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https://www.readbyqxmd.com/read/29161269/identifying-influential-neighbors-in-animal-flocking
#1
Li Jiang, Luca Giuggioli, Andrea Perna, Ramón Escobedo, Valentin Lecheval, Clément Sire, Zhangang Han, Guy Theraulaz
Schools of fish and flocks of birds can move together in synchrony and decide on new directions of movement in a seamless way. This is possible because group members constantly share directional information with their neighbors. Although detecting the directionality of other group members is known to be important to maintain cohesion, it is not clear how many neighbors each individual can simultaneously track and pay attention to, and what the spatial distribution of these influential neighbors is. Here, we address these questions on shoals of Hemigrammus rhodostomus, a species of fish exhibiting strong schooling behavior...
November 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/29159061/eeg-coherence-related-to-fmri-resting-state-synchrony-in-long-term-abstinent-alcoholics
#2
Valerie A Cardenas, Mathew Price, George Fein
Recent work suggests that faulty co-activation or synchrony of multiple brain regions comprising "networks," or an imbalance between opposing brain networks, is important in alcoholism. Previous studies showed higher fMRI resting state synchrony (RSS) within the executive control (inhibitory control and emotion regulation) networks and lower RSS within the appetitive drive network in long-term (multi-year) abstinent alcoholics (LTAA) vs. non substance abusing controls (NSAC). Our goal was to identify EEG networks that are correlated with the appetitive drive and executive function networks identified with fMRI in our previous alcohol studies...
2018: NeuroImage: Clinical
https://www.readbyqxmd.com/read/29157220/combined-effects-of-leaks-respiratory-system-properties-and-upper-airway-patency-on-the-performance-of-home-ventilators-a-bench-study
#3
Kaixian Zhu, Claudio Rabec, Jésus Gonzalez-Bermejo, Sébastien Hardy, Sami Aouf, Pierre Escourrou, Gabriel Roisman
BACKGROUND: Combined effects of leaks, mechanical property of respiratory system and upper airway (UA) patency on patient-ventilator synchrony (PVA) and the level of clinically "tolerable" leaks are not well established in home ventilators. METHODS: We comparatively assessed on a bench model, the highest leak level tolerated without inducing significant asynchrony ("critical leak") in three home ventilators (Astral 150, Trilogy 100 and Vivo 60; noted as A150, T100 and V60 respectively) subjected to three simulated diseased respiratory conditions: chronic obstructive pulmonary disease (COPD), obesity hypoventilation (OHS) and neuromuscular disorders (NMD), with both open and closed UA...
November 21, 2017: BMC Pulmonary Medicine
https://www.readbyqxmd.com/read/29154569/the-social-transmission-of-risk-maternal-stress-physiology-synchronous-parenting-and-well-being-mediate-the-effects-of-war-exposure-on-child-psychopathology
#4
Galit Halevi, Amir Djalovski, Yaniv Kanat-Maymon, Karen Yirmiya, Orna Zagoory-Sharon, Lee Koren, Ruth Feldman
While chronic early stress increases child susceptibility to psychopathology, risk and resilience trajectories are shaped by maternal social influences whose role requires much further research in longitudinal studies. We examined the social transmission of risk by assessing paths leading from war-exposure to child symptoms as mediated by 3 sources of maternal social influence; stress physiology, synchronous parenting, and psychiatric disorder. Mothers and children living in a zone of continuous war were assessed in early childhood (1...
November 2017: Journal of Abnormal Psychology
https://www.readbyqxmd.com/read/29147756/locus-and-gene-based-gwas-meta-analysis-identifies-new-diabetic-nephropathy-genes
#5
Mohammad Saeed
Objective Assimilation of SNPs Interacting in Synchrony (OASIS) is a locus-based clustering algorithm recently described that can potentially address false positives and negatives in genome-wide association studies (GWAS) of complex disorders. Diabetic nephropathy (DN) is incompletely understood due to a paucity of genes identified despite several GWAS. OASIS was applied to three DN dbGAP GWAS datasets (4725 subjects; 1.06 million SNPs). OASIS identified 19 DN genes which were verified using single variant replication in a standard association study and gene-based analysis using GATES...
