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Cross frequency coupling

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https://www.readbyqxmd.com/read/29445903/movement-kinematics-dynamically-modulates-the-rolandic-20-hz-rhythm-during-goal-directed-executed-and-observed-hand-actions
#1
B Marty, M Bourguignon, V Jousmäki, V Wens, S Goldman, X De Tiège
This study investigates whether movement kinematics modulates similarly the rolandic α and β rhythm amplitude during executed and observed goal-directed hand movements. It also assesses if this modulation relates to the corticokinematic coherence (CKC), which is the coupling observed between cortical activity and movement kinematics during such motor actions. Magnetoencephalography (MEG) signals were recorded from 11 right-handed healthy subjects while they performed or observed an actor performing the same repetitive hand pinching action...
February 14, 2018: Brain Topography
https://www.readbyqxmd.com/read/29433404/the-characteristics-of-hypoactive-sexual-desire-disorder-in-korean-women-who-visited-a-community-based-gynaecology-hospital-for-sexual-dysfunction
#2
Ho Ju Yun, Hyun Hee Cho
This cross-sectional study analysed the characteristics of HSDD (hypoactive sexual desire disorder) in Korean women. Two hundred and seventeen women seen for sexual dysfunction were assessed using the Diagnostic and Statistical Manual of Mental Disorders, Fourth Edition, Revised (DMS IV-TR) and the Female Sexual Function Index (FSFI). A diagnosis of HSDD was more common in women in their 40 s (56%), who had previously undergone surgery for a feeling of 'wide vagina'. Both too much or too little sexual activity caused HSDD...
February 12, 2018: Journal of Obstetrics and Gynaecology: the Journal of the Institute of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/29429805/respiration-entrained-brain-rhythms-are-global-but-often-overlooked
#3
REVIEW
Adriano B L Tort, Jurij Brankačk, Andreas Draguhn
We revisit recent evidence showing that nasal respiration entrains oscillations at the same frequency as breathing in several regions of the rodent brain. Moreover, respiration modulates the amplitude of a specific gamma sub-band (70-120Hz), most prominently in frontal regions. Since rodents often breathe at delta and theta frequencies, we caution that previous studies on delta and theta power and their cross-regional synchrony, as well as on delta-gamma and theta-gamma coupling, may have detected the respiration-entrained rhythm and respiration-gamma coupling...
February 8, 2018: Trends in Neurosciences
https://www.readbyqxmd.com/read/29423443/demonstration-of-universal-parametric-entangling-gates-on-a-multi-qubit-lattice
#4
Matthew Reagor, Christopher B Osborn, Nikolas Tezak, Alexa Staley, Guenevere Prawiroatmodjo, Michael Scheer, Nasser Alidoust, Eyob A Sete, Nicolas Didier, Marcus P da Silva, Ezer Acala, Joel Angeles, Andrew Bestwick, Maxwell Block, Benjamin Bloom, Adam Bradley, Catvu Bui, Shane Caldwell, Lauren Capelluto, Rick Chilcott, Jeff Cordova, Genya Crossman, Michael Curtis, Saniya Deshpande, Tristan El Bouayadi, Daniel Girshovich, Sabrina Hong, Alex Hudson, Peter Karalekas, Kat Kuang, Michael Lenihan, Riccardo Manenti, Thomas Manning, Jayss Marshall, Yuvraj Mohan, William O'Brien, Johannes Otterbach, Alexander Papageorge, Jean-Philip Paquette, Michael Pelstring, Anthony Polloreno, Vijay Rawat, Colm A Ryan, Russ Renzas, Nick Rubin, Damon Russel, Michael Rust, Diego Scarabelli, Michael Selvanayagam, Rodney Sinclair, Robert Smith, Mark Suska, Ting-Wai To, Mehrnoosh Vahidpour, Nagesh Vodrahalli, Tyler Whyland, Kamal Yadav, William Zeng, Chad T Rigetti
We show that parametric coupling techniques can be used to generate selective entangling interactions for multi-qubit processors. By inducing coherent population exchange between adjacent qubits under frequency modulation, we implement a universal gate set for a linear array of four superconducting qubits. An average process fidelity of ℱ = 93% is estimated for three two-qubit gates via quantum process tomography. We establish the suitability of these techniques for computation by preparing a four-qubit maximally entangled state and comparing the estimated state fidelity with the expected performance of the individual entangling gates...
