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https://www.readbyqxmd.com/read/29331317/resting-state-quantitative-eeg-characteristics-of-insomniac-patients-with-depression
#1
Yunna Kwan, Chorom Baek, Sunhye Chung, Tae Hui Kim, Sungwon Choi
Insomnia is known to show hyperarousal in the central nervous system. However, depression that often coexists with insomnia exhibits hypo-activity in the frontal lobe, which is very different from insomnia. In the present study, we examined wake resting state EEG of insomniac patients with depression to investigate whether they could be conceptualized as spectrum of insomnia or significantly different from insomnia. We compared the absolute power values of EEG spectra of three groups: 15 insomniacs with comorbid depression (CD), age- and sex-matched 15 comorbid-free insomniacs (CFI), and 15 good sleep controls (GSC)...
January 10, 2018: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/29324406/a-novel-multi-class-eeg-based-sleep-stage-classification-system
#2
Pejman Memar, Farhad Faradji
Sleep stage classification is one of the most critical steps in effective diagnosis and the treatment of sleep-related disorders. Visual inspection undertaken by sleep experts is a time-consuming and burdensome task. A computer-assisted sleep stage classification system is thus essential for both sleep-related disorders diagnosis and sleep monitoring. In this paper, we propose a system to classify the wake and sleep stages with high rates of sensitivity and specificity. The EEG signals of 25 subjects with suspected sleep-disordered breathing, and the EEG signals of 20 healthy subjects from three data sets are used...
January 2018: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/29321683/dual-function-of-thalamic-low-vigilance-state-oscillations-rhythm-regulation-and-plasticity
#3
REVIEW
Vincenzo Crunelli, Magor L Lőrincz, William M Connelly, François David, Stuart W Hughes, Régis C Lambert, Nathalie Leresche, Adam C Errington
During inattentive wakefulness and non-rapid eye movement (NREM) sleep, the neocortex and thalamus cooperatively engage in rhythmic activities that are exquisitely reflected in the electroencephalogram as distinctive rhythms spanning a range of frequencies from <1 Hz slow waves to 13 Hz alpha waves. In the thalamus, these diverse activities emerge through the interaction of cell-intrinsic mechanisms and local and long-range synaptic inputs. One crucial feature, however, unifies thalamic oscillations of different frequencies: repetitive burst firing driven by voltage-dependent Ca2+ spikes...
January 11, 2018: Nature Reviews. Neuroscience
https://www.readbyqxmd.com/read/29304108/a-four-state-markov-model-of-sleep-wakefulness-dynamics-along-light-dark-cycle-in-mice
#4
Leonel Perez-Atencio, Nicolas Garcia-Aracil, Eduardo Fernandez, Luis C Barrio, Juan A Barios
Behavioral states alternate between wakefulness (wk), rapid eye movement (rem) and non-rem (nrem) sleep at time scale of hours i.e., light and dark cycle rhythms and from several tens of minutes to seconds (i.e., brief awakenings during sleep). Using statistical analysis of bout duration, Markov chains of sleep-wk dynamics and quantitative EEG analysis, we evaluated the influence of light/dark (ld) changes on brain function along the sleep-wk cycle. Bout duration (bd) histograms and Kaplan-Meier (km) survival curves of wk showed a bimodal statistical distribution, suggesting that two types of wk do exist: brief-wk (wkb) and long-wk (wkl)...
2018: PloS One
https://www.readbyqxmd.com/read/29273758/the-sleep-eeg-spectrum-is-a-sexually-dimorphic-marker-of-general-intelligence
#5
Péter P Ujma, Boris N Konrad, Ferenc Gombos, Péter Simor, Adrián Pótári, Lisa Genzel, Marcel Pawlowski, Axel Steiger, Róbert Bódizs, Martin Dresler
The shape of the EEG spectrum in sleep relies on genetic and anatomical factors and forms an individual "EEG fingerprint". Spectral components of EEG were shown to be connected to mental ability both in sleep and wakefulness. EEG sleep spindle correlates of intelligence, however, exhibit a sexual dimorphism, with a more pronounced association to intelligence in females than males. In a sample of 151 healthy individuals, we investigated how intelligence is related to spectral components of full-night sleep EEG, while controlling for the effects of age...
