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Cross frequency coupling

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https://www.readbyqxmd.com/read/29227989/non-linear-auto-regressive-models-for-cross-frequency-coupling-in-neural-time-series
#1
Tom Dupré la Tour, Lucille Tallot, Laetitia Grabot, Valérie Doyère, Virginie van Wassenhove, Yves Grenier, Alexandre Gramfort
We address the issue of reliably detecting and quantifying cross-frequency coupling (CFC) in neural time series. Based on non-linear auto-regressive models, the proposed method provides a generative and parametric model of the time-varying spectral content of the signals. As this method models the entire spectrum simultaneously, it avoids the pitfalls related to incorrect filtering or the use of the Hilbert transform on wide-band signals. As the model is probabilistic, it also provides a score of the model "goodness of fit" via the likelihood, enabling easy and legitimate model selection and parameter comparison; this data-driven feature is unique to our model-based approach...
December 11, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/29223000/bilateral-preictal-signature-of-phase-amplitude-coupling-in-canine-epilepsy
#2
Laura Gagliano, Elie Bou Assi, Dang K Nguyen, Sandy Rihana, Mohamad Sawan
Seizure forecasting would improve the quality of life of patients with refractory epilepsy. Although early findings were optimistic, no single feature has been found capable of individually characterizing brain dynamics during transition to seizure. Cross-frequency phase amplitude coupling has been recently proposed as a precursor of seizure activity. This work evaluates the existence of a statistically significant difference in mean phase amplitude coupling distribution between the preictal and interictal states of seizures in dogs with bilaterally implanted intracranial electrodes...
November 26, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/29219528/cross-kerr-nonlinearity-for-phonon-counting
#3
Shiqian Ding, Gleb Maslennikov, Roland Hablützel, Dzmitry Matsukevich
State measurement of a quantum harmonic oscillator is essential in quantum optics and quantum information processing. In a system of trapped ions, we experimentally demonstrate the projective measurement of the state of the ions' motional mode via an effective cross-Kerr coupling to another motional mode. This coupling is induced by the intrinsic nonlinearity of the Coulomb interaction between the ions. We spectroscopically resolve the frequency shift of the motional sideband of the first mode due to the presence of single phonons in the second mode and use it to reconstruct the phonon number distribution of the second mode...
November 10, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29201135/measuring-coupling-of-rhythmical-time-series-using-cross-sample-entropy-and-cross-recurrence-quantification-analysis
#4
John McCamley, William Denton, Elizabeth Lyden, Jennifer M Yentes
The aim of this investigation was to compare and contrast the use of cross sample entropy (xSE) and cross recurrence quantification analysis (cRQA) measures for the assessment of coupling of rhythmical patterns. Measures were assessed using simulated signals with regular, chaotic, and random fluctuations in frequency, amplitude, and a combination of both. Biological data were studied as models of normal and abnormal locomotor-respiratory coupling. Nine signal types were generated for seven frequency ratios...
2017: Computational and Mathematical Methods in Medicine
https://www.readbyqxmd.com/read/29190972/development-of-estrogen-receptor-beta-binding-prediction-model-using-large-sets-of-chemicals
#5
Sugunadevi Sakkiah, Chandrabose Selvaraj, Ping Gong, Chaoyang Zhang, Weida Tong, Huixiao Hong
We developed an ERβ binding prediction model to facilitate identification of chemicals specifically bind ERβ or ERα together with our previously developed ERα binding model. Decision Forest was used to train ERβ binding prediction model based on a large set of compounds obtained from EADB. Model performance was estimated through 1000 iterations of 5-fold cross validations. Prediction confidence was analyzed using predictions from the cross validations. Informative chemical features for ERβ binding were identified through analysis of the frequency data of chemical descriptors used in the models in the 5-fold cross validations...
November 3, 2017: Oncotarget
https://www.readbyqxmd.com/read/29167341/novel-synthesis-and-phenotypic-analysis-of-mutant-clouds-for-hepatitis-e-virus-genotype-1
#6
Shubhra Agarwal, Prasith Baccam, Rakesh Aggarwal, Naga Suresh Veerapu
Many RNA viruses exist as an ensemble of genetically-diverse, replicating populations, known as mutant cloud. The genetic diversity (cloud size) and composition of this mutant cloud may influence several important phenotypic features of the virus, including its replication capacity. We applied a straightforward, bacterium-free approach using error-prone PCR coupled with reverse genetics to generate infectious mutant RNA clouds of varying genetic diversity from a genotype 1 strain of hepatitis E virus (HEV)...
