Filters








5,328 Hits in 3.3 sec

Spontaneous Local Gamma Oscillation Selectively Enhances Neural Network Responsiveness

Se-Bum Paik, Tribhawan Kumar, Donald A. Glaser, Karl J. Friston
2009 PLoS Computational Biology  
This spontaneous oscillatory network activity injects a periodic local current that could amplify a weak synaptic input and enhance the network's responsiveness.  ...  This suggests a generalized mechanism by which neural oscillatory activity can enhance the selectivity of a neural network to FF inputs.  ...  Spontaneous cortical oscillations can be locally induced by spatially localized thalamic inputs, and the cortical response character can also be selectively tuned within a limited region.  ... 
doi:10.1371/journal.pcbi.1000342 pmid:19343222 pmcid:PMC2659453 fatcat:rl54jqzgcnacrdoe7324x6enf4

Synaptic Plasticity Controls Sensory Responses through Frequency-Dependent Gamma Oscillation Resonance

Se-Bum Paik, Donald A. Glaser, Karl J. Friston
2010 PLoS Computational Biology  
Using a model neural network simulation, we found that sensory response in the primary visual cortex is significantly modulated by the resonance between "spontaneous" and "stimulus-driven" oscillations  ...  Synchronized gamma frequency oscillations in neural networks are thought to be important to sensory information processing, and their effects have been intensively studied.  ...  Gamma oscillations synchronize the response of neural populations [12] , selectively amplify local sensory signals [13] , enhance signal transmission by reducing noise [14] , and regulate information  ... 
doi:10.1371/journal.pcbi.1000927 pmid:20838581 pmcid:PMC2936516 fatcat:sssa7ydv45dljhncjyvicmmqfi

The Role of Rhythmic Neural Synchronization in Rest and Task Conditions

Gustavo Deco, Andres Buehlmann, Timothée Masquelier, Etienne Hugues
2011 Frontiers in Human Neuroscience  
During rest, we show how local rhythmic synchrony can induce a spatiotemporally organized spontaneous activity at the brain level.  ...  Rhythmic neural synchronization is found throughout the brain during many different tasks and even at rest. Beyond their underlying mechanisms, the question of their role is still controversial.  ...  One potential role of rhythmic neural activity may be to enhance communication between neural pools.  ... 
doi:10.3389/fnhum.2011.00004 pmid:21326617 pmcid:PMC3035810 fatcat:th65tfiravbw7guchvamqx655i

Inhibitory Interneurons Regulate Temporal Precision and Correlations in Cortical Circuits

Jessica A. Cardin
2018 Trends in Neurosciences  
This review highlights the key roles of inhibitory interneurons in spike correlations and brain rhythms, describes several scales on which GABAergic inhibition regulates timing in neural networks, and  ...  GABAergic interneurons, which are highly diverse, have long been thought to contribute to the timing of neural activity and the generation and shaping of brain rhythms.  ...  Spontaneous gamma oscillations in vivo are eliminated by optogenetic suppression of interneurons [45] and both spontaneous and optogenetically evoked cortical oscillations are abolished by application  ... 
doi:10.1016/j.tins.2018.07.015 pmid:30274604 pmcid:PMC6173199 fatcat:7vmlh5pzqjagzlgre2lu6e3tz4

Can Oscillatory Alpha-Gamma Phase-Amplitude Coupling be Used to Understand and Enhance TMS Effects?

Johanna Wagner, Scott Makeig, David Hoopes, Mateusz Gola
2019 Frontiers in Human Neuroscience  
(PAC) of low-frequency oscillations with high-frequency broadband (or gamma) bursting.  ...  We propose that TMS delivery with simultaneous EEG recording and near real-time estimation of source-resolved alpha-gamma PAC might be used to select the precise timing of TMS pulse deliveries so as to  ...  Based on this body of research we argue that brain stimulation timed to particular phases of spontaneous low-frequency oscillations may enhance neural excitability, by increasing occurrence of appropriately  ... 
doi:10.3389/fnhum.2019.00263 pmid:31427937 pmcid:PMC6689956 fatcat:tboohetr6rbc7l4iqeuacvumea

