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    576 results match your criteria Clinical EEG and Neuroscience [Journal]

    1 OF 12

    Negative Symptoms and Reward Disturbances in Schizophrenia Before and After Antipsychotic Monotherapy.
    Clin EEG Neurosci 2017 Nov 1:1550059417744120. Epub 2017 Nov 1.
    1 Center for Neuropsychiatric Schizophrenia Research (CNSR) & Centre for Clinical Intervention and Neuropsychiatric Schizophrenia Research (CINS), Copenhagen University Hospital, Mental Health Centre Glostrup, Denmark.
    Background: Negative symptoms (NS) are a central part of the symptomatology of schizophrenia, which is highly correlated to the functional outcome. Disturbances of the brain reward system are suggested to be central in the pathogenesis of NS by decreasing motivation and hedonic experiences. In this study, we compared reward-related brain activity in patients improving and not improving in NS after treatment with amisulpride. Read More

    Exploration of the Pathophysiology of Chronic Pain Using Quantitative EEG Source Localization.
    Clin EEG Neurosci 2017 Nov 1:1550059417736444. Epub 2017 Nov 1.
    5 Departments of Neurology and Radiology, NYU Medical Center, New York, NY, USA.
    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. Read More

    The Difficulty in Finding Relationships Between ERPs and Clinical Symptoms of Schizophrenia.
    Clin EEG Neurosci 2017 Oct 1:1550059417737416. Epub 2017 Oct 1.
    1 San Francisco Veterans Administration Medical Center, San Francisco, CA, USA.
    It has been surprisingly difficult to find associations between neural signatures of schizophrenia and the symptoms that define it. That is, many of the legacy components of the event-related potential (ERP)- P50, N100, P200, P300-are reduced in patients with schizophrenia, in first-degree relatives of patients with schizophrenia, in schizophrenia patients early in their illness, and even in people at clinical high risk for schizophrenia. Nevertheless, these ERP components tend to be relatively insensitive to symptoms. Read More

    Evaluating Brain-Computer Interface Performance in an ALS Population: Checkerboard and Color Paradigms.
    Clin EEG Neurosci 2017 Oct 1:1550059417737443. Epub 2017 Oct 1.
    1 Department of Psychology, East Tennessee State University, Johnson City TN, USA.
    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. Read More

    Features of Simultaneous Scalp and Intracranial EEG That Predict Localization of Ictal Onset Zone.
    Clin EEG Neurosci 2017 Oct 1:1550059417738688. Epub 2017 Oct 1.
    2 University of Pittsburgh Comprehensive Epilepsy Center (UPCEC), University of Pittsburgh Medical Center, Pittsburgh, PA, USA.
    Objective: To assess the utility of simultaneous scalp EEG in patients with focal epilepsy undergoing intracranial EEG evaluation after a detailed presurgical testing, including an inpatient scalp video EEG evaluation.

    Methods: Patients who underwent simultaneous scalp and intracranial EEG (SSIEEG) monitoring were classified into group 1 or 2 depending on whether the seizure onset zone was delineated or not. Seizures were analyzed using the following 3 EEG features at the onset of seizures latency, location, and pattern. Read More

    The Success Rate of Neurology Residents in EEG Interpretation After Formal Training.
    Clin EEG Neurosci 2017 Oct 1:1550059417736445. Epub 2017 Oct 1.
    2 Department of Biostatistics, Hacettepe University, Ankara, Turkey.
    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. Read More

    Neuronal Dysexcitability May Be a Biomarker of Migraine: A Visual Evoked Potential Study.
    Clin EEG Neurosci 2017 Sep 1:1550059417734106. Epub 2017 Sep 1.
    1 Department of Neurology, Sanjay Gandhi Post Graduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India.
    We report neuronal sensitization and impaired habituation in migraine using pattern reversal visual evoked potential (PRVEP) and correlate these with clinical characteristics of migraine. Sixty-five migraineurs and 30 healthy controls were included. A detailed clinical examination was done and migraine characteristics, including migraine trigger, photophobia, phonophobia, and allodynia were noted. Read More

