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Theta oscillation

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https://www.readbyqxmd.com/read/29329819/the-effect-of-continuous-positive-airway-pressure-on-spectral-encephalogram-characteristics-in-stroke-patients-with-obstructive-sleep-apnea
#1
Hisham Alshaer, Aditya Pandya, Igor Zivanovic, Carolina Gonzaga Carvalho, Clodagh Ryan
OBJECTIVES: To evaluate if treatment with continuous positive airway pressure (CPAP) compared to usual care in stroke patients with obstructive sleep apnea (OSA) over one month reduces delta and alpha oscillations on quantitative electroencephalography (EEG) in association with improvements in cognitive or functional outcomes. METHODS: Spectral EEG analysis was performed in patients with subacute stroke and OSA randomized to usual care or CPAP treatment from a previous study...
January 9, 2018: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/29329355/when-the-brain-changes-its-mind-oscillatory-dynamics-of-conflict-processing-and-response-switching-in-a-flanker-task-during-alcohol-challenge
#2
Lauren E Beaton, Sheeva Azma, Ksenija Marinkovic
Despite the subjective experience of being in full and deliberate control of our actions, our daily routines rely on a continuous and interactive engagement of sensory evaluation and response preparation streams. They unfold automatically and unconsciously and are seamlessly integrated with cognitive control which is mobilized by stimuli that evoke ambiguity or response conflict. Methods with high spatio-temporal sensitivity are needed to provide insight into the interplay between automatic and controlled processing...
2018: PloS One
https://www.readbyqxmd.com/read/29321584/the-critical-role-of-phase-difference-in-theta-oscillation-between-bilateral-parietal-cortices-for-visuospatial-working-memory
#3
Philip Tseng, Kai-Chi Iu, Chi-Hung Juan
Visual working memory (VWM) refers to people's ability to maintain and manipulate visual information on line. Its capacity varies between individuals, and neuroimaging studies have suggested a link between one's VWM capacity and theta power in the parietal cortex. However, it is unclear how the parietal cortices communicate with each other in order to support VWM processing. In two experiments we employed transcranial alternate current stimulation (tACS) to use frequency-specific (6 Hz) alternating current to modulate theta oscillation between the left and right parietal cortex with either in-phase (0° difference, Exp 1), anti-phase (180° difference, Exp 2), or sham sinusoidal current stimulation...
January 10, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29317288/time-frequency-analysis-of-event-related-potentials-associated-with-the-origin-of-the-motor-interference-effect-from-dangerous-objects
#4
Peng Liu
Previous research has suggested that the motor interference effect of dangerous objects may originate from danger evaluations rather than direct response inhibition, as evidenced by a larger parietal P3 amplitude (which represents danger evaluations) under dangerous conditions than under safe conditions and an insignificant difference between dangerous and safe conditions in the frontal P3 component (which represents response inhibition). However, an alternative explanation exists for the null effect of the frontal P3 component...
January 6, 2018: Brain Research
https://www.readbyqxmd.com/read/29317186/perturbation-of-theta-gamma-coupling-at-the-temporal-lobe-hinders-verbal-declarative-memory
#5
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/29315516/strong-coupling-between-slow-oscillations-and-wide-fast-ripples-in-children-with-epileptic-spasms-investigation-of-modulation-index-and-occurrence-rate
#6
Yasushi Iimura, Kevin Jones, Lynne Takada, Itsuki Shimizu, Misaki Koyama, Kyoko Hattori, Yushi Okazawa, Yutaka Nonoda, Eishi Asano, Tomoyuki Akiyama, Cristina Go, Ayako Ochi, O Carter Snead, Elizabeth J Donner, James T Rutka, James M Drake, Hiroshi Otsubo
OBJECTIVE: Epileptic spasms (ES) often become drug-resistant. To reveal the electrophysiological difference between children with ES (ES+) and without ES (ES-), we compared the occurrence rate (OR) of high-frequency oscillations (HFOs) and the modulation index (MI) of coupling between slow and fast oscillations. In ES+, we hypothesized that (1) pathological HFOs are more widely distributed and (2) slow oscillations show stronger coupling with pathological HFOs than in ES-. METHODS: We retrospectively reviewed 24 children with drug-resistant multilobar onset epilepsy, who underwent intracranial video electroencephalography prior to multilobar resections...
January 6, 2018: Epilepsia
https://www.readbyqxmd.com/read/29312826/heteroassociative-storage-of-hippocampal-pattern-sequences-in-the-ca3-subregion
#7
Raphael Y de Camargo, Renan S Recio, Marcelo B Reyes
Background: Recent research suggests that the CA3 subregion of the hippocampus has properties of both autoassociative network, due to its ability to complete partial cues, tolerate noise, and store associations between memories, and heteroassociative one, due to its ability to store and retrieve sequences of patterns. Although there are several computational models of the CA3 as an autoassociative network, more detailed evaluations of its heteroassociative properties are missing. Methods: We developed a model of the CA3 subregion containing 10,000 integrate-and-fire neurons with both recurrent excitatory and inhibitory connections, and which exhibits coupled oscillations in the gamma and theta ranges...
