keyword
MENU ▼
Read by QxMD icon Read
search

Theta oscillation

keyword
https://www.readbyqxmd.com/read/28930523/the-evolving-concept-of-the-intrinsic-hippocampal-theta-gamma-oscillator
#1
Mauro Cataldi, Chiara Vigliotti
  Three main types of electrical oscillations are recorded from the hippocampus in vivo: theta (θ), gamma (γ) and sharp wave ripples with frequency bands of 4-12, 25-100 and 110-250 Hz, respectively. Theta activity is the more robust of them, and has important physiological roles because it is involved in spatial navigation, memory formation and memory retrieval. Classical lesion studies in vivo have suggested that the hippocampus passively follows the θ  rhythm generated in the septum by neurons that are synaptically connected with hippocampal neurons though septo-hippocampal connections...
January 1, 2018: Frontiers in Bioscience (Scholar Edition)
https://www.readbyqxmd.com/read/28926001/ketamine-differential-neurophysiological-dynamics-in-functional-networks-in-the-rat-brain
#2
A Ahnaou, H Huysmans, R Biermans, N V Manyakov, W H I M Drinkenburg
Recently, the N-methyl-d-aspartate-receptor (NMDAR) antagonist ketamine has emerged as a fast-onset mechanism to achieve antidepressant activity, whereas its psychomimetic, dissociative and amnestic effects have been well documented to pharmacologically model schizophrenia features in rodents. Sleep-wake architecture, neuronal oscillations and network connectivity are key mechanisms supporting brain plasticity and cognition, which are disrupted in mood disorders such as depression and schizophrenia. In rats, we investigated the dynamic effects of acute and chronic subcutaneous administration of ketamine (2...
September 19, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28923361/frontoparietal-theta-oscillations-during-proactive-control-are-associated-with-goal-updating-and-reduced-behavioral-variability
#3
Patrick S Cooper, Aaron S W Wong, Montana McKewen, Patricia T Michie, Frini Karayanidis
Low frequency oscillations in the theta range (4-8Hz) are increasingly recognized as having a crucial role in flexible cognition. Such evidence is typically derived from studies in the context of reactive (stimulus-driven) control processes. However, little research has explored the role of theta oscillations in preparatory control processes. In the current study, we explored the extent of theta oscillations during proactive cognitive control and determined if these oscillations were associated with behavior...
September 15, 2017: Biological Psychology
https://www.readbyqxmd.com/read/28922535/power-and-coherence-of-cortical-high-frequency-oscillations-during-wakefulness-and-sleep
#4
Matías Cavelli, Daniel Rojas-Líbano, Natalia Schwarzkopf, Santiago Castro-Zaballa, Joaquín Gonzalez, Alejandra Mondino, Noelia Santana, Luciana Benedetto, Atilio Falconi, Pablo Torterolo
Recently, a novel type of fast cortical oscillatory activity that occurs between 110 and 160 Hz (high-frequency oscillations (HFO)) was described. HFO are modulated by the theta rhythm in hippocampus and neocortex during active wakefulness and REM sleep. Since theta-HFO coupling increases during REM, a role for HFO in memory consolidation has been proposed. However, global properties like the cortex-wide topographic distribution, and the cortico-cortical coherence remain unknown. In the present study, we recorded the electroencephalogram during sleep and wakefulness in the rat, and analyzed the spatial extent of the HFO band power and coherence...