November 22, 2017: Journal of Virology
https://www.readbyqxmd.com/read/29161352/delta-rhythm-orchestrates-the-neural-activity-underlying-the-resting-state-bold-signal-via-phase-amplitude-coupling
#7
Saul Jaime, Hong Gu, Brian F Sadacca, Elliot A Stein, Jose E Cavazos, Yihong Yang, Hanbing Lu
Spontaneous ongoing neuronal activity is a prominent feature of the mammalian brain. Temporal and spatial patterns of such ongoing activity have been exploited to examine large-scale brain network organization and function. However, the neurophysiological basis of this spontaneous brain activity as detected by resting-state functional Magnetic Resonance Imaging (fMRI) remains poorly understood. To this end, multi-site local field potentials (LFP) and blood oxygenation level-dependent (BOLD) fMRI were simultaneously recorded in the rat striatum along with local pharmacological manipulation of striatal activity...
November 17, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29154574/a-multivariate-dynamic-systems-model-for-psychotherapy-with-more-than-one-client
#8
Jonathan E Butner, Carlene Deits-Lebehn, Alexander O Crenshaw, Travis J Wiltshire, Nicholas S Perry, Robert G Kent de Grey, Jasara N Hogan, Timothy W Smith, Katherine J W Baucom, Brian R W Baucom
The dynamics of the give and take between therapist and client(s) is frequently of interest to therapy process researchers. Characterizing the ways that therapists respond to clients and clients respond to therapists can be challenging in therapeutic encounters involving a single therapist and a single client. The complexity of this challenge increases as the number of people involved in a therapeutic encounter increases not only because there are more people responding to one another but also because the patterns of responding can become more complex...
November 2017: Journal of Counseling Psychology
https://www.readbyqxmd.com/read/29146219/sexual-function-in-couples-with-or-without-female-incontinent-partners-correlates-and-predictors
#9
Renly Lim, Men Long Liong, Wing Seng Leong, Nurzalina Abdul Karim Khan, Kah Hay Yuen
OBJECTIVE: To evaluate the correlation between sexual function of couples with and without stress urinary incontinence (SUI) partners, and to identify predictors of poor sexual function. METHODS: A cross-sectional survey was conducted involving sexually active females with or without SUI aged at least 21 years old, and their respective partners. Both partners completed the Golombok Rust Inventory of Sexual Satisfaction (GRISS), a 28-item multidimensional measure with separate forms for male and female designed to assess sexual satisfaction of both partners...
November 13, 2017: Urology
https://www.readbyqxmd.com/read/29141439/double-cross-polarization-for-the-indirect-detection-of-nitrogen-14-nuclei-in-magic-angle-spinning-nmr-spectroscopy
#10
Diego Carnevale, Xiao Ji, Geoffrey Bodenhausen
Nitrogen-14 NMR spectra at fast magic-angle spinning rates can be acquired indirectly by means of two-dimensional techniques based on double cross polarization transfer (1)H → (14)N →(1)H. Experimental evidence is given for polycrystalline samples of glycine, l-histidine, and the dipeptide Ala-Gly. Either one-bond or long-range correlations can be favored by choosing the length of the cross polarization contact pulses. Longer contact pulses allow the detection of unprotonated nitrogen sites. In contrast to earlier methods that exploited second-order quadrupolar/dipolar cross-terms, cross polarization operates in the manner of the method of Hartmann and Hahn, even for (14)N quadrupolar couplings up to 4 MHz...
