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Electroencephalogram

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https://www.readbyqxmd.com/read/29224063/an-efficient-scheme-for-mental-task-classification-utilizing-reflection-coefficients-obtained-from-autocorrelation-function-of-eeg-signal
#1
M M Rahman, M A Chowdhury, S A Fattah
Classification of different mental tasks using electroencephalogram (EEG) signal plays an imperative part in various brain-computer interface (BCI) applications. In the design of BCI systems, features extracted from lower frequency bands of scalp-recorded EEG signals are generally considered to classify mental tasks and higher frequency bands are mostly ignored as noise. However, in this paper, it is demonstrated that high frequency components of EEG signal can provide accommodating data for enhancing the classification performance of the mental task-based BCI...
December 9, 2017: Brain Informatics
https://www.readbyqxmd.com/read/29223740/statistical-models-for-brain-signals-with-properties-that-evolve-across-trials
#2
REVIEW
Hernando Ombao, Mark Fiecas, Chee-Ming Ting, Yin Fen Low
Most neuroscience cognitive experiments involve repeated presentations of various stimuli across several minutes or a few hours. It has been observed that brain responses, even to the same stimulus, evolve over the course of the experiment. These changes in brain activation and connectivity are believed to be associated with learning and/or habituation. In this paper, we present two general approaches to modeling dynamic brain connectivity using electroencephalograms (EEGs) recorded across replicated trials in an experiment...
December 6, 2017: NeuroImage
https://www.readbyqxmd.com/read/29222726/non-auditory-electrophysiological-potentials-preceding-dolphin-biosonar-click-production
#3
James J Finneran, Jason Mulsow, Ryan Jones, Dorian S Houser, Alyssa W Accomando, Sam H Ridgway
The auditory brainstem response to a dolphin's own emitted biosonar click can be measured by averaging epochs of the instantaneous electroencephalogram (EEG) that are time-locked to the emitted click. In this study, averaged EEGs were measured using surface electrodes placed on the head in six different configurations while dolphins performed an echolocation task. Simultaneously, biosonar click emissions were measured using contact hydrophones on the melon and a hydrophone in the farfield. The averaged EEGs revealed an electrophysiological potential (the pre-auditory wave, PAW) that preceded the production of each biosonar click...
December 8, 2017: Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
https://www.readbyqxmd.com/read/29222477/a-novel-eeg-based-spectral-analysis-of-persistent-brain-function-alteration-in-athletes-with-concussion-history
#4
Tamanna T K Munia, Ali Haider, Charles Schneider, Mark Romanick, Reza Fazel-Rezai
The neurocognitive sequelae of a sport-related concussion and its management are poorly defined. Detecting deficits are vital in making a decision about the treatment plan as it can persist one year or more following a brain injury. The reliability of traditional cognitive assessment tools is debatable, and thus attention has turned to assessments based on electroencephalogram (EEG) to evaluate subtle post-concussive alterations. In this study, we calculated neurocognitive deficits combining EEG analysis with three standard post-concussive assessment tools...
December 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29222216/development-of-forced-normalisation-psychosis-with-ethosuximide
#5
Sean Apap Mangion, Fergus Rugg-Gunn
A 50-year-old man with known multidrug resistant coexistent focal and generalised epilepsy was commenced on ethosuximide, with normalisation of his electroencephalogram and cessation of absence seizures. Within 3 weeks, he developed a rapidly worsening paranoid psychosis with visual and olfactory hallucinations. A month after the cessation of ethosuximide and concurrent treatment with olanzapine, his psychosis resolved and permitted reinitiation of ethosuximide at a lower dose without recurrence of psychotic symptoms...
December 7, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/29220351/driver-fatigue-detection-through-multiple-entropy-fusion-analysis-in-an-eeg-based-system
#6
Jianliang Min, Ping Wang, Jianfeng Hu
Driver fatigue is an important contributor to road accidents, and fatigue detection has major implications for transportation safety. The aim of this research is to analyze the multiple entropy fusion method and evaluate several channel regions to effectively detect a driver's fatigue state based on electroencephalogram (EEG) records. First, we fused multiple entropies, i.e., spectral entropy, approximate entropy, sample entropy and fuzzy entropy, as features compared with autoregressive (AR) modeling by four classifiers...