September 18, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28894235/temporally-and-spatially-distinct-theta-oscillations-dissociate-a-language-specific-from-a-domain-general-processing-mechanism-across-the-age-trajectory
#5
Caroline Beese, Lars Meyer, Benedict Vassileiou, Angela D Friederici
The cognitive functionality of neural oscillations is still highly debated, as different functions have been associated with identical frequency ranges. Theta band oscillations, for instance, were proposed to underlie both language comprehension and domain-general cognitive abilities. Here we show that the ageing brain can provide an answer to the open question whether it is one and the same theta oscillation underlying those functions, thereby resolving a long-standing paradox. While better cognitive functioning is predicted by low theta power in the brain at rest, resting state (RS) theta power declines with age, but sentence comprehension deteriorates in old age...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28890054/home-cage-odors-spatial-cues-elicit-theta-phase-gamma-amplitude-coupling-between-olfactory-bulb-and-dorsal-hippocampus
#6
Roberta Ribas Pena, Daniel de Castro Medeiros, Leonardo de Oliveira Guarnieri, Julio Boriollo Guerra, Vinícius Rezende Carvalho, Eduardo Mazoni Andrade Marçal Mendes, Grace Schenatto Pereira, Márcio Flávio Dutra Moraes
The brain oscillations may play a critical role in synchronizing neuronal assemblies in order to establish appropriate sensory-motor integration. In fact, studies have demonstrated phase-amplitude coupling of distinct oscillatory rhythms during cognitive processes. Here we investigated whether olfacto-hippocampal coupling occurs when mice are detecting familiar odors located in a spatially restricted area of a new context. The spatial olfactory task (SOT) was designed to expose mice to a new environment in which only one quadrant (target) contains odors provided by its own home-cage bedding...
September 7, 2017: Neuroscience
https://www.readbyqxmd.com/read/28887385/prior-learning-of-relevant-non-aversive-information-is-a-boundary-condition-for-avoidance-memory-reconsolidation-in-the-rat-hippocampus
#7
Andressa Radiske, Maria Carolina Gonzalez, Sergio Conde-Ocaziones, Anatildes Feitosa, Cristiano A Köhler, Lia R Bevilaqua, Martín Cammarota
Reactivated memories can be modified during reconsolidation, making this process a potential therapeutic target for post-traumatic stress disorder (PTSD), a mental illness characterized by the recurring avoidance of situations that evoke trauma-related fears. However, avoidance memory reconsolidation depends on a set of still loosely defined boundary conditions, limiting the translational value of basic research. In particular, the involvement of the hippocampus in fear-motivated avoidance memory reconsolidation remains controversial...
September 8, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28887226/reconciling-the-different-faces-of-hippocampal-theta-the-role-of-theta-oscillations-in-cognitive-emotional-and-innate-behaviors
#8
REVIEW
Tatiana Korotkova, Alexey Ponomarenko, Caitlin K Monaghan, Steven L Poulter, Francesca Cacucci, Tom Wills, Michael E Hasselmo, Colin Lever
The theta oscillation (5-10Hz) is a prominent behavior-specific brain rhythm. This review summarizes studies showing the multifaceted role of theta rhythm in cognitive functions, including spatial coding, time coding and memory, exploratory locomotion and anxiety-related behaviors. We describe how activity of hippocampal theta rhythm generators - medial septum, nucleus incertus and entorhinal cortex, links theta with specific behaviors. We review evidence for functions of the theta-rhythmic signaling to subcortical targets, including lateral septum...
September 5, 2017: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/28885722/astrocytic-signaling-supports-hippocampal-prefrontal-theta-synchronization-and-cognitive-function
#9
Vanessa Morais Sardinha, Sónia Guerra-Gomes, Inês Caetano, Gabriela Tavares, Manuella Martins, Joana Santos Reis, Joana Sofia Correia, Andreia Teixeira-Castro, Luísa Pinto, Nuno Sousa, João Filipe Oliveira
Astrocytes interact with neurons at the cellular level through modulation of synaptic formation, maturation, and function, but the impact of such interaction into behavior remains unclear. Here, we studied the dominant negative SNARE (dnSNARE) mouse model to dissect the role of astrocyte-derived signaling in corticolimbic circuits, with implications for cognitive processing. We found that the blockade of gliotransmitter release in astrocytes triggers a critical desynchronization of neural theta oscillations between dorsal hippocampus and prefrontal cortex...
September 8, 2017: Glia
https://www.readbyqxmd.com/read/28882692/hippocampal-theta-phase-contingent-memory-retrieval-in-delay-and-trace-eyeblink-conditioning
#10
Tomi Waselius, Eveliina Pöllänen, Jan Wikgren, Markku Penttonen, Miriam S Nokia
Hippocampal theta oscillations (3-12Hz) play a prominent role in learning. It has been suggested that encoding and retrieval of memories are supported by different phases of the theta cycle. Our previous study on trace eyeblink conditioning in rabbits suggests that the timing of the conditioned stimulus (CS) in relation to theta phase affects encoding but not retrieval of the memory trace. Here, we directly tested the effects of hippocampal theta phase on memory retrieval in two experiments conducted on adult female New Zealand White rabbits...
