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https://www.readbyqxmd.com/read/29473165/neural-oscillations-in-the-infralimbic-cortex-after-electrical-stimulation-of-the-amygdala-relevance-to-acute-stress-processing
#1
Aina Luque-García, Vicent Teruel-Martí, Sergio Martínez-Bellver, Albert Adell, Ana Cervera-Ferri, Joana Martínez-Ricós
The stress system coordinates the adaptive reactions of the organism to stressors. So, dysfunctions in this circuit may correlate to anxiety-related disorders, including depression. Comprehending the dynamics of this network may lead to a better understanding of the mechanisms that underlie these diseases. The central nucleus of the amygdala (CeA) activates the hypothalamic-pituitary-adrenal axis and brainstem nodes by triggering endocrine, autonomic and behavioural stress responses. The medial prefrontal cortex plays a significant role in regulating reactions to stressors, and is specifically important for limiting fear responses...
February 23, 2018: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/29462702/cell-type-specific-intrinsic-perithreshold-oscillations-in-hippocampal-gabaergic-interneurons
#2
Young-Jin Kang, Hannah Elisabeth Smashey Lewis, Mason William Young, Gubbi Govindaiah, Lazar John Greenfield, Edgar Garcia-Rill, Sang-Hun Lee
The hippocampus plays a critical role in learning, memory, and spatial processing through coordinated network activity including theta and gamma oscillations. Recent evidence suggests that hippocampal subregions (e.g., CA1) can generate these oscillations at the network level, at least in part, through GABAergic interneurons. However, it is unclear whether specific GABAergic interneurons generate intrinsic theta and/or gamma oscillations at the single cell level. Since major types of CA1 interneurons (i.e., parvalbumin-positive basket cells (PVBCs), cannabinoid type 1 receptor-positive basket cells (CB1 BCs), Schaffer collateral-associated cells (SCAs), neurogliaform cells and ivy cells) are thought to play key roles in network theta and gamma oscillations in the hippocampus, we tested the hypothesis that these cells generate intrinsic perithreshold oscillations at the single cell level...
February 17, 2018: Neuroscience
https://www.readbyqxmd.com/read/29460990/beta-gamma-burst-stimulations-of-the-inferior-olive-induce-high-frequency-oscillations-in-the-deep-cerebellar-nuclei
#3
Julian Cheron, Guy Cheron
The cerebellum displays various sorts of rhythmic activities covering both low and high-frequency oscillations. These cerebellar high-frequency oscillations were observed in the cerebellar cortex. Here, we hypothesized that not only is the cerebellar cortex a generator of high-frequency oscillations but that the deep cerebellar nuclei may also play a similar role. Thus, we analysed local field potentials and single unit activities in the deep cerebellar nuclei before, during and after electric stimulation in the inferior olive of awake mice...
February 20, 2018: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29459369/the-nucleus-reuniens-controls-long-range-hippocampo-prefrontal-gamma-synchronization-during-slow-oscillations
#4
Maëva Ferraris, Antoine Ghestem, Ana F Vicente, Lauriane Nallet-Khosrofian, Christophe Bernard, Pascale P Quilichini
Gamma oscillations are involved in long-range coupling of distant regions which support various cognitive operations. Here we show in adult male rats that synchronized bursts of gamma oscillations bind the hippocampus (HPC) and prefrontal cortex (mPFC) during slow oscillations and slow wave sleep, a brain state that is central for consolidation of memory traces. These gamma bursts entrained the firing of the local HPC and mPFC neuronal populations. Neurons of the nucleus reuniens (NR), which is a structural and functional hub between HPC and mPFC, demonstrated a specific increase in their firing prior to gamma burst onset, suggesting their involvement in HPC-mPFC binding...
February 19, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29458058/lithium-modulates-the-muscarinic-facilitation-of-synaptic-plasticity-and-theta-gamma-coupling-in-the-hippocampal-prefrontal-pathway
#5
Rafael N Ruggiero, Matheus T Rossignoli, Cleiton Lopes-Aguiar, João P Leite, Lezio S Bueno-Junior, Rodrigo N Romcy-Pereira
Mood disorders are associated to functional unbalance in mesolimbic and frontal cortical circuits. As a commonly used mood stabilizer, lithium acts through multiple biochemical pathways, including those activated by muscarinic cholinergic receptors crucial for hippocampal-prefrontal communication. Therefore, here we investigated the effects of lithium on prefrontal cortex responses under cholinergic drive. Lithium-treated rats were anesthetized with urethane and implanted with a ventricular cannula for muscarinic activation, a recording electrode in the medial prefrontal cortex (mPFC), and a stimulating electrode in the intermediate hippocampal CA1...
