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Theta oscillation

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https://www.readbyqxmd.com/read/29778070/high-intensity-binge-drinking-is-associated-with-alterations-in-spontaneous-neural-oscillations-in-young-adults
#1
Rifqi O Affan, Siyuan Huang, Stephen M Cruz, Lee A Holcomb, Edward Nguyen, Ksenija Marinkovic
Heavy episodic alcohol consumption (also termed binge drinking) contributes to a wide range of health and cognitive deficits, but the associated brain-based indices are poorly understood. The current study used electroencephalography (EEG) to examine spontaneous neural oscillations in young adults as a function of quantity, frequency, and the pattern of their alcohol consumption. Sixty-one young adults (23.4 ± 3.4 years of age) were assigned to binge drinking (BD) and light drinking (LD) groups that were equated on gender, race/ethnic identity, age, educational background, and family history of alcoholism...
January 8, 2018: Alcohol
https://www.readbyqxmd.com/read/29773984/midfrontal-theta-and-posterior-parietal-alpha-band-oscillations-support-conflict-resolution-in-a-masked-affective-priming-task
#2
Jun Jiang, Kira Bailey, Xiao Xiao
Past attempts to characterize the neural mechanisms of affective priming have conceptualized it in terms of classic cognitive conflict, but have not examined the neural oscillatory mechanisms of subliminal affective priming. Using behavioral and electroencephalogram (EEG) time frequency (TF) analysis, the current study examines the oscillatory dynamics of unconsciously triggered conflict in an emotional facial expressions version of the masked affective priming task. The results demonstrate that the power dynamics of conflict are characterized by increased midfrontal theta activity and suppressed parieto-occipital alpha activity...
2018: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29773755/expectations-do-not-alter-early-sensory-processing-during-perceptual-decision-making
#3
Nuttida Rungratsameetaweemana, Sirawaj Itthipuripat, Annalisa Salazar, John T Serences
Two factors play an important role in shaping perception: the allocation of selective attention to behaviorally relevant sensory features, and prior expectations about regularities in the environment. Signal detection theory proposes distinct roles of attention and expectation on decision-making such that attention modulates early sensory processing whereas expectation influences the selection and execution of motor responses. Challenging this classic framework, recent studies suggest that expectations about sensory regularities enhance the encoding and accumulation of sensory evidence during decision-making...
May 17, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29772381/high-gamma-activity-in-the-human-hippocampus-and-parahippocampus-during-inter-trial-rest-periods-of-a-virtual-navigation-task
#4
Yi Pu, Brian R Cornwell, Douglas Cheyne, Blake W Johnson
In rodents, hippocampal cell assemblies formed during learning of a navigation task are observed to re-emerge during resting (offline) periods, accompanied by high-frequency oscillations (HFOs). This phenomenon is believed to reflect mechanisms for strengthening newly-formed memory traces. Using magnetoencephalography recordings and a beamforming source location algorithm (synthetic aperture magnetometry), we investigated high-gamma (80-140 Hz) oscillations in the hippocampal region in 18 human participants during inter-trial rest periods in a virtual navigation task...
May 14, 2018: NeuroImage
https://www.readbyqxmd.com/read/29766764/local-cortical-activity-of-distant-brain-areas-can-phase-lock-to-the-olfactory-bulb-s-respiratory-rhythm-in-the-freely-behaving-rat
#5
Daniel Rojas-Líbano, Jonathan Wimmer Del Solar, Marcelo Aguilar-Rivera, Rodrigo Montefusco-Siegmund, Pedro Esteban Maldonado
An important unresolved question about neural processing is the mechanism by which distant brain areas coordinate their activities and relate their local processing to global neural events. A potential candidate for the local-global integration are slow rhythms such as respiration. In this article, we asked if there are modulations of local cortical processing which are phase-locked to (peripheral) sensory-motor exploratory rhythms. We studied rats on an elevated platform where they would spontaneously display exploratory and rest behaviors...
