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https://www.readbyqxmd.com/read/28545123/predictability-of-arousal-in-mouse-slow-wave-sleep-by-accelerometer-data
#1
Gustavo Zampier Dos Santos Lima, Sergio Roberto Lopes, Thiago Lima Prado, Bruno Lobao-Soares, George C do Nascimento, John Fontenele-Araujo, Gilberto Corso
Arousals can be roughly characterized by punctual intrusions of wakefulness into sleep. In a standard perspective, using human electroencephalography (EEG) data, arousals are associated to slow-wave rhythms and K-complex brain activity. The physiological mechanisms that give rise to arousals during sleep are not yet fully understood. Moreover, subtle body movement patterns, which may characterize arousals both in human and in animals, are usually not detectable by eye perception and are not in general present in sleep studies...
2017: PloS One
https://www.readbyqxmd.com/read/28537468/reactivation-of-interference-during-sleep-does-not-impair-ongoing-memory-consolidation
#2
Mitja Seibold, Björn Rasch, Jan Born, Susanne Diekelmann
Memory consolidation during sleep is assumed to rely on the repeated reactivation of newly encoded memories particularly during slow wave sleep (SWS). It has been proposed that reactivated memories during sleep - like during wakefulness - undergo a labilisation process, enabling the strengthening and integration of new memories into pre-existing networks. Here, we tested this idea by introducing interference directly during sleep in the reactivation/consolidation phase. We predicted that cueing interfering memories during sleep would impair the consolidation of recently learned memories...
May 24, 2017: Memory
https://www.readbyqxmd.com/read/28535638/-application-of-long-term-video-electroencephalogram-and-resting-state-functional-magnetic-resonance-imaging-in-detection-of-cognition-in-patients-with-benign-epilepsy-of-childhood-with-centrotemporal-spikes
#3
X X Yan, Q Yu, Y T Gao, L T Li, D H Yu, Y Chen, X J Yao, W D Yang, Z J Chen, J Z Yin, Y An, K Tan
Objective: To study the relationship between the changes of brain network and cognition in patients with benign epilepsy of childhood with centrotemporal spikes (BECTS) by using long term video electroencephalogram (VEEG) and resting-state functional magnetic resonance imaging (RS-fMRI) technology. Methods: Eleven patients with right-handed were recruited (from April 2015 to September 2016) from epilepsy specialist outpatients and functional department of neurosurgery of Tianjin Medical University General Hospital...
May 23, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28530229/deep-sleep-maintains-learning-efficiency-of-the-human-brain
#4
Sara Fattinger, Toon T de Beukelaar, Kathy L Ruddy, Carina Volk, Natalie C Heyse, Joshua A Herbst, Richard H R Hahnloser, Nicole Wenderoth, Reto Huber
It is hypothesized that deep sleep is essential for restoring the brain's capacity to learn efficiently, especially in regions heavily activated during the day. However, causal evidence in humans has been lacking due to the inability to sleep deprive one target area while keeping the natural sleep pattern intact. Here we introduce a novel approach to focally perturb deep sleep in motor cortex, and investigate the consequences on behavioural and neurophysiological markers of neuroplasticity arising from dedicated motor practice...
May 22, 2017: Nature Communications
https://www.readbyqxmd.com/read/28525646/sleep-during-menopausal-transition-a-six-year-follow-up
#5
Laura Lampio, Päivi Polo-Kantola, Sari-Leena Himanen, Samu Kurki, Eero Huupponen, Janne Engblom, Olli J Heinonen, Olli Polo, Tarja Saaresranta
Study Objectives: Menopausal transition is associated with increased dissatisfaction with sleep, but the effects on sleep architecture are conflicting. This prospective six-year follow-up study was designed to evaluate the changes in sleep stages and sleep continuity that occur in women during menopausal transition. Methods: Sixty women (mean age 46.0 years, SD 0.9) participated. All women were premenopausal at baseline, and at the six-year follow-up, women were in different stages of menopausal transition...
