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Cross-frequency coupling

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https://www.readbyqxmd.com/read/28230793/dynamic-fluid-in-a-porous-transducer-based-angular-accelerometer
#1
Siyuan Cheng, Mengyin Fu, Meiling Wang, Li Ming, Huijin Fu, Tonglei Wang
This paper presents a theoretical model of the dynamics of liquid flow in an angular accelerometer comprising a porous transducer in a circular tube of liquid. Wave speed and dynamic permeability of the transducer are considered to describe the relation between angular acceleration and the differential pressure on the transducer. The permeability and streaming potential coupling coefficient of the transducer are determined in the experiments, and special prototypes are utilized to validate the theoretical model in both the frequency and time domains...
February 21, 2017: Sensors
https://www.readbyqxmd.com/read/28227760/cross-frequency-coupling-during-auditory-perception-in-human-cortex
#2
Urszula Malinowska, Dana Boatman-Reich, Urszula Malinowska, Dana Boatman-Reich, Urszula Malinowska, Dana Boatman-Reich
Cross-frequency coupling plays an important role in coordinating neuronal computations underlying human perception, learning and memory. Here we compared four methods for measuring phase/amplitude coupling (PAC) of theta (4-7 Hz) and high-gamma (70-150 Hz) in intracranial electrocorticographic (ECoG) recordings. Time-frequency spectral and time-domain evoked responses were derived for comparison. All four methods showed significant increases in theta/high-gamma PAC in auditory cortex at sites where significant event-related increases in high-gamma power were also observed...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227759/mining-cross-frequency-coupling-microstates-cfc%C3%AE-states-from-eeg-recordings-during-resting-state-and-mental-arithmetic-tasks
#3
Stavros I Dimitriadis, Yu Sun, Nitish Thakor, Anastasios Bezerianos, Stavros I Dimitriadis, Yu Sun, Nitish Thakor, Anastasios Bezerianos, Stavros I Dimitriadis, Yu Sun, Nitish Thakor, Anastasios Bezerianos
The functional brain connectivity has been studied by analyzing synchronization between dynamic oscillations of identical frequency or between different frequencies of distinct brain areas. It has been hypothesized that cross-frequency coupling (CFC) between different frequency bands is the carrier mechanism for the coordination of global and local neural processes and hence supports the distributed information processing in the brain. In the present study, we attempt to study the dynamic evolution of CFC at resting-state and during a mental task...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227758/mining-cross-frequency-coupling-microstates-from-resting-state-meg-an-application-to-mild-traumatic-brain-injury
#4
Marios Antonakakis, Stavros I Dimitriadis, Michalis Zervakis, Andrew C Papanicolaou, George Zouridakis, Marios Antonakakis, Stavros I Dimitriadis, Michalis Zervakis, Andrew C Papanicolaou, George Zouridakis, Michalis Zervakis, Marios Antonakakis, George Zouridakis, Andrew C Papanicolaou, Stavros I Dimitriadis
Recent studies have investigated the possible role of dynamic functional connectivity and the role of cross-frequency coupling (CFC) to provide the substrate for reliable biomarkers of brain disorders. In this study, we analyzed time-varying CFC profiles from resting state Magnetoencephal-ographic recordings of 30 mild Traumatic Brain Injury (mTBI) patients and 50 normal controls. Interactions among sensors at specific pairs of frequency bands were computed via estimation of phase-to-amplitude couplings. We then computed time-varying functional connectivity graphs that were described in terms of segregation (local efficiency, LE) and integration (global efficiency, GE) and mapped those graphs to time series of GE/LE estimates...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227757/feasibility-study-for-the-assessment-of-cardio-respiratory-coupling-in-newborn-infants
#5
Maristella Lucchini, William P Fifer, Manuela Ferrario, Maria G Signorini, Maristella Lucchini, William P Fifer, Manuela Ferrario, Maria G Signorini, Maristella Lucchini, Maria G Signorini, William P Fifer, Manuela Ferrario