December 22, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29234278/effects-of-social-defeat-stress-on-sleep-in-mice
#6
Fiona Henderson, Vincent Vialou, Salah El Mestikawy, Véronique Fabre
Stress plays a key role in the development of psychiatric disorders and has a negative impact on sleep integrity. In mice, chronic social defeat stress (CSDS) is an ethologically valid model of stress-related disorders but little is known about its effects on sleep regulation. Here, we investigated the immediate and long-term effects of 10 consecutive days of social defeat (SD) on vigilance states in C57Bl/6J male mice. Social behavior was assessed to identify susceptible mice, i.e., mice that develop long-lasting social avoidance, and unsusceptible mice...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/29231181/automatic-two-channel-sleep-staging-using-a-predictor-corrector-method
#7
Shirin Riazy, Tilo Wendler, Juergen Pilz
We developed and implemented two predictor-corrector methods for the classification of two-channel EEG data into sleep stages. Approach: The sequence of sleep stages over the night is modeled by a Markov chain of first and second order, resulting in an informative prior distribution for the new state given the distribution of the current one. The correction step is realized by applying a Bayes classifier using the (preprocessed) data and this prior. The preprocessing step consists of a frequency analysis, a log transformation and a dimensionality reduction via principle component analysis...
December 12, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/29230640/new-class-of-reduced-computationally-efficient-neuronal-models-for-large-scale-simulations-of-brain-dynamics
#8
Maxim Komarov, Giri Krishnan, Sylvain Chauvette, Nikolai Rulkov, Igor Timofeev, Maxim Bazhenov
During slow-wave sleep, brain electrical activity is dominated by the slow (< 1 Hz) electroencephalogram (EEG) oscillations characterized by the periodic transitions between active (or Up) and silent (or Down) states in the membrane voltage of the cortical and thalamic neurons. Sleep slow oscillation is believed to play critical role in consolidation of recent memories. Past computational studies, based on the Hodgkin-Huxley type neuronal models, revealed possible intracellular and network mechanisms of the neuronal activity during sleep, however, they failed to explore the large-scale cortical network dynamics depending on collective behavior in the large populations of neurons...
December 12, 2017: Journal of Computational Neuroscience
https://www.readbyqxmd.com/read/29221784/assessment-of-intervention-related-changes-in-non-rapid-eye-movement-sleep-depth-importance-of-sleep-depth%C3%A2-changes-within-stage-2
#9
Sultan Qanash, Eleni Giannouli, Magdy Younes
OBJECTIVES: Depth of sleep within non-rapid-eye-movement (non-REM) stage-2 (N2-depth) varies from being nearly similar to stage-1 to nearly similar to stage-3. Differences in N2-depth are not captured by conventional indices of sleep depth (N1-N3 times, arousal/awakening index) when comparing sleep depth under different conditions. Magnitude of changes in N2-depth in the same individual under different experimental conditions, and the importance of measuring these changes are unknown...
December 2017: Sleep Medicine
https://www.readbyqxmd.com/read/29217404/high-density-eeg-characterization-of-brain-responses-to-auditory-rhythmic-stimuli-during-wakefulness-and-nrem-sleep
#10
Caroline Lustenberger, Yogi A Patel, Sankaraleengam Alagapan, Jessica M Page, Betsy Price, Michael R Boyle, Flavio Frohlich
Auditory rhythmic sensory stimulation modulates brain oscillations by increasing phase-locking to the temporal structure of the stimuli and by increasing the power of specific frequency bands, resulting in Auditory Steady State Responses (ASSR). The ASSR is altered in different diseases of the central nervous system such as schizophrenia. However, in order to use the ASSR as biological markers for disease states, it needs to be understood how different vigilance states and underlying brain activity affect the ASSR...
