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Theta oscillation

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https://www.readbyqxmd.com/read/28213446/acetylcholine-release-in-prefrontal-cortex-promotes-gamma-oscillations-and-theta-gamma-coupling-during-cue-detection
#1
W M Howe, H J Gritton, N Lusk, Erik A Roberts, Vaughn L Hetrick, Joshua D Berke, Martin Sarter
The capacity for using external cues to guide behavior ("cue detection") constitutes an essential aspect of attention and goal-directed behavior. The cortical cholinergic input system, via phasic increases in prefrontal acetylcholine release, plays an essential role in attention by mediating such cue detection. However, the relationship between cholinergic signaling during cue detection and neural activity dynamics in prefrontal networks remains unclear. Here we combined sub-second measures of cholinergic signaling, neurophysiological recordings, and cholinergic receptor blockade to delineate the cholinergic contributions to prefrontal oscillations during cue detection in rats...
February 17, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28210848/prefrontal-hippocampal-coupling-by-theta-rhythm-and-by-2-5%C3%A2-hz-oscillation-in-the-delta-band-the-role-of-the-nucleus-reuniens-of-the-thalamus
#2
Alexis Roy, Frans Pettersson Svensson, Amna Mazeh, Bernat Kocsis
Rhythmic synchronizations of hippocampus (HC) and prefrontal cortex (PFC) at theta frequencies (4-8 Hz) are thought to mediate key cognitive functions, and disruptions of HC-PFC coupling were implicated in psychiatric diseases. Theta coupling is thought to represent a HC-to-PFC drive transmitted via the well-described unidirectional HC projection to PFC. In comparison, communication in the PFC-to-HC direction is less understood, partly because no known direct anatomical connection exists. Two recent findings, i...
February 16, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28195129/low-frequency-theta-oscillations-in-the-human-hippocampus-during-real-world-and-virtual-navigation
#3
Véronique D Bohbot, Milagros S Copara, Jean Gotman, Arne D Ekstrom
Low-Frequency Oscillations (LFO) in the range of 7-9 Hz, or theta rhythm, has been recorded in rodents ambulating in the real world. However, intra-hippocampus EEG recordings during virtual navigation in humans have consistently reported LFO that appear to predominate around 3-4 Hz. Here we report clear evidence of 7-9 Hz rhythmicity in raw intra-hippocampus EEG traces during real as well as virtual movement. Oscillations typically occur at a lower frequency in virtual than real world navigation. This study highlights the possibility that human and rodent hippocampal EEG activity are not as different as previously reported and this difference may arise, in part, due to the lack of actual movement in previous human navigation studies, which were virtual...
February 14, 2017: Nature Communications
https://www.readbyqxmd.com/read/28192459/differential-effects-of-ongoing-eeg-beta-and-theta-power-on-memory-formation
#4
Sebastian Scholz, Signe Luisa Schneider, Michael Rose
Recently, elevated ongoing pre-stimulus beta power (13-17 Hz) at encoding has been associated with subsequent memory formation for visual stimulus material. It is unclear whether this activity is merely specific to visual processing or whether it reflects a state facilitating general memory formation, independent of stimulus modality. To answer that question, the present study investigated the relationship between neural pre-stimulus oscillations and verbal memory formation in different sensory modalities. For that purpose, a within-subject design was employed to explore differences between successful and failed memory formation in the visual and auditory modality...
2017: PloS One
https://www.readbyqxmd.com/read/28192457/time-varying-spectral-power-of-resting-state-fmri-networks-reveal-cross-frequency-dependence-in-dynamic-connectivity
#5
Maziar Yaesoubi, Robyn L Miller, Vince D Calhoun
Brain oscillations and synchronicity among brain regions (brain connectivity) have been studied in resting-state (RS) and task-induced settings. RS-connectivity which captures brain functional integration during an unconstrained state is shown to vary with the frequency of oscillations. Indeed, high temporal resolution modalities have demonstrated both between and cross-frequency connectivity spanning across frequency bands such as theta and gamma. Despite high spatial resolution, functional magnetic resonance imaging (fMRI) suffers from low temporal resolution due to modulation with slow-varying hemodynamic response function (HRF) and also relatively low sampling rate...
