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Sleep Spindles

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https://www.readbyqxmd.com/read/29157588/sleep-spindles-may-predict-response-to-cognitive-behavioral-therapy-for-chronic-insomnia
#1
Thien Thanh Dang-Vu, Benjamin Hatch, Ali Salimi, Melodee Mograss, Soufiane Boucetta, Jordan O'Byrne, Marie Brandewinder, Christian Berthomier, Jean-Philippe Gouin
BACKGROUND: While cognitive-behavioral therapy for insomnia constitutes the first-line treatment for chronic insomnia, only few reports have investigated how sleep architecture relates to response to this treatment. In this pilot study, we aimed to determine whether pre-treatment sleep spindle density predicts treatment response to cognitive-behavioral therapy for insomnia. METHODS: Twenty-four participants with chronic primary insomnia participated in a 6-week cognitive-behavioral therapy for insomnia performed in groups of 4-6 participants...
November 2017: Sleep Medicine
https://www.readbyqxmd.com/read/29133062/anatomical-and-physiological-basis-of-continuous-spike-wave-of-sleep-syndrome-after-early-thalamic-lesions
#2
Alberto Leal, Eulália Calado, José P Vieira, Carla Mendonça, José C Ferreira, Hugo Ferreira, Daniel Carvalho, Fátima Furtado, Roseli Gomes, José P Monteiro
OBJECTIVE: Early neonatal thalamic lesions account for about 14% of continuous spike-wave of sleep (CSWS) syndrome, representing the most common etiology in this epileptic encephalopathy in children, and promise useful insights into the pathophysiology of the disease. METHODS: We describe nine patients with unilateral neonatal thalamic lesions which progressed to CSWS. Longitudinal whole-night and high-density electroencephalograms (EEGs) were performed, as well as detailed imaging and clinical evaluation...
November 10, 2017: Epilepsy & Behavior: E&B
https://www.readbyqxmd.com/read/29118106/sleep-in-humans-stabilizes-pattern-separation-performance
#3
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/29109037/lateralised-sleep-spindles-relate-to-false-memory-generation
#4
John J Shaw, Padraic Monaghan
Sleep is known to enhance false memories: After presenting participants with lists of semantically related words, sleeping before recalling these words results in a greater acceptance of unseen "lure" words related in theme to previously seen words. Furthermore, the right hemisphere (RH) seems to be more prone to false memories than the left hemisphere (LH). In the current study, we investigated the sleep architecture associated with these false memory and lateralisation effects in a nap study. Participants viewed lists of related words, then stayed awake or slept for approximately 90min, and were then tested for recognition of previously seen-old, unseen-new, or unseen-lure words presented either to the LH or RH...
November 3, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/29101344/dynamic-coupling-between-slow-waves-and-sleep-spindles-during-slow-wave-sleep-in-humans-is-modulated-by-functional-pre-sleep-activation
#5
Juliana Yordanova, Roumen Kirov, Rolf Verleger, Vasil Kolev
Co-existent sleep spindles and slow waves have been viewed as a mechanism for offline information processing. Here we explored if the temporal synchronization between slow waves and spindle activity during slow wave sleep (SWS) in humans was modulated by preceding functional activations during pre-sleep learning. We activated differentially the left and right hemisphere before sleep by using a lateralized variant of serial response time task (SRTT) and verified these inter-hemispheric differences by analysing alpha and beta electroencephalographic (EEG) activities during learning...
November 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29097698/circadian-preference-towards-morningness-is-associated-with-lower-slow-sleep-spindle-amplitude-and-intensity-in-adolescents
#6
Ilona Merikanto, Liisa Kuula, Tommi Makkonen, Róbert Bódizs, Risto Halonen, Kati Heinonen, Jari Lahti, Katri Räikkönen, Anu-Katriina Pesonen
Individual circadian preference types and sleep EEG patterns related to spindle characteristics, have both been associated with similar cognitive and mental health phenotypes. However, no previous study has examined whether sleep spindles would differ by circadian preference. Here, we explore if spindle amplitude, density, duration or intensity differ by circadian preference and whether these associations are moderated by spindle location, frequency, and time distribution across the night. The participants (N = 170, 59% girls; mean age = 16...