    Peri-ictal Prone Position Is Associated With Independent Risk Factors For Sudden Unexpected Death In Epilepsy: A Controlled Video-EEG Monitoring Unit Study.
    Clin EEG Neurosci 2017 Sep 1:1550059417733385. Epub 2017 Sep 1.
    1 Departments of Neurology and Clinical Neurophysiology, Istanbul University, Istanbul Faculty of Medicine, Istanbul, Turkey.
    Introduction: Sudden unexpected death in epilepsy (SUDEP) is a major cause of death in patients with chronic drug-resistant epilepsy, and peri-ictal prone position has been elucidated as a risk factor for SUDEP. We aimed to investigate consecutive patients in peri-ictal prone positions in our video EEG monitoring (VEM) unit and compare patients with and without peri-ictal prone position to emphasize its relationship with other independent risk factors for SUDEP.

    Methods: We retrospectively screened all patients with peri-ictal prone position who underwent VEM for a 10-year period and these patients constituted the prone (+) group. Read More

    Neural Processing of Musical and Vocal Emotions Through Cochlear Implants Simulation.
    Clin EEG Neurosci 2017 Sep 1:1550059417733386. Epub 2017 Sep 1.
    1 International Laboratory for Brain Music and Sound Research, Center for Research on Brain, Language and Music, Department of Psychology, University of Montreal, Montreal, Quebec, Canada.
    Cochlear implants (CIs) partially restore the sense of hearing in the deaf. However, the ability to recognize emotions in speech and music is reduced due to the implant's electrical signal limitations and the patient's altered neural pathways. Electrophysiological correlations of these limitations are not yet well established. Read More

    Transcranial Direct Current Stimulation in Depression and Psychosis: A Systematic Review.
    Clin EEG Neurosci 2017 Sep 1:1550059417732247. Epub 2017 Sep 1.
    1 National Center of Neurology and Psychiatry, Tokyo, Japan.
    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. Read More

    Maturation of Binocular, Monocular Grating Acuity and of the Visual Interocular Difference in the First 2 Years of Life.
    Clin EEG Neurosci 2017 Aug 1:1550059417723804. Epub 2017 Aug 1.
    1 Laboratório de Psicofisiologia Sensorial, Departamento de Psicologia Experimental, Instituto de Psicologia, Universidade de São Paulo, São Paulo, Brazil.
    The sweep visual evoked potential method (sVEP) is a powerful tool for measurement of visual acuity in infants. Despite the applicability and reliability of the technique in measuring visual functions the understanding of sVEP acuity maturation and how interocular difference of acuity develops in early infancy, as well as the availability of normality ranges, are rare in the literature. We measured binocular and monocular sVEPS acuities in 481 healthy infants aged from birth to 24 months without ophthalmological diseases. Read More

    The Nature of EEG Reactivity to Light, Sound, and Pain Stimulation in Neurosurgical Comatose Patients Evaluated by a Quantitative Method.
    Clin EEG Neurosci 2017 Nov 28;48(6):428-437. Epub 2017 Aug 28.
    1 Department of Clinical Neurophysiology, Aarhus University Hospital, Aarhus, Denmark.
    EEG reactivity (EEG-R) is regarded as an important parameter in coma prognosis but knowledge is sparse on the nature of EEG changes due to different kinds of stimulation and their prognostic significance. EEG-R was quantified in a study of 39 comatose neurosurgical patients. Six 30-second standardized visual, auditory, and painful stimulations were applied. Read More

    Do Video-EEG Monitoring Findings in ICU Patients With Acute Stroke Predict Development of Seizures and Survival During Follow-up?
    Clin EEG Neurosci 2017 Nov 28;48(6):417-421. Epub 2017 Aug 28.
    1 Hacettepe University Faculty of Medicine, Ankara, Turkey.
    Purpose: Ischemic or hemorrhagic stroke are among the most common causes of seizures, especially in the elderly. EEG is the only technique that can detect epileptiform abnormalities (EA) and nonconvulsive status epilepticus (NCSE), which may negatively affect recovery of these patients. Herein we aimed to investigate the potential predictive value of long-term EEG findings in terms of poststroke seizures (PSS) and survival, in stroke patients followed up in the neurological intensive care unit (NICU). Read More

