fusco
KCNQ2 encephalopathy is characterized by severely abnormal EEG, neonatal-onset epilepsy and developmental delay. It is caused by mutations (typically missense) in the KCNQ2 gene, encoding the voltage gated potassium channel Kv7.2 and leading to a negative-dominant effect. We present one case experiencing recurrent neonatal seizures with changing hemispheres of origin, reminiscent of epilepsy of infancy with migrating focal seizures. At 9months of age the patient is still seizure-free on carbamazepine, although he is developing a spastic-dystonic tetraplegia with severe dysphagia...
July 17, 2017: Brain & Development
https://www.readbyqxmd.com/read/28728060/clinical-neurophysiology-of-prolonged-disorders-of-consciousness-from-diagnostic-stimulation-to-therapeutic-neuromodulation
#17
REVIEW
Aldo Ragazzoni, Massimo Cincotta, Fabio Giovannelli, Damian Cruse, G Bryan Young, Carlo Miniussi, Simone Rossi
The identification of signs of awareness in patients with prolonged disorders of consciousness (DoC) after severe brain injury is a challenging task for clinicians. Differentiating on behavioural examination the vegetative state (VS) from the minimally conscious state (MCS) can lead to a high misdiagnosis rate. Advanced neuroimaging and neurophysiological techniques can supplement clinical evaluation by providing physiological evidence of brain activity. However, an open issue remains whether these empirical results are directly or indirectly associated with covert consciousness and limitations emerge for their diagnostic application at the single-patient level...
June 29, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28728018/unbelievable-neural-correlate-of-the-feedback-negativity-in-the-anterior-cingulate
#18
Bruno B Averbeck
The feedback- or error-related negativity (FN) has been extensively documented in frontal EEG recordings in human participants. In this issue of Neuron, Hyman et al. (2017) have documented a single-cell correlate of the FN in the ACC of rodents.
July 19, 2017: Neuron
https://www.readbyqxmd.com/read/28727750/functional-connectivity-analysis-in-eeg-source-space-the-choice-of-method
#19
Elham Barzegaran, Maria G Knyazeva
Functional connectivity (FC) is among the most informative features derived from EEG. However, the most straightforward sensor-space analysis of FC is unreliable owing to volume conductance effects. An alternative-source-space analysis of FC-is optimal for high- and mid-density EEG (hdEEG, mdEEG); however, it is questionable for widely used low-density EEG (ldEEG) because of inadequate surface sampling. Here, using simulations, we investigate the performance of the two source FC methods, the inverse-based source FC (ISFC) and the cortical partial coherence (CPC)...
2017: PloS One
https://www.readbyqxmd.com/read/28727639/effects-of-12-week-resistance-exercise-on-electroencephalogram-patterns-and-cognitive-function-in-the-elderly-with-mild-cognitive-impairment-a-randomized-controlled-trial
#20
Soon-Gook Hong, June-Hong Kim, Tae-Won Jun
OBJECTIVE: To investigate the effects of a 12-week resistance exercise program with an elastic band on electroencephalogram (EEG) patterns and cognitive function in elderly patients with mild cognitive impairment (MCI). DESIGN: Randomized controlled trial. SETTING: Community center. PARTICIPANTS: Twenty-two subjects with MCI and 25 healthy volunteer subjects were randomly assigned to 1 of 4 groups: subjects with MCI who undertook the exercise program (MCI-EX; n = 10), an MCI control group (MCI-Con; n = 12), a healthy volunteer exercise group (NG-EX; n = 12), and a healthy volunteer control group (NG-Con; n = 13)...
July 14, 2017: Clinical Journal of Sport Medicine: Official Journal of the Canadian Academy of Sport Medicine
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