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Quantitative eeg

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https://www.readbyqxmd.com/read/28920904/modeling-the-nonlinear-cortical-response-in-eeg-evoked-by-wrist-joint-manipulation
#1
Martijn P Vlaar, Georgios Birpoutsoukis, John Lataire, Maarten Schoukens, Alfred C Schouten, Johan Schoukens, Frans C T van der Helm
Joint manipulation elicits a response from the sensors in the periphery which, via the spinal cord, arrives in the cortex. The average evoked cortical response recorded using electroencephalography was shown to be highly nonlinear; a linear model can only explain 10% of the variance of the evoked response, and over 80% of the response is generated by nonlinear behavior. The goal of this study is to obtain a nonparametric nonlinear dynamic model, which can consistently explain the recorded cortical response requiring little a priori assumptions about model structure...
September 13, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28919879/automated-online-quantification-method-for-18-f-fdg-positron-emission-tomography-ct-improves-detection-of-the-epileptogenic-zone-in-patients-with-pharmacoresistant-epilepsy
#2
Vanessa Cristina Mendes Coelho, Marcia E Morita, Barbara J Amorim, Celso Darío Ramos, Clarissa L Yasuda, Helder Tedeschi, Enrico Ghizoni, Fernando Cendes
AIMS: To assess the validity of an online method to quantitatively evaluate cerebral hypometabolism in patients with pharmacoresistant focal epilepsy as a complement to the visual analysis of the (18)F-FDG positron emission tomography (PET)/CT exam. METHODS: A total of 39 patients with pharmacoresistant epilepsy and probable focal cortical dysplasia [22 patients with frontal lobe epilepsy (FLE) and 17 with temporal lobe epilepsy (TLE)] underwent a presurgical evaluation including EEG, video-EEG, MRI, and (18)F-FDG PET/CT...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28918702/anterior-thalamic-nuclei-deep-brain-stimulation-reduces-disruption-of-the-blood-brain-barrier-albumin-extravasation-inflammation-and-apoptosis-in-kainic-acid-induced-epileptic-rats
#3
Ying-Chuan Chen, Guan-Yu Zhu, Xiu Wang, Lin Shi, Ting-Ting Du, De-Feng Liu, Yu-Ye Liu, Yin Jiang, Xin Zhang, Jian-Guo Zhang
Objective The therapeutic efficacy of anterior thalamic nuclei deep brain stimulation (ATN-DBS) against seizures has been largely accepted; however, the effects of ATN-DBS on disruption of the blood-brain barrier (BBB), albumin extravasation, inflammation and apoptosis still remain unclear. Methods Rats were distributed into four treatment groups: physiological saline (PS, N = 12), kainic acid (KA, N = 12), KA-sham-DBS (N = 12) and KA-DBS (N = 12). Seizures were monitored using video-electroencephalogram (EEG)...
September 18, 2017: Neurological Research
https://www.readbyqxmd.com/read/28918162/how-high-level-of-anxiety-in-panic-disorder-can-interfere-in-working-memory-a-computer-simulation-and-electrophysiological-investigation
#4
Luiza Wanick Di Giorgio Silva, Danielle Aprigio, Jesse Di Giacomo, Mariana Gongora, Henning Budde, Juliana Bittencourt, Mauricio Cagy, Silmar Teixeira, Pedro Ribeiro, Marcele Regine de Carvalho, Rafael Freire, Antonio Egidio Nardi, Luis Fernando Basile, Bruna Velasques
Panic disorder (PD) is characterized by repeated and unexpected attacks of intense anxiety, which are not restricted to a determined situation or circumstance. The coherence function has been used to investigate the communication among brain structures through the quantitative EEG (qEEG). The objective of this study is to analyze if there is a difference in frontoparietal gamma coherence (GC) between panic disorder patients (PDP) and healthy controls (HC) during the Visual oddball paradigm; and verify if high levels of anxiety (produced by a computer simulation) affect PDP's working memory...