February 2018: Science Advances
https://www.readbyqxmd.com/read/29422912/a-new-mechanistic-model-for-viral-cross-protection-and-superinfection-exclusion
#5
REVIEW
Xiao-Feng Zhang, Shaoyan Zhang, Qin Guo, Rong Sun, Taiyun Wei, Feng Qu
Plants pre-infected with a mild variant of a virus frequently become protected against more severe variants of the same virus through the cross protection phenomenon first discovered in 1929. Despite its widespread use in managing important plant virus diseases, the mechanism of cross protection remains poorly understood. Recent investigations in our labs, by analyzing the whole-plant dynamics of a turnip crinkle virus (TCV) population, coupled with cell biological interrogation of individual TCV variants, revealed possible novel mechanisms for cross protection and the closely related process of superinfection exclusion (SIE)...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29421325/localizing-bicoherence-from-eeg-and-meg
#6
Forooz Shahbazi Avarvand, Sarah Bartz, Christina Andreou, Wojciech Samek, Gregor Leicht, Christoph Mulert, Andreas K Engel, Guido Nolte
We propose a new method for the localization of nonlinear cross-frequency coupling in EEG and MEG data analysis, based on the estimation of bicoherences at the source level. While for the analysis of rhythmic brain activity, source directions are commonly chosen to maximize power, we suggest to maximize bicoherence instead. The resulting nonlinear cost function can be minimized effectively using a gradient approach. We argue, that bicoherence is also a generally useful tool to analyze phase-amplitude coupling (PAC), by deriving formal relations between PAC and bispectra...
February 5, 2018: NeuroImage
https://www.readbyqxmd.com/read/29402047/impact-of-modulation-bandwidth-on-multiplexing-using-principal-modes-in-mmf-links
#7
Rohan Prasad, Kumar Appaiah
Multimode fibers (MMFs) are widely used for short fiber links. However, the data rates through MMFs is limited owing to modal dispersion. The so-called "principal modes" (PMs) permit transmission and multiplexing through the MMFs without modal dispersion for small modulation bandwidths. For larger modulation bandwidths, however, they lose their dispersion-free nature. In this paper, we model the impact of modulation bandwidth and mode coupling strength on the performance of PMs. We develop a simulator that characterizes the dispersion and cross-talk of the PMs of few-mode and large-core graded-index MMFs with mode-dependent losses (MDL)...
January 22, 2018: Optics Express
https://www.readbyqxmd.com/read/29397081/phase-amplitude-coupling-of-the-electroencephalogram-in-the-auditory-cortex-in-schizophrenia
#8
Shogo Hirano, Alexander Nakhnikian, Yoji Hirano, Naoya Oribe, Shigenobu Kanba, Toshiaki Onitsuka, Margaret Levin, Kevin M Spencer
BACKGROUND: Cross-frequency interactions may coordinate neural circuits operating at different frequencies. While neural oscillations associated with particular circuits in schizophrenia (SZ) are impaired, few studies have examined cross-frequency interactions. Here we examined phase-amplitude coupling (PAC) in the electroencephalograms of individuals with SZ and healthy control subjects (HCs). We computed PAC during the baseline period of 40-Hz auditory steady-state stimulation and rest...
January 2018: Biological Psychiatry: Cognitive Neuroscience and Neuroimaging
https://www.readbyqxmd.com/read/29359413/effects-of-chronic-ketamine-on-hippocampal-cross-frequency-coupling-implications-for-schizophrenia-pathophysiology
#9
Timothy I Michaels, Lauren L Long, Ian H Stevenson, James J Chrobak, Chi-Ming A Chen
Disrupted neuronal oscillations have been identified as a potentially important biomarker for the perceptual and cognitive symptoms of schizophrenia. Emerging evidences suggest that interactions between different frequency bands, cross-frequency coupling (CFC), serve an important role in integrating sensory and cognitive information and may contribute to disease pathophysiology. In the present study, we investigated the effects of 14-day consecutive administration of ketamine (30 mg/kg i.p.) versus saline on alterations in amplitude and changes in the coupling of low-frequency (0-30 Hz) phase and high-frequency (30-115 Hz) amplitude in the CA1 hippocampus of Long Evans rats...
January 23, 2018: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29357461/phase-amplitude-coupling-within-the-anterior-thalamic-nuclei-during-seizures
#10
George M Ibrahim, Simeon Wong, Benjamin R Morgan, Nir Lipsman, Aria Fallah, Alexander G Weil, Vibhor Krishna, Richard A Wennberg, Andres A Lozano
Cross-frequency phase-amplitude coupling (cfPAC) subserves an integral role in the hierarchical organization of inter-regional neuronal communication, and is also expressed by epileptogenic cortex during seizures. Here, we sought to characterize patterns of cfPAC expression in the anterior thalamic nuclei during seizures by studying extra-operative recordings in patients implanted with deep brain stimulation electrodes for intractable epilepsy. Nine seizures from 2 patients were analyzed in the peri-ictal period...
