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Electroencephalogram

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https://www.readbyqxmd.com/read/28342407/music-and-natural-sounds-in-an-auditory-steady-state-response-based-brain-computer-interface-to-increase-user-acceptance
#1
Jeong Heo, Hyun Jae Baek, Seunghyeok Hong, Min Hye Chang, Jeong Su Lee, Kwang Suk Park
Patients with total locked-in syndrome are conscious; however, they cannot express themselves because most of their voluntary muscles are paralyzed, and many of these patients have lost their eyesight. To improve the quality of life of these patients, there is an increasing need for communication-supporting technologies that leverage the remaining senses of the patient along with physiological signals. The auditory steady-state response (ASSR) is an electro-physiologic response to auditory stimulation that is amplitude-modulated by a specific frequency...
March 18, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28337603/multimodal-outcome-prognostication-after-cardiac-arrest-and-targeted-temperature-management-analysis-at-36%C3%A2-%C3%A2-c
#2
Spyridoula Tsetsou, Jan Novy, Christian Pfeiffer, Mauro Oddo, Andrea O Rossetti
BACKGROUND: Targeted temperature management (TTM) represents the standard of care in comatose survivors after cardiac arrest (CA) and may be applied targeting 33° or 36 °C. While multimodal prognostication has been extensively tested for 33 °C, scarce information exists for 36 °C. METHODS: In this cohort study, consecutive comatose adults after CA treated with TTM at 36 °C between July 2014 and October 2016 were included. A combination of neurological examination, electrophysiological features, and serum neuron-specific enolase (NSE) was evaluated for outcome prediction at 3 months (mortality; good outcome defined as cerebral performance categories (CPC) score of 1-2, poor outcome defined as CPC 3-5)...
March 23, 2017: Neurocritical Care
https://www.readbyqxmd.com/read/28334998/spatiotemporal-mapping-of-epileptic-spikes-using-simultaneous-eeg-functional-mri
#3
Jennifer M Walz, Mangor Pedersen, Amir Omidvarnia, Mira Semmelroch, Graeme D Jackson
Epileptic spikes occur on the sub-second timescale and are known to involve not only epileptic foci but also large-scale distributed brain networks. There is likely to be a sequence of neural activity in multiple brain regions that occurs within the duration of a single spike, but standard electroencephalography-functional magnetic resonance imaging analyses, which use only the timing of the spikes to model the functional magnetic resonance imaging data, cannot determine the sequence of these activations. Our aim in this study is to temporally resolve these spatial activations to observe the spatiotemporal dynamics of the spike-related neural activity at a sub-second timescale...
February 20, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28334879/altered-sleep-homeostasis-correlates-with-cognitive-impairment-in-patients-with-focal-epilepsy
#4
Melanie Boly, Benjamin Jones, Graham Findlay, Erin Plumley, Armand Mensen, Bruce Hermann, Guilio Tononi, Rama Maganti
In animal studies, both seizures and interictal spikes induce synaptic potentiation. Recent evidence suggests that electroencephalogram slow wave activity during sleep reflects synaptic potentiation during wake, and that its homeostatic decrease during the night is associated with synaptic renormalization and its beneficial effects. Here we asked whether epileptic activity induces plastic changes that can be revealed by high-density electroencephalography recordings during sleep in 15 patients with focal epilepsy and 15 control subjects...
March 14, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28334352/the-human-neural-alpha-response-to-speech-is-a-proxy-of-attentional-control
#5
Malte Wöstmann, Sung-Joo Lim, Jonas Obleser
Human alpha (~10 Hz) oscillatory power is a prominent neural marker of cognitive effort. When listeners attempt to process and retain acoustically degraded speech, alpha power enhances. It is unclear whether these alpha modulations reflect the degree of acoustic degradation per se or the degradation-driven demand to a listener's attentional control. Using an irrelevant-speech paradigm and measuring the electroencephalogram (EEG), the current experiment demonstrates that the neural alpha response to speech is a surprisingly clear proxy of top-down control, entirely driven by the listening goals of attending versus ignoring degraded speech...
