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Theta oscillation

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https://www.readbyqxmd.com/read/28647483/demands-on-response-inhibition-processes-determine-modulations-of-theta-band-activity-in-superior-frontal-areas-and-correlations-with-pupillometry-implications-for-the-norepinephrine-system-during-inhibitory-control
#1
Gabriel Dippel, Moritz Mückschel, Tjalf Ziemssen, Christian Beste
Response inhi bition processes are important for goal-directed behavior and particularly demanded when it is unlikely to inhibit automatically executed responses. It has been suggested that the norepinephrine (NE) system is important to consider for such likelihood effects. As an indirect measure of the NE system activity we used the pupil diameter and integrated this data with neurophysiological (EEG) data and beamforming analyses. The study shows that inhibitory control processes reflected by theta oscillations are strongly modulated by the likelihood to employ these processes and that these mechanisms were related to neural processes in the SMA and SFG...
June 21, 2017: NeuroImage
https://www.readbyqxmd.com/read/28642341/use-of-intraoperative-local-field-potential-spectral-analysis-to-differentiate-basal-ganglia-structures-in-parkinson-s-disease-patients
#2
Rachel Kolb, Aviva Abosch, Gidon Felsen, John A Thompson
Identification of brain structures traversed during implantation of deep brain-stimulating (DBS) electrodes into the subthalamic nucleus (STN-DBS) for the treatment of Parkinson's disease (PD) frequently relies on subjective correspondence between kinesthetic response and multiunit activity. However, recent work suggests that local field potentials (LFP) could be used as a more robust signal to objectively differentiate subcortical structures. The goal of this study was to analyze the spectral properties of LFP collected during STN-DBS in order to objectively identify commonly traversed brain regions and improve our understanding of aberrant oscillations in the PD-related pathophysiological cortico-basal ganglia network...
June 2017: Physiological Reports
https://www.readbyqxmd.com/read/28638715/rat-intersubjective-decisions-are-encoded-by-frequency-specific-oscillatory-contexts
#3
Jana Schaich Borg, Sanvesh Srivastava, Lizhen Lin, Joseph Heffner, David Dunson, Kafui Dzirasa, Luis de Lecea
INTRODUCTION: It is unknown how the brain coordinates decisions to withstand personal costs in order to prevent other individuals' distress. Here we test whether local field potential (LFP) oscillations between brain regions create "neural contexts" that select specific brain functions and encode the outcomes of these types of intersubjective decisions. METHODS: Rats participated in an "Intersubjective Avoidance Test" (IAT) that tested rats' willingness to enter an innately aversive chamber to prevent another rat from getting shocked...
June 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28638334/frontal-theta-dynamics-during-response-conflict-in-long-term-mindfulness-meditators
#4
Han-Gue Jo, Peter Malinowski, Stefan Schmidt
Mindfulness meditators often show greater efficiency in resolving response conflicts than non-meditators. However, the neural mechanisms underlying the improved behavioral efficiency are unclear. Here, we investigated frontal theta dynamics-a neural mechanism involved in cognitive control processes-in long-term mindfulness meditators. The dynamics of EEG theta oscillations (4-8 Hz) recorded over the medial frontal cortex (MFC) were examined in terms of their power (MFC theta power) and their functional connectivity with other brain areas (the MFC-centered theta network)...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28632774/short-term-eeg-dynamics-and-neural-generators-evoked-by-navigational-images
#5
Axelle Leroy, Carlos Cevallos, Ana-Maria Cebolla, Stéphanie Caharel, Bernard Dan, Guy Cheron
The ecological environment offered by virtual reality is primarily supported by visual information. The different image contents and their rhythmic presentation imply specific bottom-up and top-down processing. Because these processes already occur during passive observation we studied the brain responses evoked by the presentation of specific 3D virtual tunnels with respect to 2D checkerboard. For this, we characterized electroencephalograhy dynamics (EEG), the evoked potentials and related neural generators involved in various visual paradigms...