September 4, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28878628/early-correlated-network-activity-in-the-hippocampus-its-putative-role-in-shaping-neuronal-circuits
#11
REVIEW
Marilena Griguoli, Enrico Cherubini
Synchronized neuronal activity occurring at different developmental stages in various brain structures represents a hallmark of developmental circuits. This activity, which differs in its specific patterns among animal species may play a crucial role in de novo formation and in shaping neuronal networks. In the rodent hippocampus in vitro, the so-called giant depolarizing potentials (GDPs) constitute a primordial form of neuronal synchrony preceding more organized forms of activity such as oscillations in the theta and gamma frequency range...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28864239/network-oscillatory-activity-driven-by-context-memory-processing-is-differently-regulated-by-glutamatergic-and-cholinergic-neurotransmission
#12
Adam M P Miller, Brendan J Frick, David M Smith, Jelena Radulovic, Kevin A Corcoran
Memory retrieval requires coordinated intra- and inter-regional activity in networks of brain structures. Dysfunction of these networks and memory impairment are seen in many psychiatric disorders, but relatively little is known about how memory retrieval and memory failure are represented at the level of local and regional oscillatory activity. To address this question, we measured local field potentials (LFPs) from mice as they explored a novel context, retrieved memories for contextual fear conditioning, and after administration of two amnestic agents: the NMDA receptor antagonist MK-801 and muscarinic acetylcholine receptor antagonist scopolamine (SCOP)...
August 30, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/28853229/average-spectral-power-changes-at-the-hippocampal-electroencephalogram-in-schizophrenia-model-induced-by-ketamine
#13
Luis Rafael L Sampaio, Lucas T N Borges, Joyse M F Silva, Francisca Roselin O de Andrade, Talita M Barbosa, Tatiane Q Oliveira, Danielle Macedo, Ricardo F Lima, Leonardo Pimentel Dantas, Manoel Cláudio Azevedo Patrocinio, Otoni C do Vale, Silvania Mendes M de Vasconcelos
The use of ketamine (Ket) as a pharmacological model of schizophrenia is an important tool for understanding the main mechanisms of glutamatergic regulated neural oscillations. Thus, the aim of the current study was to evaluate Ket induced changes in the average spectral power using the hippocampal quantitative electroencephalography (QEEG). To this end, male Wistar rats were submitted to a stereotactic surgery for the implantation of an electrode in the right hippocampus. After three days, the animals were divided into 4 groups that were treated for 10 consecutive days with Ket (10, 50 or 100 mg/kg)...
August 29, 2017: Fundamental & Clinical Pharmacology
https://www.readbyqxmd.com/read/28845310/developmental-changes-in-sleep-oscillations-during-early-childhood
#14
Eckehard Olbrich, Thomas Rusterholz, Monique K LeBourgeois, Peter Achermann
Although quantitative analysis of the sleep electroencephalogram (EEG) has uncovered important aspects of brain activity during sleep in adolescents and adults, similar findings from preschool-age children remain scarce. This study utilized our time-frequency method to examine sleep oscillations as characteristic features of human sleep EEG. Data were collected from a longitudinal sample of young children (n = 8; 3 males) at ages 2, 3, and 5 years. Following sleep stage scoring, we detected and characterized oscillatory events across age and examined how their features corresponded to spectral changes in the sleep EEG...
2017: Neural Plasticity
https://www.readbyqxmd.com/read/28833629/olfactory-bulb-drives-respiration-coupled-beta-oscillations-in-the-rat-hippocampus
#15
André Lv Lockmann, Diego A Laplagne, Adriano Bl Tort
The synchronization of neuronal oscillations has been suggested as a mechanism to coordinate information flow between distant brain regions. In particular, the olfactory bulb (OB) and the hippocampus (HPC) have been shown to exhibit oscillations in the beta frequency range (10-20 Hz) that are likely to support communication between these structures. Here we further characterize features of beta oscillations in OB and HPC of rats anesthetized with urethane. We find that beta oscillations simultaneously appear in HPC and OB and phase-lock across structures...