May 19, 2017: Sleep
https://www.readbyqxmd.com/read/28513589/decoding-material-specific-memory-reprocessing-during-sleep-in-humans
#6
M Schönauer, S Alizadeh, H Jamalabadi, A Abraham, A Pawlizki, S Gais
Neuronal learning activity is reactivated during sleep but the dynamics of this reactivation in humans are still poorly understood. Here we use multivariate pattern classification to decode electrical brain activity during sleep and determine what type of images participants had viewed in a preceding learning session. We find significant patterns of learning-related processing during rapid eye movement (REM) and non-REM (NREM) sleep, which are generalizable across subjects. This processing occurs in a cyclic fashion during time windows congruous to critical periods of synaptic plasticity...
May 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28506629/hippocampal-information-processing-across-sleep-wake-cycles
#7
REVIEW
Kenji Mizuseki, Hiroyuki Miyawaki
According to a two-stage memory consolidation model, during waking theta states, afferent activity from the neocortex to the hippocampus induces transient synaptic modification in the hippocampus, where the information is deposited as a labile form of memory trace. During subsequent sharp-wave ripples (SPW-Rs), the newly acquired hippocampal information is transferred to the neocortex and stored as a long-lasting memory trace. Consistent with this hypothesis, waking theta states and SPW-Rs distinctly control information flow in the hippocampal-entorhinal loop...
May 12, 2017: Neuroscience Research
https://www.readbyqxmd.com/read/28505502/sleep-in-the-northern-fur-seal
#8
REVIEW
Oleg I Lyamin, Lev M Mukhametov, Jerome M Siegel
The pattern of sleep in the fur seal, a semiaquatic pinniped, has several striking behavioral and physiological adaptations that allow this species to inhabit both the land and water environment. These features include unihemispheric slow wave sleep (USWS, also being unihemispheric waking), the ability to maintain movement for stabilization of the sleep posture and to briefly open one eye while having a sleep electroencephalogram (EEG) in one hemisphere. In vivo microdialysis studies suggest that acetylcholine release is required for cortical activation during USWS, and that monoamines are not required for USWS...
May 12, 2017: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/28501498/the-role-of-sleep-in-the-plasticity-of-the-olfactory-system
#9
REVIEW
Masahiro Yamaguchi
The central olfactory system mediates a variety of odor-guided behaviors crucial for maintenance of animal life. The olfactory neural circuit must be highly plastic to ensure that it responds appropriately to changing odor circumstances. Recent studies have revealed that the processing of odor information changes drastically during waking and sleep and that neural activity during sleep plays pivotal roles in the structural reorganization and functional plasticity of the olfactory system. While olfactory information from the external world is efficiently transferred to the olfactory cortex (OC) via the olfactory bulb (OB) during waking, this information flow is attenuated during slow-wave sleep: during slow-wave sleep, the OC neurons exhibit synchronous discharges without odor input under the entrainment of sharp waves in the local field potential recording...
May 10, 2017: Neuroscience Research
https://www.readbyqxmd.com/read/28501473/electrical-status-epilepticus-during-sleep-in-mowat-wilson-syndrome
#10
Paolo Bonanni, Susanna Negrin, Anna Volzone, Nicoletta Zanotta, Roberta Epifanio, Claudio Zucca, Elisa Osanni, Elisa Petacchi, Franco Fabbro
AIM: Mowat-Wilson Syndrome (MWS) is a genetic rare disease. Epilepsy is present in 70-75% of Patients and an age-dependent electroclinical pattern has been described. Up to date, there are studies with overnight sleep EEGs, probably because of the severe intellectual disability (ID) and hyperactivity of these Patients. Our purpose was to verify the hypothesis that MWS Patients might have electrical status epilepticus in slow wave sleep (ESES pattern). METHODS: A retrospective analysis of anamnestic and electrographic data was performed on 7 consecutive MWS Patients followed between 2007 and 2016...
