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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/29788790/eeg-differences-in-two-clinically-similar-rapid-dementias-voltage-gated-potassium-channel-complex-associated-autoimmune-encephalitis-and-creutzfeldt-jakob-disease
#1
Brin Freund, John C Probasco, Mackenzie C Cervenka, Raoul Sutter, Peter W Kaplan
Distinguishing treatable causes for rapidly progressive dementia from those that are incurable is vital. Creutzfeldt-Jakob disease (CJD) and voltage-gated potassium channel complex-associated autoimmune encephalitis (VGKC AE) are 2 such conditions with disparate outcomes and response to treatment. To determine the differences in electroencephalography between CJD and VGKC AE, we performed a retrospective review of medical records and examined clinical data, neuroimaging, and electroencephalographs performed in patients admitted for evaluation for rapidly progressive dementia diagnosed with CJD and VGKC AE at the Johns Hopkins Hospital and Bayview Medical Center between January 1, 2007 and December 31, 2015...
May 1, 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29788788/diagnostic-performance-of-the-electroencephalogram-in-the-elderly-manifesting-with-episodes-of-unresponsiveness
#2
Chusak Limotai, Patcharapa Tasanaworapunya, Iyavut Thaipisuttikul
This study aimed to determine diagnostic performance of the EEG in diagnosing seizures and to ascertain risk factors associated with seizures in the elderly presenting with episodes of unresponsiveness compared with younger patients. This is a cross-sectional study. Only EEGs requested with indication of transient unresponsiveness (TUR) were included. Patients were divided into 2 groups, younger (aged 18-49 years) and elderly (aged >60 years). The EEG was an index test. Reference standard, independently verified by 2 board-certified neurologists, was a clinical diagnosis of presence or absence of epilepsy/probable seizures...
May 1, 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29788779/elevated-serum-lipid-peroxidation-and-reduced-vitamin-c-and-trace-element-concentrations-are-correlated-with-epilepsy
#3
Abhijit Das, Md Shahid Sarwar, Md Shohel Hossain, Palash Karmakar, Mohammad Safiqul Islam, Mohammad Enayet Hussain, Sujan Banik
BACKGROUND: Epilepsy is one of the chronic and heterogeneous epidemic neurological disorders leading to substantial mortality. The aim of the present study was to investigate the serum levels of malondialdehyde (MDA), vitamin C, and trace elements namely zinc (Zn), copper (Cu), and manganese (Mn) in epileptic patients of Bangladesh and to establish if there are any pathophysiological correlations. METHODS: This was a case-control study with 40 generalized epileptic patients and 40 healthy subjects as controls...
May 1, 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29788768/short-term-impact-of-tdcs-over-the-right-inferior-frontal-cortex-on-impulsive-responses-in-a-go-no-go-task
#4
Salvatore Campanella, Elisa Schroder, Marie-Anne Vanderhasselt, Chris Baeken, Charles Kornreich, Paul Verbanck, Boris Burle
Inhibitory control, a process deeply studied in laboratory settings, refers to the ability to inhibit an action once it has been initiated. A common way to process data in such tasks is to take the mean response time (RT) and error rate per participant. However, such an analysis ignores the strong dependency between spontaneous RT variations and error rate. Conditional accuracy function (CAF) is of particular interest, as by plotting the probability of a response to be correct as a function of its latency, it provides a means for studying the strength of impulsive responses associated with a higher frequency of fast response errors...
May 1, 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29707968/electroencephalography-findings-in-crohn-s-disease
#5
Ulker Anadol Kelleci, Turan Calhan, Abdurrahman Sahin, Zeynep Aydin-Ozemir, Resul Kahraman, Kamil Ozdil, Haci Mehmet Sokmen, Ayse Destina Yalcin
OBJECTIVES: Crohn's Disease (CD) is a chronic systemic inflammatory disease associated with various extraintestinal manifestations, including seizure as a neurological finding. In this study, the prevalence of seizure and electroencephalographic abnormalities in patients with CD was investigated. MATERIALS AND METHODS: This study involved 41 patients with CD (female/male: 25/16) and 39 subjects in the control group (female/male: 25/14). Patients in the CD group were diagnosed and monitored according to the European Crohn's and Colitis Organization diagnostic criteria...
April 1, 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29690785/saliency-of-vowel-features-in-neural-responses-of-cochlear-implant-users
#6
François Prévost, Alexandre Lehmann
Cochlear implants restore hearing in deaf individuals, but speech perception remains challenging. Poor discrimination of spectral components is thought to account for limitations of speech recognition in cochlear implant users. We investigated how combined variations of spectral components along two orthogonal dimensions can maximize neural discrimination between two vowels, as measured by mismatch negativity. Adult cochlear implant users and matched normal-hearing listeners underwent electroencephalographic event-related potentials recordings in an optimum-1 oddball paradigm...