May 16, 2018: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29766458/cerebellar-stimulation-evoked-prefrontal-electrical-synchrony-is-modulated-by-gaba
#6
Xiaoming Du, Laura M Rowland, Ann Summerfelt, Fow-Sen Choa, George F Wittenberg, Krista Wisner, Andrea Wijtenburg, Joshua Chiappelli, Peter Kochunov, L Elliot Hong
Cerebellar-prefrontal connectivity has been recognized as important for behaviors ranging from motor coordination to cognition. Many of these behaviors are known to involve excitatory or inhibitory modulations from the prefrontal cortex. We used cerebellar transcranial magnetic stimulation (TMS) with simultaneous electroencephalography (EEG) to probe cerebellar-evoked electrical activity in prefrontal cortical areas and used magnetic resonance spectroscopy (MRS) measures of prefrontal GABA and glutamate levels to determine if they are correlated with those potentials...
May 15, 2018: Cerebellum
https://www.readbyqxmd.com/read/29762768/emergence-of-mature-cortical-activity-in-wakefulness-and-sleep-in-healthy-pre-term-and-full-term-infants
#7
Kimberley Whitehead, Pureza Laudiano-Dray, Judith Meek, Lorenzo Fabrizi
Study Objectives: Cortical activity patterns develop rapidly over the equivalent of the last trimester of gestation, in parallel with the establishment of sleep architecture. However, the emergence of mature cortical activity in wakefulness compared to sleep states in healthy pre-term infants is poorly understood. Methods: To investigate whether cortical activity has a different developmental profile in each sleep-wake state, we recorded 11-channels EEG, EOG and respiratory movement for one hour from 115 infants 34-43 weeks corrected age, with 0...
May 14, 2018: Sleep
https://www.readbyqxmd.com/read/29753784/theta-oscillations-promote-temporal-sequence-learning
#8
Jordan Crivelli-Decker, Liang-Tien Hsieh, Alex Clarke, Charan Ranganath
Many theoretical models suggest that neural oscillations play a role in learning or retrieval of temporal sequences, but the extent to which oscillations support sequence representation remains unclear. To address this question, we used scalp electroencephalography (EEG) to examine oscillatory activity over learning of different object sequences. Participants made semantic decisions on each object as they were presented in a continuous stream. For three "Consistent" sequences, the order of the objects was always fixed...
May 10, 2018: Neurobiology of Learning and Memory
https://www.readbyqxmd.com/read/29747149/the-analysis-of-eeg-coherence-reflects-middle-childhood-differences-in-mathematical-achievement
#9
Andrés A González-Garrido, Fabiola R Gómez-Velázquez, Ricardo A Salido-Ruiz, Aurora Espinoza-Valdez, Hugo Vélez-Pérez, Rebeca Romo-Vazquez, Geisa B Gallardo-Moreno, Vanessa D Ruiz-Stovel, Alicia Martínez-Ramos, Gustavo Berumen
Symbolic numerical magnitude processing is crucial to arithmetic development, and it is thought to be supported by the functional activation of several brain-interconnected structures. In this context, EEG beta oscillations have been recently associated with attention and working memory processing that underlie math achievement. Due to that EEG coherence represents a useful measure of brain functional connectivity, we aimed to contrast the EEG coherence in forty 8-to-9-year-old children with different math skill levels (High: HA, and Low achievement: LA) according to their arithmetic scores in the Fourth Edition of the Wide Range Achievement Test (WRAT-4) while performing a symbolic magnitude comparison task (i...
May 7, 2018: Brain and Cognition
https://www.readbyqxmd.com/read/29746907/oscillatory-networks-of-high-level-mental-alignment-a-perspective-taking-meg-study
#10
R A Seymour, H Wang, G Rippon, K Kessler
Mentally imagining another's perspective is a high-level social process, reliant on manipulating internal representations of the self in an embodied manner. Recently Wang et al. (2016) showed that theta-band (3-7Hz) brain oscillations within the right temporo-parietal junction (rTPJ) and brain regions coding for motor/body schema contribute to the process of perspective-taking. Using a similar paradigm, we set out to unravel the extended functional brain network in detail. Increasing the angle between self and other perspective was accompanied by longer reaction times and increases in theta power within rTPJ, right lateral pre-frontal cortex (PFC) and right anterior cingulate cortex (ACC)...
