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https://www.readbyqxmd.com/read/29933272/electroencephalographic-arousal-patterns-under-dexmedetomidine-sedation
#1
Jamie W Sleigh, Susana Vacas, Alana M Flexman, Pekka O Talke
BACKGROUND: The depth of dexmedetomidine-induced sedation is difficult to assess without arousing the patient. We evaluated frontal electroencephalogram (EEG) as an objective measure of dexmedetomidine-induced sedation. Our aims were to characterize the response patterns of EEG during a wide range of dexmedetomidine-induced sedation and to determine which spectral power best correlated with assessed levels of dexmedetomidine-induced sedation. METHODS: Sedline EEG sensor was positioned on the forehead of 16 volunteers...
June 20, 2018: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/29932428/impact-of-type-of-intracranial-eeg-sensors-on-link-strengths-of-evolving-functional-brain-networks
#2
Ancor Sanz-Garcia, Thorsten Rings, Klaus Lehnertz
Objective and Approach: Investigating properties of evolving functional brain networks has become a valuable tool to characterize the complex dynamics of the epileptic brain. 
 Such networks are usually derived from electroencephalograms (EEG) recorded with sensors implanted chronically into deeper structures of the brain and/or placed onto the cortex.
 It is still unclear, however, whether the use of different sensors for an identification of network nodes affects properties
 of functional brain networks...
June 22, 2018: Physiological Measurement
https://www.readbyqxmd.com/read/29932424/eegnet-a-compact-convolutional-neural-network-for-eeg-based-brain-computer-interfaces
#3
Vernon Lawhern, Amelia Solon, Nicholas Waytowich, Stephen M Gordon, Chou Hung, Brent J Lance
OBJECTIVE: Brain computer interfaces (BCI) enable direct communication with a computer, using neural activity as the control signal. This neural signal is generally chosen from a variety of well-studied electroencephalogram (EEG) signals. For a given BCI paradigm, feature extractors and classifiers are tailored to the distinct characteristics of its expected EEG control signal, limiting its application to that specific signal. Convolutional Neural Networks (CNNs), which have been used in computer vision and speech recognition to perform automatic feature extraction and classification, have successfully been applied to EEG-based BCIs; however, they have mainly been applied to single BCI paradigms and thus it remains unclear how these architectures generalize to other paradigms...
June 22, 2018: Journal of Neural Engineering
https://www.readbyqxmd.com/read/29931746/neurological-and-psychological-changes-in-hemodialysis-patients-before-and-after-the-treatment
#4
Silvia Lai, Alessio Molfino, Oriano Mecarelli, Patrizia Pulitano, Santo Morabito, Valentina Pistolesi, Roberto Romanello, Alessia Zarabla, Alessandro Galani, Nicla Frassetti, Paola Aceto, Carlo Lai
Neurological, psychological, and cognitive disorders in chronic kidney disease may contribute to poor quality of life in these patients. The aim of this study was to assess the electroencephalographic, psychological, and cognitive changes before and after hemodialysis (HD) compared with healthy controls (HC). Sixteen HD patients and 15 HC were enrolled. Electroencephalogram (EEG), Minnesota multiphasic personality inventory (MMPI-2) Satisfaction profile (SAT-P), and Neuropsychological test Global z-scores (NPZ5) were performed before (T0) and after (T1) HD treatment and in HC...
June 22, 2018: Therapeutic Apheresis and Dialysis
https://www.readbyqxmd.com/read/29929930/lexico-syntactic-features-are-activated-but-not-selected-in-bare-noun-production-electrophysiological-evidence-from-overt-picture-naming
#5
Man Wang, Yiya Chen, Niels O Schiller
To produce a word, speakers need to retrieve the lexico-syntactic representation of the word and encode the phonological form for articulation. It is not precisely known yet if a word's syntactic features (e.g., number, gender, etc.) are automatically activated and selected in bare noun production. Cubelli, Lotto, Paolieri, Girelli, and Job (2005) proposed that only in languages that have a complex morphological structure (e.g., Italian), the selection of grammatical gender is required. In languages with a relatively simpler morphological structure, the selection of grammatical gender is by-passed...