February 16, 2018: Experimental Neurology
https://www.readbyqxmd.com/read/29453207/hippocampal-ripple-oscillations-and-inhibition-first-network-models-frequency-dynamics-and-response-to-gaba-modulators
#6
José R Donoso, Dietmar Schmitz, Nikolaus Maier, Richard Kempter
Hippocampal ripples are involved in memory consolidation, but the mechanisms underlying their generation remain unclear. Models relying on interneuron networks in the CA1 region disagree on the predominant source of excitation to interneurons: either 'direct', via the Schaffer collaterals that provide feedforward input from CA3 to CA1, or 'indirect', via the local pyramidal cells in CA1, which are embedded in a recurrent excitatory-inhibitory network. Here, we used physiologically constrained computational models of basket-cell networks to investigate how they respond to different conditions of transient, noisy excitation...
February 16, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29449429/heterogeneous-origins-of-human-sleep-spindles-in-different-cortical-layers
#7
Donald J Hagler, Istvan Ulbert, Lucia Wittner, Lorand Erőss, Joseph R Madsen, Orrin Devinsky, Werner Doyle, Daniel Fabo, Sydney S Cash, Eric Halgren
Sleep spindles are a cardinal feature in human NREM sleep and may be important for memory consolidation. We studied the intracortical organization of spindles in men and women by recording spontaneous sleep spindles from different cortical layers using linear microelectrode arrays. Two patterns of spindle generation were identified using visual inspection, and confirmed with factor analysis. Spindles (10-16Hz) were largest and most common in upper and middle channels, with limited involvement of deep channels...
February 15, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29448391/relationship-between-the-mechanisms-of-gamma-rhythm-generation-and-the-magnitude-of-the-macroscopic-phase-response-function-in-a-population-of-excitatory-and-inhibitory-modified-quadratic-integrate-and-fire-neurons
#8
Akihiko Akao, Yutaro Ogawa, Yasuhiko Jimbo, G Bard Ermentrout, Kiyoshi Kotani
Gamma oscillations are thought to play an important role in brain function. Interneuron gamma (ING) and pyramidal interneuron gamma (PING) mechanisms have been proposed as generation mechanisms for these oscillations. However, the relation between the generation mechanisms and the dynamical properties of the gamma oscillation are still unclear. Among the dynamical properties of the gamma oscillation, the phase response function (PRF) is important because it encodes the response of the oscillation to inputs...
January 2018: Physical Review. E
https://www.readbyqxmd.com/read/29440388/large-visual-stimuli-induce-two-distinct-gamma-oscillations-in-primate-visual-cortex
#9
D V P S Murty, Vinay Shirhatti, Poojya Ravishankar, Supratim Ray
Recent studies have shown the existence of two gamma rhythms in the hippocampus subserving different functions, but to date, primate studies in primary visual cortex have reported a single gamma rhythm. Here we show that large visual stimuli induce a slow gamma (25-45 Hz) in area V1 of two awake adult female bonnet monkeys and in the electroencephalogram of 15 human subjects (7 males and 8 females), in addition to the traditionally known fast gamma (45-70 Hz). The two rhythms had different tuning characteristics for stimulus orientation, contrast, drift speed and size...
February 9, 2018: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29438778/gamma-oscillations-in-the-entorhinal-hippocampal-circuit-underlying-memory-and-dementia
#10
REVIEW
Tomoaki Nakazono, Heechul Jun, Mathew Blurton-Jones, Kim N Green, Kei M Igarashi
Gamma oscillations that occur within the entorhinal cortex-hippocampal circuitry play important roles in the formation and retrieval of memory in healthy brains. Recent studies report that gamma oscillations are impaired in the entorhinal-hippocampal circuit of Alzheimer's disease (AD) patients and AD animal models. Here we review the latest advancements in studies of entorhinal-hippocampal gamma oscillations in healthy memory and dementia. This review is especially salient for readers in Alzheimer's research field not familiar with in vivo electrophysiology...