September 11, 2017: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/28917501/personalized-translational-epilepsy-research-novel-approaches-and-future-perspectives-part-i-clinical-and-network-analysis-approaches
#5
REVIEW
Felix Rosenow, Natascha van Alphen, Albert Becker, Andreas Chiocchetti, Ralf Deichmann, Thomas Deller, Thomas Freiman, Christine M Freitag, Johannes Gehrig, Anke M Hermsen, Peter Jedlicka, Christian Kell, Karl Martin Klein, Susanne Knake, Dimitri M Kullmann, Stefan Liebner, Braxton A Norwood, Diana Omigie, Karlheinz Plate, Andreas Reif, Philipp S Reif, Yvonne Reiss, Jochen Roeper, Michael W Ronellenfitsch, Stephanie Schorge, Gerhard Schratt, Stephan W Schwarzacher, Joachim P Steinbach, Adam Strzelczyk, Jochen Triesch, Marlies Wagner, Matthew C Walker, Frederic von Wegner, Sebastian Bauer
Despite the availability of more than 15 new "antiepileptic drugs", the proportion of patients with pharmacoresistant epilepsy has remained constant at about 20-30%. Furthermore, no disease-modifying treatments shown to prevent the development of epilepsy following an initial precipitating brain injury or to reverse established epilepsy have been identified to date. This is likely in part due to the polyetiologic nature of epilepsy, which in turn requires personalized medicine approaches. Recent advances in imaging, pathology, genetics and epigenetics have led to new pathophysiological concepts and the identification of monogenic causes of epilepsy...
September 13, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28917498/personalized-translational-epilepsy-research-novel-approaches-and-future-perspectives-part-ii-experimental-and-translational-approaches
#6
REVIEW
Sebastian Bauer, Natascha van Alphen, Albert Becker, Andreas Chiocchetti, Ralf Deichmann, Thomas Deller, Thomas Freiman, Christine M Freitag, Johannes Gehrig, Anke M Hermsen, Peter Jedlicka, Christian Kell, Karl Martin Klein, Susanne Knake, Dimitri M Kullmann, Stefan Liebner, Braxton A Norwood, Diana Omigie, Karlheinz Plate, Andreas Reif, Philipp S Reif, Yvonne Reiss, Jochen Roeper, Michael W Ronellenfitsch, Stephanie Schorge, Gerhard Schratt, Stephan W Schwarzacher, Joachim P Steinbach, Adam Strzelczyk, Jochen Triesch, Marlies Wagner, Matthew C Walker, Frederic von Wegner, Felix Rosenow
Despite the availability of more than 15 new "antiepileptic drugs", the proportion of patients with pharmacoresistant epilepsy has remained constant at about 20-30%. Furthermore, no disease-modifying treatments shown to prevent the development of epilepsy following an initial precipitating brain injury or to reverse established epilepsy have been identified to date. This is likely in part due to the polyetiologic nature of epilepsy, which in turn requires personalized medicine approaches. Recent advances in imaging, pathology, genetics, and epigenetics have led to new pathophysiological concepts and the identification of monogenic causes of epilepsy...
September 13, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/28910297/evaluation-of-auditory-perception-development-in-neonates-by-quantitative-electroencephalography-and-auditory-event-related-potentials
#7
Qinfen Zhang, Qirui Cheng, Hongxin Li, Xuan Dong, Wenjuan Tu
OBJECTIVE: The present study was performed to investigate neonatal auditory perception function by quantitative electroencephalography (QEEG) and auditory event-related potentials (aERPs) and identify the characteristics of auditory perception development in newborns. METHODS: Fifty-three normal full-term neonates were divided into three groups according their age in days. An auditory oddball paradigm was used. QEEG (resting state and task state) and aERPs were performed...
