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Sleep Spindles

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https://www.readbyqxmd.com/read/28337134/acoustic-enhancement-of-sleep-slow-oscillations-and-concomitant-memory-improvement-in-older-adults
#1
Nelly A Papalambros, Giovanni Santostasi, Roneil G Malkani, Rosemary Braun, Sandra Weintraub, Ken A Paller, Phyllis C Zee
Acoustic stimulation methods applied during sleep in young adults can increase slow wave activity (SWA) and improve sleep-dependent memory retention. It is unknown whether this approach enhances SWA and memory in older adults, who generally have reduced SWA compared to younger adults. Additionally, older adults are at risk for age-related cognitive impairment and therefore may benefit from non-invasive interventions. The aim of this study was to determine if acoustic stimulation can increase SWA and improve declarative memory in healthy older adults...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28335000/better-than-sham-a-double-blind-placebo-controlled-neurofeedback-study-in-primary-insomnia
#2
Manuel Schabus, Hermann Griessenberger, Maria-Teresa Gnjezda, Dominik P J Heib, Malgorzata Wislowska, Kerstin Hoedlmoser
Neurofeedback training builds upon the simple concept of instrumental conditioning, i.e. behaviour that is rewarded is more likely to reoccur, an effect Thorndike referred to as the 'law of effect'. In the case of neurofeedback, information about specific electroencephalographic activity is fed back to the participant who is rewarded whenever the desired electroencephalography pattern is generated. If some kind of hyperarousal needs to be addressed, the neurofeedback community considers sensorimotor rhythm neurofeedback as the gold standard...
February 23, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28334879/altered-sleep-homeostasis-correlates-with-cognitive-impairment-in-patients-with-focal-epilepsy
#3
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/28328788/early-presence-of-sleep-spindles-on-electroencephalography-is-associated-with-good-outcome-after-pediatric-cardiac-arrest
#4
Laurence Ducharme-Crevier, Craig A Press, Jonathan E Kurz, Michele G Mills, Joshua L Goldstein, Mark S Wainwright
OBJECTIVES: The role of sleep architecture as a biomarker for prognostication after resuscitation from cardiac arrest in children hospitalized in an ICU remains poorly defined. We sought to investigate the association between features of normal sleep architecture in children after cardiac arrest and a favorable neurologic outcome at 6 months. DESIGN: Retrospective review of medical records and continuous electroencephalography monitoring. SETTING: Cardiac and PICU of a tertiary children's hospital...
March 21, 2017: Pediatric Critical Care Medicine
https://www.readbyqxmd.com/read/28325926/night-and-day-variations-of-sleep-in-patients-with-disorders-of-consciousness
#5
Malgorzata Wislowska, Renata Del Giudice, Julia Lechinger, Tomasz Wielek, Dominik P J Heib, Alain Pitiot, Gerald Pichler, Gabriele Michitsch, Johann Donis, Manuel Schabus
Brain injuries substantially change the entire landscape of oscillatory dynamics and render detection of typical sleep patterns difficult. Yet, sleep is characterized not only by specific EEG waveforms, but also by its circadian organization. In the present study we investigated whether brain dynamics of patients with disorders of consciousness systematically change between day and night. We recorded ~24 h EEG at the bedside of 18 patients diagnosed to be vigilant but unaware (Unresponsive Wakefulness Syndrome) and 17 patients revealing signs of fluctuating consciousness (Minimally Conscious State)...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28303099/meet-spinky-an-open-source-spindle-and-k-complex-detection-toolbox-validated-on-the-open-access-montreal-archive-of-sleep-studies-mass
#6
Tarek Lajnef, Christian O'Reilly, Etienne Combrisson, Sahbi Chaibi, Jean-Baptiste Eichenlaub, Perrine M Ruby, Pierre-Emmanuel Aguera, Mounir Samet, Abdennaceur Kachouri, Sonia Frenette, Julie Carrier, Karim Jerbi
Sleep spindles and K-complexes are among the most prominent micro-events observed in electroencephalographic (EEG) recordings during sleep. These EEG microstructures are thought to be hallmarks of sleep-related cognitive processes. Although tedious and time-consuming, their identification and quantification is important for sleep studies in both healthy subjects and patients with sleep disorders. Therefore, procedures for automatic detection of spindles and K-complexes could provide valuable assistance to researchers and clinicians in the field...