November 16, 2017: Immunogenetics
https://www.readbyqxmd.com/read/29145595/synchrony-weather-and-cycles-in-southern-pine-beetle-coleoptera-curculionidae
#6
John D Reeve
Spatial synchrony and cycles are common features of forest insect pests, but are often studied as separate phenomenon. Using time series of timber damage caused by Dendroctonus frontalis Zimmermann (Coleoptera: Curculionidae) (southern pine beetle) in 10 states within the southern United States, this study examines synchrony in D. frontalis abundance, the synchronizing effects of temperature extremes, and the evidence for shared cycles among state populations. Cross-correlation and cluster analyses are used to quantify synchrony across a range of geographic distances and to identify groups of states with synchronous dynamics...
November 14, 2017: Environmental Entomology
https://www.readbyqxmd.com/read/29141587/video-feedback-promotes-relations-between-infants-and-vulnerable-first-time-mothers-a-quasi-experimental-study
#7
Ingeborg Hedegaard Kristensen, Marianne Simonsen, Tea Trillingsgaard, Hanne Kronborg
BACKGROUND: Supporting early mother-infant relationships to ensure infants' future health has been recommended. The aim of this study was to investigate whether video feedback using the Marte Meo method promotes a healthy early relationship between infants and vulnerable first-time mothers. Video feedback or usual care was delivered by health visitors during home visits in Danish municipalities. METHODS: This quasi-experimental study included pre- and post-tests of 278 vulnerable families...
November 15, 2017: BMC Pregnancy and Childbirth
https://www.readbyqxmd.com/read/29134245/esophageal-pressure-research-or-clinical-tool
#8
REVIEW
E Baedorf Kassis, S H Loring, D Talmor
Esophageal manometry has traditionally been utilized for respiratory physiology research, but clinicians have recently found numerous applications within the intensive care unit. Esophageal pressure (PEs) is a surrogate for pleural pressures (PPl), and the difference between airway pressure (PAO) and PEs provides a good estimate for the pressure across the lung also known as the transpulmonary pressure (PL). Differentiating the effects of mechanical ventilation and spontaneous breathing on the respiratory system, chest wall, and across the lung allows for improved personalization in clinical decision making...
November 13, 2017: Medizinische Klinik, Intensivmedizin und Notfallmedizin
https://www.readbyqxmd.com/read/29127793/pest-management-under-climate-change-the-importance-of-understanding-tritrophic-relations
#9
REVIEW
V Castex, M Beniston, P Calanca, D Fleury, J Moreau
Plants and insects depend on climatic factors (temperature, solar radiation, precipitations, relative humidity and CO2) for their development. Current knowledge suggests that climate change can alter plants and insects development and affect their interactions. Shifts in tritrophic relations are of particular concern for Integrated Pest Management (IPM), because responses at the highest trophic level (natural enemies) are highly sensitive to warmer temperature. It is expected that natural enemies could benefit from better conditions for their development in northern latitudes and IPM could be facilitated by a longer period of overlap...
November 8, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29122591/spiking-and-excitatory-inhibitory-input-dynamics-of-barrel-cells-in-response-to-whisker-deflections-of-varying-velocity-and-angular-direction
#10
Mainak Patel
The spiking of barrel regular-spiking (RS) cells is tuned for both whisker deflection direction and velocity. Velocity tuning arises due to thalamocortical (TC) synchrony (but not spike quantity) varying with deflection velocity, coupled with feedforward inhibition, while direction selectivity is not fully understood, though may be due partly to direction tuning of TC spiking. Data show that as deflection direction deviates from the preferred direction of an RS cell, excitatory input to the RS cell diminishes minimally, but temporally shifts to coincide with the time-lagged inhibitory input...