December 27, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29357455/non-sinusoidal-neuronal-oscillations-bug-or-feature
#11
Diego Lozano-Soldevilla
There is compiling evidence suggesting that independent neuronal ensembles are coordinated in time and space through cross-frequency coupling (CFC). However, recent studies have convincingly demonstrated that non-sinusoidal oscillations produce serious biases in state of the art CFC metrics. Although most of studies treat non-sinusoidal waves as a nuisance or just ignore them, fortunately, some scientists are starting to exploit their neurophysiological relevance opening new research vistas with critical implications...
January 3, 2018: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29347784/parametric-pulse-amplification-by-acoustic-quasimodes-in-electron-positron-plasma
#12
F Schluck, G Lehmann, K H Spatschek
In a recent paper, M. R. Edwards, N. J. Fisch, and J. M. Mikhailova [Phys. Rev. Lett. 116, 015004 (2016)PRLTAO0031-900710.1103/PhysRevLett.116.015004] reported that in electron-positron plasma stimulated Brillouin scattering is drastically enhanced, while stimulated Raman scattering is completely absent. However, when theory was compared to particle-in-cell (PIC) simulations, a discrepancy by at least a factor four appeared. Authors correctly argued that the disparity might be due to the fluid approximation of the low-frequency mode...
November 2017: Physical Review. E
https://www.readbyqxmd.com/read/29341320/spatiotemporal-metabolic-and-therapeutic-characterization-of-altered-functional-connectivity-in-major-depressive-disorder
#13
Jintao Sheng, Yuedi Shen, Yanhua Qin, Lei Zhang, Binjia Jiang, Yaoyao Li, Luoyi Xu, Wei Chen, Jinhui Wang
Although imbalanced functional integration has been increasingly reported in major depressive disorder (MDD), there still lacks a general framework to characterize common characteristic and origin shared by the integrative disturbances. Here we examined spatial selectivity, temporal uniqueness, metabolic basis, and therapeutic response of altered functional connectivity (FC) in MDD by analyzing both cross-sectional and longitudinal multimodal functional magnetic resonance imaging data from 35 patients and 34 demographically matched healthy controls...
January 17, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29339052/neurophysiological-effects-in-cortico-basal-ganglia-thalamic-circuits-of-antidyskinetic-treatment-with-5-ht1a-receptor-biased-agonists
#14
Ivani Brys, Pär Halje, Robson Scheffer-Teixeira, Mark Varney, Adrian Newman-Tancredi, Per Petersson
Recently, the biased and highly selective 5-HT1A agonists, NLX-112, F13714 and F15599, have been shown to alleviate dyskinesia in rodent and primate models of Parkinson's disease, while marginally interfering with antiparkinsonian effects of levodopa. To provide more detailed information on the processes underlying the alleviation of dyskinesia, we have here investigated changes in the spectral contents of local field potentials in cortico-basal ganglia-thalamic circuits following treatment with this novel group of 5-HT1A agonists or the prototypical agonist, 8-OH-DPAT...
January 13, 2018: Experimental Neurology
https://www.readbyqxmd.com/read/29337999/a-dynamical-systems-approach-for-estimating-phase-interactions-between-rhythms-of-different-frequencies-from-experimental-data
#15
Takayuki Onojima, Takahiro Goto, Hiroaki Mizuhara, Toshio Aoyagi
Synchronization of neural oscillations as a mechanism of brain function is attracting increasing attention. Neural oscillation is a rhythmic neural activity that can be easily observed by noninvasive electroencephalography (EEG). Neural oscillations show the same frequency and cross-frequency synchronization for various cognitive and perceptual functions. However, it is unclear how this neural synchronization is achieved by a dynamical system. If neural oscillations are weakly coupled oscillators, the dynamics of neural synchronization can be described theoretically using a phase oscillator model...