High-frequency oscillations and the neurobiology of schizophrenia

Peter J Uhlhaas, Wolf Singer
2013 Dialogues in Clinical Neuroscience  
Neural oscillations at low- and high-frequency ranges are a fundamental feature of large-scale networks.  ...  In the first part, we will provide an update on neural oscillations during normal brain functions and discuss underlying mechanisms.  ...  Polania et al 99 showed that tDCS at theta-frequency can facilitate frontoparietal synchrony, and Engelhard et al 100 showed that monkeys can be trained to selectively enhance gamma-band oscillations  ... 
pmid:24174902 pmcid:PMC3811102 fatcat:2rurmxbqrvffhaaodttjb6jlhe

Investigating and Modulating Physiological and Pathological Brain Oscillations: The Role of Oscillatory Activity in Neural Plasticity

Andrea Guerra, Matteo Feurra, Giovanni Pellegrino, John-Stuart Brittain
2019 Neural Plasticity  
gamma reflects intracortical local synchronization [1] [2] [3] .  ...  oscillations, and decreased theta-gamma PAC in the hippocampal circuit, suggesting early dysfunctional hippocampal networks and impaired synaptic plasticity in brainstem tau pathology.  ...  gamma reflects intracortical local synchronization [1] [2] [3] .  ... 
doi:10.1155/2019/9403195 pmid:31885538 pmcid:PMC6899309 fatcat:jg7amhsytfaszedicdqrgitldy

Neuronal Dynamics and Neuropsychiatric Disorders: Toward a Translational Paradigm for Dysfunctional Large-Scale Networks

Peter J. Uhlhaas, Wolf Singer
2012 Neuron  
In recent years, numerous studies have tested the relevance of neural oscillations in neuropsychiatric conditions, highlighting the potential role of changes in temporal coordination as a pathophysiological  ...  Specifically, we will argue that deficits in temporal coordination lead to a disruption of functional large-scale networks which in turn can account for several specific dysfunctions associated with these  ...  Evidence obtained over the last two decades suggests that the precise synchronization of neural responses serves the dynamic coordination of distributed neural responses in both local and extended networks  ... 
doi:10.1016/j.neuron.2012.09.004 pmid:22998866 fatcat:xahr2jmaznazxnq5x5es4wqzpa

Brain oscillations in neuropsychiatric disease

Erol Başar
2013 Dialogues in Clinical Neuroscience  
The term "brain (or neural) oscillations" refers to the rhythmic and/or repetitive electrical activity generated spontaneously and in response to stimuli by neural tissue in the central nervous system.  ...  Le terme d'«oscillations cérébrales ou neuronales» se rapporte à l'activité électrique rythmique et/ou répétitive générée spontanément et en réponse aux stimuli par le tissu neuronal dans le système nerveux  ...  The term "brain (or neural) oscillations" refers to the rhythmic and/or repetitive electrical activity generated spontaneously and in response to stimuli by neural tissue in the central nervous system.  ... 
pmid:24174901 pmcid:PMC3811101 fatcat:6rruy6f4nvfmri6z327ah3mhiy

Effect of steady-state response versus excitatory/inhibitory balance on spiking synchronization in neural networks with log-normal synaptic weight distribution

Sou Nobukawa, Nobuhiko Wagatsuma, Takashi Ikeda, Chiaki Hasegawa, Mitsuru Kikuchi, Tetsuya Takahashi
2021 Cognitive Neurodynamics  
AbstractSynchronization of neural activity, especially at the gamma band, contributes to perceptual functions.  ...  This monotonic reduction can be interpreted as an autonomous, strong-EPSP-dependent spiking activity selectively interfering with the responses to external stimuli.  ...  Whereas in response to a tonic excitation stimulus, the fast inhibitory synaptic connections in the inter inhibitory neural networks also produce gamma-band oscillations, known as interneuronal gamma (  ... 
doi:10.1007/s11571-021-09757-z fatcat:ragiwq5v4bhqnjkueqpnoi6ydq

