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Cross frequency coupling

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https://www.readbyqxmd.com/read/27919297/fluid-intelligence-and-the-cross-frequency-coupling-of-neuronal-oscillations
#1
Adam Chuderski
Several existing theoretical models predict that the individual capacity of working memory and abstract reasoning (fluid intelligence) strongly depends on certain features of neuronal oscillations, especially their cross-frequency coupling. Empirical evidence supporting these predictions is still scarce, but it makes the future studies on oscillatory coupling a promising line of research that can uncover the physiological underpinnings of fluid intelligence. Cross-frequency coupling may serve as the optimal level of description of neurocognitive processes, integrating their genetic, structural, neurochemical, and bioelectrical underlying factors with explanations in terms of cognitive operations driven by neuronal oscillations...
December 6, 2016: Spanish Journal of Psychology
https://www.readbyqxmd.com/read/27915179/axially-uniform-magnetic-field-modulation-excitation-for-electron-paramagnetic-resonance-in-rectangular-and-cylindrical-cavities-by-slot-cutting
#2
Jason W Sidabras, James E Richie, James S Hyde
In continuous-wave (CW) Electron Paramagnetic Resonance (EPR) a low-frequency time-harmonic magnetic field, called field modulation, is applied parallel to the static magnetic field and incident on the sample. Varying amplitude of the field modulation incident on the sample has consequences on spectral line-shape and line-height over the axis of the sample. Here we present a method of coupling magnetic field into the cavity using slots perpendicular to the sample axis where the slot depths are designed in such a way to produce an axially uniform magnetic field along the sample...
November 25, 2016: Journal of Magnetic Resonance
https://www.readbyqxmd.com/read/27903706/phase-amplitude-coupling-and-long-range-phase-synchronization-reveal-frontotemporal-interactions-during-visual-working-memory
#3
Jonathan Daume, Thomas Gruber, Andreas K Engel, Uwe Friese
: It has been suggested that cross-frequency phase-amplitude coupling (PAC) particularly in temporal brain structures serves as a neural mechanism for coordinated working memory storage. In this magnetoencephalography study, we show that during visual working memory maintenance, temporal cortex regions, which exhibit enhanced PAC, interact with prefrontal cortex via enhanced low-frequency phase synchronization. Healthy human participants were engaged in a visual delayed-matching-to-sample task with pictures of natural objects...
November 30, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27900948/prediction-of-antiepileptic-drug-treatment-outcomes-using-machine-learning
#4
Sinisa Colic, Robert G Wither, Min Lang, Liang Zhang, James H Eubanks, Berj L Bardakjian
OBJECTIVE: Antiepileptic drug (AED) treatments produce inconsistent outcomes, often necessitating patients to go through several drug trials until a successful treatment can be found. This study proposes the use of machine learning techniques to predict epilepsy treatment outcomes of commonly used AEDs. APPROACH: Machine learning algorithms were trained and evaluated using features obtained from intracranial electroencephalogram (iEEG) recordings of the epileptiform discharges observed in Mecp2-deficient mouse model of the Rett Syndrome...
November 30, 2016: Journal of Neural Engineering
https://www.readbyqxmd.com/read/27892569/an-ab-initio-study-of-the-ground-and-excited-electronic-states-of-the-methyl-radical
#5
A Zanchet, L Bañares, M L Senent, A García-Vela
The ground and some excited electronic states of the methyl radical have been characterized by means of highly correlated ab intio techniques. The specific excited states investigated are those involved in the dissociation of the radical, namely the 3s and 3pz Rydberg states, and the A1 and B1 valence states crossing them, respectively. The C-H dissociative coordinate and the HCH bending angle were considered in order to generate the first two-dimensional ab initio representation of the potential surfaces of the above electronic states of CH3, along with the nonadiabatic couplings between them...
