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https://www.readbyqxmd.com/read/28626018/dissecting-the-function-of-hippocampal-oscillations-in-a-human-anxiety-model
#1
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/28621693/abnormalities-of-cortical-neural-synchronization-mechanisms-in-subjects-with-mild-cognitive-impairment-due-to-alzheimer-s-and-parkinson-s-diseases-an-eeg-study
#2
Claudio Babiloni, Claudio Del Percio, Roberta Lizio, Giuseppe Noce, Susanna Cordone, Susanna Lopez, Andrea Soricelli, Raffaele Ferri, Maria Teresa Pascarelli, Flavio Nobili, Dario Arnaldi, Francesco Famà, Dag Aarsland, Francesco Orzi, Carla Buttinelli, Franco Giubilei, Marco Onofrj, Fabrizio Stocchi, Paola Stirpe, Peter Fuhr, Ute Gschwandtner, Gerhard Ransmayr, Georg Caravias, Heinrich Garn, Fabiola Sorpresi, Michela Pievani, Fabrizia D'Antonio, Carlo De Lena, Bahar Güntekin, Lutfu Hanoğlu, Erol Başar, Görsev Yener, Derya Durusu Emek-Savaş, Antonio Ivano Triggiani, Raffaella Franciotti, Giovanni B Frisoni, Laura Bonanni, Maria Francesca De Pandis
The aim of this retrospective and exploratory study was that the cortical sources of resting state eyes-closed electroencephalographic (rsEEG) rhythms might reveal different abnormalities in cortical neural synchronization in groups of patients with mild cognitive impairment due to Alzheimer's disease (ADMCI) and Parkinson's disease (PDMCI) as compared to healthy subjects. Clinical and rsEEG data of 75 ADMCI, 75 PDMCI, and 75 cognitively normal elderly (Nold) subjects were available in an international archive...
June 10, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28611603/inactivation-of-the-lateral-entorhinal-area-increases-the-influence-of-visual-cues-on-hippocampal-place-cell-activity
#3
Kristin M Scaplen, Rohan N Ramesh, Negin Nadvar, Omar J Ahmed, Rebecca D Burwell
The hippocampus is important for both navigation and associative learning. We previously showed that the hippocampus processes two-dimensional (2D) landmarks and objects differently. Our findings suggested that landmarks are more likely to be used for orientation and navigation, whereas objects are more likely to be used for associative learning. The process by which cues are recognized as relevant for navigation or associative learning, however, is an open question. Presumably both spatial and nonspatial information are necessary for classifying cues as landmarks or objects...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/28579945/lfp-oscillations-in-the-mesencephalic-locomotor-region-during-voluntary-locomotion
#4
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/28559797/regulation-of-the-hippocampal-network-by-vglut3-positive-cck-gabaergic-basket-cells
#5
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/28558154/theta-paced-flickering-between-place-cell-maps-in-the-hippocampus-a-model-based-on-short-term-synaptic-plasticity
#6
Shirley Mark, Sandro Romani, Karel Jezek, Misha Tsodyks
Hippocampal place cells represent different environments with distinct neural activity patterns. Following an abrupt switch between two familiar configurations of visual cues defining two environments, the hippocampal neural activity pattern switches almost immediately to the corresponding representation. Surprisingly, during a transient period following the switch to the new environment, occasional fast transitions of activity patterns between the representations (flickering) were observed (Jezek et al. 2011)...