Memory as the "whole brain work"

Erol Başar
2005 International Journal of Psychophysiology  
The machineries of super-synergy in the whole brain are responsible for formation of sensory -cognitive percepts. 2.  ...  The expression "dynamic memory" is used for memory processes that evoke relevant changes in alpha, gamma, theta and delta activities.  ...  The intensity of electrical oscillatory responses is selective in neural populations.  ... 
doi:10.1016/j.ijpsycho.2005.04.008 pmid:16168506 fatcat:xzn4f7bmyrdbpo5p6lwiyihvde

Brain's alpha, beta, gamma, delta, and theta oscillations in neuropsychiatric diseases [chapter]

Erol Başar, Canan Başar-Eroğlu, Bahar Güntekin, Görsev Gülmen Yener
2013 Supplements to Clinical Neurophysiology  
Selective connectivity between selectively distributed neural networks has to be computed by means of spatial coherence.  ...  The interpretation of results in AD, schizophrenia, and BD (patients mostly with damaged cognitive neural networks) becomes most efficient by joint analysis of results on oscillatory responses and coherences  ...  Selective connectivity Selective connectivity between selectively distributed neural networks has to be computed by means of spatial coherence.  ... 
doi:10.1016/b978-0-7020-5307-8.00002-8 pmid:24053030 fatcat:vj3elstcovh7flqf5enup2libu

Early Development of Network Oscillations in the Ferret Visual Cortex

Yuhui Li, Chunxiu Yu, Zhe Charles Zhou, Iain Stitt, Kristin K. Sellers, John H. Gilmore, Flavio Frohlich
2017 Scientific Reports  
Although oscillations during development have been characterized in a wide range of neural systems, little is known about the interaction between these network oscillations and neuronal spiking, and the  ...  Here we recorded the spontaneous and visualelicited local field potential (LFP) and multi-unit activity (MUA) in the visual cortex of freely-moving juvenile ferrets before and after eye-opening.  ...  the inhibitory component of the local network.  ... 
doi:10.1038/s41598-017-17502-y pmid:29259184 pmcid:PMC5736753 fatcat:fqg75nekvnepngqafv6zbbt4ea

Mice With Decreased Number of Interneurons Exhibit Aberrant Spontaneous and Oscillatory Activity in the Cortex

Katerina Kalemaki, Xanthippi Konstantoudaki, Simona Tivodar, Kyriaki Sidiropoulou, Domna Karagogeos
2018 Frontiers in Neural Circuits  
Furthermore, under spontaneous recording conditions, Rac1 cKO brain slices exhibit enhanced sensitivity and susceptibility to emergent spontaneous activity.  ...  We also find that this developmental decrease in the number of cortical interneurons results in local neuronal networks with alterations in neuronal oscillations, exhibiting decreased power in low frequencies  ...  In this report, we aim to investigate changes in local cortical network activities that occur in response to developmentally reduced inhibition.  ... 
doi:10.3389/fncir.2018.00096 fatcat:d3xfhko6avh5hfznsa3hn6fdim

Could LC-NE-Dependent Adjustment of Neural Gain Drive Functional Brain Network Reorganization?

Carole Guedj, David Meunier, Martine Meunier, Fadila Hadj-Bouziane
2017 Neural Plasticity  
Accordingly, as a reset signal, the LC-NE system could trigger brain network reorganizations in response to salient information in the environment and/or adjust the neural gain within its target regions  ...  , thus making it possible to reorganize neuronal ensembles, functional networks, and ultimately, behavioral responses.  ...  Interestingly, a recent optogenetic manipulation modulating the level of gamma rhythmic inputs suggests that gamma oscillations enhance signal transmission by increasing neural gain [80] .  ... 
doi:10.1155/2017/4328015 pmid:28607776 pmcid:PMC5457760 fatcat:dewkqjmnczer7okheecun46yga
« Previous Showing results 1 — 15 out of 5,328 results