2017: PloS One
https://www.readbyqxmd.com/read/29215577/acute-encephalitis-in-an-adult-with-diffuse-large-b-cell-lymphoma-with-secondary-involvement-of-the-central-nervous-system-infectious-or-non-infectious-etiology
#7
Surinder S Moonga, Kenneth Liang, Burke A Cunha
Both infectious and non-infectious etiologies of acute encephalitis have been described, as well as their specific presentations, diagnostic tests, and therapies. Classic findings of acute encephalitis include altered mental status, fever, and new lesions on neuroimaging or electroencephalogram (EEG). We report an interesting case of a 61-year-old male with a history of diffuse large B-cell lymphoma with secondary involvement of the central nervous system (SCNS-DLBCL). He presented with acute encephalitis: altered mental status, fever, leukocytosis, neuropsychiatric symptoms, multiple unchanged brain lesions on computed tomography scan of the head, and EEG showed mild to moderate diffuse slowing with low-moderate polymorphic delta and theta activity...
December 7, 2017: Journal of Clinical Medicine
https://www.readbyqxmd.com/read/29215453/generalized-periodic-discharges-with-and-without-triphasic-morphology
#8
Ayham M Alkhachroum, Haifa Al-Abri, Alok Sachdeva, Sarita Maturu, Jennifer Waldron, Han Wang, Macym Rizvi, Guadalupe Fernandez-Baca Vaca, Hans O Lüders
PURPOSE: Generalized periodic discharges (GPDs) with a triphasic morphology have been associated with nonepileptic encephalopathies. We conducted the study to assess the reliability in which electroencephalographers can differentiate triphasic from nontriphasic periodic discharges and to evaluate for the presence of electroencephalogram and clinical characteristics that are associated with a higher risk of seizures. METHODS: We studied prospectively 92 patients between May 2016 and February 2017...
November 27, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/29213509/comparative-analysis-of-the-electroencephalogram-in-patients-with-alzheimer-s-disease-diffuse-axonal-injury-patients-and-healthy-controls-using-loreta-analysis
#9
Jéssica Natuline Ianof, Francisco José Fraga, Leonardo Alves Ferreira, Renato Teodoro Ramos, José Luiz Carlos Demario, Regina Baratho, Luís Fernando Hindi Basile, Ricardo Nitrini, Renato Anghinah
Alzheimer's disease (AD) is a dementia that affects a large contingent of the elderly population characterized by the presence of neurofibrillary tangles and senile plaques. Traumatic brain injury (TBI) is a non-degenerative injury caused by an external mechanical force. One of the main causes of TBI is diffuse axonal injury (DAI), promoted by acceleration-deceleration mechanisms. Objective: To understand the electroencephalographic differences in functional mechanisms between AD and DAI groups...
April 2017: Dementia & Neuropsychologia
https://www.readbyqxmd.com/read/29209582/white-matter-tracts-in-patients-with-temporal-lobe-epilepsy-pre-and-postoperative-assessment
#10
Fateme Salehi, Manas Sharma, Terry M Peters, Ali R Khan
Patients with intractable temporal lobe epilepsy (TLE) undergo surgical resection of the anterior temporal lobe. Preoperative assessment of TLE patients involves a multidisciplinary assessment and may involve the use of invasive electroencephalogram (EEG) recording for lateralization of seizure focus in ambiguous cases. Understanding the white matter fibre tracts affected in TLE may assist in preoperative lateralization and planning. We studied pre- and postoperative white matter fibre tract changes in six patients with TLE who underwent surgical resection...