May 30, 2017: Hippocampus
https://www.readbyqxmd.com/read/28555100/the-impact-of-monaural-beat-stimulation-on-anxiety-and-cognition
#7
Leila Chaieb, Elke C Wilpert, Christian Hoppe, Nikolai Axmacher, Juergen Fell
Application of auditory beat stimulation has been speculated to provide a promising new tool with which to alleviate symptoms of anxiety and to enhance cognition. In spite of reportedly similar EEG effects of binaural and monaural beats, data on behavioral effects of monaural beats are still lacking. Therefore, we examined the impact of monaural beat stimulation on anxiety, mood and memory performance. We aimed to target states related to anxiety levels and general well-being, in addition to long-term and working memory processes, using monaural beats within the range of main cortical rhythms...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28550254/precuneus-failures-in-subjects-of-the-psen1-e280a-family-at-risk-of-developing-alzheimer-s-disease-detected-using-quantitative-electroencephalography
#8
John Fredy Ochoa, Joan Francesc Alonso, Jon Edinson Duque, Carlos Andrés Tobón, Ana Baena, Francisco Lopera, Miguel Angel Mañanas, Alher Mauricio Hernández
BACKGROUND: Presenilin-1 (PSEN1) mutations are the most common cause of familial early onset Alzheimer's disease (AD). The PSEN1 E280A (E280A) mutation has an autosomal dominant inheritance and is involved in the production of amyloid-β. The largest family group of carriers with E280A mutation is found in Antioquia, Colombia. The study of mutation carriers provides a unique opportunity to identify brain changes in stages previous to AD. Electroencephalography (EEG) is a low cost and minimally invasiveness technique that enables the following of brain changes in AD...
May 26, 2017: Journal of Alzheimer's Disease: JAD
https://www.readbyqxmd.com/read/28548460/internally-generated-hippocampal-sequences-as-a-vantage-point-to-probe-future-oriented-cognition
#9
REVIEW
Giovanni Pezzulo, Caleb Kemere, Matthijs A A van der Meer
Information processing in the rodent hippocampus is fundamentally shaped by internally generated sequences (IGSs), expressed during two different network states: theta sequences, which repeat and reset at the ∼8 Hz theta rhythm associated with active behavior, and punctate sharp wave-ripple (SWR) sequences associated with wakeful rest or slow-wave sleep. A potpourri of diverse functional roles has been proposed for these IGSs, resulting in a fragmented conceptual landscape. Here, we advance a unitary view of IGSs, proposing that they reflect an inferential process that samples a policy from the animal's generative model, supported by hippocampus-specific priors...
May 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28542392/acute-exercise-does-not-modify-brain-activity-and-memory-performance-in-app-ps1-mice
#10
Angelica Miki Stein, Victor Munive, Ana M Fernandez, Angel Nuñez, Ignacio Torres Aleman
Age is the main risk factor for Alzheimer´s disease (AD). With an increasingly aging population, development of affordable screening techniques to determine cognitive status will help identify population-at-risk for further follow-up. Because physical exercise is known to modulate cognitive performance, we used it as a functional test of cognitive health. Mice were submitted to treadmill running at moderate speed for 30 min, and their brain activity was monitored before and after exercise using electrocorticogram (ECG) recordings...
2017: PloS One
https://www.readbyqxmd.com/read/28496406/neural-correlates-of-phrase-rhythm-an-eeg-study-of-bipartite-vs-rondo-sonata-form
#11
Arturo Martínez-Rodrigo, Alicia Fernández-Sotos, José Miguel Latorre, José Moncho-Bogani, Antonio Fernández-Caballero
This paper introduces the neural correlates of phrase rhythm. In short, phrase rhythm is the rhythmic aspect of phrase construction and the relationships between phrases. For the sake of establishing the neural correlates, a musical experiment has been designed to induce music-evoked stimuli related to phrase rhythm. Brain activity is monitored through electroencephalography (EEG) by using a brain-computer interface. The power spectral value of each EEG channel is estimated to obtain how power variance distributes as a function of frequency...