2017: PloS One
https://www.readbyqxmd.com/read/28905146/long-range-temporal-correlations-reflect-treatment-response-in-the-electroencephalogram-of-patients-with-infantile-spasms
#8
Rachel J Smith, Amanda Sugijoto, Neggy Rismanchi, Shaun A Hussain, Daniel W Shrey, Beth A Lopour
Infantile spasms syndrome is an epileptic encephalopathy in which prompt diagnosis and treatment initiation are critical to therapeutic response. Diagnosis of the disease heavily depends on the identification of characteristic electroencephalographic (EEG) patterns, including hypsarrhythmia. However, visual assessment of the presence and characteristics of hypsarrhythmia is challenging because multiple variants of the pattern exist, leading to poor inter-rater reliability. We investigated whether a quantitative measurement of the control of neural synchrony in the EEGs of infantile spasms patients could be used to reliably distinguish the presence of hypsarrhythmia and indicate successful treatment outcomes...
September 13, 2017: Brain Topography
https://www.readbyqxmd.com/read/28902890/simultaneous-trimodal-pet-mr-eeg-imaging-do-eeg-caps-generate-artefacts-in-pet-images
#9
Ravichandran Rajkumar, Elena Rota Kops, Jörg Mauler, Lutz Tellmann, Christoph Lerche, Hans Herzog, N Jon Shah, Irene Neuner
Trimodal simultaneous acquisition of positron emission tomography (PET), magnetic resonance imaging (MRI), and electroencephalography (EEG) has become feasible due to the development of hybrid PET-MR scanners. To capture the temporal dynamics of neuronal activation on a millisecond-by-millisecond basis, an EEG system is appended to the quantitative high resolution PET-MR imaging modality already established in our institute. One of the major difficulties associated with the development of simultaneous trimodal acquisition is that the components traditionally used in each modality can cause interferences in its counterpart...
2017: PloS One
https://www.readbyqxmd.com/read/28902713/long-lasting-repetitive-transcranial-magnetic-stimulation-modulates-electroencephalography-oscillation-in-patients-with-disorders-of-consciousness
#10
Xiaoyu Xia, Yang Liu, Yang Bai, Ziyuan Liu, Yi Yang, Yongkun Guo, Ruxiang Xu, Xiaorong Gao, Xiaoli Li, Jianghong He
Repetitive transcranial magnetic stimulation (rTMS) has been applied for the treatment of patients with disorders of consciousness (DOC). Timely and accurate assessments of its modulation effects are very useful. This study evaluated rTMS modulation effects on electroencephalography (EEG) oscillation in patients with chronic DOC. Eighteen patients with a diagnosis of DOC lasting more than 3 months were recruited. All patients received one session of 10-Hz rTMS at the left dorsolateral prefrontal cortex and then 12 of them received consecutive rTMS treatment everyday for 20 consecutive days...
September 11, 2017: Neuroreport
https://www.readbyqxmd.com/read/28901011/persistent-aberrant-cortical-phase-amplitude-coupling-following-seizure-treatment-in-absence-epilepsy-models
#11
Atul Maheshwari, Abraham Akbar, Mai Wang, Rachel Marks, Katherine Yu, Suhyeorn Park, Brett L Foster, Jeffrey L Noebels
In childhood absence epilepsy, cortical seizures are brief and intermittent; however there are extended periods without behavioural or electrographic ictal events. This genetic disorder is associated with variable degrees of cognitive dysfunction, but no consistent functional biomarkers that might provide insight into interictal cortical function have been described. Previous work in monogenic mouse models of absence epilepsy have shown that the interictal EEG displays augmented beta/gamma power in homozygous stargazer (stg/stg) mice bearing a presynaptic AMPA receptor defect, but not homozygous tottering (tg/tg) mice with a P/Q type calcium channel mutation...