November 28, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27889678/early-hippocampal-hyperexcitability-in-ps2app-mice-role-of-mutant-ps2-and-app
#6
Roberto Fontana, Mario Agostini, Emanuele Murana, Mufti Mahmud, Elena Scremin, Maria Rubega, Giovanni Sparacino, Stefano Vassanelli, Cristina Fasolato
Alterations of brain network activity are observable in Alzheimer's disease (AD) together with the occurrence of mild cognitive impairment, before overt pathology. However, in humans as well in AD mouse models, identification of early biomarkers of network dysfunction is still at its beginning. We performed in vivo recordings of local field potential activity in the dentate gyrus of PS2APP mice expressing the human amyloid precursor protein (APP) Swedish mutation and the presenilin-2 (PS2) N141I. From a frequency-domain analysis, we uncovered network hyper-synchronicity as early as 3 months, when intracellular accumulation of amyloid beta was also observable...
November 5, 2016: Neurobiology of Aging
https://www.readbyqxmd.com/read/27876513/are-high-lags-of-accommodation-in-myopic-children-due-to-motor-deficits
#7
Vivek Labhishetty, William R Bobier
Children with a progressing myopia exhibit an abnormal pattern of high accommodative lags coupled with high accommodative convergence (AC/A) and high accommodative adaptation. This is not predicted by the current models of accommodation and vergence. Reduced accommodative plant gain and reduced sensitivity to blur have been suggested as potential causes for this abnormal behavior. These etiologies were tested by altering parameters (sensory, controller and plant gains) in the Simulink model of accommodation...
November 25, 2016: Vision Research
https://www.readbyqxmd.com/read/27875126/epileptogenic-source-imaging-using-cross-frequency-coupled-signals-from-scalp-eeg
#8
Chunsheng Li, Daniel Jacobs, Trevor Hilton, Martin Del Campo, Yotin Chinvarun, Peter L Carlen, Berj L Bardakjian
OBJECTIVE: The epileptogenic zone (EZ) is a brain region containing the sources of seizure genesis. Removal of the EZ is associated with cessation of seizures after resective surgical procedures, as measured by Engel Class I score. This study describes a novel EEG (electroencephalography) source imaging (ESI) method which uses cross-frequency coupled potential signals (SCFC) derived from scalp EEG. METHODS: Scalp EEG were recorded from ten patients (20 seizures) suffering from epilepsy...
December 2016: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/27870422/magnetoencephalography-study-of-different-relationships-among-low-and-high-frequency-band-neural-activities-during-the-induction-of-peaceful-and-fearful-audiovisual-modalities-among-males-and-females
#9
Chia-Yen Yang, Ching-Po Lin
Our previous study estimated the bias from the match attributes of the auditory and visual modalities related to a peaceful mood in the male brain. However, the interactions among the four main frequency bands of neural activity remain unknown. Therefore, this study uses magnetoencephalography to explore gender differences in the perceptions of auditory and visual modalities related to peaceful and fearful moods. Instead of analyzing single frequencies, this study analyzes interactions between low-frequency phase and high-frequency amplitude to reflect neural communication...
January 2, 2017: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/27827512/bifunctional-ru-ii-complex-catalysed-carbon-carbon-bond-formation-an-eco-friendly-hydrogen-borrowing-strategy
#10
Kaushik Chakrabarti, Bhaskar Paul, Milan Maji, Bivas Chandra Roy, Sujan Shee, Sabuj Kundu
The atom economical borrowing hydrogen methodology enables the use of alcohols as alkylating agents for selective C-C bond formation. A bifunctional 2-(2-pyridyl-2-ol)-1,10-phenanthroline (phenpy-OH) based Ru(ii) complex (2) was found to be a highly efficient catalyst for the one-pot β-alkylation of secondary alcohols with primary alcohols and double alkylation of cyclopentanol with different primary alcohols. Exploiting the metal-ligand cooperativity in complex 2, several aromatic, aliphatic and heteroatom substituted alcohols were selectively cross-coupled in high yields using significantly low catalyst loading (0...