October 1, 2017: Curēus
https://www.readbyqxmd.com/read/29209491/a-3d-printed-sensor-for-monitoring-biosignals-in-small-animals
#11
Sung-Joon Cho, Donghak Byun, Tai-Seung Nam, Seok-Yong Choi, Byung-Geun Lee, Myeong-Kyu Kim, Sohee Kim
Although additive manufacturing technologies, also known as 3D printing, were first introduced in the 1980s, they have recently gained remarkable popularity owing to decreased costs. 3D printing has already emerged as a viable technology in many industries; in particular, it is a good replacement for microfabrication technology. Microfabrication technology usually requires expensive clean room equipment and skilled engineers; however, 3D printing can reduce both cost and time dramatically. Although 3D printing technology has started to emerge into microfabrication manufacturing and medical applications, it is typically limited to creating mechanical structures such as hip prosthesis or dental implants...
2017: Journal of Healthcare Engineering
https://www.readbyqxmd.com/read/29209190/classification-of-eeg-signals-based-on-pattern-recognition-approach
#12
Hafeez Ullah Amin, Wajid Mumtaz, Ahmad Rauf Subhani, Mohamad Naufal Mohamad Saad, Aamir Saeed Malik
Feature extraction is an important step in the process of electroencephalogram (EEG) signal classification. The authors propose a "pattern recognition" approach that discriminates EEG signals recorded during different cognitive conditions. Wavelet based feature extraction such as, multi-resolution decompositions into detailed and approximate coefficients as well as relative wavelet energy were computed. Extracted relative wavelet energy features were normalized to zero mean and unit variance and then optimized using Fisher's discriminant ratio (FDR) and principal component analysis (PCA)...
2017: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/29208491/feedback-information-and-the-reward-positivity
#13
Jeffrey Cockburn, Clay B Holroyd
The reward positivity is a component of the event-related brain potential (ERP) sensitive to neural mechanisms of reward processing. Multiple studies have demonstrated that reward positivity amplitude indices a reward prediction error signal that is fundamental to theories of reinforcement learning. However, whether this ERP component is also sensitive to richer forms of performance information important for supervised learning is less clear. To investigate this question, we recorded the electroencephalogram from participants engaged in a time estimation task in which the type of error information conveyed by feedback stimuli was systematically varied across conditions...
December 2, 2017: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/29204006/knowledge-attitude-and-practice-among-practitioners-regarding-epilepsy-in-bhutan-a-rural-and-a-remote-country
#14
Devender Bhalla
Purpose: Epilepsy is a major neurological disorder with many countries as scientifically silent and little-to-nothing known on various aspects of epilepsy. Methods: Taking background of a first multinational seminar on epilepsy in Bhutan and a short valid questionnaire pertaining to various aspects of epilepsy, before participation. Results: Large participation was achieved (76 out of 87 approached, 87.3%; 53.0% males). Based on the responses of 76...
October 2017: Journal of Neurosciences in Rural Practice
https://www.readbyqxmd.com/read/29201197/calcitonin-gene-related-peptide-has-protective-effect-on-brain-injury-induced-by-heat-stroke-in-rats
#15
Cheng-Xiang Lu, Ting Qiu, Zhi-Feng Liu, Lei Su, Biao Cheng
Heat stroke often leads to multiple organ dysfunction syndrome (MODS) with a neurological morbidity of 30%. Current studies suggested that pathophysiological responses to heat stroke may be due to a systemic inflammatory response syndrome and a series of peptidergic nerve reactions. The mechanisms underlying the high neurological morbidity in heat stroke have remained largely elusive. In recent years, calcitonin gene-related peptide (CGRP) has been considered to have a positive role in central nervous system injury...
November 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29199490/the-role-of-electroencephalogram-in-neonatal-seizure-detection
#16
Francesco Pisani, Elena Pavlidis
The role of EEG in neonatal seizure detection is well-established, being the multichannel video-EEG the gold standard. However, in the clinical practice often amplitude integrated EEG (aEEG) is used, in order to overcome the difficulties related to EEG use. Areas covered: An overview regarding neonatal seizures, current tools used to detect these (multichannel EEG versus aEEG) with respective strenghts and limitations, and some tools that can implement the use of multichannel EEG in the NICU. Expert commentary: Multichannel video-EEG is still a gold standard for seizure detection...