November 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29131954/ultrafast-wiggling-and-jiggling-ir2-1-8-diisocyanomenthane-4-2
#11
Martin Pizl, Bryan M Hunter, Gregory M Greetham, Michael Towrie, Stanislav Zalis, Harry B Gray, Antonin Vlcek
Binuclear complexes of d8 metals (PtII, IrI, RhI, ) exhibit diverse photonic behavior including dual emission from relatively long-lived singlet and triplet excited states, as well as photochemical energy-, electron-, and atom transfer. Time-resolved optical spectroscopic and X-ray studies have revealed the behavior of the dimetallic core, confirming that M-M bonding is strengthened upon d*p excitation. We report the bridging ligand dynamics of Ir2(1,8-diisocyanomenthane)42+ (Ir(dimen)), investigated by fs-ns time-resolved IR spectroscopy (TRIR) in the region of CN stretching vibrations, (CN), 2000-2300 cm-1...
November 13, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29097049/the-absence-of-resting-state-high-gamma-cross-frequency-coupling-in-patients-with-tinnitus
#12
Min-Hee Ahn, Sung Kwang Hong, Byoung-Kyong Min
Tinnitus is a psychoacoustic phantom perception of currently unknown neuropathology. Despite a growing number of post-stimulus tinnitus studies, uncertainty still exists regarding the neural signature of tinnitus in the resting-state brain. In the present study, we used high-gamma cross-frequency coupling and a Granger causality analysis to evaluate resting-state electroencephalographic (EEG) data in healthy participants and patients with tinnitus. Patients with tinnitus lacked robust frontal delta-phase/central high-gamma-amplitude coupling that was otherwise clearly observed in healthy participants...
October 30, 2017: Hearing Research
https://www.readbyqxmd.com/read/29092526/evaluation-of-low-frequency-operational-limit-of-proposed-iter-low-field-side-reflectometer-waveguide-run-including-miter-bends
#13
G Wang, W A Peebles, E J Doyle, N A Crocker, C Wannberg, C Lau, G R Hanson, J L Doane
The present design concept for the ITER low-field-side reflectometer transmission line (TL) consists of an ∼40 m long, 6.35 cm diameter helically corrugated waveguide (WG) together with ten 90° miter bends. This paper presents an evaluation of the TL performance at low frequencies (33-50 GHz) where the predicted HE11 mode ohmic and mode conversion losses start to increase significantly. Quasi-optical techniques were used to form a near Gaussian beam to efficiently couple radiation in this frequency range into the WG...
October 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29084088/intracochlear-measurements-of-interaural-time-and-level-differences-conveyed-by-bilateral-bone-conduction-systems
#14
Nyssa F Farrell, Renee M Banakis Hartl, Victor Benichoux, Andrew D Brown, Stephen P Cass, Daniel J Tollin
HYPOTHESIS: Intracochlear pressures (PIC) and stapes velocity (Vstap) elicited by bilaterally placed bone-anchored hearing devices (BAHD) will be systematically modulated by imposed interaural time (ITD) and level differences (ILD), demonstrating the potential for users of bilateral BAHD to access these binaural cues. BACKGROUND: BAHD are traditionally implanted unilaterally under the assumption that transcranial cross-talk limits interaural differences. Recent studies have demonstrated improvements in binaural and spatial performance with bilateral BAHD; however, objective measures of binaural cues from bilateral BAHDs are lacking...
December 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/29082205/sperm-dna-fragmentation-testing-a-cross-sectional-survey-on-current-practices-of-fertility-specialists
#15
Ahmad Majzoub, Ashok Agarwal, Chak-Lam Cho, Sandro C Esteves
BACKGROUND: Sperm DNA fragmentation (SDF) testing has been recognized as a valuable tool in the evaluation of infertile men. Despite that, its routine use in clinical practice is still hampered by the lack of understanding of the specific clinical scenarios where SDF testing is most beneficial. The aim of this study was to investigate fertility specialists evaluation of infertility of SDF testing in the context of male infertility evaluation and assisted reproductive technology. METHODS: A questionnaire was developed to survey the major aspects of SDF testing and was mailed to specialists with demonstrated clinical experience in the field of infertility...