April 1, 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29631447/diagnostic-performance-and-utility-of-quantitative-eeg-analyses-in-delirium-confirmatory-results-from-a-large-retrospective-case-control-study
#7
Robert Fleischmann, Steffi Tränkner, Rouven Bathe-Peters, Maria Rönnefarth, Sein Schmidt, Stephan J Schreiber, Stephan A Brandt
BACKGROUND: The lack of objective disease markers is a major cause of misdiagnosis and nonstandardized approaches in delirium. Recent studies conducted in well-selected patients and confined study environments suggest that quantitative electroencephalography (qEEG) can provide such markers. We hypothesize that qEEG helps remedy diagnostic uncertainty not only in well-defined study cohorts but also in a heterogeneous hospital population. METHODS: In this retrospective case-control study, EEG power spectra of delirious patients and age-/gender-matched controls (n = 31 and n = 345, respectively) were fitted in a linear model to test their performance as binary classifiers...
March 1, 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29611429/evaluating-the-contribution-of-eeg-power-profiles-to-characterize-and-discriminate-posttraumatic-stress-symptom-factors-in-a-combat-exposed-population
#8
Christina M Sheerin, Laura M Franke, Steven H Aggen, Ananda B Amstadter, William C Walker
This study investigated the use of resting-state electroencephalography (EEG) data to help differentiate posttraumatic stress disorder (PTSD) symptom factors. The sample, 147 combat-exposed OIF/OEF (Operation Iraqi Freedom/Operation Enduring Freedom) Veterans and service members, was a polytrauma population with variable PTSD and mild traumatic brain injury (mTBI) diagnoses. Participants completed the PTSD Checklist (PCL) and resting-state EEG was assessed for 10 minutes, with eyes closed. Regional averages of absolute power in alpha, beta, delta, and theta frequency bands were computed to estimate a single EEG common factor per band...
March 1, 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29569473/neurofeedback-based-enhancement-of-single-trial-auditory-evoked-potentials-treatment-of-auditory-verbal-hallucinations-in-schizophrenia
#9
Kathryn Rieger, Marie-Helene Rarra, Laura Diaz Hernandez, Daniela Hubl, Thomas Koenig
Auditory verbal hallucinations depend on a broad neurobiological network ranging from the auditory system to language as well as memory-related processes. As part of this, the auditory N100 event-related potential (ERP) component is attenuated in patients with schizophrenia, with stronger attenuation occurring during auditory verbal hallucinations. Changes in the N100 component assumingly reflect disturbed responsiveness of the auditory system toward external stimuli in schizophrenia. With this premise, we investigated the therapeutic utility of neurofeedback training to modulate the auditory-evoked N100 component in patients with schizophrenia and associated auditory verbal hallucinations...
March 1, 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29502452/auditory-mismatch-negativity-and-p300a-elicited-by-the-optimal-multi-feature-paradigm-in-early-schizophrenia
#10
Derek J Fisher, Debra J Campbell, Shelagh C Abriel, Emma M L Ells, Erica D Rudolph, Philip G Tibbo
The mismatch negativity (MMN) is an EEG-derived event-related potential (ERP) elicited by any violation of a predicted auditory "rule," regardless of whether one is attending to the stimuli and is thought to reflect updating of the stimulus context. Redirection of attention toward a rare, distracting stimulus event, however, can be measured by the subsequent P3a component of the P300. Chronic schizophrenia patients exhibit robust MMN deficits, as well as reductions in P3a amplitude. While, the substantial literature on the MMN in first-episode and early phase schizophrenia in this population reports reduced amplitudes, there also exist several contradictory studies...
March 1, 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29502442/abstracts-of-the-basic-and-clinical-multimodal-imaging-baci-conference-annual-joint-meeting-of-ecns-isbet-isfsi-and-isnip-bern-switzerland-august-29-september-2-2017
#11
(no author information available yet)
No abstract text is available yet for this article.
March 1, 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29502434/using-mismatch-negativity-to-investigate-the-pathophysiology-of-substance-use-disorders-and-comorbid-psychosis
#12
Jessica U Ramlakhan, Reza Zomorrodi, Jonathan Downar, Daniel M Blumberger, Zafiris J Daskalakis, Tony P George, Michael Kiang, Mera S Barr
Substance use disorders (SUDs) have a devastating impact on society and place a heavy burden on health care systems. Given that alcohol, tobacco, and cannabis use have the highest prevalence, further understanding of the underlying pathophysiology of these SUDs is crucial. Electroencephalography is an inexpensive, temporally superior, and translatable technique which enables investigation of the pathobiology of SUDs through the evaluation of various event-related potential components, including mismatch negativity (MMN)...
March 1, 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29284291/the-use-of-quantitative-eeg-for-differentiating-frontotemporal-dementia-from-late-onset-bipolar-disorder
#13
Sinem Zeynep Metin, Turker Tekin Erguzel, Gulhan Ertan, Celal Salcini, Betul Kocarslan, Merve Cebi, Baris Metin, Oguz Tanridag, Nevzat Tarhan
The behavioral variant frontotemporal dementia (bvFTD) usually emerges with behavioral changes similar to changes in late-life bipolar disorder (BD) especially in the early stages. According to the literature, a substantial number of bvFTD cases have been misdiagnosed as BD. Since the literature lacks studies comparing differential diagnosis ability of electrophysiological and neuroimaging findings in BD and bvFTD, we aimed to show their classification power using an artificial neural network and genetic algorithm based approach...