September 12, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28900188/decoding-finger-movement-in-humans-using-synergy-of-eeg-cortical-current-signals
#12
Natsue Yoshimura, Hayato Tsuda, Toshihiro Kawase, Hiroyuki Kambara, Yasuharu Koike
The synchronized activity of neuronal populations across multiple distant brain areas may reflect coordinated interactions of large-scale brain networks. Currently, there is no established method to investigate the temporal transitions between these large-scale networks that would allow, for example, to decode finger movements. Here we applied a matrix factorization method employing principal component and temporal independent component analyses to identify brain activity synchronizations. In accordance with previous studies investigating "muscle synergies", we refer to this activity as "brain activity synergy"...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28899742/icn_atlas-automated-description-and-quantification-of-functional-mri-activation-patterns-in-the-framework-of-intrinsic-connectivity-networks
#13
Lajos R Kozák, Louis André van Graan, Umair J Chaudhary, Ádám Szabó, Louis Lemieux
Generally, the interpretation of functional MRI (fMRI) activation maps continues to rely on assessing their relationship to anatomical structures, mostly in a qualitative and often subjective way. Recently, the existence of persistent and stable brain networks of functional nature has been revealed; in particular these so-called intrinsic connectivity networks (ICNs) appear to link patterns of resting state and task-related state connectivity. These networks provide an opportunity of functionally-derived description and interpretation of fMRI maps, that may be especially important in cases where the maps are predominantly task-unrelated, such as studies of spontaneous brain activity e...
September 9, 2017: NeuroImage
https://www.readbyqxmd.com/read/28871712/some-quantitative-eeg-features-in-default-mode-resting-state-network-under-general-anaesthesia
#14
Peter Jombík, Michal Drobny, Beata Saniova, Martin Fischer, Petra Kaderjaková, Marianna Lajčiaková, Erika Bakosova, Eva Drobna, Petr Bob, Vladimír Nosáľ
OBJECTIVES: The default mode resting state network (DMRSN) constitutes a circuit which is active in conditions when the subject is at rest. We tested the hypothesis that its function will be altered during unconsciousness. METHODS: Changes in the mean squared coherences in five conventional frequency bands (delta to gamma) in DMRSN during general anaesthesia (GA) were investigated in 39 patients. They were compared with the normal EEG of 86 alert subjects, severely abnormal EEG of 112 patients with dementia and/or encephalopathy, and the mathematical model of brain death...
August 5, 2017: Neuro Endocrinology Letters
https://www.readbyqxmd.com/read/28861032/mismatch-negativity-as-an-indicator-of-cognitive-sub-domain-dysfunction-in-amyotrophic-lateral-sclerosis
#15
Parameswaran Mahadeva Iyer, Kieran Mohr, Michael Broderick, Brighid Gavin, Tom Burke, Peter Bede, Marta Pinto-Grau, Niall P Pender, Russell McLaughlin, Alice Vajda, Mark Heverin, Edmund C Lalor, Orla Hardiman, Bahman Nasseroleslami
OBJECTIVE: To evaluate the utility of mismatch negativity (MMN), a neurophysiologic marker of non-motor cognitive processing, in amyotrophic lateral sclerosis (ALS). METHODS: 89 patients, stratified into 4 different phenotypic presentations of ALS (67 spinal-onset, 15 bulbar-onset, 7 ALS-FTD, 7 C9ORF72 gene careers), and 19 matched controls underwent 128-channel EEG data recording. Subjects were presented with standard auditory tones interleaved with pitch-deviant tones in three recording blocks...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28860987/apathy-in-patients-with-parkinson-s-disease-correlates-with-alteration-of-left-fronto-polar-electroencephalographic-connectivity
#16
Florian Hatz, Antonia Meyer, Ronan Zimmermann, Ute Gschwandtner, Peter Fuhr