May 7, 2018: NeuroImage
https://www.readbyqxmd.com/read/29742457/some-technical-issues-of-vagal-nerve-stimulation-an-approach-using-a-hippocampal-formation-theta-rhythm
#11
Adam Broncel, Renata Bocian, Paulina Kłos-Wojtczak, Jan Konopacki
Previously, we have demonstrated that hippocampal (HPC) theta rhythm can be produced, depending on current intensity, directly during vagal nerve stimulation (VNS) or with a time delay following stimulation. This suggests that theta EEG pattern can also be used as a bio-indicator of the efficiency of VNS. In the present study, we focused on three specific, technical issues related to the stimulation procedure of the vagal nerve: i/does the type of the electrode used for VNS and the technique of its implantation affect the parameters of the HPC theta rhythm? ii/does the type of electrode used determine the current intensity threshold of VNS-induced HPC theta? iii/is the repeatability of the VNS effect determined by the type of electrode used? We demonstrated that a platinum-iridium cuff electrode offers some important advantages over a tungsten electrode...
May 6, 2018: Brain Research Bulletin
https://www.readbyqxmd.com/read/29727632/the-oscillatory-boundary-conditions-of-different-frequency-bands-in-parkinson-s-disease
#12
Bing Hu, Qianqian Shi, Yu Guo, Xiyezi Diao, Heng Guo, Jinsong Zhang, Liang Yu, Hao Dai, Luonan Chen
Parkinson's disease (PD) is a neurodegenerative disease that is common in the elderly population. The most important pathological change in PD is the degeneration and death of dopaminergic neurons in the substantia nigra of the midbrain, which results in a decrease in the dopamine (DA) content of the striatum. The exact cause of this pathological change is still unknown. Numerous studies have shown that the evolution of PD is associated with abnormal oscillatory activities in the basal ganglia, with different oscillation frequency ranges, such as the typical beta band (13-30 Hz), the alpha band (8-12 Hz), the theta band (4-7 Hz) and the delta band (1-3 Hz)...
May 1, 2018: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/29718802/degeneracy-in-the-robust-expression-of-spectral-selectivity-subthreshold-oscillations-and-intrinsic-excitability-of-entorhinal-stellate-cells
#13
Divyansh Mittal, Rishikesh Narayanan
Biological heterogeneities are ubiquitous and play critical roles in the emergence of physiology at multiple scales. Although neurons in layer II (LII) of the medial entorhinal cortex (MEC) express heterogeneities in channel properties, the impact of such heterogeneities on the robustness of their cellular-scale physiology has not been assessed. Here, we performed a 55-parameter stochastic search spanning 9 voltage- or calcium-activated channels to assess the impact of channel heterogeneities on the concomitant emergence of 10 in vitro electrophysiological characteristics of LII stellate cells (SCs)...
May 2, 2018: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29713274/theta-gamma-coupling-and-working-memory-in-alzheimer-s-dementia-and-mild-cognitive-impairment
#14
Michelle S Goodman, Sanjeev Kumar, Reza Zomorrodi, Zaid Ghazala, Amay S M Cheam, Mera S Barr, Zafiris J Daskalakis, Daniel M Blumberger, Corinne Fischer, Alastair Flint, Linda Mah, Nathan Herrmann, Christopher R Bowie, Benoit H Mulsant, Tarek K Rajji
Working memory deficits are common among individuals with Alzheimer's dementia (AD) or mild cognitive impairment (MCI). Yet, little is known about the mechanisms underlying these deficits. Theta-gamma coupling-the modulation of high-frequency gamma oscillations by low-frequency theta oscillations-is a neurophysiologic process underlying working memory. We assessed the relationship between theta-gamma coupling and working memory deficits in AD and MCI. We hypothesized that: (1) individuals with AD would display the most significant working memory impairments followed by MCI and finally healthy control (HC) participants; and (2) there would be a significant association between working memory performance and theta-gamma coupling across all participants...
