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Cross-frequency coupling

Eefje S Poppelaars, Anita Harrewijn, P Michiel Westenberg, Melle J W van der Molen
Cross-frequency coupling (CFC) between frontal delta (1-4 Hz) and beta (14-30 Hz) oscillations has been suggested as a candidate neural correlate of social anxiety disorder, a disorder characterized by fear and avoidance of social and performance situations. Prior studies have used amplitude-amplitude correlation (AAC) as a CFC measure and hypothesized it as a candidate neural mechanism of affective control. However, using this metric has yielded inconsistent results regarding the direction of CFC, and the functional significance of coupling strength is uncertain...
May 17, 2018: Cognitive, Affective & Behavioral Neuroscience
David J Jörg, Luis G Morelli, Frank Jülicher
We introduce a stochastic model of coupled genetic oscillators in which chains of chemical events involved in gene regulation and expression are represented as sequences of Poisson processes. We characterize steady states by their frequency, their quality factor, and their synchrony by the oscillator cross correlation. The steady state is determined by coupling and exhibits stochastic transitions between different modes. The interplay of stochasticity and nonlinearity leads to isolated regions in parameter space in which the coupled system works best as a biological pacemaker...
March 2018: Physical Review. E
Spencer T Brinker, Steven P Kearney, Thomas J Royston, Dieter Klatt
The mechanical properties of tissue are sensitive to pathological changes, which is the basis for using dynamic elastography as a diagnostic tool. The purpose of this study is a concurrent cross-modality comparison of two dynamic elastography methods, Magnetic Resonance Elastography (MRE) and Scanning Laser Doppler Vibrometry (SLDV) using a single vibration source method. Cylindrical soft tissue mimicking specimens of Plastisol and Ecoflex are stimulated with 60, 100, 150, and 250 Hz sinusoidal vibration during imaging...
May 8, 2018: Journal of the Mechanical Behavior of Biomedical Materials
Mario Hernández Vera, Ersin Yurtsever, Roland Wester, Franco A Gianturco
We present an extensive range of accurate ab initio calculations, which map in detail the spatial electronic potential energy surface that describes the interaction between the molecular anion NH2 - (1 A1 ) in its ground electronic state and the He atom. The time-independent close-coupling method is employed to generate the corresponding rotationally inelastic cross sections, and then the state-changing rates over a range of temperatures from 10 to 30 K, which is expected to realistically represent the experimental trapping conditions for this ion in a radio frequency ion trap filled with helium buffer gas...
May 14, 2018: Journal of Chemical Physics
Coralie Purcell-Lévesque, Audrey Brassard, Belina Carranza-Mamane, Katherine Péloquin
OBJECTIVE: The purpose of the study was to examine the frequency of sexual difficulties and the associations among attachment insecurities (anxiety, avoidance) and sexual functioning (problems with sexual function, sexual dissatisfaction) in women and couples seeking fertility treatment. METHODS: In a cross-sectional study, 88 Canadian women and 45 couples receiving fertility treatments completed self-reported measures of adult attachment and sexual functioning...
May 11, 2018: Journal of Psychosomatic Obstetrics and Gynaecology
Swatantra Kumar, Vimal K Maurya, Himanshu R Dandu, Madan Lb Bhatt, Shailendra K Saxena
Among Human immunodeficiency virus (HIV) infected individuals, around two-thirds of patients present with neuroAIDS, where HIV-associated neurocognitive disorders (HAND), and HIV-associated dementia (HAD) are the most prevailing neurological complications. The neuropathology of neuroAIDS can be characterized by the presence of HIV infected macrophages and microglia in the brain, with the formation of multinucleated giant cells. Global predominant subtypes of HIV-1 clade B and C infections influence the differential effect of immune and neuronal dysfunctions, leading to clade-specific clinical variation in neuroAIDS patient cohorts...
May 8, 2018: Biomolecular Concepts
Zichuan Fan, Wentao Jiang, William M D Wright
This paper describes a completely non-contact ultrasonic method of gas flow metering using air-coupled leaky Lamb waves. To show proof of principle, a simplified representation of gas flow in a duct, comprising two separated thin isotropic plates with a gas flowing between them, has been modelled and investigated experimentally. An airborne compression wave emitted from an air-coupled capacitive ultrasonic transducer excited a leaky Lamb wave in the first plate in a non-contact manner. The leakage of this Lamb wave crossed the gas flow at an angle between the two plates as a compression wave, and excited a leaky Lamb wave in the second plate...