February 10, 2018: Neuroscience Research
https://www.readbyqxmd.com/read/29430585/dendritic-cell-factor-1-knockout-results-in-visual-deficit-through-the-gaba-system-in-mouse-primary-visual-cortex
#11
Jieyun Shi, Qian Li, Tieqiao Wen
The visual system plays an important role in our daily life. In this study, we found that loss of dendritic cell factor 1 (DCF1) in the primary visual cortex (V1) caused a sight deficit in mice and induced an abnormal increase in glutamic acid decarboxylase 67, an enzyme that catalyzes the decarboxylation of glutamate to gamma aminobutyric acid and CO2, particularly in layer 5. In vivo electrophysiological recordings confirmed a decrease in delta, theta, and beta oscillation power in DCF1-knockout mice. This study presents a previously unknown function of DCF1 in V1, suggests an unknown contact between DCF1 and GABA systems, and provides insight into the mechanism and treatment of visual deficits...
February 12, 2018: Neuroscience Bulletin
https://www.readbyqxmd.com/read/29429805/respiration-entrained-brain-rhythms-are-global-but-often-overlooked
#12
REVIEW
Adriano B L Tort, Jurij Brankačk, Andreas Draguhn
We revisit recent evidence showing that nasal respiration entrains oscillations at the same frequency as breathing in several regions of the rodent brain. Moreover, respiration modulates the amplitude of a specific gamma sub-band (70-120Hz), most prominently in frontal regions. Since rodents often breathe at delta and theta frequencies, we caution that previous studies on delta and theta power and their cross-regional synchrony, as well as on delta-gamma and theta-gamma coupling, may have detected the respiration-entrained rhythm and respiration-gamma coupling...
February 8, 2018: Trends in Neurosciences
https://www.readbyqxmd.com/read/29426859/evoked-and-oscillatory-eeg-activity-differentiates-language-discrimination-in-young-monolingual-and-bilingual-infants
#13
Loreto Nacar Garcia, Carlos Guerrero-Mosquera, Marc Colomer, Nuria Sebastian-Galles
Language discrimination is one of the core differences between bilingual and monolingual language acquisition. Here, we investigate the earliest brain specialization induced by it. Following previous research, we hypothesize that bilingual native language discrimination is a complex process involving specific processing of the prosodic properties of the speech signal. We recorded the brain activity of monolingual and bilingual 4.5-month-old infants using EEG, while listening to their native/dominant language and two foreign languages...
February 9, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29425897/the-dynamics-of-human-cognition-increasing-global-integration-coupled-with-decreasing-segregation-found-using-ieeg
#14
Josephine Cruzat, Gustavo Deco, Adrià Tauste Campo, Alessandro Principe, Albert Costa, Morten L Kringelbach, Rodrigo Rocamora
Cognitive processing requires the ability to flexibly integrate and process information across large brain networks. How do brain networks dynamically reorganize to allow broad communication between many different brain regions in order to integrate information? We record neural activity from 12 epileptic patients using intracranial EEG while performing three cognitive tasks. We assess how the functional connectivity between different brain areas changes to facilitate communication across them. At the topological level, this facilitation is characterized by measures of integration and segregation...
February 6, 2018: NeuroImage
https://www.readbyqxmd.com/read/29420934/vigilance-associated-gamma-oscillations-coordinate-the-ensemble-activity-of-basolateral-amygdala-neurons
#15
Alon Amir, Drew B Headley, Seung-Chan Lee, Darrell Haufler, Denis Paré
Principal basolateral amygdala (BL) neurons profoundly influence motivated behaviors, yet few of them are activated by emotionally valenced stimuli. Here, we show that a likely explanation for this paradox is the synchronizing influence of the high-gamma rhythm. High-gamma (75-95 Hz) entrained BL firing more strongly than all other rhythms. It was most pronounced during states of increased vigilance, when rats were apprehensive. Relative to behavioral states, high-gamma produced minor changes in firing rates yet dramatic increases in synchrony...