2017: PloS One
https://www.readbyqxmd.com/read/28188217/hebbian-spike-timing-dependent-plasticity-at-the-cerebellar-input-stage
#6
M Sgritta, F Locatelli, T Soda, F Prestori, E D'Angelo
Spike-timing dependent plasticity (STDP) is a form of long-term synaptic plasticity exploiting the time relationship between postsynaptic action potentials (AP) and EPSPs. Surprisingly enough, very little was known about STDP in the cerebellum, although it is thought to play a critical role for learning appropriate timing of actions. We speculated that low-frequency oscillations observed in the granular layer may provide a reference for repetitive EPSP/AP phase coupling. Here we show that EPSP-spike pairing at 6Hz can optimally induce STDP at the mossy fiber - granule cell synapse in rats...
February 10, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28177924/adapted-wavelet-transform-improves-time-frequency-representations-a-study-of-auditory-elicited-p300-like-event-related-potentials-in-rats
#7
Nelly Richard, Bettina Laursen, Morten Grupe, Asbjørn M Drewes, Carina Graversen, Helge B D Sørensen, Jesper F Bastlund
OBJECTIVE: Active auditory oddball paradigms are simple tone discrimination tasks used to study the P300 deflection of event-related potentials (ERPs). These ERPs may be quantified by time-frequency analysis. As auditory stimuli cause early high frequency and late low frequency ERP oscillations, the continuous wavelet transform (CWT) is often chosen for decomposition due to its multi-resolution properties. However, as the conventional CWT traditionally applies only one mother wavelet to represent the entire spectrum, the time-frequency resolution is not optimal across all scales...
February 8, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28176756/amygdala-hippocampal-dynamics-during-salient-information-processing
#8
Jie Zheng, Kristopher L Anderson, Stephanie L Leal, Avgusta Shestyuk, Gultekin Gulsen, Lilit Mnatsakanyan, Sumeet Vadera, Frank P K Hsu, Michael A Yassa, Robert T Knight, Jack J Lin
Recognizing motivationally salient information is critical to guiding behaviour. The amygdala and hippocampus are thought to support this operation, but the circuit-level mechanism of this interaction is unclear. We used direct recordings in the amygdala and hippocampus from human epilepsy patients to examine oscillatory activity during processing of fearful faces compared with neutral landscapes. We report high gamma (70-180 Hz) activation for fearful faces with earlier stimulus evoked onset in the amygdala compared with the hippocampus...
February 8, 2017: Nature Communications
https://www.readbyqxmd.com/read/28174610/frequency-shift-in-topography-of-spontaneous-brain-rhythms-from-childhood-to-adulthood
#9
E I Rodríguez-Martínez, F J Ruiz-Martínez, C I Barriga Paulino, Carlos M Gómez
It has been described that the frequency ranges at which theta, mu and alpha rhythms oscillate is increasing with age. The present report, by analyzing the spontaneous EEG, tries to demonstrate whether there is an increase with age in the frequency at which the cortical structures oscillate. A topographical approach was followed. The spontaneous EEG of one hundredand seventy subjects was recorded. The spectral power (from 0.5 to 45.5 Hz) was obtained by means of the Fast Fourier Transform. Correlations of spatial topographies among the different age groups showed that older groups presented the same topographical maps as younger groups, but oscillating at higher frequencies...