December 4, 2017: NeuroImage
https://www.readbyqxmd.com/read/29209389/asymmetrical-electroencephalographic-change-of-human-brain-during-sleep-onset-period
#11
Doo-Heum Park, Chul-Jin Shin
Objective: Human cerebral hemisphere is known to function asymmetrically with daytime left hemisphere superiority in most right-handed persons. It may have relevance to the localization of specific function of the brain. This study attempted to reveal whether the functional cerebral asymmetry in the wakeful state is still maintained throughout the sleep onset period. Methods: Thirty-channel EEG was recorded in 61 healthy subjects. The EEG power spectra of each of the seven frequencies were compared between the two kinds of 30-second states; the wakeful stage and the late-sleep stage 1...
November 2017: Psychiatry Investigation
https://www.readbyqxmd.com/read/29170000/sleep-disorder-and-altered-locomotor-activity-as-biomarkers-of-the-parkinson-s-disease-cholinopathy-in-rat
#12
Jelena Ciric, Katarina Lazic, Slobodan Kapor, Milka Perovic, Jelena Petrovic, Vesna Pesic, Selma Kanazir, Jasna Saponjic
In order to find out the possible earliest biomarkers of Parkinson's disease (PD) cholinopathy, we followed the impact of bilateral pedunculopontine tegmental nucleus (PPT) lesion in rat on: the cortical and hippocampal sleep/wake states architectures, all sleep states related EEG microstructures, sleep spindles, the basal and stimulated locomotor activity. Sleep and basal locomotor activity in adult Wistar rats were followed during their inactive circadian phase, and throughout the same aging period. The bilateral PPT lesions were done by 0...
November 20, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/29168010/modulation-of-thalamocortical-oscillations-by-trip8b-an-auxiliary-subunit-for-hcn-channels
#13
Mehrnoush Zobeiri, Rahul Chaudhary, Maia Datunashvili, Robert J Heuermann, Annika Lüttjohann, Venu Narayanan, Sabine Balfanz, Patrick Meuth, Dane M Chetkovich, Hans-Christian Pape, Arnd Baumann, Gilles van Luijtelaar, Thomas Budde
Hyperpolarization-activated cyclic nucleotide-gated cation (HCN) channels have important functions in controlling neuronal excitability and generating rhythmic oscillatory activity. The role of tetratricopeptide repeat-containing Rab8b-interacting protein (TRIP8b) in regulation of hyperpolarization-activated inward current, I h, in the thalamocortical system and its functional relevance for the physiological thalamocortical oscillations were investigated. A significant decrease in I h current density, in both thalamocortical relay (TC) and cortical pyramidal neurons was found in TRIP8b-deficient mice (TRIP8b(-/-))...
November 22, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/29161907/heightened-background-cortical-synchrony-in-patients-with-epilepsy-eeg-phase-synchrony-analysis-during-awake-and-sleep-stages-using-novel-ensemble-measure
#14
Chetan S Nayak, N Mariyappa, Kaushik K Majumdar, Pradeep D Prasad, G S Ravi, M Nagappa, Thennarasu Kandavel, Arun B Taly, Sanjib Sinha
INTRODUCTION: Excessive cortical synchrony within neural ensembles has been implicated as an important mechanism driving epileptiform activity. The current study measures and compares background electroencephalographic (EEG) phase synchronization in patients having various types of epilepsies and healthy controls during awake and sleep stages. METHODS: A total of 120 patients with epilepsy (PWE) subdivided into 3 groups (juvenile myoclonic epilepsy [JME], temporal lobe epilepsy [TLE], and extra-temporal lobe epilepsy [Ex-TLE]; n = 40 in each group) and 40 healthy controls were subjected to overnight polysomnography...
March 1, 2017: Clinical EEG and Neuroscience: Official Journal of the EEG and Clinical Neuroscience Society (ENCS)
https://www.readbyqxmd.com/read/29150679/dynamics-of-high-frequency-brain-activity
#15
Steven X Moffett, Sean M O'Malley, Shushuang Man, Dawei Hong, Joseph V Martin
Evidence suggests that electroencephalographic (EEG) activity extends far beyond the traditional frequency range. Much of the prior study of >120 Hz EEG is in epileptic brains. In the current work, we measured EEG activity in the range of 200 to 2000 Hz, in the brains of healthy, spontaneously behaving rats. Both arrhythmic (1/f-type) and rhythmic (band) activities were identified and their properties shown to depend on EEG-defined stage of sleep/wakefulness. The inverse power law exponent of 1/f-type noise is shown to decrease from 3...
