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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/27837050/application-and-evaluation-of-independent-component-analysis-methods-to-generalized-seizure-disorder-activities-exhibited-in-the-brain
#1
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
#2
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
#3
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
#4
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/27798290/medication-effects-on-eeg-biomarkers-in-attention-deficit-hyperactivity-disorder
#5
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
#6
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/27807145/frederic-andrews-gibbs-m-d-eeg-pioneer
#7
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/27582502/decrease-of-delta-oscillatory-responses-in-cognitively-normal-parkinson-s-disease
#8
Derya Durusu Emek-Savaş, Gülin Özmüş, Bahar Güntekin, Berril Dönmez Çolakoğlu, Raif Çakmur, Erol Başar, Görsev G Yener
Parkinson's disease (PD) is a common progressive neurodegenerative disorder. This study aims to compare sensory-evoked oscillations (SEOs) and event-related oscillations (EROs) of visual modality in cognitively normal PD patients and healthy controls. Sixteen PD and 16 age-, gender-, and education-matched healthy controls participated in the study. A simple flashlight was used for SEO and a classical visual oddball paradigm was used for target ERO. Oscillatory responses in the delta frequency range (0.5-3.5 Hz) were examined...
August 31, 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27582501/prognostic-utility-of-clinical-epilepsy-severity-score-versus-pretreatment-hypsarrhythmia-scoring-in-children-with-west-syndrome
#9
Rachna Sehgal, Sheffali Gulati, Savita Sapra, Manjari Tripathi, Ravinder Mohan Pandey, Madhulika Kabra
This cross-sectional study assessed the impact of clinical epilepsy severity and pretreatment hypsarrhythmia severity on epilepsy and cognitive outcomes in treated children with West syndrome. Thirty-three children, aged 1 to 5 years, with infantile spasms were enrolled if pretreatment EEG records were available, after completion of ≥1 year of onset of spasms. Neurodevelopment was assessed by Development Profile 3 and Gross Motor Function Classification System. Epilepsy severity in the past 1 year was determined by the Early Childhood Epilepsy Severity Score (E-Chess)...
August 31, 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
#10
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...
August 30, 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27552823/an-investigation-of-stimulant-effects-on-the-eeg-of-children-with-attention-deficit-hyperactivity-disorder
#11
Adam R Clarke, Robert J Barry, Iris E Baker, Rory McCarthy, Mark Selikowitz
Stimulant medications are the most commonly prescribed treatment for Attention-Deficit/Hyperactivity Disorder (AD/HD). These medications result in a normalization of the EEG. However, past research has found that complete normalization of the EEG is not always achieved. One reason for this may be that studies have used different medications interchangeably, or groups of subjects on different stimulants. This study investigated whether methylphenidate and dexamphetamine produce different levels of normalization of the EEG in children with AD/HD...
August 23, 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27515699/abnormal-somatosensory-synchronization-in-patients-with-paroxysmal-kinesigenic-dyskinesia-a-magnetoencephalographic-study
#12
Fu-Jung Hsiao, Wan-Yu Hsu, Wei-Ta Chen, Rou-Shayn Chen, Yung-Yang Lin
Paroxysmal kinesigenic dyskinesia (PKD) is a rare group of hyperkinetic movement disorders characterized by brief attacks of choreoathetosis or dystonia. To clarify the alterations of the functional connectivity within the somatosensory network in PKD patients, magnetoencephalographic (MEG) responses to paired median-nerve electrical stimulation were recorded in 10 PKD patients treated by carbamazepine or oxcarbamazepine and 22 age-matched controls. In patients, MEG recordings were obtained during drug-on and -off periods...
August 11, 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27515698/cerebrospinal-fluid-biomarkers-of-alzheimer-s-disease-correlate-with-electroencephalography-parameters-assessed-by-exact-low-resolution-electromagnetic-tomography-eloreta
#13
Masahiro Hata, Toshihisa Tanaka, Hiroaki Kazui, Ryouhei Ishii, Leonides Canuet, Roberto D Pascual-Marqui, Yasunori Aoki, Shunichiro Ikeda, Shunsuke Sato, Yukiko Suzuki, Hideki Kanemoto, Kenji Yoshiyama, Masao Iwase
Recently, cerebrospinal fluid (CSF) biomarkers related to Alzheimer's disease (AD) have garnered a lot of clinical attention. To explore neurophysiological traits of AD and parameters for its clinical diagnosis, we examined the association between CSF biomarkers and electroencephalography (EEG) parameters in 14 probable AD patients. Using exact low-resolution electromagnetic tomography (eLORETA), artifact-free 40-sesond EEG data were estimated with current source density (CSD) and lagged phase synchronization (LPS) as the EEG parameters...
August 11, 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27491643/contribution-of-quantitative-eeg-to-the-diagnosis-of-early-cognitive-impairment-in-patients-with-idiopathic-parkinson-s-disease
#14
Derya Guner, Bedile Irem Tiftikcioglu, Nilgun Tuncay, Yasar Zorlu
Cognitive dysfunction can emerge during the clinical course of Parkinson's disease (PD) even beginning in early stages, which requires extended neuropsychological tests for diagnosis. There is need for rapid, feasible, and practical tests in clinical practice to diagnose and monitor the patients without causing any discomfort. We investigated the utility of quantitative analysis of digital EEG (qEEG) for diagnosing subtle cognitive impairment in PD patients without evident cognitive deficits (ie, "normal cognition")...