February 2017: Cognitive Neurodynamics
https://www.readbyqxmd.com/read/28174533/reward-dependent-invigoration-relates-to-theta-oscillations-and-is-predicted-by-dopaminergic-midbrain-integrity-in-healthy-elderly
#10
Tineke K Steiger, Nico Bunzeck
Motivation can have invigorating effects on behavior via dopaminergic neuromodulation. While this relationship has mainly been established in theoretical models and studies in younger subjects, the impact of structural declines of the dopaminergic system during healthy aging remains unclear. To investigate this issue, we used electroencephalography (EEG) in healthy young and elderly humans in a reward-learning paradigm. Specifically, scene images were initially encoded by combining them with cues predicting monetary reward (high vs...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28169319/early-life-stress-impairs-recognition-memory-and-perturbs-the-functional-maturation-of-prefrontal-hippocampal-perirhinal-networks
#11
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/28168896/binge-drinking-affects-brain-oscillations-linked-to-motor-inhibition-and-execution
#12
Eduardo López-Caneda, Socorro Rodríguez Holguín, Ángeles Correas, Carina Carbia, Alberto González-Villar, Fernando Maestú, Fernando Cadaveira
INTRODUCTION: Neurofunctional studies have shown that binge drinking patterns of alcohol consumption during adolescence and youth are associated with anomalies in brain functioning. Recent evidence suggests that event-related oscillations may be an appropriate index of neurofunctional damage associated with alcoholism. However, there is no study to date that has evaluated the effects of binge drinking on oscillatory brain responses related to task performance. The purpose of the present study was to examine brain oscillations linked to motor inhibition and execution in young binge drinkers (BDs) compared with age-matched controls...
January 1, 2017: Journal of Psychopharmacology
https://www.readbyqxmd.com/read/28167897/meg-signatures-of-a-perceived-match-or-mismatch-between-individual-and-group-opinions
#13
Ivan Zubarev, Vasily Klucharev, Alexei Ossadtchi, Victoria Moiseeva, Anna Shestakova
Humans often adjust their opinions to the perceived opinions of others. Neural responses to a perceived match or mismatch between individual and group opinions have been investigated previously, but some findings are inconsistent. In this study, we used magnetoencephalographic source imaging to investigate further neural responses to the perceived opinions of others. We found that group opinions mismatching with individual opinions evoked responses in the anterior and posterior medial prefrontal cortices, as well as in the temporoparietal junction and ventromedial prefrontal cortex in the 220-320 and 380-530 ms time windows...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28161726/medial-entorhinal-cortex-and-medial-septum-contribute-to-self-motion-based-linear-distance-estimation
#14
Pierre-Yves Jacob, Marta Gordillo-Salas, Justine Facchini, Bruno Poucet, Etienne Save, Francesca Sargolini
Path integration is a navigation strategy that requires animals to integrate self-movements during exploration to determine their position in space. The medial entorhinal cortex (MEC) has been suggested to play a pivotal role in this process. Grid cells, head-direction cells, border cells as well as speed cells within the MEC collectively provide a dynamic representation of the animal position in space based on the integration of self-movements. All these cells are strongly modulated by theta oscillations, thus suggesting that theta rhythmicity in the MEC may be essential for integrating and coordinating self-movement information during navigation...
February 4, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28152425/stimulation-of-the-medial-septum-improves-performance-in-spatial-learning-following-pilocarpine-induced-status-epilepticus
#15
Darrin J Lee, Ali Izadi, Mikhail Melnik, Stacey Seidl, Angela Echeverri, Kiarash Shahlaie, Gene G Gurkoff
Temporal lobe epilepsy often leads to hippocampal sclerosis and persistent cognitive deficits, including difficulty with learning and memory. Hippocampal theta oscillations are critical in optimizing hippocampal function and facilitating plasticity. We hypothesized that pilocarpine-induced status epilepticus would disrupt oscillations and behavioral performance and that electrical neuromodulation to entrain theta would improve cognition specifically in injured rats. Rats received a pilocarpine (n=30) or saline injection (n=27) and unilateral bi-polar electrodes were implanted into the medial septum and hippocampus the following day...