December 4, 2017: Expert Review of Neurotherapeutics
https://www.readbyqxmd.com/read/29197198/cardiovascular-disease-risk-factors-in-patients-with-posttraumatic-stress-disorder-ptsd-a-narrative-review
#17
Marina Šagud, Nenad Jakšić, Bjanka Vuksan-Ćusa, Mladen Lončar, Ivana Lončar, Alma Mihaljević Peleš, Davor Miličić, Miro Jakovljević
Posttraumatic stress disorder (PTSD) is a chronic condition related to severe stress and trauma. There is a mounting evidence about increased prevalence and mortality from cardiovascular diseases (CVD) in patients with PTSD. This review summarizes the current data on possible relations between PTSD and increased risks of CVD, including biological, psychological and behavioral factors. Biological factors refer to increased prevalence of metabolic syndrome (MetS), hypertension, elevation of pro-inflammatory cytokines and homocysteine levels...
December 2017: Psychiatria Danubina
https://www.readbyqxmd.com/read/29194516/deficits-in-cortical-suppression-during-vocalization-are-associated-with-structural-abnormalities-in-the-arcuate-fasciculus-in-early-illness-schizophrenia-and-clinical-high-risk-for-psychosis
#18
Thomas J Whitford, Lena K L Oestreich, Judith M Ford, Brian J Roach, Rachel L Loewy, Barbara K Stuart, Daniel H Mathalon
Self-generated speech produces a smaller N1 amplitude in the auditory-evoked potential than externally generated speech; this phenomenon is known as N1-suppression. Schizophrenia patients show less N1-suppression than healthy controls. This failure to self-suppress may underlie patients' characteristic tendency to misattribute self-generated thoughts and actions to external sources. While the cause of N1-suppression deficits to speech in schizophrenia remains unclear, structural damage to the arcuate fasciculus is a candidate, due to its ostensible role in transmitting the efference copy of the motor plan to speak...
November 29, 2017: Schizophrenia Bulletin
https://www.readbyqxmd.com/read/29190525/cognitive-reserve-modulates-attention-processes-in-healthy-elderly-and-amnestic-mild-cognitive-impairment-an-event-related-potential-study
#19
Lihua Gu, Jiu Chen, Lijuan Gao, Hao Shu, Zan Wang, Duan Liu, Yanna Yan, Shijiang Li, Zhijun Zhang
OBJECTIVES: The study aimed to investigate and compare the effect of cognitive reserve (CR) on brain activation in healthy controls (HC) and amnestic mild cognitive impairment (aMCI) patients during 0-back and 1-back tasks measured by event-related potential (ERP). METHODS: The study recorded 85 subjects (39 aMCI patients and 46 their matched controls) with a 64-channel electroencephalogram (EEG). Subjects performed 0- and 1-back tasks. RESULTS: Compared to HC, aMCI patients showed reduced accuracy, delayed mean correct response time (RT) and decreased P300 amplitude at central-parietal and parietal electrodes...
November 10, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29187686/-portal-systemic-encephalopathy-with-bilateral-thalamic-and-internal-capsule-lesions-using-diffusion-weighted-mri-in-a-super-aged-patient
#20
Michiaki Matsuda, Shinpei Takesako, Mitsuhiro Nakazaki, Toru Nandate, Fujio Umehara
We describe the case of a 90-year-old woman who was hospitalized in July 2016 and subsequently experienced a sudden decline in consciousness level resulting in a state of deep coma. Involuntary movements were not observed, and bilateral Babinski signs were inconclusive. Diffusion-weighted MRI (DWI) of the brain showed bilateral hyperintensity in the thalamus and internal capsule, laboratory testing detected high levels of plasma ammonia, and an electroencephalogram showed delta waves and triphasic waves predominantly in the frontal lobe...
November 28, 2017: Rinshō Shinkeigaku, Clinical Neurology
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