February 7, 2018: Neuron
https://www.readbyqxmd.com/read/29419668/disordered-high-frequency-oscillation-in-face-processing-in-schizophrenia-patients
#16
Miaomiao Liu, Guangying Pei, Yinuo Peng, Changming Wang, Tianyi Yan, Jinglong Wu
Schizophrenia is a complex disorder characterized by marked social dysfunctions, but the neural mechanism underlying this deficit is unknown. To investigate whether face-specific perceptual processes are influenced in schizophrenia patients, both face detection and configural analysis were assessed in normal individuals and schizophrenia patients by recording electroencephalogram (EEG) data. Here, a face processing model was built based on the frequency oscillations, and the evoked power (theta, alpha, and beta bands) and the induced power (gamma bands) were recorded while the subjects passively viewed face and nonface images presented in upright and inverted orientations...
February 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29410010/notch1-knockdown-disturbed-neural-oscillations-in-the-hippocampus-of-c57bl-mice
#17
Qun Li, Xiaochen Zhang, Ning Cheng, Chunxiao Yang, Tao Zhang
Neural oscillations and their interactions are associated with the coordination of neural groups, which provide a mechanism underlying information processing of brain functions. Notch1 receptor is involved in the neurological and psychiatric disorders, such as neurodevelopmental deficits, cerebral ischemia, Alzheimer's disease and depression. Here, we investigated the dynamics of neural oscillations in hippocampus of Notch1+/- mice in urethane-anesthetized state. Notch1 knockdown altered the distribution of power in the hippocampal DG areas, reduced theta (3-8 Hz) power and enhanced low gamma (LG, 30-50 Hz) and high gamma (HG, 50-100 Hz) power...
February 1, 2018: Progress in Neuro-psychopharmacology & Biological Psychiatry
https://www.readbyqxmd.com/read/29403359/horizontal-synchronization-of-neuronal-activity-in-the-barrel-cortex-of-the-neonatal-rat-by-spindle-burst-oscillations
#18
Dmitrii Suchkov, Lyaila Sharipzyanova, Marat Minlebaev
During development, activity in the somatosensory cortex is characterized by intermittent oscillatory bursts at gamma (early gamma-oscillations, EGOs) and alpha-beta (spindle-bursts, SBs) frequencies. Here, we explored the topography of EGOs and SBs in the neighbor barrels of the whisker-related barrel cortex of neonatal rats (P4-7) during responses evoked by simultaneous activation of multiple whiskers as it occurs during natural conditions. We found that brief simultaneous deflection of all whiskers evoked complex neuronal responses comprised of EGOs and SBs...
2018: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/29397081/phase-amplitude-coupling-of-the-electroencephalogram-in-the-auditory-cortex-in-schizophrenia
#19
Shogo Hirano, Alexander Nakhnikian, Yoji Hirano, Naoya Oribe, Shigenobu Kanba, Toshiaki Onitsuka, Margaret Levin, Kevin M Spencer
BACKGROUND: Cross-frequency interactions may coordinate neural circuits operating at different frequencies. While neural oscillations associated with particular circuits in schizophrenia (SZ) are impaired, few studies have examined cross-frequency interactions. Here we examined phase-amplitude coupling (PAC) in the electroencephalograms of individuals with SZ and healthy control subjects (HCs). We computed PAC during the baseline period of 40-Hz auditory steady-state stimulation and rest...
January 2018: Biological Psychiatry: Cognitive Neuroscience and Neuroimaging
https://www.readbyqxmd.com/read/29395662/detection-of-fast-40-150%C3%A2-hz-oscillations-from-the-ictal-scalp-eeg-data-of-myoclonic-seizures-in-pediatric-patients
#20
Katsuhiro Kobayashi, Yuji Ohuchi, Takashi Shibata, Yoshiyuki Hanaoka, Mari Akiyama, Makio Oka, Fumika Endoh, Tomoyuki Akiyama
OBJECTIVE: We explored fast (40-150 Hz) oscillations (FOs) from the ictal scalp electroencephalogram (EEG) data of myoclonic seizures in pediatric patients to obtain insight into the pathophysiological mechanisms involved in the generation of myoclonic seizures. SUBJECTS AND METHODS: The participants were 21 children (11 boys, 10 girls; age ranging from 5 months to 17 years 2 months) with myoclonic seizures associated with generalized (poly)spike-wave bursts in the ictal EEG data...
January 30, 2018: Brain & Development
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