April 23, 2018: Ultrasonics
Yingwei Li, Haibing Zhang, Meiling Yu, Weiwei Yu, Blaise deB Frederick, Yunjie Tong
This study investigated the relationships of systemic low-frequency oscillations (sLFOs) measured at different peripheral sites in resting state, during passive leg raising (PLR), and during a paced breathing (PB) test. Twenty-five healthy subjects (21 to 57 years old; males: 13 and females: 12) were recruited for these experiments. During the experiments, the fluctuations of oxyhemoglobin concentration were measured at six peripheral sites (left and right toes, fingertips, and earlobes) using a multichannel near-infrared spectroscopy instrument developed by our group...
May 2018: Journal of Biomedical Optics
Tao Cheng, WenJin Liu, KangJian Yang, Xin He, Ping Yang, Bing Xu
It is well known that using two or more deformable mirrors (DMs) can improve the compensation ability of an adaptive optics (AO) system. However, to keep the stability of an AO system, the correlation between the multiple DMs must be suppressed during the correction. In this paper, we proposed a slope-based decoupling algorithm to simultaneous control the multiple DMs. In order to examine the validity and practicality of this algorithm, a typical woofer-tweeter (W-T) AO system was set up. For the W-T system, a theory model was simulated and the results indicated in theory that the algorithm we presented can selectively make woofer and tweeter correct different spatial frequency aberration and suppress the cross coupling between the dual DMs...
May 1, 2018: Applied Optics
Matthew D Johnson, Rebecca M Horne, Nathan R Hardy, Jared R Anderson
Using 5 waves of longitudinal survey data gathered from 3,405 couples, the present study investigates the temporal associations between self-reported couple conflict (frequency and each partner's constructive and withdrawing behaviors) and relationship perceptions (satisfaction and perceived instability). Autoregressive cross-lagged model results revealed couple conflict consistently predicted future relationship perceptions: More frequent conflict and withdrawing behaviors and fewer constructive behaviors foretold reduced satisfaction and conflict frequency and withdrawal heightened perceived instability...
May 3, 2018: Journal of Family Psychology: JFP
Abdelhafid Benksim, Noureddine Elkhoudri, Rachid Ait Addi, Abdellatif Baali, Mohamed Cherkaoui
Background: The main objective of this survey was to determine the difference between primary and secondary infertility in Morocco and the associated factors among women, who are referred to public and private health centers in Morocco. MATERIALS AND METHODS: In this cross-sectional study, 619 infertile women referring to public and private health centers in Marrakech-Safi region, were selected by simple random sampling method. This study was conducted between 1 October 2013 and 31 December 2015...
July 2018: International Journal of Fertility & Sterility
Philippe Albouy, Sylvain Baillet, Robert J Zatorre
Frequency-tuned noninvasive brain stimulation is a recent approach in cognitive neuroscience that involves matching the frequency of transcranially applied electromagnetic fields to that of specific oscillatory components of the underlying neurophysiology. The objective of this method is to modulate ongoing/intrinsic brain oscillations, which correspond to rhythmic fluctuations of neural excitability, to causally change behavior. We review the impact of frequency-tuned noninvasive brain stimulation on the research field of human working memory...
April 29, 2018: Annals of the New York Academy of Sciences
Sergey Lepeshov, Andrei Gorodetsky, Alexander Krasnok, Nikita Toropov, Tigran A Vartanyan, Pavel Belov, Andrea Alú, Edik U Rafailov
Advanced nanophotonics penetrates into other areas of science and technology, ranging from applied physics to biology, which results in many fascinating cross-disciplinary applications. It has been recently demonstrated that suitably engineered light-matter interactions at the nanoscale can overcome the limitations of today's terahertz (THz) photoconductive antennas, making them one step closer to many practical implications. Here, we push forward this concept by comprehensive numerical optimization and experimental investigation of a log-periodic THz photoconductive antenna coupled to a silver nanoantenna array...
April 26, 2018: Scientific Reports
Talel Badri, Amira Maamri, Yousri El Kissi
BACKGROUND: Pregnancy is a period during which anatomical, physiological and psychological changes may affect couple sexuality. AIM: To determine the knowledge and practices in sexuality, and identify the particularities of the sexual function during pregnancy. METHODS: A cross-sectional, descriptive and analytical study of pregnant women who responded to a questionnaire sent by Internet through a social network. RESULTS: Ninety-one percent of the 100 enrolled women were aged 25 to 34 years; 97% had a university education, and 66% were in the third quarter...