May 31, 2018: Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
https://www.readbyqxmd.com/read/29929395/the-longitudinal-effects-of-electroconvulsive-therapy-on-ictal-interhemispheric-coherence-and-its-associations-with-treatment-outcome-a-naturalistic-cohort-study
#6
Freek Ten Doesschate, Guido A van Wingen, Boudewijn J H B de Pont, Martijn Arns, Jeroen A van Waarde
OBJECTIVES: Electroconvulsive therapy (ECT) is an effective treatment for severe depression. Electroencephalogram (EEG) measures between ECT sessions seem to be related to the antidepressant efficacy of ECT. In this naturalistic cohort study, we examine longitudinal effects of ECT on interhemispheric EEG coherence measures during seizure activity and its relation to the antidepressant efficacy. METHODS: This study included 65 patients diagnosed with severe depressive disorder...
June 1, 2018: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29928633/evaluation-of-electroencephalogram-signals-of-the-professional-pianists-during-iconic-memory-and-working-memory-tests-using-spectral-coherence
#7
Seyedeh Yasamin Boutorabi, Ali Sheikhani
Background: Today, the neuroscience has growth in many aspects, and the effects of different factors on memory obtained many achievements. Several scientific and experimental studies evaluated effects of music on style and behavior of people; in this study, we evaluated memory between two groups of people, the professional pianists and normal people, through processing their electroencephalogram (EEG) signals using the coherence measure. Methods: In this study, EEG signals from 17 subjects during two memory tasks were recorded...
April 2018: Journal of Medical Signals and Sensors
https://www.readbyqxmd.com/read/29928593/diminished-hedonic-response-in-neuroleptic-free-youth-at-ultra-high-risk-for-psychosis
#8
Gregory P Strauss, Ivan Ruiz, Katherine H Visser, Laura P Crespo, Elizabeth K Dickinson
Hedonic response is preserved in schizophrenia. However, it is unclear whether this is also true in individuals meeting criteria for "prodromal" psychosis, who are considered to be at symptomatic high risk for developing the disorder. In this study, we examined neurophysiological and self-reported response to emotional stimuli in UHR ( n  = 23) and healthy control (CN: n  = 30) participants who passively viewed pleasant, unpleasant, and neutral images for 500 ms while the electroencephalogram was recorded and then provided self-reports of valence and arousal to the stimuli...
June 2018: Schizophrenia Research. Cognition
https://www.readbyqxmd.com/read/29928219/acute-opioid-induced-myoclonic-reaction-after-use-of-fentanyl-as-an-anesthetic-drug-for-an-emergency-cesarean-section
#9
Dana Khaled Almedallah, Dana Yousef Alshamlan, Erum Mubbashir Shariff
Myoclonus is an abnormal involuntary movement that has been previously reported with administration of high doses of opioids for prolonged periods of time. In this case, however, we report an acute myoclonic reaction and review the literature on the possible causative pathophysiology. We report the case of a 24-year-old woman who was admitted for postdated cesarean section. She started to have abnormal involuntary movements after administration of an epidural anesthesia containing 700 μg of fentanyl with 115 mL (0...
May 2018: Case Reports in Neurology
https://www.readbyqxmd.com/read/29928121/electroencephalogram-alpha-asymmetry-in-patients-with-depressive-disorders-current-perspectives
#10
REVIEW
Andreas Kurt Kaiser, Maria-Theresa Gnjezda, Stephanie Knasmüller, Wolfgang Aichhorn
Purpose: Electroencephalogram (EEG) alpha asymmetry (AA) in depressive disorders has been of interest over the last few decades, but it continues to remain unclear whether EEG AA can discriminate between healthy and depressive individuals. Materials and methods: A systematic literature search for papers addressing EEG AA using the keywords alpha asymmetry, depression, and EEG was performed in PubMed. All studies were checked for sample size, gender, handedness, reference, recording protocol, EEG band range, impedance, type of analysis, drugs, and comorbidity...