2018: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/29700906/endogenously-generated-gamma-band-oscillations-in-early-visual-cortex-a-neurofeedback-study
#15
Nina Merkel, Michael Wibral, Gareth Bland, Wolf Singer
Human subjects were trained with neurofeedback (NFB) to enhance the power of narrow-band gamma oscillations in circumscribed regions of early visual cortex. To select the region and the oscillation frequency for NFB training, gamma oscillations were induced with locally presented drifting gratings. The source and frequency of these induced oscillations were determined using beamforming methods. During NFB training the power of narrow band gamma oscillations was continuously extracted from this source with online beamforming and converted into the pitch of a tone signal...
April 26, 2018: Human Brain Mapping
https://www.readbyqxmd.com/read/29695951/dynamic-neural-state-identification-in-deep-brain-local-field-potentials-of-neuropathic-pain
#16
Huichun Luo, Yongzhi Huang, Xueying Du, Yunpeng Zhang, Alexander L Green, Tipu Z Aziz, Shouyan Wang
In neuropathic pain, the neurophysiological and neuropathological function of the ventro-posterolateral nucleus of the thalamus (VPL) and the periventricular gray/periaqueductal gray area (PVAG) involves multiple frequency oscillations. Moreover, oscillations related to pain perception and modulation change dynamically over time. Fluctuations in these neural oscillations reflect the dynamic neural states of the nucleus. In this study, an approach to classifying the synchronization level was developed to dynamically identify the neural states...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29691421/parallel-detection-of-theta-and-respiration-coupled-oscillations-throughout-the-mouse-brain
#17
Adriano B L Tort, Simon Ponsel, Jakob Jessberger, Yevgenij Yanovsky, Jurij Brankačk, Andreas Draguhn
Slow brain oscillations are usually coherent over long distances and thought to link distributed cell assemblies. In mice, theta (5-10 Hz) stands as one of the most studied slow rhythms. However, mice often breathe at theta frequency, and we recently reported that nasal respiration leads to local field potential (LFP) oscillations that are independent of theta. Namely, we showed respiration-coupled oscillations in the hippocampus, prelimbic cortex, and parietal cortex, suggesting that respiration could impose a global brain rhythm...
April 24, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29689342/electroencephalogram-oscillations-support-the-involvement-of-task-unrelated-thoughts-in-the-mechanism-of-boredom-a-pilot-study
#18
Eri Miyauchi, Masahiro Kawasaki
Boredom is a universal experience; however, the neural mechanisms underlying the phenomenon remain unclear. Previous research suggests that boredom is related to attentional failure and derives a possible explanation for the cognitive processes of boredom as a product of appraisals made about task-unrelated thoughts. There are little published data regarding proposed processes from neuroscientific perspectives. Therefore, the authors aimed to examine whether cognitive processes of boredom with task-unrelated thoughts followed by appraisals of them can be explained by examining oscillatory correlates...
April 21, 2018: Neuroscience Letters
https://www.readbyqxmd.com/read/29682758/dissociation-of-frontal-midline-delta-theta-and-posterior-alpha-oscillations-a-mobile-eeg-study
#19
Mingli Liang, Michael J Starrett, Arne D Ekstrom
Numerous reports have demonstrated low-frequency oscillations during navigation using invasive recordings in the hippocampus of both rats and human patients. Given evidence, in some cases, of low-frequency synchronization between midline cortex and hippocampus, it is also possible that low-frequency movement-related oscillations manifest in healthy human neocortex. However, this possibility remains largely unexplored, in part due to the difficulties of coupling free ambulation and effective scalp EEG recordings...
April 22, 2018: Psychophysiology
https://www.readbyqxmd.com/read/29680786/strengthened-functional-connectivity-among-lfps-in-rat-medial-prefrontal-cortex-during-anxiety
#20
Jun Lu, Haoran Dong, Xuyuan Zheng
Theta oscillations in medial prefrontal cortex (mPFC) have been consistently implicated in the regulation of anxiety-related behaviors. However, the theta-band functional connectivity in mPFC is less well characterized. Therefore, we simultaneously recorded local filed potentials (LFPs) from mPFC in freely behaving rats in the elevated plus maze (EPM). Functional connectivity among LFPs was measured by directed transfer function (DTF) via spectral Granger causal connectivity analysis. Causal network was then identified based on DTF...
April 19, 2018: Behavioural Brain Research
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