November 9, 2016: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/27827487/a-computational-study-on-the-superionic-behaviour-of-tho2
#11
P S Ghosh, A Arya, G K Dey, N Kuganathan, R W Grimes
This study reports the density functional theory (DFT) and classical molecular dynamics (MD) study of the lattice dynamical, mechanical and anionic transport behaviours of ThO2 in the superionic state. DFT calculations of phonon frequencies were performed at different levels of approximation as a function of isotropic dilation (ε) in the lattice parameter. With the expansion of the lattice parameter, there is a softening of B1u and Eu phonon modes at the X symmetry point of the Brillouin zone. As a result of the nonlinear decrease at the X point, the B1u and Eu phonon modes cross each other at ε = 0...
November 9, 2016: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/27824611/uncoupling-of-cardiac-and-respiratory-rhythm-in-atrial-fibrillation
#12
Mirjana M Platiša, Tijana Bojić, Siniša U Pavlović, Nikola N Radovanović, Aleksandar Kalauzi
Rearranged origin of heart rhythm in patients with atrial fibrillation (AF) influences the regulation of the heart and consequently the respiratory rhythm, and the bidirectional interaction of these rhythms not documented. Hence, we examined coupling of the RR interval and the respiration (Resp) signal by coherence, Granger causality and the cross-sample entropy method of time series analysis in patients with AF and a healthy control group. In healthy subjects, the influence of respiration on cardiac rhythm was found as increased coherence at the breathing frequency (BF) range, significantly stronger interaction and synchrony from Resp to RR than from RR to Resp...
December 1, 2016: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/27821752/temporal-coding-of-reward-guided-choice-in-the-posterior-parietal-cortex
#13
David J Hawellek, Yan T Wong, Bijan Pesaran
Making a decision involves computations across distributed cortical and subcortical networks. How such distributed processing is performed remains unclear. We test how the encoding of choice in a key decision-making node, the posterior parietal cortex (PPC), depends on the temporal structure of the surrounding population activity. We recorded spiking and local field potential (LFP) activity in the PPC while two rhesus macaques performed a decision-making task. We quantified the mutual information that neurons carried about an upcoming choice and its dependence on LFP activity...
November 22, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27808225/voluntary-control-of-intracortical-oscillations-for-reconfiguration-of-network-activity
#14
Juliana Corlier, Mario Valderrama, Miguel Navarrete, Katia Lehongre, Dominique Hasboun, Claude Adam, Hayat Belaid, Stéphane Clémenceau, Michel Baulac, Stéphane Charpier, Vincent Navarro, Michel Le Van Quyen
Voluntary control of oscillatory activity represents a key target in the self-regulation of brain function. Using a real-time closed-loop paradigm and simultaneous macro- and micro-electrode recordings, we studied the effects of self-induced intracortical oscillatory activity (4-8 Hz) in seven neurosurgical patients. Subjects learned to robustly and specifically induce oscillations in the target frequency, confirmed by increased oscillatory event density. We have found that the session-to-session variability in performance was explained by the functional long-range decoupling of the target area suggesting a training-induced network reorganization...
November 3, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27802274/topology-cross-frequency-and-same-frequency-band-interactions-shape-the-generation-of-phase-amplitude-coupling-in-a-neural-mass-model-of-a-cortical-column
#15
Roberto C Sotero
Phase-amplitude coupling (PAC), a type of cross-frequency coupling (CFC) where the phase of a low-frequency rhythm modulates the amplitude of a higher frequency, is becoming an important indicator of information transmission in the brain. However, the neurobiological mechanisms underlying its generation remain undetermined. A realistic, yet tractable computational model of the phenomenon is thus needed. Here we analyze a neural mass model of a cortical column, comprising fourteen neuronal populations distributed across four layers (L2/3, L4, L5 and L6)...