November 6, 2017: Neuroscience
https://www.readbyqxmd.com/read/29121516/comparing-motor-performance-praxis-coordination-and-interpersonal-synchrony-between-children-with-and-without-autism-spectrum-disorder-asd
#11
Maninderjit Kaur, Sudha M Srinivasan, Anjana N Bhat
Children with Autism Spectrum Disorder (ASD) have basic motor impairments in balance, gait, and coordination as well as autism-specific impairments in praxis/motor planning and interpersonal synchrony. Majority of the current literature focuses on isolated motor behaviors or domains. Additionally, the relationship between cognition, symptom severity, and motor performance in ASD is unclear. We used a comprehensive set of measures to compare gross and fine motor, praxis/imitation, motor coordination, and interpersonal synchrony skills across three groups of children between 5 and 12 years of age: children with ASD with high IQ (HASD), children with ASD with low IQ (LASD), and typically developing (TD) children...
November 6, 2017: Research in Developmental Disabilities
https://www.readbyqxmd.com/read/29118318/rapid-termination-of-the-african-humid-period-triggered-by-northern-high-latitude-cooling
#12
James A Collins, Matthias Prange, Thibaut Caley, Luis Gimeno, Britta Beckmann, Stefan Mulitza, Charlotte Skonieczny, Didier Roche, Enno Schefuß
The rapidity and synchrony of the African Humid Period (AHP) termination at around 5.5 ka are debated, and it is unclear what caused a rapid hydroclimate response. Here we analysed the hydrogen isotopic composition of sedimentary leaf-waxes (δDwax) from the Gulf of Guinea, a proxy for regional precipitation in Cameroon and the central Sahel-Sahara. Our record indicates high precipitation during the AHP followed by a rapid decrease at 5.8-4.8 ka. The similarity with a δDwax record from northern East Africa suggests a large-scale atmospheric mechanism...
November 8, 2017: Nature Communications
https://www.readbyqxmd.com/read/29117988/an-overlooked-case-of-pacemaker-related-heart-failure
#13
Hitesh C Patel, Justin A Mariani
This case describes an iatrogenic cause of heart failure: the pacemaker syndrome. The diagnosis was initially overlooked but in retrospect could have easily been made by reviewing the rhythm strip recorded during the echocardiogram. The patient eventually received the correct treatment to restore atrioventricular synchrony and experienced rapid resolution to her disabling symptoms. LEARNING POINTS: New-onset heart failure following a pacemaker implant should be evaluated with an echocardiogram...
December 2017: Echo Research and Practice
https://www.readbyqxmd.com/read/29115666/potential-roles-of-metalloproteinases-of-endometrium-derived-exosomes-in-embryo-maternal-crosstalk-during-implantation
#14
REVIEW
Zeinab Latifi, Amir Fattahi, Ali Ranjbaran, Hamid Reza Nejabati, Kazuhiko Imakawa
During embryo implantation, crosstalk between the endometrial epithelium and the blastocyst, especially the trophoblasts, is a prerequisite for successful implantation. During this crosstalk, various molecular and functional changes occur to promote synchrony between the embryo and the endometrium as well as the uterine cavity microenvironment. In the past few years, growing evidence has shown that endometrium-derived exosomes play pivotal roles in the embryonic-maternal crosstalk during implantation, although the exact mechanism of this crosstalk has yet to be determined...
November 8, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/29107610/altered-resting-state-functional-connectivity-in-patients-with-obsessive-compulsive-disorder-a-magnetoencephalography-study
#15
Min Jung Koh, Jaeho Seol, Jee In Kang, Bong-Soo Kim, Kee Namkoong, Jin Woo Chang, Se Joo Kim
Aberrant cortical-striatal-thalamic-cortical circuits have been implicated in the pathophysiology of obsessive-compulsive disorder (OCD). However, the neurobiological basis of OCD remains unclear. We compared patterns of functional connectivity in patients with OCD and in healthy controls using resting-state magnetoencephalography (MEG). Participants comprised 24 patients with OCD (21 men, 3 women) and 22 age- and sex-matched healthy controls (19 men, 3 women). Resting-state measurements were obtained over a 6-min period using a 152-channel whole-head MEG system...
