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Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)

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https://www.readbyqxmd.com/read/28056537/local-and-widely-distributed-eeg-activity-in-schizophrenia-with-prevalence-of-negative-symptoms
#1
Vera A Grin-Yatsenko, Valery A Ponomarev, Marina V Pronina, Yury I Poliakov, Irina V Plotnikova, Juri D Kropotov
We evaluated EEG frequency abnormalities in resting state (eyes closed and eyes open) EEG in a group of chronic schizophrenia patients as compared with healthy subjects. The study included 3 methods of analysis of deviation of EEG characteristics: genuine EEG, current source density (CSD), and group independent component (gIC). All 3 methods have shown that the EEG in schizophrenia patients is characterized by enhanced low-frequency (delta and theta) and high-frequency (beta) activity in comparison with the control group...
January 1, 2017: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27837050/application-and-evaluation-of-independent-component-analysis-methods-to-generalized-seizure-disorder-activities-exhibited-in-the-brain
#2
S Thomas George, R Balakrishnan, J Stanly Johnson, J Jayakumar
EEG records the spontaneous electrical activity of the brain using multiple electrodes placed on the scalp, and it provides a wealth of information related to the functions of brain. Nevertheless, the signals from the electrodes cannot be directly applied to a diagnostic tool like brain mapping as they undergo a "mixing" process because of the volume conduction effect in the scalp. A pervasive problem in neuroscience is determining which regions of the brain are active, given voltage measurements at the scalp...
November 11, 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27821482/toward-an-attention-based-diagnostic-tool-for-patients-with-locked-in-syndrome
#3
Damien Lesenfants, Dina Habbal, Camille Chatelle, Andrea Soddu, Steven Laureys, Quentin Noirhomme
Electroencephalography (EEG) has been proposed as a supplemental tool for reducing clinical misdiagnosis in severely brain-injured populations helping to distinguish conscious from unconscious patients. We studied the use of spectral entropy as a measure of focal attention in order to develop a motor-independent, portable, and objective diagnostic tool for patients with locked-in syndrome (LIS), answering the issues of accuracy and training requirement. Data from 20 healthy volunteers, 6 LIS patients, and 10 patients with a vegetative state/unresponsive wakefulness syndrome (VS/UWS) were included...
November 7, 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27821481/serial-eeg-monitoring-in-a-patient-with-anti-nmda-receptor-encephalitis
#4
Yanfang Shi
Electroencephalogram (EEG) abnormalities are very common in anti-N-methyl-d-aspartate receptor (anti-NMDAR) encephalitis. Extreme delta brush (EDB) is a distinctive EEG pattern that is can be suggestive of the diagnosis; however, the etiology of the EDB remains unclear. Furthermore, there is question with regard to its ictal or interictal nature. We report a 20-year-old woman with anti-NMDAR encephalitis whose serial video-EEG monitoring was obtained at 2, 2.5, 4, and 6 months after admission. There was a long-standing EDB lasting up to several hours, with no evolution in frequency, amplitude, or morphology, and without clear association her frequent orofacial dyskinesia...
November 7, 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27807013/beta-responses-in-healthy-elderly-and-in-patients-with-amnestic-mild-cognitive-impairment-during-a-task-of-temporal-orientation-of-attention
#5
Giuseppe Caravaglios, Giuseppe Castro, Emma Gabriella Muscoso, Davide Crivelli, Michela Balconi
Recent studies demonstrated that beta oscillations are elicited during cognitive processes. To investigate their potential as electrophysiological markers of amnestic mild cognitive impairment (aMCI), we recorded beta EEG activity during resting and during an omitted tone task in patients and healthy elderly. Thirty participants were enrolled (15 patients, 15 healthy controls). In particular, we investigated event-related spectral perturbation and intertrial coherence indices. Analyses showed that (a) healthy elderly presented greater beta power at rest than patients with aMCI patients; (b) during the task, healthy elderly were more accurate than aMCI patients and presented greater beta power than aMCI patients; (c) both groups showed qualitatively similar spectral perturbation responses during the task, but different spatiotemporal response patterns; and (d) aMCI patients presented greater beta phase locking than healthy elderly during the task...
November 2, 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27576329/unilateral-sreda-in-a-patient-with-stroke
#6
Zeke M Campbell, Peter W Kaplan, Jonathan C Edwards
Subclinical rhythmic electrographic discharges in adults (SREDA) is a well-known benign EEG phenomenon. However, the occurrence of SREDA is rare, and atypical forms are even more elusive, with only few cases reported in the literature. Herein, we describe a case of a 77-year-old woman with a left middle cerebral artery stroke and paroxysms of rhythmic, sharply contoured activity over the right central head region, mimicking focal seizures on EEG, that were determined to represent atypical SREDA. To our knowledge, no case of SREDA with a contralateral structural cerebral abnormality has been described, and its occurrence offers some limited insight as to the mechanisms underlying this mysterious entity...