November 2016: PLoS Computational Biology
https://www.readbyqxmd.com/read/27799906/structure-and-topology-dynamics-of-hyper-frequency-networks-during-rest-and-auditory-oddball-performance
#16
Viktor Müller, Dionysios Perdikis, Timo von Oertzen, Rita Sleimen-Malkoun, Viktor Jirsa, Ulman Lindenberger
Resting-state and task-related recordings are characterized by oscillatory brain activity and widely distributed networks of synchronized oscillatory circuits. Electroencephalographic recordings (EEG) were used to assess network structure and network dynamics during resting state with eyes open and closed, and auditory oddball performance through phase synchronization between EEG channels. For this assessment, we constructed a hyper-frequency network (HFN) based on within- and cross-frequency coupling (WFC and CFC, respectively) at 10 oscillation frequencies ranging between 2 and 20 Hz...
2016: Frontiers in Computational Neuroscience
https://www.readbyqxmd.com/read/27797807/self-induced-intracerebral-gamma-oscillations-in-the-human-cortex
#17
Juliana Corlier, Daphné Rimsky-Robert, Mario Valderrama, Katia Lehongre, Claude Adam, Stéphane Clémenceau, Stéphane Charpier, Julien Bastin, Philippe Kahane, Jean-Philippe Lachaux, Vincent Navarro, Michel Le Van Quyen
Gamma oscillations play a pivotal role in multiple cognitive functions. They enable coordinated activity and communication of local assemblies, while abnormalities in gamma oscillations exist in different neurological and psychiatric diseases. Thus, a specific rectification of gamma synchronization could potentially compensate the deficits in pathological conditions. Previous experiments have shown that animals can voluntarily modulate their gamma power through operant conditioning. Using a closed-loop experimental setup, we show in six intracerebrally recorded epileptic patients undergoing presurgical evaluation that intracerebral power spectrum can be increased in the gamma frequency range (30-80 Hz) at different fronto-temporal cortical sites in human subjects...
December 2016: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/27794298/finite-element-modelling-of-cochlear-electrical-coupling
#18
Paul D Teal, Guangjian Ni
The operation of each hair cell within the cochlea generates a change in electrical potential at the frequency of the vibrating basilar membrane beneath the hair cell. This electrical potential influences the operation of the cochlea at nearby locations and can also be detected as the cochlear microphonic signal. The effect of such potentials has been proposed as a mechanism for the non-local operation of the cochlear amplifier, and the interaction of such potentials has been thought to be the cause of the broadness of cochlea microphonic tuning curves...
October 2016: Journal of the Acoustical Society of America
https://www.readbyqxmd.com/read/27782494/multi-mode-heterodyned-5th-order-infrared-spectroscopy
#19
Joel D Leger, Clyde Varner, Igor V Rubtsov
Fifth-order multidimensional infrared spectroscopy with heterodyned detection was carried out in the three-beam dual-frequency configuration. Numerous 5th-order cross peaks were detected for the 4-azidobutyrate-N-hydroxysuccinimide ester compound in solution involving several vibrational modes ranging in frequency from 1045 to 2100 cm(-1). Cross peaks involving overtones (2X/Z) and combination bands (XY/Z) among the tags, modes X and Y excited by the first two mid-IR laser pulses, and the reporter, modes Z excited by the third laser pulse, were acquired and the factors affecting the amplitude of 5th-order cross peaks are discussed...
October 21, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/27781473/resynchronization-of-circadian-oscillators-and-the-east-west-asymmetry-of-jet-lag
#20
Zhixin Lu, Kevin Klein-Cardeña, Steven Lee, Thomas M Antonsen, Michelle Girvan, Edward Ott
Cells in the brain's Suprachiasmatic Nucleus (SCN) are known to regulate circadian rhythms in mammals. We model synchronization of SCN cells using the forced Kuramoto model, which consists of a large population of coupled phase oscillators (modeling individual SCN cells) with heterogeneous intrinsic frequencies and external periodic forcing. Here, the periodic forcing models diurnally varying external inputs such as sunrise, sunset, and alarm clocks. We reduce the dimensionality of the system using the ansatz of Ott and Antonsen and then study the effect of a sudden change of clock phase to simulate cross-time-zone travel...
September 2016: Chaos
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