August 22, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28811195/epileptic-interictal-discharges-are-more-frequent-during-nrem-slow-wave-downstates
#16
Péter Przemyslaw Ujma, Péter Halász, Anna Kelemen, Dániel Fabó, Loránd Erőss
Epileptiform activity in various but not all epilepsy and recording types and cerebral areas is more frequent in NREM sleep, and especially during sleep periods with high-amplitude EEG slow waves. Slow waves synchronize high-frequency oscillations: physiological activity from the theta through the gamma band usually appears during scalp-positive upstates while epileptiform activity occurs at transitory phases and the scalp-negative downstate. It has been proposed that interictal discharges (IIDs) are facilitated by the high degree of neuronal firing synchrony during slow wave transitory and downstates...
August 12, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28809843/tuning-in-the-hippocampal-theta-band-in-vitro-methodologies-for-recording-from-the-isolated-rodent-septohippocampal-circuit
#17
Frédéric Manseau, Sylvain Williams
This protocol outlines the procedures for preparing and recording from the isolated whole hippocampus, of WT and transgenic mice, along with recent improvements in methodologies and applications for the study of theta oscillations. A simple characterization of the isolated hippocampal preparation is presented whereby the relationship between internal hippocampal theta oscillators is examined together with the activity of pyramidal cells, and GABAergic interneurons, of the cornu ammonis-1 (CA1) and subiculum (SUB) areas...
August 2, 2017: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28803867/dynamics-of-eeg-functional-connectivity-during-statistical-learning
#18
Brigitta Tóth, Karolina Janacsek, Ádám Takács, Andrea Kóbor, Zsófia Zavecz, Dezso Nemeth
Statistical learning is a fundamental mechanism of the brain, which extracts and represents regularities of our environment. Statistical learning is crucial in predictive processing, and in the acquisition of perceptual, motor, cognitive, and social skills. Although previous studies have revealed competitive neurocognitive processes underlying statistical learning, the neural communication of the related brain regions (functional connectivity, FC) has not yet been investigated. The present study aimed to fill this gap by investigating FC networks that promote statistical learning in humans...
August 10, 2017: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/28800744/physiological-artifacts-in-scalp-eeg-and-ear-eeg
#19
Simon L Kappel, David Looney, Danilo P Mandic, Preben Kidmose
BACKGROUND: A problem inherent to recording EEG is the interference arising from noise and artifacts. While in a laboratory environment, artifacts and interference can, to a large extent, be avoided or controlled, in real-life scenarios this is a challenge. Ear-EEG is a concept where EEG is acquired from electrodes in the ear. METHODS: We present a characterization of physiological artifacts generated in a controlled environment for nine subjects. The influence of the artifacts was quantified in terms of the signal-to-noise ratio (SNR) deterioration of the auditory steady-state response...
August 11, 2017: Biomedical Engineering Online
https://www.readbyqxmd.com/read/28800613/ongoing-slow-oscillatory-phase-modulates-speech-intelligibility-in-cooperation-with-motor-cortical-activity
#20
Takayuki Onojima, Keiichi Kitajo, Hiroaki Mizuhara
Neural oscillation is attracting attention as an underlying mechanism for speech recognition. Speech intelligibility is enhanced by the synchronization of speech rhythms and slow neural oscillation, which is typically observed as human scalp electroencephalography (EEG). In addition to the effect of neural oscillation, it has been proposed that speech recognition is enhanced by the identification of a speaker's motor signals, which are used for speech production. To verify the relationship between the effect of neural oscillation and motor cortical activity, we measured scalp EEG, and simultaneous EEG and functional magnetic resonance imaging (fMRI) during a speech recognition task in which participants were required to recognize spoken words embedded in noise sound...
2017: PloS One
keyword
keyword
101704
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"