Cardio Respiratory Coupling (CRC) plays a key role during infant development. Nonetheless, mechanisms underlying it are still mostly unexplained and tools to assess it are often inadequate to understand its functioning. This study aims to evaluate the feasibility of CRC activity detection and quantification analyzing ECG and respiration of newborn healthy subjects. Cross-spectral analysis (coherence) and a novel application of a nonlinear method (Bivariate Phase Rectified Signal Averaging) were applied on 10 minutes recording from 4 subjects...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227191/application-of-independent-component-analysis-to-remove-linear-dependencies-in-eeg-recorded-in-hippocampus
#6
J Harry Blaise, Taikang Ning, J Harry Blaise, Taikang Ning, Taikang Ning
Linear cross-spectral and nonlinear cross-bispectral analysis techniques were applied to EEG data recorded simultaneously in two subfields (CA1 and dentate gyrus) of the hippocampus in freely behaving neonatal rats during REM sleep. Linear dependencies between the two sites were specifically removed using independent component analysis (ICA). The cross-spectrum and the cross-bispectrum computed prior to ICA processing were compared with those after ICA processing to determine its effects. Our results indicate that ICA almost completely extracts the linear relationship in the theta frequency band between CA1 and the dentate gyrus...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225908/intimate-partner-violence-reported-by-female-and-male-users-of-healthcare-units
#7
Claudia Renata Dos Santos Barros, Lilia Blima Schraiber
OBJECTIVE: To analyze nonfatal violence suffered and committed by adult men and women, in an intimate relationship. METHODS: The participants in the research were women aged between 15 and 49 years and men between 18 and 60 years, interviewed by face-to-face questionnaire application. The sample selection was of consecutive type, according to the order of arrival of the users. We conducted temporarily independent investigations and covered different health services to avoid couples and relationships in which the retaliation could be overvalued...
February 16, 2017: Revista de Saúde Pública
https://www.readbyqxmd.com/read/28224790/ph-dependent-photodeprotection-of-formaldehyde-homolytic-c-c-scission-in-acidic-aqueous-solution-versus-heterolytic-c-c-scission-in-basic-aqueous-solution
#8
Mingyue Liu, Wenjian Tang, Ming-De Li, David Lee Phillips
The photodeprotection of formaldehyde was investigated for 3-(1-hydroxypropan-2-yl)benzophenone (3-HPBP) with ultrafast time-resolved spectroscopy. The femtosecond transient absorption results indicated the singlet excited state of 3-HPBP transformed efficiently into its triplet state by a fast intersystem crossing. In acidic (pH=0) and basic (pH=12.5) aqueous solutions, the triplet intermediate was a key precursor for the deprotection of formaldehyde via two different pathways. However little photodeprotection was observed in neutral (pH=7) aqueous solution where the triplet intermediate appeared to undergo a proton coupled electron transfer process to form a ketyl radical transient...
February 22, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28214134/intensification-of-heterogeneously-catalyzed-suzuki-miyaura-cross-coupling-reaction-using-ultrasound-understanding-effect-of-operating-parameters
#9
Sonam V Sancheti, Parag R Gogate
Palladium-catalyzed Suzuki-Miyaura cross-coupling reaction is a significant reaction for obtaining industrially important products. The current research work deals with intensification of reaction of 4-bromoanisole and phenylboronic acid catalyzed with 5wt% Pd/C (5% by weight Pd supported on C available as commercial catalyst) using ultrasound and more importantly, without use of any additional phase transfer catalyst. Heterogeneous catalyst has been selected in the present work so as to harness the benefits of easy separation and the possible limitations of heterogeneous operation are minimized by introducing ultrasonic irradiations...