November 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29095855/impaired-memory-consolidation-in-children-with-obstructive-sleep-disordered-breathing
#7
Kiran Maski, Erin Steinhart, Hannah Holbrook, Eliot S Katz, Kush Kapur, Robert Stickgold
Memory consolidation is stabilized and even enhanced by sleep (and particularly by 12-15 Hz sleep spindles in NREM stage 2 sleep) in healthy children but it is unclear what happens to these processes when sleep is disturbed by obstructive sleep disordered breathing. This cross-sectional study investigates differences in declarative memory consolidation among children with primary snoring (PS) and obstructive sleep apnea (OSA) compared to controls. We further investigate whether memory consolidation group differences are associated with NREM stage 2 (N2) sigma (12-15 Hz) or NREM slow oscillation (0...
2017: PloS One
https://www.readbyqxmd.com/read/29090400/no-effects-of-successful-bidirectional-smr-feedback-training-on-objective-and-subjective-sleep-in-healthy-subjects
#8
Olaf Binsch, Ellen S Wilschut, Martijn Arns, Charelle Bottenheft, Pierre J L Valk, Eric H G J M Vermetten
There is a growing interest in the application of psychophysiological signals in more applied settings. Unidirectional sensory motor rhythm-training (SMR) has demonstrated consistent effects on sleep. In this study the main aim was to analyze to what extent participants could gain voluntary control over sleep-related parameters and secondarily to assess possible influences of this training on sleep metrics. Bidirectional training of SMR as well as heart rate variability (HRV) was used to assess the feasibility of training these parameters as possible brain computer interfaces (BCI) signals, and assess effects normally associated with unidirectional SMR training such as the influence on objective and subjective sleep parameters...
October 31, 2017: Applied Psychophysiology and Biofeedback
https://www.readbyqxmd.com/read/29089440/hippocampal-prefrontal-reactivation-during-learning-is-stronger-in-awake-as-compared-to-sleep-states
#9
Wenbo Tang, Justin D Shin, Loren M Frank, Shantanu P Jadhav
Hippocampal sharp-wave ripple (SWR) events occur during both behavior (awake SWRs) and slow-wave sleep (sleep SWRs). Awake and sleep SWRs both contribute to spatial learning and memory, thought to be mediated by the coordinated reactivation of behavioral experiences in hippocampal-cortical circuits seen during SWRs. Current hypotheses suggest that reactivation contributes to memory consolidation processes, but whether awake and sleep reactivation are suited to play similar or different roles remains unclear...
October 31, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29073146/unified-thalamic-model-generates-multiple-distinct-oscillations-with-state-dependent-entrainment-by-stimulation
#10
Guoshi Li, Craig S Henriquez, Flavio Fröhlich
The thalamus plays a critical role in the genesis of thalamocortical oscillations, yet the underlying mechanisms remain elusive. To understand whether the isolated thalamus can generate multiple distinct oscillations, we developed a biophysical thalamic model to test the hypothesis that generation of and transition between distinct thalamic oscillations can be explained as a function of neuromodulation by acetylcholine (ACh) and norepinephrine (NE) and afferent synaptic excitation. Indeed, the model exhibited four distinct thalamic rhythms (delta, sleep spindle, alpha and gamma oscillations) that span the physiological states corresponding to different arousal levels from deep sleep to focused attention...