    Nonlinear Recurrent Dynamics and Long-Term Nonstationarities in EEG Alpha Cortical Activity: Implications for Choosing Adequate Segment Length in Nonlinear EEG Analyses.
    Clin EEG Neurosci 2017 Aug 1:1550059417724695. Epub 2017 Aug 1.
    3 Research Institute Brainclinics, Nijmegen, The Netherlands.
    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. Read More

    Retrospective Analysis of Nonepileptic Patients With Isolated Epileptiform Discharges Treated With Anticonvulsants.
    Clin EEG Neurosci 2017 Sep 1;48(5):322-326. Epub 2017 Mar 1.
    3 Department of Clinical Psychology, Saybrook University, Oakland, CA, USA.
    Many antiepileptic drugs (AEDs) have been tested on nonepileptic patients with a variety of diagnoses. The Food and Drug Administration has only approved certain AEDs for a small number of psychiatric conditions. There are few studies of nonepileptic patients that recommend an empirical trial of AEDs when isolated epileptiform discharges (IEDs) are identified in the electroencephalogram (EEG). Read More

    Longitudinal Dynamics of 3-Dimensional Components of Selfhood After Severe Traumatic Brain Injury: A qEEG Case Study.
    Clin EEG Neurosci 2017 Sep 1;48(5):327-337. Epub 2017 Feb 1.
    1 BM-Science-Brain and Mind Technologies Research Centre, Espoo, Finland.
    In this report, we describe the case of a patient who sustained extremely severe traumatic brain damage with diffuse axonal injury in a traffic accident and whose recovery was monitored during 6 years. Specifically, we were interested in the recovery dynamics of 3-dimensional components of selfhood (a 3-dimensional construct model for the complex experiential selfhood has been recently proposed based on the empirical findings on the functional-topographical specialization of 3 operational modules of brain functional network responsible for the self-consciousness processing) derived from the electroencephalographic (EEG) signal. The analysis revealed progressive (though not monotonous) restoration of EEG functional connectivity of 3 modules of brain functional network responsible for the self-consciousness processing, which was also paralleled by the clinically significant functional recovery. Read More

    Childhood-Onset Epileptic Encephalopathy Associated With Isolated Focal Cortical Dysplasia and a Novel TSC1 Germline Mutation.
    Clin EEG Neurosci 2017 Mar 1:1550059417697841. Epub 2017 Mar 1.
    1 Department of Pediatric Neurology, Developmental Medicine and Social Pediatrics, Dr. von Haunersches Children's Hospital, Ludwig-Maximilians-University, Munich, Germany.
    Tuberous sclerosis complex (TSC) is an autosomal-dominant inheritable neurocutaneous disease due to mutations within the TSC1 and TSC2 genes. Many patients present with West syndrome, a severe epilepsy syndrome characterized by the triad of infantile spasms, an interictal electroencephalogram (EEG) pattern termed hypsarrhythmia (continuous slow activity with an amplitude higher than 300 µV and multiregional spikes/polyspikes/sharp waves) and developmental regression. In this study, we report on a previously healthy patient with positive family history of epilepsy with new-onset epileptic encephalopathy at the age of 9 years. Read More

    Local Differences in Computational Sleep Depth Parameters in Healthy School-aged Children.
    Clin EEG Neurosci 2017 Nov 5;48(6):393-402. Epub 2017 Jul 5.
    3 Department of Pediatrics, Tampere University Hospital, Tampere, Finland.
    Objective: Slow wave sleep in children reflects several processes, such as sleep pressure, synaptic density, and cortical maturation. Deep sleep in children is abundant and our aim was to discover whether examining electroencephalography (EEG) mean frequency would help separate these processes.