2017: PloS One
https://www.readbyqxmd.com/read/28626018/dissecting-the-function-of-hippocampal-oscillations-in-a-human-anxiety-model
#6
Saurabh Khemka, Gareth Barnes, Raymond J Dolan, Dominik R Bach
Neural oscillations in hippocampus and medial prefrontal cortex (mPFC) are a hallmark of rodent anxiety models that build on conflict between approach and avoidance. Yet, the function of these oscillations, and their expression in humans, remain elusive. Here, we used magnetoencephalography (MEG) to investigate neural oscillations in a task that simulated approach-avoidance conflict, wherein 23 male and female human participants collected monetary tokens under a threat of virtual predation. Probability of threat was learned beforehand by direct experience...
June 16, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28611600/changes-in-alpha-frequency-and-power-of-the-electroencephalogram-during-volatile-based-general-anesthesia
#7
Darren Hight, Logan J Voss, Paul S Garcia, Jamie Sleigh
Oscillations in the electroencephalogram (EEG) at the alpha frequency (8-12 Hz) are thought to be ubiquitous during surgical anesthesia, but the details of how this oscillation responds to ongoing changes in volatile anesthetic concentration have not been well characterized. It is not known how often alpha oscillations are absent in the clinical context, how sensitively alpha frequency and power respond to changes in anesthetic concentration, and what effect increased age has on alpha frequency. Bipolar EEG was recorded frontally from 305 patients undergoing surgery with sevoflurane or desflurane providing general anesthesia...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/28608960/theta-band-power-increases-in-the-posterior-hippocampus-predict-successful-episodic-memory-encoding-in-humans
#8
Jui Jui Lin, Michael Rugg, Sandhitsu Das, Joel Stein, Daniel Rizzuto, Michael Kahana, Bradley Lega
Functional differences in the anterior and posterior hippocampus during episodic memory processing have not been examined in human electrophysiological data. This is in spite of strong evidence for such differences in rodent data, including greater place cell specificity in the dorsal hippocampus, greater sensitivity to the aversive or motivational content of memories in ventral regions, connectivity analyses identifying preferential ventral hippocampal connections with the amygdala, and gene expression analyses identifying a dorsal-ventral gradient...
June 13, 2017: Hippocampus
https://www.readbyqxmd.com/read/28602658/bidirectional-frontoparietal-oscillatory-systems-support-working-memory
#9
Elizabeth L Johnson, Callum D Dewar, Anne-Kristin Solbakk, Tor Endestad, Torstein R Meling, Robert T Knight
The ability to represent and select information in working memory provides the neurobiological infrastructure for human cognition. For 80 years, dominant views of working memory have focused on the key role of prefrontal cortex (PFC) [1-8]. However, more recent work has implicated posterior cortical regions [9-12], suggesting that PFC engagement during working memory is dependent on the degree of executive demand. We provide evidence from neurological patients with discrete PFC damage that challenges the dominant models attributing working memory to PFC-dependent systems...
June 19, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28591796/histamine-enhances-theta-coupled-spiking-and-gamma-oscillations-in-the-medial-entorhinal-cortex-consistent-with-successful-spatial-recognition
#10
Quanhui Chen, Fenlan Luo, Faguo Yue, Jianxia Xia, Qin Xiao, Xiang Liao, Jun Jiang, Jun Zhang, Bo Hu, Dong Gao, Chao He, Zhian Hu
Encoding of spatial information in the superficial layers of the medial entorhinal cortex (sMEC) involves theta-modulated spiking and gamma oscillations, as well as spatially tuned grid cells and border cells. Little is known about the role of the arousal-promoting histaminergic system in the modification of information encoded in the sMEC in vivo, and how such histamine-regulated information correlates with behavioral functions. Here, we show that histamine upregulates the neural excitability of a significant proportion of neurons (16...