January 17, 2017: Epilepsy Research
https://www.readbyqxmd.com/read/28148460/impaired-theta-gamma-coupling-during-working-memory-performance-in-schizophrenia
#16
Mera S Barr, Tarek K Rajji, Reza Zomorrodi, Natasha Radhu, Tony P George, Daniel M Blumberger, Zafiris J Daskalakis
BACKGROUND: Working memory deficits represent a core feature of schizophrenia. These deficits have been associated with dysfunctional dorsolateral prefrontal cortex (DLPFC) cortical oscillations. Theta-gamma coupling describes the modulation of gamma oscillations by theta phasic activity that has been directly associated with the ordering of information during working memory performance. Evaluating theta-gamma coupling may provide greater insight into the neural mechanisms mediating working memory deficits in this disorder...
January 29, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28141803/brain-computer-interface-based-communication-in-the-completely-locked-in-state
#17
Ujwal Chaudhary, Bin Xia, Stefano Silvoni, Leonardo G Cohen, Niels Birbaumer
Despite partial success, communication has remained impossible for persons suffering from complete motor paralysis but intact cognitive and emotional processing, a state called complete locked-in state (CLIS). Based on a motor learning theoretical context and on the failure of neuroelectric brain-computer interface (BCI) communication attempts in CLIS, we here report BCI communication using functional near-infrared spectroscopy (fNIRS) and an implicit attentional processing procedure. Four patients suffering from advanced amyotrophic lateral sclerosis (ALS)-two of them in permanent CLIS and two entering the CLIS without reliable means of communication-learned to answer personal questions with known answers and open questions all requiring a "yes" or "no" thought using frontocentral oxygenation changes measured with fNIRS...
January 2017: PLoS Biology
https://www.readbyqxmd.com/read/28140398/theta-and-high-beta-networks-for-feedback-processing-a-simultaneous-eeg-fmri-study-in-healthy-male-subjects
#18
C Andreou, H Frielinghaus, J Rauh, M Mußmann, S Vauth, P Braun, G Leicht, C Mulert
The reward system is important in assessing outcomes to guide behavior. To achieve these purposes, its core components interact with several brain areas involved in cognitive and emotional processing. A key mechanism suggested to subserve these interactions is oscillatory activity, with a prominent role of theta and high-beta oscillations. The present study used single-trial coupling of simultaneously recorded electroencephalography and functional magnetic resonance imaging data to investigate networks associated with oscillatory responses to feedback during a two-choice gambling task in healthy male participants (n=19)...
January 31, 2017: Translational Psychiatry
https://www.readbyqxmd.com/read/28137968/two-independent-frontal-midline-theta-oscillations-during-conflict-detection-and-adaptation-in-a-simon-type-manual-reaching-task
#19
Thomas Töllner, Yijun Wang, Scott Makeig, Hermann J Müller, Tzyy-Ping Jung, Klaus Gramann
: One of the most firmly established factors determining the speed of human behavioral responses towards action-critical stimuli is the spatial correspondence between the stimulus and response locations. If both locations match, the time taken for response production is markedly reduced relative to when they mismatch-a phenomenon called Simon effect. While there is a consensus that this stimulus-response (S-R) conflict is associated with brief (4-7 Hz) frontal midline theta (fmθ) complexes generated in medial frontal cortex (MFC), it remains controversial (i) whether there are multiple, simultaneously active theta generator areas in the MFC that commonly give rise to conflict-related fmθ complexes; and if so, (ii) whether they are all related to the resolution of conflicting task information...
January 30, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28128335/repeated-nicotine-strengthens-gamma-oscillations-in-the-prefrontal-cortex-and-improves-visual-attention
#20
Lezio S Bueno-Junior, Nicholas W Simon, Meredyth A Wegener, Bita Moghaddam
Nicotine has strong addictive as well as procognitive properties. While a large body of research on nicotine continues to inform us about mechanisms related to its reinforcing effects, less is known about clinically relevant mechanisms that subserve its cognitive enhancing properties. Understanding the latter is critical for developing optimal strategies for treating cognitive deficits. The primary brain region implicated in cognitive functions improved by nicotine is the prefrontal cortex (PFC). Here we assessed the impact of nicotine on unit activity and local field potential (LFP) oscillations in the PFC of behaving rats...
January 27, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
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