May 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29108430/exploration-of-the-pathophysiology-of-chronic-pain-using-quantitative-eeg-source-localization
#14
Leslie S Prichep, Jaini Shah, Henry Merkin, Emile M Hiesiger
Chronic pain affects more than 35% of the US adult population representing a major public health imperative. Currently, there are no objective means for identifying the presence of pain, nor for quantifying pain severity. Through a better understanding of the pathophysiology of pain, objective indicators of pain might be forthcoming. Brain mechanisms mediating the painful state were imaged in this study, using source localization of the EEG. In a population of 77 chronic pain patients, significant overactivation of the "Pain Matrix" or pain network, was found in brain regions including, the anterior cingulate, anterior and posterior insula, parietal lobule, thalamus, S1, and dorsolateral prefrontal cortex (DLPFC), consistent with those reported with conventional functional imaging, and extended to include the mid and posterior cingulate, suggesting that the increased temporal resolution of electrophysiological measures may allow a more precise identification of the pain network...
March 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29076357/evaluating-brain-computer-interface-performance-in-an-als-population-checkerboard-and-color-paradigms
#15
David B Ryan, Kenneth A Colwell, Chandra S Throckmorton, Leslie M Collins, Kevin Caves, Eric W Sellers
The objective of this study was to investigate the performance of 3 brain-computer interface (BCI) paradigms in an amyotrophic lateral sclerosis (ALS) population (n = 11). Using a repeated-measures design, participants completed 3 BCI conditions: row/column (RCW), checkerboard (CBW), and gray-to-color (CBC). Based on previous studies, it is hypothesized that the CBC and CBW conditions will result in higher accuracy, information transfer rate, waveform amplitude, and user preference over the RCW condition. An offline dynamic stopping simulation will also increase information transfer rate...
March 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29017369/the-success-rate-of-neurology-residents-in-eeg-interpretation-after-formal-training
#16
Nese Dericioglu, Pınar Ozdemir
EEG is an important tool for neurologists in both diagnosis and classification of seizures. It is not uncommon in clinical practice to see patients who were erroneously diagnosed as epileptic. Most of the time incorrect interpretation of EEG contributes significantly to this problem. In this study, we aimed to investigate the success rate of neurology residents in EEG interpretation after formal training. Eleven neurology residents were included in the study. Duration of EEG training (3 vs 4 months) and time since completion of EEG education were determined...
March 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/28929795/transcranial-direct-current-stimulation-in-depression-and-psychosis-a-systematic-review
#17
Yuma Yokoi, Zui Narita, Tomiki Sumiyoshi
Transcranial direct current stimulation, one of the neuromodulation paradigms, is attracting interest as a novel method to treat various central nervous system disorders. It is safe, portable, and cost-effective, and has been applied experimentally for patients with various neuropsychiatric conditions. For the clinical importance and preliminary positive results, growing number of randomized controlled trials to patients with depression or schizophrenia are reported, followed by systematic reviews and meta-analyses...
March 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/28805079/nonlinear-recurrent-dynamics-and-long-term-nonstationarities-in-eeg-alpha-cortical-activity-implications-for-choosing-adequate-segment-length-in-nonlinear-eeg-analyses
#18
Alexander Cerquera, Madelon A Vollebregt, Martijn Arns
Nonlinear analysis of EEG recordings allows detection of characteristics that would probably be neglected by linear methods. This study aimed to determine a suitable epoch length for nonlinear analysis of EEG data based on its recurrence rate in EEG alpha activity (electrodes Fz, Oz, and Pz) from 28 healthy and 64 major depressive disorder subjects. Two nonlinear metrics, Lempel-Ziv complexity and scaling index, were applied in sliding windows of 20 seconds shifted every 1 second and in nonoverlapping windows of 1 minute...
March 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/28516807/neurofeedback-based-enhancement-of-single-trial-auditory-evoked-potentials-feasibility-in-healthy-subjects
#19
Kathryn Rieger, Marie-Helene Rarra, Nicolas Moor, Laura Diaz Hernandez, Anja Baenninger, Nadja Razavi, Thomas Dierks, Daniela Hubl, Thomas Koenig
Previous studies showed a global reduction of the event-related potential component N100 in patients with schizophrenia, a phenomenon that is even more pronounced during auditory verbal hallucinations. This reduction assumingly results from dysfunctional activation of the primary auditory cortex by inner speech, which reduces its responsiveness to external stimuli. With this study, we tested the feasibility of enhancing the responsiveness of the primary auditory cortex to external stimuli with an upregulation of the event-related potential component N100 in healthy control subjects...
March 2018: 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
#20
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...
March 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
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