September 2017: Translational Andrology and Urology
https://www.readbyqxmd.com/read/29079799/emergence-of-early-alterations-in-network-oscillations-and-functional-connectivity-in-a-tau-seeding-mouse-model-of-alzheimer-s-disease-pathology
#16
A Ahnaou, D Moechars, L Raeymaekers, R Biermans, N V Manyakov, A Bottelbergs, C Wintmolders, K Van Kolen, T Van De Casteele, J A Kemp, W H Drinkenburg
Synaptic dysfunction and disconnectivity are core deficits in Alzheimer's disease (AD), preceding clear changes in histopathology and cognitive functioning. Here, the early and late effects of tau pathology induction on functional network connectivity were investigated in P301L mice. Multichannel EEG oscillations were used to compute (1) coherent activity between the prefrontal cortex (PFC) and hippocampus (HPC) CA1-CA3 networks; (2) phase-amplitude cross frequency coupling (PAC) between theta and gamma oscillations, which is instrumental in adequate cognitive functioning; (3) information processing as assessed by auditory evoked potentials and oscillations in the passive oddball mismatch negativity-like (MMN) paradigm...
October 27, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29073734/near-field-three-dimensional-planar-millimeter-wave-holographic-imaging-by-using-frequency-scaling-algorithm
#17
Ye Zhang, Bin Deng, Qi Yang, Jingkun Gao, Yuliang Qin, Hongqiang Wang
In this paper, a fast three-dimensional (3-D) frequency scaling algorithm (FSA) with large depth of focus is presented for near-field planar millimeter-wave (MMW) holographic imaging. Considering the cross-range range coupling term which is neglected in the conventional range migration algorithm (RMA), we propose an algorithm performing the range cell migration correction for de-chirped signals without interpolation by using a 3-D frequency scaling operation. First, to deal with the cross-range range coupling term, a 3-D frequency scaling operator is derived to eliminate the space variation of range cell migration...
October 24, 2017: Sensors
https://www.readbyqxmd.com/read/29068659/interfacial-interactions-in-van-der-waals-heterostructures-of-mos2-and-graphene
#18
Hai Li, Jiang-Bin Wu, Feirong Ran, Miao-Ling Lin, Xue-Lu Liu, Yanyuan Zhao, Xin Lu, Qihua Xiong, Jun Zhang, Wei Huang, Hua Zhang, Ping-Heng Tan
Interfacial coupling between neighboring layers of van der Waals heterostructures (vdWHs), formed by vertically stacking more than two types of two-dimensional materials (2DMs), greatly affects their physical properties and device performance. Although high-resolution cross-sectional scanning tunneling electron microscopy can directly image the atomically sharp interfaces in the vdWHs, the interfacial coupling and lattice dynamics of vdWHs formed by two different types of 2DMs, such as semimetal and semiconductor, are not clear so far...
October 25, 2017: ACS Nano
https://www.readbyqxmd.com/read/29067311/mnemonic-strategy-training-of-the-elderly-at-risk-for-dementia-enhances-integration-of-information-processing-via-cross-frequency-coupling
#19
Stavros I Dimitriadis, Ioannis Tarnanas, Mark Wiederhold, Brenda Wiederhold, Magda Tsolaki, Elgar Fleisch
INTRODUCTION: We sought to identify whether intensive 10-week mobile health mnemonic strategy training (MST) could shift the resting-state brain network more toward cortical-level integration, which has recently been proven to reflect the reorganization of the brain networks compensating the cognitive decline. METHODS: One hundred fifty-eight patients with mild cognitive impairment (MCI) were selected and participated in 10-week training lasting 90 min/d of memory training...
November 2016: Alzheimer's & Dementia: Translational Research & Clinical Interventions
https://www.readbyqxmd.com/read/29064454/near-field-three-dimensional-planar-millimeter-wave-holographic-imaging-by-using-frequency-scaling-algorithm
#20
Ye Zhang, Bin Deng, Qi Yang, Jingkun Gao, Yuliang Qin, Hongqiang Wang
In this paper, a fast three-dimensional (3-D) frequency scaling algorithm (FSA) with large depth of focus is presented for near-field planar millimeter-wave (MMW) holographic imaging. Considering the cross-range range coupling term which is neglected in the conventional range migration algorithm (RMA), we propose an algorithm performing the range cell migration correction for de-chirped signals without interpolation by using a 3-D frequency scaling operation. First, to deal with the cross-range range coupling term, a 3-D frequency scaling operator is derived to eliminate the space variation of range cell migration...
October 24, 2017: Sensors
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