October 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/29066556/seizures-and-sleep-in-the-thalamus-focal-limbic-seizures-show-divergent-activity-patterns-in-different-thalamic-nuclei
#11
Li Feng, Joshua E Motelow, Chanthia Ma, William Biche, Cian McCafferty, Nicholas Smith, Mengran Liu, Qiong Zhan, Ruonan Jia, Bo Xiao, Alvaro Duque, Hal Blumenfeld
The thalamus plays diverse roles in cortical-subcortical brain activity patterns. Recent work suggests that focal temporal lobe seizures depress subcortical arousal systems and convert cortical activity into a pattern resembling slow wave sleep. The potential simultaneous and paradoxical role of the thalamus in both limbic seizure propagation, and in sleep-like cortical rhythms has not been investigated. We recorded neuronal activity from the central lateral (CL), anterior (ANT) and ventral posteromedial (VPM) nuclei of the thalamus in an established female rat model of focal limbic seizures...
October 24, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29063522/remembering-specific-features-of-emotional-events-across-time-the-role-of-rem-sleep-and-prefrontal-theta-oscillations
#12
Marie Roxanne Sopp, Tanja Michael, Hans-Günter Weeß, Axel Mecklinger
When an episode of emotional significance is encountered, it often results in the formation of a highly resistant memory representation that is easily retrieved for many succeeding years. Recent research shows that beyond generic consolidation processes, rapid eye movement (REM) sleep importantly contributes to this effect. However, the boundary conditions of consolidation processes during REM sleep, specifically whether these extend to source memory, have not been examined extensively. The current study tested the effects of putative consolidation processes emerging during REM sleep and slow wave sleep (SWS) on item and source memory of negative and neutral images, respectively...
October 23, 2017: Cognitive, Affective & Behavioral Neuroscience
https://www.readbyqxmd.com/read/29054694/the-resilient-brain-and-the-guardians-of-sleep-new-perspectives-on-old-assumptions
#13
REVIEW
Liborio Parrino, Anna Elisabetta Vaudano
Resilience is the capacity of a system, enterprise or a person to maintain its core purpose and integrity in the face of dramatically changed circumstances. In human physiology, resilience is the capacity of adaptively overcoming stress and adversity while maintaining normal psychological and physical functioning. In this review, we investigate the resilient strategies of sleep. First, we discuss the concept of brain resilience, highlighting the modular structure of small-world networking, neuronal plasticity and critical brain behavior...
October 17, 2017: Sleep Medicine Reviews
https://www.readbyqxmd.com/read/29051216/prolyl-4-hydroxylase-domain-protein-3-overexpression-improved-obstructive-sleep-apnea-induced-cardiac-perivascular-fibrosis-partially-by-suppressing-endothelial-to-mesenchymal-transition
#14
Guang-Hao Zhang, Fu-Chao Yu, Yang Li, Qin Wei, Song-Song Song, Fang-Ping Zhou, Jia-Yi Tong
BACKGROUND: Intermittent hypoxia (IH) induced by obstructive sleep apnea is the key factor involved in cardiovascular fibrosis. Under persistent hypoxia condition, endothelial cells respond by endothelial-to-mesenchymal transition (EndMT), which is associated with cardiovascular fibrosis. Prolyl 4-hydroxylase domain protein 3 (PHD3) is a cellular oxygen sensor and its expression increased in hypoxia. However, its role in obstructive sleep apnea-induced EndMT and cardiovascular fibrosis is still uncertain...
October 19, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29034521/sleep-spindle-detection-using-multivariate-gaussian-mixture-models
#15
Chanakya Reddy Patti, Thomas Penzel, Dean Cvetkovic
In this research study we have developed a clustering-based automatic sleep spindle detection method that was evaluated on two different databases. The databases consisted of 20 all-night polysomnograph recordings. Past detection methods have been based on subject-independent and some subject-dependent parameters, such as fixed or variable thresholds to identify spindles. Using a multivariate Gaussian mixture model clustering technique, our algorithm was developed to use only subject-specific parameters to detect spindles...