2017: Frontiers in Neuroinformatics
https://www.readbyqxmd.com/read/28454845/abnormalities-of-cortical-neural-synchronization-mechanisms-in-patients-with-dementia-due-to-alzheimer-s-and-lewy-body-diseases-an-eeg-study
#12
Claudio Babiloni, Claudio Del Percio, Roberta Lizio, Giuseppe Noce, Susanna Cordone, Susanna Lopez, Andrea Soricelli, Raffaele Ferri, Maria Teresa Pascarelli, Flavio Nobili, Dario Arnaldi, Dag Aarsland, Francesco Orzi, Carla Buttinelli, Franco Giubilei, Marco Onofrj, Fabrizio Stocchi, Paola Stirpe, Peter Fuhr, Ute Gschwandtner, Gerhard Ransmayr, Georg Caravias, Heinrich Garn, Fabiola Sorpresi, Michela Pievani, Giovanni B Frisoni, Fabrizia D'Antonio, Carlo De Lena, Bahar Güntekin, Lutfu Hanoğlu, Erol Başar, Görsev Yener, Derya Durusu Emek-Savaş, Antonio Ivano Triggiani, Raffaella Franciotti, Maria Francesca De Pandis, Laura Bonanni
The aim of this retrospective exploratory study was that resting state eyes-closed electroencephalographic (rsEEG) rhythms might reflect brain arousal in patients with dementia due to Alzheimer's disease dementia (ADD), Parkinson's disease dementia (PDD), and dementia with Lewy body (DLB). Clinical and rsEEG data of 42 ADD, 42 PDD, 34 DLB, and 40 healthy elderly (Nold) subjects were available in an international archive. Demography, education, and Mini-Mental State Evaluation score were not different between the patient groups...
April 5, 2017: Neurobiology of Aging
https://www.readbyqxmd.com/read/28399098/-eeg-spectral-characteristics-during-heart-rate-variability-biofeedback-in-healthy-people
#13
D B Demin, L V Poskotinova
AIM: To evaluate changes in electroencephalogram (EEG) spectral characteristics during a single session of heart rate variability biofeedback (HRV BF). MATERIAL AND METHODS: One hundred and fifty adolescents, aged 16-17 years, were studied. Adolescents of the BF-group (n=110) conducted HRV BF session to enhance vagal influences on the heart rhythm. Adolescents of the control group (n=40) remained in relaxed resting state. EEG was recorded with eyes closed before and after BF training...
2017: Zhurnal Nevrologii i Psikhiatrii Imeni S.S. Korsakova
https://www.readbyqxmd.com/read/28396622/transcranial-magnetic-stimulation-reveals-intrinsic-perceptual-and-attentional-rhythms
#14
REVIEW
Laura Dugué, Rufin VanRullen
Oscillatory brain activity has functional relevance for perceptual and cognitive processes, as proven by numerous electrophysiology studies accumulating over the years. However, only within the past two decades have researchers been able to study the causal role of such oscillations using transcranial magnetic stimulation (TMS) technology. Two complementary approaches exist. A majority of research employs rhythmic TMS (rTMS) to entrain oscillatory activity and investigate its effect on targeted brain functions...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28396398/selective-entrainment-of-gamma-subbands-by-different-slow-network-oscillations
#15
Weiwei Zhong, Mareva Ciatipis, Thérèse Wolfenstetter, Jakob Jessberger, Carola Müller, Simon Ponsel, Yevgenij Yanovsky, Jurij Brankačk, Adriano B L Tort, Andreas Draguhn
Theta oscillations (4-12 Hz) are thought to provide a common temporal reference for the exchange of information among distant brain networks. On the other hand, faster gamma-frequency oscillations (30-160 Hz) nested within theta cycles are believed to underlie local information processing. Whether oscillatory coupling between global and local oscillations, as showcased by theta-gamma coupling, is a general coding mechanism remains unknown. Here, we investigated two different patterns of oscillatory network activity, theta and respiration-induced network rhythms, in four brain regions of freely moving mice: olfactory bulb (OB), prelimbic cortex (PLC), parietal cortex (PAC), and dorsal hippocampus [cornu ammonis 1 (CA1)]...