March 18, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28332250/visual-hallucinations-in-patients-with-acute-stroke-a-prospective-exploratory-study
#6
E Morenas-Rodríguez, P Camps-Renom, A Pérez-Cordón, A Horta-Barba, M Simón-Talero, E Cortés-Vicente, D Guisado-Alonso, E Vilaplana, C García-Sánchez, A Gironell, C Roig, R Delgado-Mederos, J Martí-Fàbregas
BACKGROUND AND PURPOSE: The incidence, underlying physiopathology, features and association with lesion topography of visual hallucinations in acute stroke have scarcely been investigated. METHODS: Patients with a diagnosis of acute stroke (ischaemic or haemorrhagic) in any vascular territory, admitted within 24 h after the onset of symptoms, were consecutively included in the study. Patients with a previous history of psychosis or cognitive impairment were excluded...
March 22, 2017: European Journal of Neurology: the Official Journal of the European Federation of Neurological Societies
https://www.readbyqxmd.com/read/28328980/early-biomarkers-of-brain-injury-and-cerebral-hypo-and-hyperoxia-in-the-safeboosc-ii-trial
#7
Anne M Plomgaard, Thomas Alderliesten, Topun Austin, Frank van Bel, Manon Benders, Olivier Claris, Eugene Dempsey, Monica Fumagalli, Christian Gluud, Cornelia Hagmann, Simon Hyttel-Sorensen, Petra Lemmers, Wim van Oeveren, Adelina Pellicer, Tue H Petersen, Gerhard Pichler, Per Winkel, Gorm Greisen
BACKGROUND: The randomized clinical trial, SafeBoosC II, examined the effect of monitoring of cerebral oxygenation by near-infrared spectroscopy combined with a guideline on treatment when cerebral oxygenation was out of the target range. Data on cerebral oxygenation was collected in both the intervention and the control group. The primary outcome was the reduction in the burden of cerebral hypo- and hyperoxia between the two groups. In this study we describe the associations between the burden of cerebral hypo- and hyperoxia, regardless of allocation to intervention or control group, and the biomarkers of brain injury from birth till term equivalent age that was collected as secondary and explorative outcomes in the SafeBoosC II trial...
2017: PloS One
https://www.readbyqxmd.com/read/28326645/local-changes-in-the-wake-electroencephalogram-precedes-lane-departures
#8
Christer Ahlstrom, Sabina Jansson, Anna Anund
The objective of this exploratory study is to investigate if lane departures are associated with local sleep, measured via source-localized electroencephalography (EEG) theta power in the 5-9 Hz frequency range. Thirty participants drove in an advanced driving simulator, resulting in 135 lane departures at high levels of self-reported sleepiness. These lane departures were compared to matching non-departures at the same sleepiness level within the same individual. There was no correspondence between lane departures and global theta activity...
March 22, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28326118/spectral-analysis-of-polysomnography-in-narcolepsy
#9
Seok Ho Yun, Ho Dong Choi, Wan Seok Seo
OBJECTIVE: This study was conducted to identify differences between people with narcolepsy and the normal control of delta and theta activity using electroencephalogram (EEG) spectrum analysis of nocturnal polysomnography (PSG). METHODS: Seven narcolepsy patients and seven age-sex matched normal controls underwent PSG and multiple sleep latency tests. Participants' non-rapid eye movement (NREM) sleep EEGs in PSG was analyzed using a Fast Fourier Transform technique...
March 2017: Psychiatry Investigation
https://www.readbyqxmd.com/read/28325878/perceptual-integration-without-conscious-access
#10
Johannes J Fahrenfort, Jonathan van Leeuwen, Christian N L Olivers, Hinze Hogendoorn
The visual system has the remarkable ability to integrate fragmentary visual input into a perceptually organized collection of surfaces and objects, a process we refer to as perceptual integration. Despite a long tradition of perception research, it is not known whether access to consciousness is required to complete perceptual integration. To investigate this question, we manipulated access to consciousness using the attentional blink. We show that, behaviorally, the attentional blink impairs conscious decisions about the presence of integrated surface structure from fragmented input...