August 3, 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/27468748/electrophysiological-study-on-cognitive-function-in-systemic-lupus-erythematosus-patients-with-previous-neuropsychiatric-involvement
#15
Yang Gao, Raymond Tak Fai Cheung, Junling Gao, Esther Y Y Lau, Jacky Ho Yin Wan, Mo Yin Mok
This study aimed to evaluate P300 as an electrophysiological marker of cognitive function in patients with systemic lupus erythematosus (SLE) who had previous neuropsychiatric (NPSLE) involvement and were diagnosed to have cognitive impairment by standard neuropsychological tests. Event-related potentials (ERPs) were assessed by the auditory and visual oddball paradigms. Amplitude and latency of P300 at the frontal (Fz), central (Cz), and parietal (Pz) regions were determined and compared with controls. P300 detection was performed in NPSLE patients with pre-diagnosed cognitive impairment (n = 9), matched SLE patients without previous NPSLE (non-NPSLE) (n = 9), and healthy controls (n = 15)...
July 27, 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/26415612/the-effectiveness-of-visual-short-time-neurofeedback-on-brain-activity-and-clinical-characteristics-in-alcohol-use-disorders-practical-issues-and-results
#16
Nina Lackner, Human F Unterrainer, Dimitris Skliris, Guilherme Wood, Sandra J Wallner-Liebmann, Christa Neuper, John H Gruzelier
The present study was carried out to examine the efficacy of alpha/theta neurofeedback (NF) with a new visual paradigm in a cohort of alcohol use disordered (AUD) patients (n = 25) treated in an Austrian therapeutic community center. The experimental study design focused on changes in absolute and relative resting EEG band power as well as in clinical variables, including depression (Beck Depresion Inventory [BDI-V]), psychiatric symptoms (Brief Symptom Inventory [BSI], coping (Freiburg Questionnaire on Coping with Illness [FKV-lis]), psychotherapy motivation (Therapy Motivation Questionnaire [FPTM-23]), sense of coherence (Sense of Coherence Scale [SOC-13]), posttraumatic growth (Posttraumatic Growth Inventory [PPR]), and alcohol cravings (Alcohol Craving Questionnaire [ACQ])...
July 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/26346965/gamma-band-modulation-and-coherence-in-the-eeg-by-involuntary-eye-movements-in-patients-in-unresponsive-wakefulness-syndrome
#17
Susanne Balazs, Kazem Kermanshahi, Heinrich Binder, Frank Rattay, Ivan Bodis-Wollner
Gamma power and coherence in the electroencephalogram increase in healthy individuals in association with voluntary eye movements, saccades. Patients with unresponsive wakefulness syndrome show repetitive involuntary eye movements that are similar to saccades but progress at a much lower speed. In the present study, we explored the changes in gamma power and coherence related to these eye movements and investigated whether any relationship to the patients' clinical status could be found that would indicate first neurophysiological signs of recovery...
July 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/26240088/are-there-any-specific-eeg-findings-in-autoimmune-epilepsies
#18
Leyla Baysal-Kirac, Erdem Tuzun, Ebru Altindag, Esme Ekizoglu, Demet Kinay, Basar Bilgic, Pinar Tekturk, Betul Baykan
This study evaluated the EEG findings of patients whose seizures were associated with a possible autoimmune etiology. Our aim was to find clues to distinguish patients with antineuronal antibodies (Ab) through EEG studies. We reviewed our database and identified antineuronal Ab positive epilepsy patients with or without autoimmune encephalitis. These patients had Abs to N-methyl-d-aspartate receptor (NMDAR) (n = 5), glycine receptor (GLY-R) (n = 5), contactin-associated protein-like 2 (CASPR-2) (n = 4), uncharacterized voltage-gated potassium channel complex (VGKC) antigens (n = 2), glutamic acid decarboxylase (GAD) (n = 2), Hu (n = 1), and amphiphysin (n = 1)...
July 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/26002855/quantitative-eeg-and-low-resolution-electromagnetic-tomography-loreta-imaging-of-patients-undergoing-methadone-treatment-for-opiate-addiction
#19
Grace Y Wang, Robert R Kydd, Bruce R Russell
Methadone maintenance treatment (MMT) has been used as a treatment for opiate dependence since the mid-1960s. Evidence suggests that methadone binds to mu opiate receptors as do other opiates and induces changes in neurophysiological function. However, little is known, about how neural activity within the higher frequency gamma band (>30 Hz) while at rest changes in those stabilized on MMT despite its association with the excitation-inhibition balance within pyramidal-interneuron networks. Our study investigated differences in resting gamma power (37-41 Hz) between patients undergoing MMT for opiate dependence, illicit opiate users, and healthy controls subjects...
July 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/25994764/reflex-seizures-triggered-by-exposure-to-characters-with-numerical-value-a-case-with-right-temporal-cortical-dysplasia
#20
Şefik Evren Erdener, F Irsel Tezer, Kader K Oğuz, Özden Kamışlı, Eser Lay Ergün, Figen Söylemezoğlu, Serap Saygi
Reflex seizures can be triggered by a variety of stimuli. We present a case with drug-resistant complex partial seizures originating in right temporal lobe triggered extensively by visual, auditory, and mental exposure to multidigit numbers. The patient was investigated in video-EEG monitoring unit and seizures were triggered by numerical stimuli. Scalp EEG findings suggested a right temporal focus but ictal semiological findings suspicious for an extratemporal area necessitated the invasive EEG study. A right anterior temporal seizure focus was established with invasive monitoring and cortical stimulation studies...
July 2016: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
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