April 25, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28382759/development-of-infant-sustained-attention-and-its-relation-to-eeg-oscillations-an-eeg-and-cortical-source-analysis-study
#16
Wanze Xie, Brittany M Mallin, John E Richards
The current study examined the relation between infant sustained attention and infant EEG oscillations. Fifty-nine infants were tested at 6 (N = 15), 8 (N = 17), 10 (N = 14), and 12 (N = 13) months. Three attention phases, stimulus orienting, sustained attention, and attention termination, were defined based on infants' heart rate changes. Frequency analysis using simultaneously recorded EEG focused on infant theta (2-6 Hz), alpha (6-9 Hz), and beta (9-14 Hz) rhythms. Cortical source analysis of EEG oscillations was conducted with realistic infant MRI models...
April 5, 2017: Developmental Science
https://www.readbyqxmd.com/read/28349959/organization-of-prefrontal-network-activity-by-respiration-related-oscillations
#17
Jonatan Biskamp, Marlene Bartos, Jonas-Frederic Sauer
The medial prefrontal cortex (mPFC) integrates information from cortical and sub-cortical areas and contributes to the planning and initiation of behaviour. A potential mechanism for signal integration in the mPFC lies in the synchronization of neuronal discharges by theta (6-12 Hz) activity patterns. Here we show, using in vivo local field potential (LFP) and single-unit recordings from awake mice, that prominent oscillations in the sub-theta frequency band (1-5 Hz) emerge during awake immobility in the mPFC...
March 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28349227/effects-of-bilateral-vestibular-deafferentation-in-rat-on-hippocampal-theta-response-to-somatosensory-stimulation-acetylcholine-release-and-cholinergic-neurons-in-the-pedunculopontine-tegmental-nucleus
#18
Phillip Aitken, Yiwen Zheng, Paul F Smith
Vestibular dysfunction has been shown to cause spatial memory impairment. Neurophysiological studies indicate that bilateral vestibular loss (BVL), in particular, is associated with an impairment of the response of hippocampal place cells and theta rhythm. However, the specific neural pathways through which vestibular information reaches the hippocampus are yet to be fully elucidated. The aim of the present study was to further investigate the hypothesised 'theta-generating pathway' from the brainstem vestibular nucleus to the hippocampus...
March 27, 2017: Brain Structure & Function
https://www.readbyqxmd.com/read/28348646/complexity-of-resting-state-eeg-activity-in-the-patients-with-early-stage-parkinson-s-disease
#19
Guo-Sheng Yi, Jiang Wang, Bin Deng, Xi-Le Wei
To investigate the abnormal brain activities in the early stage of Parkinson's disease (PD), the electroencephalogram (EEG) signals were recorded with 20 channels from non-dementia PD patients (18 patients, 8 females) and age matched healthy controls (18 subjects, 8 females) during the resting state. Two methods based on the ordinal patterns of the recorded series, i.e., permutation entropy (PE) and order index (OI), were introduced to characterize the complexity of the cortical activities for two groups. It was observed that the resting-state EEG of PD patients showed lower PE and higher OI than healthy controls, which indicated that the early-stage PD caused the reduced complexity of EEG...
April 2017: Cognitive Neurodynamics
https://www.readbyqxmd.com/read/28337126/competition-between-persistent-na-and-muscarine-sensitive-k-currents-shapes-perithreshold-resonance-and-spike-tuning-in-ca1-pyramidal-neurons
#20
Jorge Vera, Julio Alcayaga, Magdalena Sanhueza
Neurons from many brain regions display intrinsic subthreshold theta-resonance, responding preferentially to theta-frequency oscillatory stimuli. Resonance may contribute to selective communication among neurons and to orchestrate brain rhythms. CA1 pyramidal neurons receive theta activity, generating place fields. In these neurons the expression of perithreshold frequency preference is controversial, particularly in the spiking regime, with evidence favoring either non-resonant (integrator-like) or resonant behavior...
2017: Frontiers in Cellular Neuroscience
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