June 7, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28588364/extinction-of-contextual-fear-with-timed-exposure-to-enriched-environment-a-differential-effect
#11
Preethi Hegde, Shane O'Mara, Thenkanidiyoor Rao Laxmi
BACKGROUND: Extinction of fear memory depends on the environmental and emotional cues. Furthermore, consolidation of extinction is also dependent on the environmental exposure. But, the relationship of the time of the exposure to a variety of environmental cues is not well known. The important region involved in facilitation of extinction of fear memory is through diversion of the flow of information leaving the lateral nucleus of amygdala. PURPOSE: The study aimed to address a question to explain how these brain regions react to environmental stimulation during the retention and extinction of fear memory...
May 2017: Annals of Neurosciences
https://www.readbyqxmd.com/read/28585018/resting-state-theta-beta-eeg-ratio-is-associated-with-reward-and-punishment-related-reversal-learning
#12
Iris Schutte, J Leon Kenemans, Dennis J L G Schutter
Prior research has shown that the ratio between resting-state theta (4-7 Hz)-beta (13-30 Hz) oscillations in the electroencephalogram (EEG) is associated with reward- and punishment-related feedback learning and risky decision making. However, it remains unclear whether the theta/beta EEG ratio is also an electrophysiological index for poorer behavioral adaptation when reward and punishment contingencies change over time. The aim of the present study was to investigate whether resting-state theta (4-7 Hz)-beta (13-30 Hz) EEG ratio correlated with reversal learning...
June 5, 2017: Cognitive, Affective & Behavioral Neuroscience
https://www.readbyqxmd.com/read/28579945/lfp-oscillations-in-the-mesencephalic-locomotor-region-during-voluntary-locomotion
#13
Brian R Noga, Francisco J Sanchez, Luz M Villamil, Christopher O'Toole, Stefan Kasicki, Maciej Olszewski, Anna M Cabaj, Henryk Majczyński, Urszula Sławińska, Larry M Jordan
Oscillatory rhythms in local field potentials (LFPs) are thought to coherently bind cooperating neuronal ensembles to produce behaviors, including locomotion. LFPs recorded from sites that trigger locomotion have been used as a basis for identification of appropriate targets for deep brain stimulation (DBS) to enhance locomotor recovery in patients with gait disorders. Theta band activity (6-12 Hz) is associated with locomotor activity in locomotion-inducing sites in the hypothalamus and in the hippocampus, but the LFPs that occur in the functionally defined mesencephalic locomotor region (MLR) during locomotion have not been determined...
2017: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/28579129/theta-gamma-coupling-in-hippocampus-during-working-memory-deficits-induced-by-low-frequency-electromagnetic-field-exposure
#14
Yameng Zhang, Yan Zhang, Hejuan Yu, Yamin Yang, Weitao Li, Zhiyu Qian
The dramatically increased use of electricity is raising major concerns as to the consequences of the interaction between electromagnetic field (EMF) and neurobiology. The aim of this study is to investigate the effects of magnetic field on working memory in the hippocampal region by analyzing local field potentials (LFPs) and spikes pattern in vivo. In present study, mice were exposed to EMF (50Hz, 1mT), static magnetic field (SMF, 1mT), or placed in the exposure tube but without EMF exposure (SHAM), respectively...
June 1, 2017: Physiology & Behavior
https://www.readbyqxmd.com/read/28573679/bidirectional-electric-communication-between-the-inferior-occipital-gyrus-and-the-amygdala-during-face-processing
#15
Wataru Sato, Takanori Kochiyama, Shota Uono, Kazumi Matsuda, Keiko Usui, Naotaka Usui, Yushi Inoue, Motomi Toichi
Faces contain multifaceted information that is important for human communication. Neuroimaging studies have revealed face-specific activation in multiple brain regions, including the inferior occipital gyrus (IOG) and amygdala; it is often assumed that these regions constitute the neural network responsible for the processing of faces. However, it remains unknown whether and how these brain regions transmit information during face processing. This study investigated these questions by applying dynamic causal modeling of induced responses to human intracranial electroencephalography data recorded from the IOG and amygdala during the observation of faces, mosaics, and houses in upright and inverted orientations...