    Methods: Sleep EEG of 28 generally healthy 7- to 11-year-old children (14 first graders, 14 third graders, 14 girls, 14 boys) was analyzed. Read More

    High-Intensity Chronic Stroke Motor Imagery Neurofeedback Training at Home: Three Case Reports.
    Clin EEG Neurosci 2017 Nov 5;48(6):403-412. Epub 2017 Jul 5.
    1 Neuropsychology Lab, Department of Psychology, European Medical School, University of Oldenburg, Oldenburg, Germany.
    Motor imagery (MI) with neurofeedback has been suggested as promising for motor recovery after stroke. Evidence suggests that regular training facilitates compensatory plasticity, but frequent training is difficult to integrate into everyday life. Using a wireless electroencephalogram (EEG) system, we implemented a frequent and efficient neurofeedback training at the patients' home. Read More

    Accuracy of Limited-Montage Electroencephalography in Monitoring Postanoxic Comatose Patients.
    Clin EEG Neurosci 2017 Nov 22;48(6):422-427. Epub 2017 Jun 22.
    1 Department of Neurology, Massachusetts General Hospital, Boston, MA, USA.
    Background: Continuous EEG (cEEG) monitoring may help to identify the small percentage of adults with hypoxic-ischemic encephalopathy (HIE) who will regain consciousness if allowed sufficient time. However, the limited yield in this population has led some to question the cost-effectiveness cEEG monitoring in this population. We hypothesized that limited-montage cEEG could provide essentially the same neurophysiologic information at lower cost. Read More

    Comparing EEG Nonlinearity in Deficit and Nondeficit Schizophrenia Patients: Preliminary Data.
    Clin EEG Neurosci 2017 Nov 16;48(6):376-382. Epub 2017 Jun 16.
    4 Department of Psychiatry, University of Missouri-Kansas City, Kansas City, USA.
    Electroencephalogram (EEG) contains valuable information obtained noninvasively that can be used for assessment of brain's processing capacity of patients with psychiatric disorders. The purpose of the present work was to evaluate possible differences in EEG complexity between deficit (DS) and nondeficit (NDS) subtypes of schizophrenia as a reflection of the cognitive processing capacities in these groups. A particular nonlinear metric known as Lempel-Ziv complexity (LZC) was used as a computational tool in order to determine the randomness in EEG alpha band time series from 3 groups (deficit schizophrenia [n = 9], nondeficit schizophrenia [n = 10], and healthy controls [n = 10]) according to time series randomness. Read More

    Is There an Association Between Mismatch Negativity and Cortical Thickness in Schizophrenia Patients?
    Clin EEG Neurosci 2017 Nov 14;48(6):383-392. Epub 2017 Jun 14.
    1 Department of Brain and Cognitive Sciences, Seoul National University College of Natural Sciences, Seoul, Republic of Korea.
    Introduction: Mismatch negativity (MMN) is thought to reflect preattentive, automatic auditory processing. Reduced MMN amplitude is among the most robust findings in schizophrenia research. MMN generators have been shown to be located in the temporal and frontal cortices, which are key areas in the pathophysiology of schizophrenia. Read More

    Determining Electrode Placement for Transcranial Direct Current Stimulation: A Comparison of EEG- Versus TMS-Guided Methods.
    Clin EEG Neurosci 2017 Nov 22;48(6):367-375. Epub 2017 May 22.
    1 Department of Physical Medicine and Rehabilitation, Program in Rehabilitation Science, University of Minnesota, Minneapolis, MN, USA.
    Transcranial direct current stimulation (tDCS) is increasingly researched as an adjuvant to motor rehabilitation for children with hemiparesis. The optimal method for the primary motor cortex (M1) somatotopic localization for tDCS electrode placement has not been established. The objective, therefore, was to determine the location of the M1 derived using the 10/20 electroencephalography (EEG) system and transcranial magnetic stimulation (TMS) in children with hemiparesis (CWH) and a comparison group of typically developing children (TDC). Read More