November 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29142322/bilateral-5%C3%A2-hz-transcranial-alternating-current-stimulation-on-fronto-temporal-areas-modulates-resting-state-eeg
#16
Aurora D'Atri, Claudia Romano, Maurizio Gorgoni, Serena Scarpelli, Valentina Alfonsi, Michele Ferrara, Fabio Ferlazzo, Paolo Maria Rossini, Luigi De Gennaro
Rhythmic non-invasive brain stimulations are promising tools to modulate brain activity by entraining neural oscillations in specific cortical networks. The aim of the study was to assess the possibility to influence the neural circuits of the wake-sleep transition in awake subjects via a bilateral transcranial alternating current stimulation at 5 Hz (θ-tACS) on fronto-temporal areas. 25 healthy volunteers participated in two within-subject sessions (θ-tACS and sham), one week apart and in counterbalanced order...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29125946/a-stereo-eeg-study-in-a-patient-with-sleep-related-hypermotor-epilepsy-due-to-depdc5-mutation
#17
Lorenzo Ferri, Francesca Bisulli, Roberto Mai, Laura Licchetta, Chiara Leta, Lino Nobili, Barbara Mostacci, Tommaso Pippucci, Paolo Tinuper
PURPOSE: Dishevelled EGL-10 and pleckstrin domain-containing protein 5 (DEPDC5) mutations are found in a wide spectrum of focal epilepsies ranging from epilepsy caused by malformation of cortical development to non-lesional epilepsy, including sleep-related hypermotor epilepsy (SHE). A surgical approach has been anecdotally reported in patients with DEPDC5 mutations, but most of these cases had a lesional etiology. METHODS: We describe a stereo-EEG (SEEG) study in a patient with drug-resistant/non-lesional SHE...
November 4, 2017: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/29123082/supramammillary-glutamate-neurons-are-a-key-node-of-the-arousal-system
#18
Nigel P Pedersen, Loris Ferrari, Anne Venner, Joshua L Wang, Stephen B G Abbott, Nina Vujovic, Elda Arrigoni, Clifford B Saper, Patrick M Fuller
Basic and clinical observations suggest that the caudal hypothalamus comprises a key node of the ascending arousal system, but the cell types underlying this are not fully understood. Here we report that glutamate-releasing neurons of the supramammillary region (SuM(vglut2)) produce sustained behavioral and EEG arousal when chemogenetically activated. This effect is nearly abolished following selective genetic disruption of glutamate release from SuM(vglut2) neurons. Inhibition of SuM(vglut2) neurons decreases and fragments wake, also suppressing theta and gamma frequency EEG activity...
November 10, 2017: Nature Communications
https://www.readbyqxmd.com/read/29118106/sleep-in-humans-stabilizes-pattern-separation-performance
#19
A Hanert, F D Weber, A Pedersen, J Born, T Bartsch
Replay of hippocampal neural representations during sleep is thought to promote systems consolidation of declarative memory. How this reprocessing of memory during sleep affects the hippocampal representation itself, is unclear. Here we tested hippocampal stimulus processing, i.e., pattern separation, before and after periods of sleep and wakefulness in humans (female and male participants). Pattern separation deteriorated across the wake period but remained stable across sleep (p = .013) with this sleep-wake difference being most pronounced for stimuli with low similarity to targets (p = ...
November 8, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29106402/selective-neuronal-lapses-precede-human-cognitive-lapses-following-sleep-deprivation
#20
Yuval Nir, Thomas Andrillon, Amit Marmelshtein, Nanthia Suthana, Chiara Cirelli, Giulio Tononi, Itzhak Fried
Sleep deprivation is a major source of morbidity with widespread health effects, including increased risk of hypertension, diabetes, obesity, heart attack, and stroke. Moreover, sleep deprivation brings about vehicle accidents and medical errors and is therefore an urgent topic of investigation. During sleep deprivation, homeostatic and circadian processes interact to build up sleep pressure, which results in slow behavioral performance (cognitive lapses) typically attributed to attentional thalamic and frontoparietal circuits, but the underlying mechanisms remain unclear...
November 6, 2017: Nature Medicine
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