June 2, 2017: Human Brain Mapping
https://www.readbyqxmd.com/read/28562642/enhancement-of-multitasking-performance-and-neural-oscillations-by-transcranial-alternating-current-stimulation
#16
Wan-Yu Hsu, Theodore P Zanto, Martine R van Schouwenburg, Adam Gazzaley
Multitasking is associated with the generation of stimulus-locked theta (4-7 Hz) oscillations arising from prefrontal cortex (PFC). Transcranial alternating current stimulation (tACS) is a non-invasive brain stimulation technique that influences endogenous brain oscillations. Here, we investigate whether applying alternating current stimulation within the theta frequency band would affect multitasking performance, and explore tACS effects on neurophysiological measures. Brief runs of bilateral PFC theta-tACS were applied while participants were engaged in a multitasking paradigm accompanied by electroencephalography (EEG) data collection...
2017: PloS One
https://www.readbyqxmd.com/read/28559797/regulation-of-the-hippocampal-network-by-vglut3-positive-cck-gabaergic-basket-cells
#17
Caroline Fasano, Jill Rocchetti, Katarzyna Pietrajtis, Johannes-Friedrich Zander, Frédéric Manseau, Diana Y Sakae, Maya Marcus-Sells, Lauriane Ramet, Lydie J Morel, Damien Carrel, Sylvie Dumas, Susanne Bolte, Véronique Bernard, Erika Vigneault, Romain Goutagny, Gudrun Ahnert-Hilger, Bruno Giros, Stéphanie Daumas, Sylvain Williams, Salah El Mestikawy
Hippocampal interneurons release the inhibitory transmitter GABA to regulate excitation, rhythm generation and synaptic plasticity. A subpopulation of GABAergic basket cells co-expresses the GABA/glycine vesicular transporters (VIAAT) and the atypical type III vesicular glutamate transporter (VGLUT3); therefore, these cells have the ability to signal with both GABA and glutamate. GABAergic transmission by basket cells has been extensively characterized but nothing is known about the functional implications of VGLUT3-dependent glutamate released by these cells...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28559582/thalamic-bursts-down-regulate-cortical-theta-and-nociceptive-behavior
#18
Brian W LeBlanc, Brent Cross, Kelsey A Smith, Catherine Roach, Jimmy Xia, Yu-Chieh Chao, Joshua Levitt, Suguru Koyama, Christopher I Moore, Carl Y Saab
We tested the relation between pain behavior, theta (4-8 Hz) oscillations in somatosensory cortex and burst firing in thalamic neurons in vivo. Optically-induced thalamic bursts attenuated cortical theta and mechanical allodynia. It is proposed that thalamic bursts are an adaptive response to pain that de-synchronizes cortical theta and decreases sensory salience.
May 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28553215/eeg-cortical-connectivity-analysis-of-working-memory-reveals-topological-reorganization-in-theta-and-alpha-bands
#19
Zhongxiang Dai, Joshua de Souza, Julian Lim, Paul M Ho, Yu Chen, Junhua Li, Nitish Thakor, Anastasios Bezerianos, Yu Sun
Numerous studies have revealed various working memory (WM)-related brain activities that originate from various cortical regions and oscillate at different frequencies. However, multi-frequency band analysis of the brain network in WM in the cortical space remains largely unexplored. In this study, we employed a graph theoretical framework to characterize the topological properties of the brain functional network in the theta and alpha frequency bands during WM tasks. Twenty-eight subjects performed visual n-back tasks at two difficulty levels, i...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28542644/pre-target-neural-oscillations-predict-variability-in-the-detection-of-small-pitch-changes
#20
Esther Florin, Dominique Vuvan, Isabelle Peretz, Sylvain Baillet
Pitch discrimination is important for language or music processing. Previous studies indicate that auditory perception depends on pre-target neural activity. However, so far the pre-target electrophysiological conditions which enable the detection of small pitch changes are not well studied, but might yield important insights into pitch-processing. We used magnetoencephalography (MEG) source imaging to reveal the pre-target effects of successful auditory detection of small pitch deviations from a sequence of standard tones...
2017: PloS One
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