May 10, 2017: Brain & Development
https://www.readbyqxmd.com/read/28500870/brainstem-regulation-of-slow-wave-sleep
#11
REVIEW
Christelle Anaclet, Patrick M Fuller
Recent work has helped reconcile puzzling results from brainstem transection studies first performed over 60 years ago, which suggested the existence of a sleep-promoting system in the medullary brainstem. It was specifically shown that GABAergic neurons located in the medullary brainstem parafacial zone (PZ(GABA)) are not only necessary for normal slow-wave-sleep (SWS) but that their selective activation is sufficient to induce SWS in behaving animals. In this review we discuss early experimental findings that inspired the hypothesis that the caudal brainstem contained SWS-promoting circuitry...
May 10, 2017: Current Opinion in Neurobiology
https://www.readbyqxmd.com/read/28493346/no-effect-of-targeted-memory-reactivation-during-slow-wave-sleep-on-emotional-recognition-memory
#12
Jennifer E Ashton, Scott A Cairney, M Gareth Gaskell
Recent work has suggested that the benefits of sleep for memory consolidation are enhanced for highly salient (versus non-salient) memories. Using a technique known as targeted memory reactivation, it is possible to selectively strengthen newly learned memories by re-exposing the sleeping brain to auditory cues. The aim of the current study was to examine whether emotionally salient memories are also more responsive to targeted memory reactivation in slow-wave sleep than neutral memories. In an initial training phase, participants memorised emotionally negative and neutral pictures, which were each paired with a semantically related sound...
May 11, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28488395/shorter-duration-of-non-rapid-eye-movement-sleep-slow-waves-in-epha4-knockout-mice
#13
Marlène Freyburger, Gaétan Poirier, Julie Carrier, Valérie Mongrain
Slow waves occurring during non-rapid eye movement sleep have been associated with neurobehavioural performance and memory. In addition, the duration of previous wakefulness and sleep impacts characteristics of these slow waves. However, molecular mechanisms regulating the dynamics of slow-wave characteristics remain poorly understood. The EphA4 receptor regulates glutamatergic transmission and synaptic plasticity, which have both been linked to sleep slow waves. To investigate if EphA4 regulates slow-wave characteristics during non-rapid eye movement sleep, we compared individual parameters of slow waves between EphA4 knockout mice and wild-type littermates under baseline conditions and after a 6-h sleep deprivation...
May 10, 2017: Journal of Sleep Research
https://www.readbyqxmd.com/read/28484371/state-dependent-modulation-of-slow-wave-motifs-towards-awakening
#14
Daisuke Shimaoka, Chenchen Song, Thomas Knöpfel
Slow cortical waves that propagate across the cerebral cortex forming large-scale spatiotemporal propagation patterns are a hallmark of non-REM sleep and anesthesia, but also occur during resting wakefulness. To investigate how the spatial temporal properties of slow waves change with the depth of anesthetic, we optically imaged population voltage transients generated by mouse layer 2/3 pyramidal neurons across one or two cortical hemispheres dorsally with a genetically encoded voltage indicator (GEVI). From deep barbiturate anesthesia to light barbiturate sedation, depolarizing wave events recruiting at least 50% of the imaged cortical area consistently appeared as a conserved repertoire of distinct wave motifs...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28481337/inadequate-sleep-as-a-contributor-to-type-2-diabetes-in-children-and-adolescents
#15
REVIEW
C Dutil, J-P Chaput
Lack of sleep is a modifiable risk factor for adverse health in humans. Short sleep duration and poor sleep quality are common in the pediatric population; the largest decline in sleep duration over the past decades has been seen in children and adolescents. The objective of the present narrative review was to provide for the first time an overview of the literature on sleep and its association with type 2 diabetes mellitus (T2D) biomarkers in children and adolescents. For this narrative review, 23 studies were retained (21 observational and 2 experimental studies)...