    Baseline Sleep Efficiency and Arousal Index Do Not Predict Who Will Benefit From Sedatives in Improving Positive Airway Pressure Adherence in Sleep Apnea to 90.
    Clin EEG Neurosci 2017 May 1:1550059417709882. Epub 2017 May 1.
    1 Sleep & Attention Disorders Institute, Sterling Heights, MI, USA.
    Positive airway pressure (PAP) is the preferred treatment for obstructive sleep apnea (OSA), but adherence is low. Educational or ongoing supportive intervention improves the number of PAP adherent patients from the 50% to the 70% range. A common side effect of PAP is increased awakenings. Read More

    New-Onset Fixation-Off Sensitivity or Scotosensitivity in an Adult Male After Bilateral Embolic Strokes of the Parietal and Occipital Regions.
    Clin EEG Neurosci 2017 Nov 22;48(6):413-416. Epub 2017 May 22.
    1 Department of Neurology, MedStar Georgetown University Hospital, Washington, DC, USA.
    A 50-year old male suffered new-onset clinical and subclinical seizures provoked by acute bilateral embolic strokes in the parietal and occipital regions as a complication of aortic valve replacement surgery. After successful treatment of these refractory symptomatic seizures with intravenous propofol and antiseizure medications, video-EEG recordings revealed acute and transient fixation-off sensitivity or scotosensitivity that resolved within 10 weeks. Read More

    Neurofeedback-Based Enhancement of Single Trial Auditory Evoked Potentials: Feasibility in Healthy Subjects.
    Clin EEG Neurosci 2017 May 1:1550059417708935. Epub 2017 May 1.
    1 Translational Research Center, University Hospital of Psychiatry, University of Bern, Bern, Switzerland.
    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. Read More

    Prepulse Inhibition of the Auditory Off-Response: A Magnetoencephalographic Study.
    Clin EEG Neurosci 2017 May 1:1550059417708914. Epub 2017 May 1.
    1 Department of Neuropsychiatry, Mie University Graduate School of Medicine, Tsu, Japan.
    A weak preceding sound stimulus attenuates the startle response evoked by an intense sound stimulus. Like startle reflexes, change-related auditory responses are suppressed by a weak leading stimulus (ie, a prepulse). We aim to examine whether a prepulse inhibits cerebral responses to the sound offset and how the prepulse magnitude affects the degree of the prepulse inhibition (PPI). Read More

    The Characteristics and Long-Term Course of Epilepsy in Lipoid Proteinosis: A Spectrum From Mild to Severe Seizures in Relation to ECM1 Mutations.
    Clin EEG Neurosci 2017 Apr 1:1550059417705280. Epub 2017 Apr 1.
    1 Departments of Neurology and Clinical Neurophysiology, Faculty of Medicine, Istanbul University, Istanbul, Turkey.
    Lipoid proteinosis (LP) is a rare autosomal recessive disease characterized by deposition of hyaline material in skin and mucosae. Epilepsy, as an extracutaneous manifestation associated with typical mesial temporal calcifications, has already been identified, but its characteristics and long-term prognosis have not been thoroughly investigated. We included 7 consecutive patients with LP with typical intracranial calcifications out of 16 patients with ECM1 mutations and investigated the semiologic features, ictal and interictal EEG findings, and long-term prognosis of epilepsy in this genodermatosis. Read More

    Frontal Intermittent Rhythmic Delta Activity (FIRDA) in the Neurological Intensive Care.
    Clin EEG Neurosci 2017 Jan 1:1550059416688108. Epub 2017 Jan 1.
    1 Department of Neurology, Faculty of Medicine, Hacettepe University, Ankara, Turkey.
    Introduction: Frontal intermittent rhythmic delta activity (FIRDA), a transient rhythmic slow wave pattern over the anterior EEG leads, has been reported in a wide variety of cerebral lesions and different metabolic disturbances. Few authors have analyzed the frequency and clinical significance of FIRDA in the critical care setting. We aimed to better understand these issues in our intensive care cohort and if possible, try to delineate its underlying mechanisms. Read More

    Local and Widely Distributed EEG Activity in Schizophrenia With Prevalence of Negative Symptoms.
    Clin EEG Neurosci 2017 Sep 5;48(5):307-315. Epub 2017 Jan 5.
    1 Laboratory of Neurobiology of Action Programming, N.P. Bechtereva Institute of the Human Brain of the Russian Academy of Sciences, St Petersburg, Russia.
    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. Read More