January 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29335654/microwave-squid-multiplexer-demonstration-for-cosmic-microwave-background-imagers
#16
B Dober, D T Becker, D A Bennett, S A Bryan, S M Duff, J D Gard, J P Hays-Wehle, G C Hilton, J Hubmayr, J A B Mates, C D Reintsema, L R Vale, J N Ullom
Key performance characteristics are demonstrated for the microwave SQUID multiplexer (µmux) coupled to transition edge sensor (TES) bolometers that have been optimized for cosmic microwave background (CMB) observations. In a 64-channel demonstration, we show that the µmux produces a white, input referred current noise level of [Formula: see text] at -77 dB microwave probe tone power, which is well below expected fundamental detector and photon noise sources for a ground-based CMB-optimized bolometer. Operated with negligible photon loading, we measure [Formula: see text] in the TES-coupled channels biased at 65% of the sensor normal resistance...
December 2017: Applied Physics Letters
https://www.readbyqxmd.com/read/29317186/perturbation-of-theta-gamma-coupling-at-the-temporal-lobe-hinders-verbal-declarative-memory
#17
Gabriel Amador de Lara, Ivan Alekseichuk, Zsolt Turi, Albert Lehr, Andrea Antal, Walter Paulus
BACKGROUND: Phase-amplitude cross-frequency coupling (PAC) is characterized by the modulation of the power of a fast brain oscillation (e.g., gamma) by the phase of a slow rhythm (e.g., theta). PAC in different sub- and neocortical regions is known to underlie effective neural communication and correlates with successful long-term memory formation. OBJECTIVE/HYPOTHESIS: The present work aims to extend earlier observational data, by probing the functional role of theta-gamma PAC in the left temporal cortex in humans during verbal long-term memory encoding...
December 25, 2017: Brain Stimulation
https://www.readbyqxmd.com/read/29314358/detection-of-indistinct-fe-n-stretching-bands-in-iron-v-nitrides-by-photodissociation-spectroscopy
#18
Erik Andris, Rafael Navrátil, Juraj Jašík, Gerard Sabenya, Miquel Costas, Martin Srnec, Jana Roithová
We report for the first time infrared spectra of three non-heme pseudo-octahedral iron(V) nitride complexes with assigned Fe-N stretching vibrations. The intensities of the Fe-N bands in two of the complexes are extremely weak. Their detection was enabled by the high resolution and sensitivity of the experiments performed at 3 K for isolated complexes in the gas phase. Multireference CASPT2 calculations revealed that the Fe-N bond in the ground doublet state is influenced by two low-lying excited doublet states...
January 3, 2018: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29307313/associations-between-alcohol-and-obesity-in-more-than-100-000-adults-in-england-and-scotland
#19
Gary O'Donovan, Emmanuel Stamatakis, Mark Hamer
The objective of this cross-sectional study was to clarify the association between alcohol and obesity using data from 106 182 adults in England and Scotland (46·7 % male; mean 46·9 (sd 16·9) years). Trained interviewers asked participants about alcohol intake. Obesity was defined as BMI≥30 kg/m2. Potential confounders included age, sex, smoking, physical activity, longstanding illness, psychological distress and socioeconomic status. Compared with those who drank at least five times a week, obesity risk was 1·21 (95 % CI 1·15, 1·27) in those who drank one to four times a week, 1·53 (95 % CI 1·43, 1·62) in those who drank one to two times a month, 1·61 (95 % CI 1·52, 1·71) in those who drank less than once every couple of months, 1·34 (95 % CI 1·23, 1·47) in those who were former drinkers, and 1·03 (95 % CI 0·95, 1·11) in those who were never drinkers...
January 8, 2018: British Journal of Nutrition
https://www.readbyqxmd.com/read/29297954/palladium-loaded-cucurbit-7-uril-modified-iron-oxide-nanoparticles-for-c-c-cross-coupling-reactions
#20
Erwann Guenin, Farah Benyettou Benyettou, Hassan Traboulsi, Laurence Motte Motte, Javed Mazer, Renu Pasricha Pasricha, John-Carl Olsen Olsen, Ali Trabolsi
Cucurbit[7]uril modified iron oxide nanoparticles (CB[7]NPs) were loaded with palladium to form nano-catalysts (Pd@CB[7]NPs) that, with microwave heating, catalysed Suzuki-Miyaura, Sonogashira, and Mizoroki-Heck cross coupling reactions. All reactions were run in environmentally benign 1/1 ethanol/water solvent under convenient aerobic conditions. In a preliminary screening, all conversions and yields were uniformly high with turn over frequencies (TOF) ranging from 64 to 7360 h-1. The nano-catalysts could be recovered with a magnet and reused several times (6 times for Suzuki Miayura reaction) without loss of activity...
January 3, 2018: Chemistry: a European Journal
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