Introduction: Quantitative electroencephalography (QEEG) brain frequency and network analyses are known to differentiate between disease stages in Parkinson's disease (PD) and are possible biomarkers. They correlate with cognitive decline. Little is known about changes in brain networks in relation to apathy. Objective/Aims: To analyze changes in brain network connectivities related to apathy. Methods: 40 PD patients (14 PD with mild cognitive deficits and 26 PD with normal cognition) were included. All patients had extensive neuropsychological testing; apathy was evaluated using the apathy evaluation score (AES, median 24...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28860979/childhood-trauma-associated-with-enhanced-high-frequency-band-powers-and-induced-subjective-inattention-of-adults
#17
Seung-Hwan Lee, Yeonsoo Park, Min Jin Jin, Yeon Jeong Lee, Sang Woo Hahn
Childhood trauma can lead to various psychological and cognitive symptoms. It has been demonstrated that high frequency electroencephalogram (EEG) powers could be closely correlated with inattention. In this study, we explored the relationship between high frequency EEG powers, inattention, symptoms of adult attention deficit hyperactivity disorder (ADHD), and childhood traumatic experiences. A total of 157 healthy Korean adult volunteers were included and divided into two groups using the Childhood Trauma Questionnaire (CTQ) score...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/28859124/effect-of-general-anesthesia-on-neonatal-aeeg-a-cohort-study-of-patients-with-non-cardiac-congenital-anomalies
#18
Lisanne J Stolwijk, Lauren C Weeke, Linda S de Vries, Maud Y A van Herwaarden, David C van der Zee, Desiree B M van der Werff, Manon J N L Benders, Mona Toet, Petra M A Lemmers
INTRODUCTION: The aim of the current study was to determine the effect of general anesthesia on neonatal brain activity using amplitude-integrated EEG (aEEG). METHODS: A prospective cohort study of neonates (January 2013-December 2015), who underwent major neonatal surgery for non-cardiac congenital anomalies. Anesthesia was administered at the discretion of the anesthetist. aEEG monitoring was started six hours preoperatively until 24 hours after surgery. Analysis of classes of aEEG background patterns, ranging from continuous normal voltage to flat trace in six classes, and quantitative EEG-measures, using spontaneous activity transients (SATs) and interSATintervals (ISI), was performed...
2017: PloS One
https://www.readbyqxmd.com/read/28858905/electroencephalogram-abnormalities-during-positional-changes-in-brain-sagging-syndrome
#19
Benziger Bensam, Heustein L Sy, Nadia Sotudeh, Paulomi K Bhalla, Sean T Hwang, David E LeDoux
PURPOSE: Brain sagging after craniotomy and clipping of a ruptured aneurysm is a rare complication. Clinical and electrographic changes in patients with a final diagnosis of intracranial hypotension are not well described, and can be mistaken on rare occasions for other entities such as nonconvulsive status epilepticus. There may be resulting delay in the diagnosis and treatment of this potentially life-threatening disorder. METHODS: Case report and imaging. RESULTS: We present a case of intracranial hypotension in which concerning continuous electroencephalogram (cEEG) and quantitative EEG (qEEG) findings were noted during active sagging of the brain, which resolved with supine positioning...
August 30, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28853229/average-spectral-power-changes-at-the-hippocampal-electroencephalogram-in-schizophrenia-model-induced-by-ketamine
#20
Luis Rafael L Sampaio, Lucas T N Borges, Joyse M F Silva, Francisca Roselin O de Andrade, Talita M Barbosa, Tatiane Q Oliveira, Danielle Macedo, Ricardo F Lima, Leonardo Pimentel Dantas, Manoel Cláudio Azevedo Patrocinio, Otoni C do Vale, Silvania Mendes M de Vasconcelos
The use of ketamine (Ket) as a pharmacological model of schizophrenia is an important tool for understanding the main mechanisms of glutamatergic regulated neural oscillations. Thus, the aim of the current study was to evaluate Ket induced changes in the average spectral power using the hippocampal quantitative electroencephalography (QEEG). To this end, male Wistar rats were submitted to a stereotactic surgery for the implantation of an electrode in the right hippocampus. After three days, the animals were divided into 4 groups that were treated for 10 consecutive days with Ket (10, 50 or 100 mg/kg)...
August 29, 2017: Fundamental & Clinical Pharmacology
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