March 21, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28325011/research-on-eeg-features-of-attended-unattended-vigilance
#11
Chang Sun, Runge Chen, Miao Tian, Xingwei An, Hongzhi Qi, Minpeng Xu, Xuemin Wang, Dong Ming, Peng Zhou
Vigilance refers to the brain alertness to objective things, including the concentration of attention and the capability to response emergencies. It is of great importance to study vigilance monitoring to avoid accidents caused by decrease of vigilance. In this study, traditional Mackworth Clock Test (MCT) was modified to induce decline of attended and unattended vigilance. We analyzed EEG features in different levels of attended vigilance and assessed unattended vigilance by amplitude of mismatch negative (MMN) which can be evoked by audio odd ball stimulations...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28325008/feasibility-of-an-ultra-low-power-digital-signal-processor-platform-as-a-basis-for-a-fully-implantable-brain-computer-interface-system
#12
Po T Wang, Keulanna Gandasetiawan, Colin M McCrimmon, Alireza Karimi-Bidhendi, Charles Y Liu, Payam Heydari, Zoran Nenadic, An H Do
A fully implantable brain-computer interface (BCI) can be a practical tool to restore independence to those affected by spinal cord injury. We envision that such a BCI system will invasively acquire brain signals (e.g. electrocorticogram) and translate them into control commands for external prostheses. The feasibility of such a system was tested by implementing its benchtop analogue, centered around a commercial, ultra-low power (ULP) digital signal processor (DSP, TMS320C5517, Texas Instruments). A suite of signal processing and BCI algorithms, including (de)multiplexing, Fast Fourier Transform, power spectral density, principal component analysis, linear discriminant analysis, Bayes rule, and finite state machine was implemented and tested in the DSP...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324998/prediction-of-the-outcome-in-cardiac-arrest-patients-undergoing-hypothermia-using-eeg-wavelet-entropy
#13
Hana Moshirvaziri, Nima Ramezan-Arab, Shadnaz Asgari
Cardiac arrest (CA) is the leading cause of death in the United States. Induction of hypothermia has been found to improve the functional recovery of CA patients after resuscitation. However, there is no clear guideline for the clinicians yet to determine the prognosis of the CA when patients are treated with hypothermia. The present work aimed at the development of a prognostic marker for the CA patients undergoing hypothermia. A quantitative measure of the complexity of Electroencephalogram (EEG) signals, called wavelet sub-band entropy, was employed to predict the patients' outcomes...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28324995/eeg-based-mental-fatigue-detection-by-spectral-non-negative-matrix-factorization
#14
Lili Li, Guanghua Xu, Jun Xie, Min Li, Sicong Zhang, Ailing Luo
After long time cognitive work, most of people confronted with the mental fatigue, which can decrease the classification accuracy of cognitive, or even cause the traffic accidents for drivers. Therefore, the detection of the fatigue state is very essential. The study aims to explore an effective and novel approach based on electroencephalogram. All participants were instructed to implement the spelling experiments. Data were recorded on the awake condition, on sleep deprivation condition and after two hour spelling experiment...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28323852/extraction-of-features-from-sleep-eeg-for-bayesian-assessment-of-brain-development
#15
Vitaly Schetinin, Livija Jakaite
Brain development can be evaluated by experts analysing age-related patterns in sleep electroencephalograms (EEG). Natural variations in the patterns, noise, and artefacts affect the evaluation accuracy as well as experts' agreement. The knowledge of predictive posterior distribution allows experts to estimate confidence intervals within which decisions are distributed. Bayesian approach to probabilistic inference has provided accurate estimates of intervals of interest. In this paper we propose a new feature extraction technique for Bayesian assessment and estimation of predictive distribution in a case of newborn brain development assessment...