    Application and Evaluation of Independent Component Analysis Methods to Generalized Seizure Disorder Activities Exhibited in the Brain.
    Clin EEG Neurosci 2017 Jul 11;48(4):295-300. Epub 2016 Nov 11.
    1 School of Electrical Sciences, Karunya University, Coimbatore, Tamil Nadu India.
    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. Read More

    Toward an Attention-Based Diagnostic Tool for Patients With Locked-in Syndrome.
    Clin EEG Neurosci 2016 Nov 7. Epub 2016 Nov 7.
    Coma Science Group, GIGA-Research, CHU University Hospital of Liege, Liege, Belgium.
    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. Read More

    Serial EEG Monitoring in a Patient With Anti-NMDA Receptor Encephalitis.
    Clin EEG Neurosci 2017 Jul 9;48(4):301-303. Epub 2016 Nov 9.
    1 EEG Monitoring Unit, Neurology, Barnes Jewish Hospital, St Louis, MO, USA.
    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. Read More

    Beta Responses in Healthy Elderly and in Patients With Amnestic Mild Cognitive Impairment During a Task of Temporal Orientation of Attention.
    Clin EEG Neurosci 2016 Nov 2. Epub 2016 Nov 2.
    Research Unit in Affective and Social Neuroscience, Catholic University of the Sacred Heart, Milan, Italy
    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). Read More

    Post-Encephalitic Parkinsonism and Sleep Disorder Responsive to Immunological Treatment: A Case Report.
    Clin EEG Neurosci 2016 Oct 25;47(4):324-329. Epub 2016 Apr 25.
    Institute of Neurology, Catholic University, Rome.
    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. Read More

    Low-Complexity Discriminative Feature Selection From EEG Before and After Short-Term Memory Task.
    Clin EEG Neurosci 2016 Oct 25;47(4):291-297. Epub 2016 Feb 25.
    Research Institute, ICT, Tehran, Iran.
    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. Read More

    Brain Network Connectivity and Topological Analysis During Voluntary Arm Movements.
    Clin EEG Neurosci 2016 Oct 5;47(4):276-290. Epub 2015 Aug 5.
    Department of Computer Science, University of Verona, Verona, Italy
    Functional connectivity estimates the temporal synchrony among functionally homogeneous brain regions based on the assessment of the dynamics of topologically localized neurophysiological responses. The aim of this study was to investigate task-related changes in brain activity and functional connectivity by applying different methods namely event-related desynchronization (ERD), coherence, and graph-theoretical analysis to electroencephalographic (EEG) recordings, for comparing their respective descriptive power and complementarity. As it is well known, ERD provides an estimate of differences in power spectral densities between active (or task) and rest conditions, functional connectivity allows assessing the level of synchronization between the signals recorded at different scalp locations and graph analysis enables the estimation of the functional network features and topology. Read More

    Is Using Threshold-Crossing Method and Single Type of Features Sufficient to Achieve Realistic Application of Seizure Prediction?
    Clin EEG Neurosci 2016 Oct 8;47(4):305-316. Epub 2015 Jun 8.
    The Key Laboratory of Biomedical Information Engineering of Ministry of Education, and Institute of Biomedical Engineering, School of Life Science and Technology, Xi'an Jiaotong University, Xi'an, China
    Objective This study aims to verify whether the simple threshold-crossing method can work well enough to achieve the realistic application of seizure prediction on the basis of a large public database, and examines how a more complex classifier can improve prediction performance. It also verified whether the combination of multiple types of features with a complex classifier can improve prediction performance. Method Phase synchronization and spectral power features were extracted from electroencephalogram recordings. Read More