2017: Frontiers in Neuroinformatics
https://www.readbyqxmd.com/read/28269503/differentiation-of-spindle-associated-hippocampal-hfos-based-on-a-correlation-analysis
#7
Daniel Lachner Piza, Jonas C Bruder, Julia Jacobs, Andreas Schulze-Bonhage, Thomas Stieglitz, Matthias Dumpelmann
High Frequency Oscillations (HFOs) have been described as biomarkers of epileptogenic tissue; however their pathological/physiological classification poses a challenge to their predictive power. For the population of ripples co-occurring with sleep spindles, those ripples improving the antiparallel correlation of ripple-peaks and sleep spindle-troughs were classified as coupled-ripples and the rest as uncoupled-ripples. For the same population of ripples two reference groups called in-SOZ and non-SOZ were formed according to the ripples' location inside or outside the seizure onset zone (SOZ)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269102/sleep-spindle-identification-on-eeg-signals-from-polysomnographie-recordings-using-correntropy
#8
Sebastian Ulloa, Pablo A Estevez, Pablo Huijse, Claudio M Held, Claudio A Perez, Rodrigo Chamorro, Marcelo Garrido, Cecilia Algarin, Patricio Peirano
Sleep spindles (SSs) are characteristic electroencephalographic (EEG) waveforms of sleep stages N2 and N3. One of the main problems associated with SS detection is the high number of false positives. In this paper we propose a new periodogram based on correntropy to detect SSs and enhance their characterization. Correntropy is a generalized correlation, under the information theoretic learning framework. A non-negative matrix factorization decomposition of correntropy allows us to obtain a new periodogram, which shows an improved resolution capability compared to the conventional power spectrum density...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28261503/cpap-treatment-partly-normalizes-sleep-spindle-features-in-obstructive-sleep-apnea
#9
Tiia Saunamäki, Eero Huupponen, Juho Loponen, Sari-Leena Himanen
Objective. Obstructive sleep apnea (OSA) decreases sleep spindle density and frequency. We evaluated the effects of continuous positive airway pressure (CPAP) treatment on different features of sleep spindles. Methods. Twenty OSA patients underwent two night polysomnographies in a diagnostic phase and one night polysomnography after 6 months of CPAP treatment. The control group comprised 20 healthy controls. Sleep spindles were analyzed by a previously developed automated method. Unilateral and bilateral spindles were identified in central and frontopolar brain locations...
2017: Sleep Disorders
https://www.readbyqxmd.com/read/28251306/k-complexes-spindles-and-erps-as-impulse-responses-unification-via-neural-field-theory
#10
M S Zobaer, R M Anderson, C C Kerr, P A Robinson, K K H Wong, A L D'Rozario
To interrelate K-complexes, spindles, evoked response potentials (ERPs), and spontaneous electroencephalography (EEG) using neural field theory (NFT), physiology-based NFT of the corticothalamic system is used to model cortical excitatory and inhibitory populations and thalamic relay and reticular nuclei. The impulse response function of the model is used to predict the responses to impulses, which are compared with transient waveforms in sleep studies. Fits to empirical data then allow underlying brain physiology to be inferred and compared with other waves...
March 1, 2017: Biological Cybernetics
https://www.readbyqxmd.com/read/28246641/coordinated-infraslow-neural-and-cardiac-oscillations-mark-fragility-and-offline-periods-in-mammalian-sleep
#11
Sandro Lecci, Laura M J Fernandez, Frederik D Weber, Romain Cardis, Jean-Yves Chatton, Jan Born, Anita Lüthi
Rodents sleep in bouts lasting minutes; humans sleep for hours. What are the universal needs served by sleep given such variability? In sleeping mice and humans, through monitoring neural and cardiac activity (combined with assessment of arousability and overnight memory consolidation, respectively), we find a previously unrecognized hallmark of sleep that balances two fundamental yet opposing needs: to maintain sensory reactivity to the environment while promoting recovery and memory consolidation. Coordinated 0...