2017: PloS One
https://www.readbyqxmd.com/read/28323659/stimulus-induced-rhythmic-periodic-or-ictal-discharges-in-coma-incidence-and-interrater-reliability-of-continuous-eeg-after-a-standard-stimulation-protocol-a-prospective-study
#16
Khalid A Alsherbini, Joao Mc-OʼNeil Plancher, David M Ficker, Brandon P Foreman, Opeolu M Adeoye, Jun Ying, Michael D Privitera
PURPOSE: Stimulus-induced rhythmic, periodic, or ictal discharges (SIRPIDs) are often seen during continuous electroencephalographic (cEEG) monitoring in coma. Given their uncertain clinical significance, our prospective study evaluated incidence of SIRPIDs in comatose patients in the neuroscience intensive care unit (NSICU) who underwent a standard stimulation protocol and defined interreader reliability for cEEG. METHODS: Of 146 patients prospectively screened who underwent cEEG during a 6-month period, 53 patients were included and 93 patients were excluded...
March 17, 2017: Journal of Clinical Neurophysiology: Official Publication of the American Electroencephalographic Society
https://www.readbyqxmd.com/read/28320152/electrographic-patterns-in-patients-with-posterior-reversible-encephalopathy-syndrome-and-seizures
#17
Carlos Kamiya-Matsuoka, Sudhakar Tummala
INTRODUCTION: Posterior reversible encephalopathy syndrome (PRES) is a neurotoxic encephalopathic state associated with reversible cerebral vasogenic edema. Seizures are a common clinical presentation in PRES, however its electroencephalographic and radiologic pattern correlation is limited in this subset of patients. The aim of this study is to analyze the origin of electrographic dysfunction according to the radiologic pattern in patients with PRES and seizures. METHODS: We retrospectively identified 46 cancer patients who developed PRES and seizures at The University of Texas MD Anderson Cancer Center between January 2006 and June 2012...
April 15, 2017: Journal of the Neurological Sciences
https://www.readbyqxmd.com/read/28319876/redefining-periodic-patterns-on-electroencephalograms-of-patients-with-sporadic-creutzfeldt-jakob-disease
#18
Jung-Won Shin, Byeongsoo Yim, Seung Hun Oh, Nam Keun Kim, Sang Kun Lee, Ok-Joon Kim
OBJECTIVE: We aimed to redefine various periodic patterns (PPs) observed on electroencephalography (EEG) in patients with sporadic Creutzfeldt-Jakob disease (sCJD) using the American Clinical Neurophysiology Society's (ACNS) Criteria. METHODS: We analyzed EEG data of 23 patients with sCJD were admitted to two university hospitals between August 2005 and September 2015. RESULTS: We classified PPs on EEG data into three types: irregular periodic discharges (PDs) with superimposed rhythmic activities, appearing at a median of 8weeks after onset (w...
February 5, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28318282/altered-resting-state-eeg-complexity-in-children-with-tourette-syndrome-a-preliminary-study
#19
Wen-Chin Weng, Chi-Feng Chang, Lee Chin Wong, Jui-Hsiang Lin, Wang-Tso Lee, Jiann-Shing Shieh
OBJECTIVE: Tourette syndrome is a developmental neuropsychiatric disorder in children, and abnormal corticobasal ganglion connectivity is implied for the pathophysiology. Multiscale entropy, an entropy-based method to measure dynamic complexity at multiple temporal scales, is helpful to disclose the information of brain connectivity. This preliminary study investigated the complexity of resting-state electroencephalogram signals using multiscale entropy in children with Tourette syndrome...
March 20, 2017: Neuropsychology
https://www.readbyqxmd.com/read/28318068/helicid-alleviates-pain-and-sleep-disturbances-in-a-neuropathic-pain-like-model-in-mice
#20
Meng-Qi Zhang, Tian-Xiao Wang, Rui Li, Zhi-Li Huang, Wu-Jian Han, Xiao-Chang Dai, Yi-Qun Wang
Natural helicid (4-formylphenyl-O-β-d-allopyranoside), a main active constituent from seeds of the Chinese herb Helicia nilagirica, has been reported to exert a sedative, analgesic and hypnotic effect, and is used clinically to treat neurasthenic syndrome, vascular headaches and trigeminal neuralgia. In the current study, mechanical allodynia tests, electroencephalograms, electromyogram recordings and c-Fos expression in neuropathic pain-like model mice of partial sciatic nerve ligation were used to investigate the effect of helicid on neuropathic pain and co-morbid insomnia...
March 20, 2017: Journal of Sleep Research
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