    The Relationship between Parameters of Long-Latency Evoked Potentials in a Multisensory Design.
    Clin EEG Neurosci 2016 Oct 15;47(4):260-265. Epub 2015 Apr 15.
    Centro de Investigaciones Biomédicas, Cuerpo Académico Biomedicina, Universidad Autónoma de Campeche, Campeche, México.
    In previous papers, we have shown that parameters of the omitted stimulus potential (OSP), which occurs at the end of a train of sensory stimuli, strongly depend on the modality. A train of stimuli also produces long-latency evoked potentials (LLEP) at the beginning of the train. This study is an extension of the OSP research, and it tested the relationship between parameters (ie, rate of rise, amplitude, and peak latency) of the P2 waves when trains of auditory, visual, or somatosensory stimuli were applied. Read More

    Periodic Epileptiform Discharges in Children With Advanced Stages of Progressive Myoclonic Epilepsy.
    Clin EEG Neurosci 2016 Oct 30;47(4):317-323. Epub 2015 Mar 30.
    Department of Pediatrics, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan.
    Huntington's disease (HD) and dentatorubral-pallidoluysian atrophy (DRPLA) are monogenic forms of neurodegenerative disorders with autosomal dominant inheritance. Compared with adult-onset HD and DRPLA, children with these disorders are more severely affected and are known to manifest the devastating symptoms of progressive myoclonic epilepsy (PME) syndrome. In this report, we present a 6-year-old girl with HD from a family, and 2 siblings with DRPLA from another unrelated family. Read More

    Protocol Design Challenges in the Detection of Awareness in Aware Subjects Using EEG Signals.
    Clin EEG Neurosci 2016 Oct 8;47(4):266-275. Epub 2014 Dec 8.
    Laboratoire de Mathématiques de Besançon, Besançon, France
    Recent studies have evidenced serious difficulties in detecting covert awareness with electroencephalography-based techniques both in unresponsive patients and in healthy control subjects. This work reproduces the protocol design in two recent mental imagery studies with a larger group comprising 20 healthy volunteers. The main goal is assessing if modifications in the signal extraction techniques, training-testing/cross-validation routines, and hypotheses evoked in the statistical analysis, can provide solutions to the serious difficulties documented in the literature. Read More

    The Fingerprint of Rapid Eye Movement: Its Algorithmic Detection in the Sleep Electroencephalogram Using a Single Derivation.
    Clin EEG Neurosci 2016 Oct 13;47(4):298-304. Epub 2014 Nov 13.
    Department of Neurology, LSU Health Sciences Center, Shreveport, LA, USA
    The strong associations of rapid eye movement (REM) sleep with dreaming and memory consolidation imply the existence of REM-specific brain electrical activity, notwithstanding the visual similarity of the electroencephalograms (EEGs) in REM and wake states. Our goal was to detect REM sleep by means of algorithmic analysis of the EEG. We postulated that novel depth and fragmentation variables, defined in relation to temporal changes in the signal (recurrences), could be statistically combined to allow disambiguation of REM epochs. Read More

    Medication Effects on EEG Biomarkers in Attention-Deficit/Hyperactivity Disorder.
    Clin EEG Neurosci 2017 Jul 25;48(4):246-250. Epub 2016 Oct 25.
    2 Department of Psychology, Uskudar University, Istanbul, Turkey.
    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. Read More

    Generalizability of Frequency Weighting Curve for Extraction of Spectral Drowsy Component From the EEG Signals Recorded in Eyes-Closed Condition.
    Clin EEG Neurosci 2017 Jul 11;48(4):259-269. Epub 2016 Oct 11.
    1 Research Institute for Molecular Biology and Biophysics, Novosibirsk, Russia.
    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. Read More

    Decrease of Delta Oscillatory Responses in Cognitively Normal Parkinson's Disease.
    Clin EEG Neurosci 2017 Sep 31;48(5):355-364. Epub 2016 Aug 31.
    2 Department of Neurosciences, Dokuz Eylül University, Izmir, Turkey.
    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. Read More

    Prognostic Utility of Clinical Epilepsy Severity Score Versus Pretreatment Hypsarrhythmia Scoring in Children With West Syndrome.
    Clin EEG Neurosci 2017 Jul 31;48(4):280-287. Epub 2016 Aug 31.
    1 Department of Pediatrics, All India Institute of Medical Sciences, New Delhi, India.
    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. Read More

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