February 2017: Science Advances
https://www.readbyqxmd.com/read/28238858/automatic-detection-of-periods-of-slow-wave-sleep-based-on-intracranial-depth-electrode-recordings
#12
Chrystal M Reed, Kurtis G Birch, Jan Kamiński, Shannon Sullivan, Jeffrey M Chung, Adam N Mamelak, Ueli Rutishauser
BACKGROUND: An automated process for sleep staging based on intracranial EEG data alone is needed to facilitate research into the neural processes occurring during slow wave sleep (SWS). Current manual methods for sleep scoring require a full polysomnography (PSG) set-up, including electrooculography (EOG), electromyography (EMG), and scalp electroencephalography (EEG). This set-up can be technically difficult to place in the presence of intracranial EEG electrodes. There is thus a need for a method for sleep staging based on intracranial recordings alone...
February 24, 2017: Journal of Neuroscience Methods
https://www.readbyqxmd.com/read/28227755/differentiation-of-spindle-associated-hippocampal-hfos-based-on-a-correlation-analysis
#13
Daniel Lachner Piza, Jonas C Bruder, Julia Jacobs, Andreas Schulze-Bonhage, Thomas Stieglitz, Matthias Dumpelmann, Daniel Lachner Piza, Jonas C Bruder, Julia Jacobs, Andreas Schulze-Bonhage, Thomas Stieglitz, Matthias Dumpelmann, Thomas Stieglitz, Matthias Dumpelmann, Jonas C Bruder, Andreas Schulze-Bonhage, Daniel Lachner Piza, Julia Jacobs
High Frequency Oscillations (HFOs) have been described as biomarkers of epileptogenic tissue; however their pathological/physiological classification poses a challenge to their predictive power. For the population of ripples co-occurring with sleep spindles, those ripples improving the antiparallel correlation of ripple-peaks and sleep spindle-troughs were classified as coupled-ripples and the rest as uncoupled-ripples. For the same population of ripples two reference groups called in-SOZ and non-SOZ were formed according to the ripples' location inside or outside the seizure onset zone (SOZ)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227327/sleep-spindle-identification-on-eeg-signals-from-polysomnographie-recordings-using-correntropy
#14
Sebastian Ulloa, Pablo A Estevez, Pablo Huijse, Claudio M Held, Claudio A Perez, Rodrigo Chamorro, Marcelo Garrido, Cecilia Algarin, Patricio Peirano, Sebastian Ulloa, Pablo A Estevez, Pablo Huijse, Claudio M Held, Claudio A Perez, Rodrigo Chamorro, Marcelo Garrido, Cecilia Algarin, Patricio Peirano, Pablo A Estevez, Marcelo Garrido, Sebastian Ulloa, Claudio A Perez, Pablo Huijse, Rodrigo Chamorro, Cecilia Algarin, Patricio Peirano, Claudio M Held
Sleep spindles (SSs) are characteristic electroencephalographic (EEG) waveforms of sleep stages N2 and N3. One of the main problems associated with SS detection is the high number of false positives. In this paper we propose a new periodogram based on correntropy to detect SSs and enhance their characterization. Correntropy is a generalized correlation, under the information theoretic learning framework. A non-negative matrix factorization decomposition of correntropy allows us to obtain a new periodogram, which shows an improved resolution capability compared to the conventional power spectrum density...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28215249/altered-sleep-architecture-during-the-first-months-of-life-in-infants-born-to-depressed-mothers
#15
Flora Bat-Pitault, Gianluca Sesso, Christine Deruelle, Sophie Flori, Véronique Porcher-Guinet, Camille Stagnara, Aurore Guyon, Sabine Plancoulaine, Joëlle Adrien, David Da Fonseca, Hugues Patural, Patricia Franco
OBJECTIVE: This study investigated sleep architecture in newborn and six-month-old infants who were born to depressed mothers. METHOD: Sixty-four healthy full-term infants (32 males and 32 females) participated in the study. Of these, 32 were high-risk infants who were born to mothers diagnosed with depression, and 32 were low-risk infants born to mothers without a personal history of depression. 24-hour polysomnography was recorded at zero and six months of age (M0 and M6)...