2018: Neuropsychiatric Disease and Treatment
https://www.readbyqxmd.com/read/29923808/beyond-epilepsy-how-can-quantitative-electroencephalography-improve-conventional-electroencephalography-findings-a-systematic-review-of-comparative-eeg-studies
#11
Cassio Henrique Taques Martins, Catarina De Marchi Assunção
It is a fundamental element in both research and clinical applications of electroencephalography to know the frequency composition of brain electrical activity. The quantitative analysis of brain electrical activity uses computer resources to evaluate the electroencephalography and allows quantification of the data. The contribution of the quantitative perspective is unique, since conventional electroencephalography based on the visual examination of the tracing is not as objective. A systematic review was performed on the MEDLINE database in October 2017...
2018: Neurodiagnostic Journal
https://www.readbyqxmd.com/read/29923552/understanding-perception-of-active-noise-control-system-through-multichannel-eeg-analysis
#12
Sangeeta Bagha, R K Tripathy, Pranati Nanda, C Preetam, Debi Prasad Das
In this Letter, a method is proposed to investigate the effect of noise with and without active noise control (ANC) on multichannel electroencephalogram (EEG) signal. The multichannel EEG signal is recorded during different listening conditions such as silent, music, noise, ANC with background noise and ANC with both background noise and music. The multiscale analysis of EEG signal of each channel is performed using the discrete wavelet transform. The multivariate multiscale matrices are formulated based on the sub-band signals of each EEG channel...
June 2018: Healthcare Technology Letters
https://www.readbyqxmd.com/read/29922477/using-brain-connectivity-metrics-from-synchrostates-to-perform-motor-imagery-classification-in-eeg-based-bci-systems
#13
Lorena Santamaria, Christopher James
Phase synchronisation between different neural groups is considered an important source of information to understand the underlying mechanisms of brain cognition. This Letter investigated phase-synchronisation patterns from electroencephalogram (EEG) signals recorded from ten healthy participants performing motor imagery (MI) tasks using schematic emotional faces as stimuli. These phase-synchronised states, named synchrostates, are specific for each cognitive task performed by the user. The maximum and minimum number of occurrence states were selected for each subject and task to extract the connectivity network measures based on graph theory to feed a set of classification algorithms...
June 2018: Healthcare Technology Letters
https://www.readbyqxmd.com/read/29921417/impaired-midline-theta-power-and-connectivity-during-proactive-cognitive-control-in-schizophrenia
#14
Sephira G Ryman, James F Cavanagh, Christopher J Wertz, Nicholas A Shaff, Andrew B Dodd, Brigitte Stevens, Josef Ling, Ronald A Yeo, Faith M Hanlon, Juan Bustillo, Shannon F Stromberg, Denise S Lin, Swala Abrams, Andrew R Mayer
BACKGROUND: Disrupted proactive cognitive control, a form of early selection and active goal maintenance, is hypothesized to underlie the broad cognitive deficits observed in patients with schizophrenia (SPs). Current research suggests that the disrupted activation within and connectivity between regions of the cognitive control network contribute to disrupted proactive cognitive control; however, no study has examined these mechanisms using an AX Continuous Performance Test task in schizophrenia...
May 25, 2018: Biological Psychiatry
https://www.readbyqxmd.com/read/29920532/different-effects-of-propofol-and-dexmedetomidine-sedation-on-electroencephalogram-patterns-wakefulness-moderate-sedation-deep-sedation-and-recovery
#15
Chunhua Xi, Shiyue Sun, Chuxiong Pan, Fang Ji, Xu Cui, Tianzuo Li
Sedation induces changes in electroencephalography (EEG) dynamics. However, the distinct EEG dynamic characteristics at comparable sedation levels have not been well studied, resulting in potential interpretation errors in EEG monitoring during sedation. We aimed to analyze the EEG dynamics of dexmedetomidine and propofol at comparable sedation levels and to explore EEG changes with increased sedation levels for each agent. We measured the Bispectral Index (BIS) and 20-channel EEG under dexmedetomidine and propofol sedation from wakefulness, moderate sedation, and deep sedation to recovery in healthy volunteers (n = 10) in a randomized, 2-day, crossover study...