July 2017: La Tunisie Médicale
Stefan Klingler, Vivek Amin, Stephan Geprägs, Kathrin Ganzhorn, Hannes Maier-Flaig, Matthias Althammer, Hans Huebl, Rudolf Gross, Robert D McMichael, Mark D Stiles, Sebastian T B Goennenwein, Mathias Weiler
We investigate yttrium iron garnet (YIG)/cobalt (Co) heterostructures using broadband ferromagnetic resonance (FMR). We observe an efficient excitation of perpendicular standing spin waves (PSSWs) in the YIG layer when the resonance frequencies of the YIG PSSWs and the Co FMR line coincide. Avoided crossings of YIG PSSWs and the Co FMR line are found and modeled using mutual spin pumping and exchange torques. The excitation of PSSWs is suppressed by a thin aluminum oxide interlayer but persists with a copper interlayer, in agreement with the proposed model...
March 23, 2018: Physical Review Letters
Gilles Clément, Millard F Reschke
BACKGROUND: It has been proposed that individual susceptibility to motion sickness is related to the vestibulo-ocular reflex (VOR) through the activation of the velocity storage mechanism. OBJECTIVE: We investigated whether motion sickness level was related to the gain and phase of the VOR. METHODS: VOR gain and phase were measured in 214 subjects while they rotated in yaw at 0.01 Hz, 0.02 Hz, 0.04 Hz, 0.08 Hz, and 0.16 Hz in darkness, and results were compared to the severity of symptoms the subjects experienced during subsequent tests to provoke motion sickness...
April 18, 2018: Journal of Vestibular Research: Equilibrium & Orientation
Serene Sulyn Paul, Leland E Dibble, Raymond G Walther, Clough Shelton, Richard Klaus Gurgel, Mark Eric Lester
BACKGROUND: Individuals with unilateral vestibular hypofunction (UVH) alter their movement and reduce mobility to try to stabilize their gaze and avoid symptoms of dizziness and vertigo. OBJECTIVE: To determine if individuals with UVH 6 weeks after surgery demonstrate altered head and trunk kinematics during community ambulation. METHODS: A total of 15 vestibular schwannoma patients with documented postoperative unilateral vestibular loss and 9 healthy controls with symmetrical vestibulo-ocular reflexes participated in this cross-sectional study...
April 1, 2018: Neurorehabilitation and Neural Repair
Sigrun Goluch, Roberta Frass-Kriegl, Martin Meyerspeer, Michael Pichler, Jürgen Sieg, Martin Gajdošík, Martin Krššák, Elmar Laistler
13 C magnetic resonance spectroscopy is a viable, non-invasive method to study cell metabolism in skeletal muscles. However, MR sensitivity of 13 C is inherently low, which can be overcome by applying a higher static magnetic field strength together with radiofrequency coil arrays instead of single loop coils or large volume coils, and 1 H decoupling, which leads to a simplified spectral pattern. 1 H-decoupled 13 C-MRS requires RF coils which support both, 1 H and 13 C, Larmor frequencies with sufficient electromagnetic isolation between the pathways of the two frequencies...
April 18, 2018: Scientific Reports
Denise L Bellinger, Dianne Lorton
Immune-Mediated Inflammatory Diseases (IMIDs) is a descriptive term coined for an eclectic group of diseases or conditions that share common inflammatory pathways, and for which there is no definitive etiology. IMIDs affect the elderly most severely, with many older individuals having two or more IMIDs. These diseases include, but are not limited to, type-1 diabetes, obesity, hypertension, chronic pulmonary disease, coronary heart disease, inflammatory bowel disease, and autoimmunity, such as rheumatoid arthritis (RA), Sjőgren's syndrome, systemic lupus erythematosus, psoriasis, psoriatic arthritis, and multiple sclerosis...
April 13, 2018: International Journal of Molecular Sciences
Hossein Farshidi, Ahmadnoor Abdi, Abdulhussain Madani, Shahram Moshiri, Abolfazl Ghasemi, Ruhollah Hakimian
Background: Percutaneous coronary intervention (PCI) is the most common revascularization procedure, with over 1 million performed each year, worldwide. Over the past 20 years, the increasing experience of operators coupled with the advent of newer technologies, including coronary stents and a variety of adjuvant drug therapies, have permitted more successful procedures and decreased the morbidity associated with PCIs. Objective: To identify the incidence, predictors, and clinical implications of Major Adverse Cardiovascular Events (MACE) after PCIs...
February 2018: Electronic Physician
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