2018: PeerJ
https://www.readbyqxmd.com/read/29290553/oscillations-synchronize-amygdala-to-prefrontal-primate-circuits-during-aversive-learning
#8
Aryeh Hai Taub, Rita Perets, Eilat Kahana, Rony Paz
The contribution of oscillatory synchrony in the primate amygdala-prefrontal pathway to aversive learning remains largely unknown. We found increased power and phase synchrony in the theta range during aversive conditioning. The synchrony was linked to single-unit spiking and exhibited specific directionality between input and output measures in each region. Although it was correlated with the magnitude of conditioned responses, it declined once the association stabilized. The results suggest that amygdala spikes help to synchronize ACC activity and transfer error signal information to support memory formation...
December 20, 2017: Neuron
https://www.readbyqxmd.com/read/29286538/effect-of-gabapentin-on-sleep-and-event-related-oscillations-eros-in-rats-exposed-to-chronic-intermittent-ethanol-vapor-and-protracted-withdrawal
#9
Manuel Sanchez-Alavez, Derek N Wills, Leslie Amodeo, Cindy L Ehlers
Disturbances in sleep architecture, especially reductions in slow wave sleep (SWS), are symptoms commonly observed in individuals with alcohol use disorders (AUDs). Recent clinical trials have demonstrated that the anticonvulsant and analgesic drug Gabapentin may have therapeutic value in normalizing sleep quality in recovering alcoholics. However, the brain mechanisms underlying this improvement in sleep following Gabapentin treatment remain unknown METHODS: In the present study, adult Wistar rats were exposed to 8 weeks of chronic intermittent ethanol vapor (CIE) (blood ethanol concentrations averaged 128...
December 29, 2017: Alcoholism, Clinical and Experimental Research
https://www.readbyqxmd.com/read/29283467/characterizing-synchrony-patterns-across-cognitive-task-stages-of-associative-recognition-memory
#10
Oscar Portoles, Jelmer P Borst, Marieke K van Vugt
Numerous studies seek to understand the role of oscillatory synchronization in cognition. This problem is particularly challenging in the context of complex cognitive behavior, which consists of a sequence of processing steps with uncertain duration. In this study, we analyzed oscillatory connectivity measures in time windows that previous computational models had associated with a specific sequence of processing steps in an associative memory recognition task (visual encoding, familiarity, memory retrieval, decision making, and motor response)...
December 28, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29283465/delta-but-not-theta-band-cortical-entrainment-involves-speech-specific-processing
#11
Nicola Molinaro, Mikel Lizarazu
Cortical oscillations phase-align to the quasi-rhythmic structure of the speech envelope. This speech-brain entrainment has been reported in two frequency bands, i.e., both in the theta band (4 - 8 Hz) and in the delta band (< 4 Hz). However, it is not clear if these two phenomena reflect passive synchronization of the auditory cortex to the acoustics of the speech input, or if they reflect higher processes involved in actively parsing speech information. Here we report two magnetoencephalography experiments in which we contrasted cortical entrainment to natural speech compared to qualitative different control conditions (Experiment 1: amplitude modulated white-noise; Experiment 2: spectrally rotated speech)...
December 28, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29279411/removal-of-perineuronal-nets-disrupts-recall-of-a-remote-fear-memory
#12
Elise Holter Thompson, Kristian Kinden Lensjø, Mattis Brænne Wigestrand, Anders Malthe-Sørenssen, Torkel Hafting, Marianne Fyhn
Throughout life animals learn to recognize cues that signal danger and instantaneously initiate an adequate threat response. Memories of such associations may last a lifetime and far outlast the intracellular molecules currently found to be important for memory processing. The memory engram may be supported by other more stable molecular components, such as the extracellular matrix structure of perineuronal nets (PNNs). Here, we show that recall of remote, but not recent, visual fear memories in rats depend on intact PNNs in the secondary visual cortex (V2L)...
December 26, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29279309/evidence-for-long-timescale-patterns-of-synaptic-inputs-in-ca1-of-awake-behaving-mice
#13
Ilya Kolb, Giovanni Talei Franzesi, Michael Wang, Suhasa B Kodandaramaiah, Craig R Forest, Edward S Boyden, Annabelle C Singer
Repeated sequences of neural activity are a pervasive feature of neural networks in vivo and in vitro. In the hippocampus, sequential firing of many neurons over 100-300 ms periods re-occurs during behavior and during periods of quiescence. However, it is not known whether the hippocampus produces longer sequences of activity or whether such sequences are restricted to specific network states. Furthermore, whether long repeated patterns of activity are transmitted to single cells downstream is unclear. To answer these questions, we recorded intracellularly from hippocampal CA1 of awake, behaving male mice, to examine both subthreshold activity and spiking output in single neurons...