2018: PloS One
https://www.readbyqxmd.com/read/29920435/aging-of-human-alpha-rhythm
#16
Maria G Knyazeva, Elham Barzegaran, Vladimir Y Vildavski, Jean-François Demonet
Alpha rhythm (AR) changes are the most pronounced electroencephalogram phenomenon in the aging brain. We analyzed them based on the inherent AR structure obtained by parallel factor analysis decomposition in the cortical source space. AR showed a stable multicomponent structure in 78% of sixty 20- to 81-year-old healthy adults. Typically, it consists of 2 components. The distribution of the higher frequency occipito-parietal component widens with age, with its maximum moving from BA18/19 to BA37. The low-frequency component originating from the occipito-temporal regions in young adults also moves anteriorly with age, while maintaining its maximum within BA37...
May 22, 2018: Neurobiology of Aging
https://www.readbyqxmd.com/read/29913339/incidence-of-epileptiform-discharges-in-children-during-induction-of-anaesthesia-using-propofol-versus-sevoflurane
#17
Susanne Koch, Leopold Rupp, Christine Prager, Rudolf Mörgeli, Sylvia Kramer, Klaus Dieter Wernecke, Astrid Fahlenkamp, Claudia Spies
OBJECTIVE: In pediatric patients, anaesthesia induction is often performed with intravenous Propofol or Sevoflurane inhalation. Although epileptiform discharges have been observed during inductions with Sevoflurane, their occurrence has not been investigated for i.v. Propofol inductions. The aim of this study is to compare the incidence of epileptiform discharges in children during anaesthesia induction using Propofol versus Sevoflurane. METHODS: Prospective, observational cohort study in children aged 0...
June 8, 2018: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29913283/tuning-functions-for-automatic-detection-of-brief-changes-of-facial-expression-in-the-human-brain
#18
Arnaud Leleu, Milena Dzhelyova, Bruno Rossion, Renaud Brochard, Karine Durand, Benoist Schaal, Jean-Yves Baudouin
Efficient decoding of even brief and slight intensity facial expression changes is important for social interactions. However, robust evidence for the human brain ability to automatically detect brief and subtle changes of facial expression remains limited. Here we built on a recently developed paradigm in human electrophysiology with full-blown expressions (Dzhelyova et al., 2017), to isolate and quantify a neural marker for the detection of brief and subtle changes of facial expression. Scalp electroencephalogram (EEG) was recorded from 18 participants during stimulation of a neutral face changing randomly in size at a rapid rate of 6 Hz...
June 16, 2018: NeuroImage
https://www.readbyqxmd.com/read/29912847/the-neural-correlation-of-sustained-attention-in-performing-conjunctive-continuous-performance-task-an-event-related-potential-study
#19
Amin Behzadnia, Farnaz Ghassemi, Soghra A Chermahini, Zahra Tabanfar, Athena Taymourtash
Owing to great improvements in cognitive neuroscience, the study of brain functions during different types of cognitive tasks has attracted much attention. Recording event-related potentials (ERPs) is an appropriate tool for such a purpose, as it is noninvasive and affordable. Attention is among the most studied cognitive processes. In this study, a visual version of the conjunctive continuous performance task-visual was used to examine the differences of cognitive processes in target and nontarget stimuli...
June 16, 2018: Neuroreport
https://www.readbyqxmd.com/read/29912008/processed-electroencephalogram-monitoring-and-postoperative-delirium-a-systematic-review-and-meta-analysis
#20
Kristen K MacKenzie, Angelitta M Britt-Spells, Laura P Sands, Jacqueline M Leung
BACKGROUND: Postoperative delirium complicates approximately 15 to 20% of major operations in patients at least 65 yr old and is associated with adverse outcomes and increased resource utilization. Furthermore, patients with postoperative delirium might also be at risk of developing long-term postoperative cognitive dysfunction. One potentially modifiable variable is use of intraoperative processed electroencephalogram to guide anesthesia. This systematic review and meta-analysis examines the relationship between processed electroencephalogram monitoring and postoperative delirium and cognitive dysfunction...
June 15, 2018: Anesthesiology
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