January 27, 2017: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/28212282/collagen-gold-nanoparticle-conjugates-for-versatile-biosensing
#10
Sarah Unser, Samuel Holcomb, ReJeana Cary, Laura Sagle
Integration of noble metal nanoparticles with proteins offers promising potential to create a wide variety of biosensors that possess both improved selectivity and versatility. The multitude of functionalities that proteins offer coupled with the unique optical properties of noble metal nanoparticles can allow for the realization of simple, colorimetric sensors for a significantly larger range of targets. Herein, we integrate the structural protein collagen with 10 nm gold nanoparticles to develop a protein-nanoparticle conjugate which possess the functionality of the protein with the desired colorimetric properties of the nanoparticles...
February 15, 2017: Sensors
https://www.readbyqxmd.com/read/28179476/disharmony-in-neural-oscillations
#11
Alexandre Hyafil
Cross-frequency phase coupling (PPC) may play an important role in neural processing and cognition. However, a new study unveils a statistical bias in how PPC is detected in neural recordings, questions prior evidence for PPC in hippocampus, and shows PPC tests are dramatically flawed by their confounds with oscillation harmonics.
February 8, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28169319/early-life-stress-impairs-recognition-memory-and-perturbs-the-functional-maturation-of-prefrontal-hippocampal-perirhinal-networks
#12
Samuel A J Reincke, Ileana L Hanganu-Opatz
Early life exposure to stressful situations impairs cognitive performance of adults and contributes to the etiology of several psychiatric disorders. Most of affected cognitive abilities rely on coupling by synchrony within complex neuronal networks, including prefrontal cortex (PFC), hippocampus (HP), and perirhinal cortex (PRH). Yet it remains poorly understood how early life stress (ELS) induces dysfunction within these networks during the course of development. Here we used intermittent maternal separation during the first 2 postnatal weeks to mimic ELS and monitored the recognition memory and functional coupling within prefrontal-hippocampal-perirhinal circuits in juvenile rats...
February 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28169281/gating-of-memory-encoding-of-time-delayed-cross-frequency-meg-networks-revealed-by-graph-filtration-based-on-persistent-homology
#13
Jarang Hahm, Hyekyoung Lee, Hyojin Park, Eunjoo Kang, Yu Kyeong Kim, Chun Kee Chung, Hyejin Kang, Dong Soo Lee
To explain gating of memory encoding, magnetoencephalography (MEG) was analyzed over multi-regional network of negative correlations between alpha band power during cue (cue-alpha) and gamma band power during item presentation (item-gamma) in Remember (R) and No-remember (NR) condition. Persistent homology with graph filtration on alpha-gamma correlation disclosed topological invariants to explain memory gating. Instruction compliance (R-hits minus NR-hits) was significantly related to negative coupling between the left superior occipital (cue-alpha) and the left dorsolateral superior frontal gyri (item-gamma) on permutation test, where the coupling was stronger in R than NR...
February 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28167348/3d-functional-ultrasound-imaging-of-the-cerebral-visual-system-in-rodents
#14
Marc Gesnik, Kevin Blaize, Thomas Deffieux, Jean-Luc Gennisson, José-Alain Sahel, Mathias Fink, Serge Picaud, Mickaël Tanter
3D functional imaging of the whole brain activity during visual task is a challenging task in rodents due to the complex tri-dimensional shape of involved brain regions and the fine spatial and temporal resolutions required to reveal the visual tract. By coupling functional ultrasound (fUS) imaging with a translational motorized stage and an episodic visual stimulation device, we managed to accurately map and to recover the activity of the visual cortices, the Superior Colliculus (SC) and the Lateral Geniculate Nuclei (LGN) in 3D...
February 3, 2017: NeuroImage
https://www.readbyqxmd.com/read/28158000/coupled-mode-theory-and-fano-resonances-in-guided-mode-resonant-gratings-the-conical-diffraction-mounting
#15
Dmitry A Bykov, Leonid L Doskolovich, Victor A Soifer
We study resonances of guided-mode resonant gratings in conical mounting. By developing 2D time-dependent coupled-mode theory we obtain simple approximations of the transmission and reflection coefficients. Being functions of the incident light's frequency and in-plane wave vector components, the obtained approximations can be considered as multi-variable generalizations of the Fano line shape. We show that the approximations are in good agreement with the rigorously calculated transmission and reflection spectra...