January 2017: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27170672/quantitative-eeg-in-children-and-adults-with-attention-deficit-hyperactivity-disorder-comparison-of-absolute-and-relative-power-spectra-and-theta-beta-ratio
#7
Silvana Markovska-Simoska, Nada Pop-Jordanova
In recent decades, resting state electroencephalographic (EEG) measures have been widely used to document underlying neurophysiological dysfunction in attention deficit hyperactivity disorder (ADHD). Although most EEG studies focus on children, there is a growing interest in adults with ADHD too. The aim of this study was to objectively assess and compare the absolute and relative EEG power as well as the theta/beta ratio in children and adults with ADHD. The evaluated sample comprised 30 male children and 30 male adults with ADHD diagnosed according to DSM-IV criteria...
January 2017: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27170669/mismatch-negativity-in-first-episode-schizophrenia-a-meta-analysis
#8
Sarah M Haigh, Brian A Coffman, Dean F Salisbury
Mismatch negativity (MMN) to deviant stimuli is robustly smaller in individuals with chronic schizophrenia compared with healthy controls (Cohen's d > 1.0 or more), leading to the possibility of MMN being used as a biomarker for schizophrenia. However, there is some debate in the literature as to whether MMN is reliably reduced in first-episode schizophrenia patients. For the biomarker to be used as a predictive marker for schizophrenia, it should be reduced in the majority of cases known to have the disease, particularly at disease onset...
January 2017: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27107024/eeg-in-sarcoidosis-patients-without-neurological-findings
#9
Özgür Bilgin Topçuoğlu, Murat Kavas, Selahattin Öztaş, Sibel Arınç, Gülgün Afşar, Sema Saraç, İpek Midi
Sarcoidosis is a multisystem granulomatous disease affecting nervous system in 5% to 10% of patients. Magnetic resonance imaging (MRI) is accepted as the most sensitive method for detecting neurosarcoidosis. However, the most common findings in MRI are the nonspecific white matter lesions, which may be unrelated to sarcoidosis and can occur because of hypertension, diabetes mellitus, smoking, and other inflammatory or infectious disorders, as well. Autopsy studies report more frequent neurological involvement than the ante mortem studies...
January 2017: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27094758/wake-and-sleep-eeg-in-patients-with-huntington-disease-an-eloreta-study-and-review-of-the-literature
#10
Carla Piano, Edoardo Mazzucchi, Anna Rita Bentivoglio, Anna Losurdo, Giovanna Calandra Buonaura, Claudio Imperatori, Pietro Cortelli, Giacomo Della Marca
The aim of the study was to evaluate the EEG modifications in patients with Huntington disease (HD) compared with controls, by means of the exact LOw REsolution Tomography (eLORETA) software. We evaluated EEG changes during wake, non-rapid eye movement (NREM) and rapid eye movement (REM) sleep. Moreover, we reviewed the literature concerning EEG modifications in HD. Twenty-three consecutive adult patients affected by HD were enrolled, 14 women and 9 men, mean age was 57.0 ± 12.4 years. Control subjects were healthy volunteers (mean age 58...
January 2017: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27068513/eeg-findings-may-serve-as-a-potential-biomarker-for-anti-nmda-receptor-encephalitis
#11
Erin Pennock Foff, David Taplinger, Joanna Suski, M Beatriz S Lopes, Mark Quigg
Objective To determine if an electroencephalographic (EEG) characteristic, beta:delta power ratio (BDPR), is significantly higher for N-methyl-d-aspartate receptor encephalitis (NMDARE) patients than for non-NMDARE patients on presenting EEG. Identification of an additional EEG biomarker with significant specificity for NMDARE (in the absence of frank delta brush) could potentially allow for early identification of at-risk patients. Methods Single center retrospective comparison of NMDARE and non-NMDARE consecutive cases of encephalitis, collated over a 6-year period (from 2008 to 2014)...
January 2017: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/26873935/alteration-of-duration-mismatch-negativity-induced-by-transcranial-magnetic-stimulation-over-the-left-parietal-lobe
#12
Hirokazu Oshima, Tetsuya Shiga, Shin-Ichi Niwa, Hiroyuki Enomoto, Yoshikazu Ugawa, Hirooki Yabe
Mismatch negativity (MMN) is generated by a comparison between an incoming sound and the memory trace of preceding sounds stored in sensory memory without any attention to the sound. N100 (N1) is associated with the afferent response to sound onset and reflects early analysis of stimulus characteristics. MMN generators are present in the temporal and frontal lobe, and N1 generators are present in the temporal lobe. The parietal lobe is involved in MMN generation elicited by a change in duration. The anatomical network connecting these areas, lateralization, and the effect of the side of ear stimulation on MMN remain unknown...