May 8, 2017: Nutrition & Diabetes
https://www.readbyqxmd.com/read/28472667/the-effects-of-spectral-tuning-of-evening-ambient-light-on-melatonin-suppression-alertness-and-sleep
#16
Shadab A Rahman, Melissa A St Hilaire, Steven W Lockley
We compared the effects of bedroom-intensity light from a standard fluorescent and a blue- (i.e., short-wavelength) depleted LED source on melatonin suppression, alertness, and sleep. Sixteen healthy participants (8 females) completed a 4-day inpatient study. Participants were exposed to blue-depleted circadian-sensitive (C-LED) light and a standard fluorescent light (FL, 4100K) of equal illuminance (50lx) for 8h prior to a fixed bedtime on two separate days in a within-subject, randomized, cross-over design...
May 1, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28465841/-are-we-in-sync-with-each-other-exploring-the-effects-of-cosleeping-on-heterosexual-couples-sleep-using-simultaneous-polysomnography-a-pilot-study
#17
Henning Johannes Drews, Sebastian Wallot, Sara Lena Weinhold, Panagiotis Mitkidis, Paul Christian Baier, Andreas Roepstorff, Robert Göder
The present study aimed to explore dynamic and interactive aspects of cosleep in heterosexual couples. The sample consisted of eight young healthy adults who belonged to four heterosexual couples with a good relationship quality and a history of cosleeping. All individuals underwent simultaneous polysomnography in a sleep laboratory for four nights in which they slept individually and with their partner. Also, a sleep protocol of subjective sleep measures was completed. Statistical analyses included cross recurrence quantification analysis to assess synchronization during sleep...
2017: Sleep Disorders
https://www.readbyqxmd.com/read/28465166/sleeping-on-the-motor-engram-the-multifaceted-nature-of-sleep-related-motor-memory-consolidation
#18
REVIEW
Bradley R King, Kerstin Hoedlmoser, Franziska Hirschauer, Nina Dolfen, Genevieve Albouy
For the past two decades, it has generally been accepted that sleep benefits motor memory consolidation processes. This notion, however, has been challenged by recent studies and thus the sleep and motor memory story is equivocal. Currently, and in contrast to the declarative memory domain, a comprehensive overview and synthesis of the effects of post-learning sleep on the behavioral and neural correlates of motor memory consolidation is not available. We therefore provide an extensive review of the literature in order to highlight that sleep-dependent motor memory consolidation depends upon multiple boundary conditions, including particular features of the motor task, the recruitment of relevant neural substrates (and the hippocampus in particular), as well as the specific architecture of the intervening sleep period (specifically, sleep spindle and slow wave activity)...
April 29, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28462721/the-expression-and-purification-of-the-delta-sleep-inducing-peptide-fused-with-protein-transduction-domain-and-human-serum-albumin-in-pichia-pastoris
#19
Xin-Guo Zhang, Wen-Na Wang, Chun-Sheng Zhang, Kun Li, Guo-Di Ma, Jian-Yong Li
Delta sleep-inducing peptide (DSIP) is a nonapeptide that could promote sleep through the induction of slow wave sleep. To further study the pharmacological effect of DSIP on insomnia, we designed a fusion protein containing N-terminal TAT-based transduction domain followed by human serum albumin and DSIP and designated this protein as PHD fusion protein. We expressed PHD fusion protein in Pichia pastoris, purified it to near homogeneity by three-step chromatography and performed bioactivity assay. The pharmacological activity of PHD fusion protein was studied using classic pentobarbital-induced sleep test in healthy mice...
April 25, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28460798/from-the-midnight-sun-to-the-longest-night-sleep-in-antarctica
#20
REVIEW
Nathalie Pattyn, Martine Van Puyvelde, Helio Fernandez-Tellez, Bart Roelands, Olivier Mairesse
Sleep disturbances are the main health complaints from personnel deployed in Antarctica. The current paper presents a systematic review of research findings on sleep disturbances in Antarctica. The available sources were divided in three categories: results based on questionnaire surveys or sleep logs, studies using actigraphy, and data from polysomnography results. Other areas relevant to the issue were also examined. These included chronobiology, since the changes in photoperiod have been known to affect circadian rhythms, mood disturbances, exercise, sleep and hypoxia, countermeasure investigations in Antarctica, and other locations lacking a normal photoperiod...
March 14, 2017: Sleep Medicine Reviews
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