January 23, 2017: Optics Express
https://www.readbyqxmd.com/read/28134329/mode-coupling-and-nonlinear-resonances-of-mems-arch-resonators-for-bandpass-filters
#16
Amal Z Hajjaj, Md Abdullah Hafiz, Mohammad I Younis
We experimentally demonstrate an exploitation of the nonlinear softening, hardening, and veering phenomena (near crossing), where the frequencies of two vibration modes get close to each other, to realize a bandpass filter of sharp roll off from the passband to the stopband. The concept is demonstrated based on an electrothermally tuned and electrostatically driven MEMS arch resonator operated in air. The in-plane resonator is fabricated from a silicon-on-insulator wafer with a deliberate curvature to form an arch shape...
January 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28128920/steering-asymmetric-lewis-acid-catalysis-exclusively-with-octahedral-metal-centered-chirality
#17
Lilu Zhang, Eric Meggers
Catalysts for asymmetric synthesis must be chiral. Metal-based asymmetric catalysts are typically constructed by assembling chiral ligands around a central metal. In this Account, a new class of effective chiral Lewis acid catalysts is introduced in which the octahedral metal center constitutes the exclusive source of chirality. Specifically, the here discussed class of catalysts are composed of configurationally stable, chiral-at-metal Λ-configured (left-handed propeller) or Δ-configured (right-handed propeller) iridium(III) or rhodium(III) complexes containing two bidentate cyclometalating 5-tert-butyl-2-phenylbenzoxazole (dubbed IrO and RhO) or 5-tert-butyl-2-phenylbenzothiazole (dubbed IrS and RhS) ligands in addition to two exchange-labile acetonitriles...
January 27, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28126107/boundary-crossing-in-first-marriage-and-remarriage
#18
Kate H Choi, Marta Tienda
Owing to secular increases in divorce rates, remarriage has become a prevalent feature of American family life; yet, research about mate selection behavior in higher order marriages remains limited. Using log-linear methods to recent data from the 2008-2014 American Community Survey, we compare racial and ethnic sorting behavior in first and subsequent marriages. The two most frequently crossed boundaries - those involving White-Asian and White-Hispanic couples - are more permeable in remarriages than in first marriages...
February 2017: Social Science Research
https://www.readbyqxmd.com/read/28117662/multivariate-cross-frequency-coupling-via-generalized-eigendecomposition
#19
Michael X Cohen
This paper presents a new framework for analyzing cross-frequency coupling in multichannel electrophysiological recordings. The generalized eigendecomposition-based cross-frequency coupling framework (gedCFC) is inspired by source-separation algorithms combined with dynamics of mesoscopic neurophysiological processes. It is unaffected by factors that confound traditional CFC methods-such as non-stationarities, non-sinusoidality, and non-uniform phase angle distributions-attractive properties considering that brain activity is neither stationary nor perfectly sinusoidal...
January 24, 2017: ELife
https://www.readbyqxmd.com/read/28113472/a-spatially-focused-method-for-high-density-electrode-based-functional-brain-mapping-applications
#20
Chih-Wei Chang, Yue-Loong Hsin, Wentai Liu
Mapping the electric field of the brain with electrodes benefits from its superior temporal resolution but is prone to low spatial resolution property comparing with other modalities such as fMRI, which can directly impact the precision of clinical diagnosis. Simulations show that dense arrays with straightforwardly miniaturized electrodes in terms of size and pitch may not improve the spatial resolution but only strengthen the cross coupling between adjacent channels due to volume conduction. We present a new spatially focused method to improve the electrode spatial selectivity and consequently suppress the neural signal coupling from the sources in the vicinity...
March 7, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
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