December 26, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29274393/the-social-regulation-of-pain-autonomic-and-neurophysiological-changes-associated-with-perceived-threat
#14
Xianwei Che, Robin Cash, Paul Fitzgerald, Bernadette M Fitzgibbon
The analgesic effect of social support is proposed as a function of social support modulating perceived threat of painful stimuli. In the current study, we directly examined the social-buffering effect in the context of the threat of pain. Eighteen healthy participants were subjected to the threat of pain while they held the hand of a close other, a stranger, or not at all. Neural and autonomic responses were recorded using electroencephalogram (EEG) and heart rate respectively. Close other hand-holding reduced pain perception...
December 20, 2017: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/29262336/hippocampus-and-entorhinal-cortex-recruit-cholinergic-and-nmda-receptors-separately-to-generate-hippocampal-theta-oscillations
#15
Zhenglin Gu, Georgia M Alexander, Serena M Dudek, Jerrel L Yakel
Although much progress has been made in understanding type II theta rhythm generation under urethane anesthesia, less is known about the mechanisms underlying type I theta generation during active exploration. To better understand the contributions of cholinergic and NMDA receptor activation to type I theta generation, we recorded hippocampal theta oscillations from freely moving mice with local infusion of cholinergic or NMDA receptor antagonists to either the hippocampus or the entorhinal cortex (EC). We found that cholinergic receptors in the hippocampus, but not the EC, and NMDA receptors in the EC, but not the hippocampus, are critical for open-field theta generation and Y-maze performance...
December 19, 2017: Cell Reports
https://www.readbyqxmd.com/read/29261133/eeg-dynamics-of-a-go-nogo-task-in-children-with-adhd
#16
Simon Baijot, Carlos Cevallos, David Zarka, Axelle Leroy, Hichem Slama, Cecile Colin, Nicolas Deconinck, Bernard Dan, Guy Cheron
BACKGROUND: Studies investigating event-related potential (ERP) evoked in a Cue-Go/NoGo paradigm have shown lower frontal N1, N2 and central P3 in children with attention-deficit/hyperactivity disorder (ADHD) compared to typically developing children (TDC). However, the electroencephalographic (EEG) dynamics underlying these ERPs remain largely unexplored in ADHD. METHODS: We investigate the event-related spectral perturbation and inter-trial coherence linked to the ERP triggered by visual Cue-Go/NoGo stimuli, in 14 children (7 ADHD and 7 TDC) aged 8 to 12 years...
December 20, 2017: Brain Sciences
https://www.readbyqxmd.com/read/29259184/early-development-of-network-oscillations-in-the-ferret-visual-cortex
#17
Yuhui Li, Chunxiu Yu, Zhe Charles Zhou, Iain Stitt, Kristin K Sellers, John H Gilmore, Flavio Frohlich
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 interactions among different oscillation frequencies. Here we recorded the spontaneous and visual-elicited local field potential (LFP) and multi-unit activity (MUA) in the visual cortex of freely-moving juvenile ferrets before and after eye-opening. We found that both the spontaneous and visually-elicited LFP power was increased after eye-opening, especially in higher frequency bands (>30 Hz)...
December 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29250857/theta-oscillations-reflect-conflict-processing-in-the-perception-of-the-mcgurk-illusion
#18
Luis Morís Fernández, Mireia Torralba Cuello, Salvador Soto-Faraco
The McGurk illusion is one of the most famous illustrations of cross-modal integration in human perception. It has been often used as a proxy of audiovisual integration and to infer the properties of the integration process in natural (congruent) audiovisual conditions. Nonetheless, a blatant difference between McGurk stimuli and natural, congruent, audiovisual speech is the conflict between the auditory and the visual information in the former. Here we hypothesized that McGurk stimuli (and any audiovisual incongruency) engage brain responses similar to those found in more general cases of perceptual conflict (e...
December 18, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29247465/cannabinoid-glutamate-interactions-and-neural-oscillations-implications-for-psychosis
#19
Mohamed A Sherif, Jose A Cortes-Briones, Mohini Ranganathan, Patrick D Skosnik
Preclinical and clinical data suggest that the cannabinoid and glutamatergic systems are implicated in the pathophysiology of schizophrenia (SZ), the prototypical psychotic disorder. This has led to distinct "cannabis" and "ketamine" models of SZ, respectively. However, these two models need not be mutually exclusive. Indeed, in several brain regions implicated in the putative neural circuitry of SZ (e.g., hippocampus, frontal cortex, cerebellum), cannabinoid receptors type 1 (CB1Rs) and glutamate N-methyl-D-aspartate receptors (NMDARs) have direct and indirect interactions...
December 15, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29244639/oscillatory-mechanisms-of-response-conflict-elicited-by-color-and-motion-direction-an-individual-differences-approach
#20
Marlies E Vissers, K Richard Ridderinkhof, Michael X Cohen, Heleen A Slagter
Goal-directed behavior requires control over automatic behavior, for example, when goal-irrelevant information from the environment captures an inappropriate response and conflicts with the correct, goal-relevant action. Neural oscillations in the theta band (∼6 Hz) measured at midfrontal electrodes are thought to form an important substrate of the detection and subsequent resolution of response conflict. Here, we examined the extent to which response conflict and associated theta-band activity depend on the visual stimulus feature dimension that triggers the conflict...
December 15, 2017: Journal of Cognitive Neuroscience
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