January 2017: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/26755506/efficacy-of-the-sequential-administration-of-melatonin-hydroxyzine-and-chloral-hydrate-for-recording-sleep-eegs-in-children
#13
Maya Dirani, Wassim Nasreddine, Jawad Melhem, Maher Arabi, Ahmad Beydoun
Sedation of children for electroencephalography (EEG) recordings is often required. Chloral hydrate (CH) requires medical clearance and continuous monitoring. To try to reduce personnel and time resources associated with CH administration, a new sedation policy was formulated. This study included all children who underwent an EEG during a consecutive 3-month period following the implementation of the new sedation policy, which consists of the sequential administration of melatonin, hydroxyzine (if needed), and CH (if needed)...
January 2017: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/26674366/eeg-abnormalities-are-associated-with-poorer-depressive-symptom-outcomes-with-escitalopram-and-venlafaxine-xr-but-not-sertraline-results-from-the-multicenter-randomized-ispot-d-study
#14
Martijn Arns, Evian Gordon, Nash N Boutros
Rationale Limited research is available on electrophysiological abnormalities such as epileptiform EEG or EEG slowing in depression and its association with antidepressant treatment response. Objectives We investigated the association between EEG abnormalities and antidepressant treatment response in the international Study to Predict Optimized Treatment in Depression (iSPOT-D). Methods Of 1008 participants with major depressive disorder randomized to escitalopram, sertraline, or venlafaxine-XR, 622 completed 8 weeks of treatment per protocol...
January 2017: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27798290/medication-effects-on-eeg-biomarkers-in-attention-deficit-hyperactivity-disorder
#15
Havva Nuket Isiten, Merve Cebi, Bernis Sutcubasi Kaya, Baris Metin, Nevzat Tarhan
EEG biomarkers have become increasingly used to aid in diagnosis of attention-deficit/hyperactivity disorder (ADHD). Despite several studies suggesting that EEG theta/beta ratio may help discriminating ADHD from other disorders, the effect of medications on theta/beta ratio is not known. Forty-three children with ADHD that were evaluated with quantitative EEG before and after methylphenidate were included in the study. Theta/beta ratio, theta and beta powers for whole brain, central, and frontal areas were calculated...
October 25, 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27733638/generalizability-of-frequency-weighting-curve-for-extraction-of-spectral-drowsy-component-from-the-eeg-signals-recorded-in-eyes-closed-condition
#16
Arcady A Putilov, Olga G Donskaya, Evgeniy G Verevkin
One of the critical barriers to reducing the threats of sleep loss to public health, safety, and productivity is a lack of practical tools for quick identification of objective level of sleepiness. We examined a novel sleepiness measure named "spectral drowsy component score" to provide evidence for generalizability of a frequency weighting curve required for calculation of this measure. Each spectral drowsy component score is a sum of 16 weighted ln-transformed single-Hz power densities (1-16 Hz) obtained by the fast Fourier transformation of an electroencephalographic signal recorded during the first minute after closing the eyes...
October 11, 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/28071147/abstracts-of-presentations-at-the-joint-meeting-of-the-eeg-clinical-neuroscience-society-ecns-the-international-society-for-brain-electromagnetic-topography-isbet-and-the-international-society-for-neuroimaging-in-psychiatry-isnip-in-halifax-nova-scotia-canada
#17
(no author information available yet)
No abstract text is available yet for this article.
October 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27807145/frederic-andrews-gibbs-m-d-eeg-pioneer
#18
Catherine Rich Demeter
No abstract text is available yet for this article.
October 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27118763/post-encephalitic-parkinsonism-and-sleep-disorder-responsive-to-immunological-treatment-a-case-report
#19
Valerio Brunetti, Elisa Testani, Raffaele Iorio, Giovanni Frisullo, Marco Luigetti, Daniela Di Giuda, Giacomo Della Marca
We describe a 70-year-old man who, after a viral encephalitis associated with pneumonia, progressively developed a parkinsonism associated with lethargy. Encephalitis manifested with persistent hiccups, seizures and impairment of consciousness. After 2 weeks, the initial neurologic symptoms subsided and the patient progressively developed movement disorders (rigidity and bradykinesia, resistant to L-DOPA), lethargy and behavioral hypersomnia. Magnetic resonance imaging showed thalamic and hippocampal signal abnormalities, immunohistochemistry on a mouse brain substrate revealed serum autoantibodies binding to the brainstem neuropil...
October 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/26920849/low-complexity-discriminative-feature-selection-from-eeg-before-and-after-short-term-memory-task
#20
Neda Behzadfar, S Mohammad P Firoozabadi, Kambiz Badie
A reliable and unobtrusive quantification of changes in cortical activity during short-term memory task can be used to evaluate the efficacy of interfaces and to provide real-time user-state information. In this article, we investigate changes in electroencephalogram signals in short-term memory with respect to the baseline activity. The electroencephalogram signals have been analyzed using 9 linear and nonlinear/dynamic measures. We applied statistical Wilcoxon examination and Davis-Bouldian criterion to select optimal discriminative features...
October 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
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