February 2017: Sleep Medicine
https://www.readbyqxmd.com/read/28185047/histaminergic-h1-and-h2-receptors-mediate-the-effects-of-propofol-on-the-noradrenalin-inhibited-neurons-in-rat-ventrolateral-preoptic-nucleus
#16
Yang Liu, Yu Zhang, Kun Qian, Lin Zhang, Tian Yu
The ventrolateral preoptic nucleus is a sleep-promoting nucleus located in the basal forebrain. A commonly used intravenous anesthetic, propofol, had been reported to induce sleep spindles and augment the firing rate of neurons in ventrolateral preoptic nucleus, but the underlining mechanism is yet to be known. By using patch clamp recording on neuron in acute brain slice, present study tested if histaminergic H1 and H2 receptors play a role in the effect of propofol on the noradrenalin-inhibited neurons in ventrolateral preoptic nucleus...
February 9, 2017: Neurochemical Research
https://www.readbyqxmd.com/read/28095202/interpretation-of-the-precision-matrix-and-its-application-in-estimating-sparse-brain-connectivity-during-sleep-spindles-from-human-electrocorticography-recordings
#17
Anup Das, Aaron L Sampson, Claudia Lainscsek, Lyle Muller, Wutu Lin, John C Doyle, Sydney S Cash, Eric Halgren, Terrence J Sejnowski
The correlation method from brain imaging has been used to estimate functional connectivity in the human brain. However, brain regions might show very high correlation even when the two regions are not directly connected due to the strong interaction of the two regions with common input from a third region. One previously proposed solution to this problem is to use a sparse regularized inverse covariance matrix or precision matrix (SRPM) assuming that the connectivity structure is sparse. This method yields partial correlations to measure strong direct interactions between pairs of regions while simultaneously removing the influence of the rest of the regions, thus identifying regions that are conditionally independent...
March 2017: Neural Computation
https://www.readbyqxmd.com/read/28093830/age-affects-sleep-microstructure-more-than-sleep-macrostructure
#18
Johanna F A Schwarz, Torbjörn Åkerstedt, Eva Lindberg, Georg Gruber, Håkan Fischer, Jenny Theorell-Haglöw
It is well known that the quantity and quality of physiological sleep changes across age. However, so far the effect of age on sleep microstructure has been mostly addressed in small samples. The current study examines the effect of age on several measures of sleep macro- and microstructure in 211 women (22-71 years old) of the 'Sleep and Health in Women' study for whom ambulatory polysomnography was registered. Older age was associated with significantly lower fast spindle (effect size f(2)  = 0.32) and K-complex density (f(2)  = 0...
January 17, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28051138/prior-knowledge-is-essential-for-the-beneficial-effect-of-targeted-memory-reactivation-during-sleep
#19
Sabine Groch, Thomas Schreiner, Björn Rasch, Reto Huber, Ines Wilhelm
Prior knowledge speeds up system consolidation and accelerates integration of newly acquired memories into existing neocortical knowledge networks. By using targeted memory reactivations, we demonstrate that prior knowledge is also essential for successful reactivation and consolidation of memories during sleep, both on the behavioral and oscillatory level (i.e., theta and fast spindle activity). Thus, prior knowledge is a prerequisite for new memories to enter processes of system consolidation during sleep...
January 4, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28049718/patterns-of-organelle-ontogeny-through-a-cell-cycle-revealed-by-whole-cell-reconstructions-using-3d-electron-microscopy
#20
Louise Hughes, Samantha Borrett, Katie Towers, Tobias Starborg, Sue Vaughan
The major mammalian bloodstream form of the African sleeping sickness parasite Trypanosoma brucei multiplies rapidly and it is important to understand how these cells divide. Organelle inheritance involves complex spatiotemporal re-arrangements to ensure correct distribution to daughter cells. Serial block face scanning electron microscopy (SBF-SEM) was used to reconstruct whole individual cells at different stages of the cell cycle to give an unprecedented temporal, spatial and quantitative view of organelle division, inheritance and abscission in a eukaryotic cell...
January 3, 2017: Journal of Cell Science
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