October 28, 2017: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/29106504/parvalbumin-positive-interneurons-regulate-neuronal-ensembles-in-visual-cortex
#16
Masakazu Agetsuma, Jordan P Hamm, Kentaro Tao, Shigeyoshi Fujisawa, Rafael Yuste
For efficient cortical processing, neural circuit dynamics must be spatially and temporally regulated with great precision. Although parvalbumin-positive (PV) interneurons can control network synchrony, it remains unclear how they contribute to spatio-temporal patterning of activity. We investigated this by optogenetic inactivation of PV cells with simultaneous two-photon Ca2+ imaging from populations of neurons in mouse visual cortex in vivo. For both spontaneous and visually evoked activity, PV interneuron inactivation decreased network synchrony...
July 6, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29101393/sensory-coding-accuracy-and-perceptual-performance-are-improved-during-the-desynchronized-cortical-state
#17
Charles B Beaman, Sarah L Eagleman, Valentin Dragoi
Cortical activity changes continuously during the course of the day. At a global scale, population activity varies between the 'synchronized' state during sleep and 'desynchronized' state during waking. However, whether local fluctuations in population synchrony during wakefulness modulate the accuracy of sensory encoding and behavioral performance is poorly understood. Here, we show that populations of cells in monkey visual cortex exhibit rapid fluctuations in synchrony ranging from desynchronized responses, indicative of high alertness, to highly synchronized responses...
November 3, 2017: Nature Communications
https://www.readbyqxmd.com/read/29101325/influence-of-facial-feedback-during-a-cooperative-human-robot-task-in-schizophrenia
#18
Laura Cohen, Mahdi Khoramshahi, Robin N Salesse, Catherine Bortolon, Piotr Słowiński, Chao Zhai, Krasimira Tsaneva-Atanasova, Mario Di Bernardo, Delphine Capdevielle, Ludovic Marin, Richard C Schmidt, Benoit G Bardy, Aude Billard, Stéphane Raffard
Rapid progress in the area of humanoid robots offers tremendous possibilities for investigating and improving social competences in people with social deficits, but remains yet unexplored in schizophrenia. In this study, we examined the influence of social feedbacks elicited by a humanoid robot on motor coordination during a human-robot interaction. Twenty-two schizophrenia patients and twenty-two matched healthy controls underwent a collaborative motor synchrony task with the iCub humanoid robot. Results revealed that positive social feedback had a facilitatory effect on motor coordination in the control participants compared to non-social positive feedback...
November 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29099846/discrimination-of-emotional-states-from-scalp-and-intracranial-eeg-using-multiscale-r%C3%A3-nyi-entropy
#19
Yelena Tonoyan, Theerasak Chanwimalueang, Danilo P Mandic, Marc M Van Hulle
A data-adaptive, multiscale version of Rényi's quadratic entropy (RQE) is introduced for emotional state discrimination from EEG recordings. The algorithm is applied to scalp EEG recordings of 30 participants watching 4 emotionally-charged video clips taken from a validated public database. Krippendorff's inter-rater statistic reveals that multiscale RQE of the mid-frontal scalp electrodes best discriminates between five emotional states. Multiscale RQE is also applied to joint scalp EEG, amygdala- and occipital pole intracranial recordings of an implanted patient watching a neutral and an emotionally charged video clip...
2017: PloS One
https://www.readbyqxmd.com/read/29099217/robust-weak-chimeras-in-oscillator-networks-with-delayed-linear-and-quadratic-interactions
#20
Christian Bick, Michael Sebek, István Z Kiss
We present an approach to generate chimera dynamics (localized frequency synchrony) in oscillator networks with two populations of (at least) two elements using a general method based on a delayed interaction with linear and quadratic terms. The coupling design yields robust chimeras through a phase-model-based design of the delay and the ratio of linear and quadratic components of the interactions. We demonstrate the method in the Brusselator model and experiments with electrochemical oscillators. The technique opens the way to directly bridge chimera dynamics in phase models and real-world oscillator networks...
October 20, 2017: Physical Review Letters
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