October 16, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/29031741/further-evidences-for-sleep-instability-and-impaired-spindle-delta-dynamics-in-schizophrenia-a-whole-night-polysomnography-study-with-neuroloop-gain-and-sleep-cycle-analysis
#16
Arun Sasidharan, Sunil Kumar, Ajay Kumar Nair, Ammu Lukose, Vrinda Marigowda, John P John, Bindu M Kutty
OBJECTIVE: Sleep offers a unique window into the brain dysfunctions in schizophrenia. Many past sleep studies have reported abnormalities in both macro-sleep architecture (like increased awakenings) as well as micro-sleep-architecture (like spindle deficits) in patients with schizophrenia (PSZ). The present study attempts to replicate previous reports of macro- and micro-sleep-architectural abnormalities in schizophrenia. In addition, the study also examined sleep-stage changes and spindle-delta dynamics across sleep-cycles to provide further evidence in support of the dysfunctional thalamocortical mechanisms causing sleep instability and poor sleep maintenance associated with schizophrenia pathophysiology...
October 2017: Sleep Medicine
https://www.readbyqxmd.com/read/29026661/tenth-case-of-bilateral-hemifacial-spasm-treated-by-microvascular-decompression-review-of-the-pathophysiology
#17
REVIEW
Warley Carvalho da Silva Martins, Lucas Alverne Freitas de Albuquerque, Gervásio Teles Cardoso de Carvalho, Jules Carlos Dourado, Marcos Dellaretti, Atos Alves de Sousa
BACKGROUND: Bilateral hemifacial spasm (BHFS) is a rare neurological syndrome whose diagnosis depends on excluding other facial dyskinesias. We present a case of BHFS along with a literature review. METHODS: A 64-year-old white, hypertense male reported involuntary left hemiface contractions in 2001 (aged 50). In 2007, right hemifacial symptoms appeared, without spasm remission during sleep. Botulinum toxin type A application produced partial temporary improvement...
2017: Surgical Neurology International
https://www.readbyqxmd.com/read/29021536/eeg-transients-in-the-sigma-range-during-non-rem-sleep-predict-learning-in-dogs
#18
Ivaylo Borislavov Iotchev, Anna Kis, Róbert Bódizs, Gilles van Luijtelaar, Enikő Kubinyi
Sleep spindles are phasic bursts of thalamo-cortical activity, visible in the cortex as transient oscillations in the sigma range (usually defined in humans as 12-14 or 9-16 Hz). They have been associated with sleep-dependent memory consolidation and sleep stability in humans and rodents. Occurrence, frequency, amplitude and duration of sleep spindles co-vary with age, sex and psychiatric conditions. Spindle analogue activity in dogs has been qualitatively described, but never quantified and related to function...
October 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28993753/electroencephalography-in-the-diagnosis-of-genetic-generalized-epilepsy-syndromes
#19
REVIEW
Udaya Seneviratne, Mark J Cook, Wendyl Jude D'Souza
Genetic generalized epilepsy (GGE) consists of several syndromes diagnosed and classified on the basis of clinical features and electroencephalographic (EEG) abnormalities. The main EEG feature of GGE is bilateral, synchronous, symmetric, and generalized spike-wave complex. Other classic EEG abnormalities are polyspikes, epileptiform K-complexes and sleep spindles, polyspike-wave discharges, occipital intermittent rhythmic delta activity, eye-closure sensitivity, fixation-off sensitivity, and photoparoxysmal response...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28983246/sleep-an-open-source-python-software-for-visualization-analysis-and-staging-of-sleep-data
#20
Etienne Combrisson, Raphael Vallat, Jean-Baptiste Eichenlaub, Christian O'Reilly, Tarek Lajnef, Aymeric Guillot, Perrine M Ruby, Karim Jerbi
We introduce Sleep, a new Python open-source graphical user interface (GUI) dedicated to visualization, scoring and analyses of sleep data. Among its most prominent features are: (1) Dynamic display of polysomnographic data, spectrogram, hypnogram and topographic maps with several customizable parameters, (2) Implementation of several automatic detection of sleep features such as spindles, K-complexes, slow waves, and rapid eye movements (REM), (3) Implementation of practical signal processing tools such as re-referencing or filtering, and (4) Display of main descriptive statistics including publication-ready tables and figures...
2017: Frontiers in Neuroinformatics
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