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https://www.readbyqxmd.com/read/28729826/sleep-dependent-oscillatory-synchronization-a-role-in-fear-memory-consolidation
#1
Michael S Totty, Logan A Chesney, Phillip A Geist, Subimal Datta
Sleep plays an important role in memory consolidation through the facilitation of neuronal plasticity; however, how sleep accomplishes this remains to be completely understood. It has previously been demonstrated that neural oscillations are an intrinsic mechanism by which the brain precisely controls neural ensembles. Inter-regional synchronization of these oscillations is also known to facilitate long-range communication and long-term potentiation (LTP). In the present study, we investigated how the characteristic rhythms found in local field potentials (LFPs) during non-REM and REM sleep play a role in emotional memory consolidation...
2017: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/28729443/theta-and-beta-band-neural-activity-reflect-independent-syllable-tracking-and-comprehension-of-time-compressed-speech
#2
Maria Pefkou, Luc H Arnal, Lorenzo Fontolan, Anne-Lise Giraud
Recent psychophysics data suggest that speech perception is not limited by the capacity of the auditory system to encode fast acoustic variations through neural gamma activity, but rather by the time given to the brain to decode them. Whether the decoding process is bounded by the capacity of theta rhythm to follow speech syllabic rhythm, or constrained by a more endogenous top-down mechanism, e.g. involving beta activity, is unknown. We addressed the dynamics of auditory decoding in speech comprehension by challenging syllable tracking and speech decoding using comprehensible and incomprehensible time-compressed auditory sentences...
July 20, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28729438/electrophysiological-evidence-that-the-retrosplenial-cortex-displays-a-strong-and-specific-activation-phased-with-hippocampal-theta-during-paradoxical-rem-sleep
#3
Koike Bruna Del Vechio, Farias Kelly Soares, Billwiller Francesca, Almeida-Filho Daniel, Libourel Paul-Antoine, Tiran-Cappello Alix, Parmentier Régis, Blanco Wilfredo, Ribeiro Sidarta, Luppi Pierre-Herve, Queiroz Claudio Marcos
It is widely accepted that cortical neurons are similarly more activated during waking and paradoxical sleep (PS, aka REM) than during slow wave sleep (SWS). However, we recently reported using Fos labeling that only a few limbic cortical structures including the retrosplenial (RSC) and anterior cingulate (ACA) cortices contain a large number of neurons activated during PS hypersomnia. Our aim in the present study was to record local field potentials (LFPs) and unit activity from these two structures across all vigilance states in freely moving male rats to determine whether the RSC and the ACA are electrophysiologically specifically active during basal PS episodes...
July 20, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28701912/brain-responses-to-a-6-hz-binaural-beat-effects-on-general-theta-rhythm-and-frontal-midline-theta-activity
#4
Nantawachara Jirakittayakorn, Yodchanan Wongsawat
A binaural beat is a beat phenomenon that is generated by the dichotic presentation of two almost equivalent pure tones but with slightly different frequencies. The brain responses to binaural beats remain controversial; therefore, the aim of this study was to investigate theta activity responses to a binaural beat by controlling factors affecting localization, including beat frequency, carrier tone frequency, exposure duration, and recording procedure. Exposure to a 6-Hz binaural beat on a 250 Hz carrier tone for 30 min was utilized in this study...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28688548/eeg-activity-as-an-objective-measure-of-cognitive-load-during-effortful-listening-a-study-on-pediatric-subjects-with-bilateral-asymmetric-sensorineural-hearing-loss
#5
Pasquale Marsella, Alessandro Scorpecci, Giulia Cartocci, Sara Giannantonio, Anton Giulio Maglione, Isotta Venuti, Ambra Brizi, Fabio Babiloni
OBJECTIVES: Deaf subjects with hearing aids or cochlear implants generally find it challenging to understand speech in noisy environments where a great deal of listening effort and cognitive load are invested. In prelingually deaf children, such difficulties may have detrimental consequences on the learning process and, later in life, on academic performance. Despite the importance of such a topic, currently, there is no validated test for the assessment of cognitive load during audiological tasks...
August 2017: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/28675996/ongoing-electroencephalographic-activity-associated-with-cortical-arousal-in-transgenic-pdapp-mice-happ-v717f
#6
Claudio Del Percio, Wilhelmus Drinkenburg, Susanna Lopez, Cristina Limatola, Jesper F Bastlund, Ditte Zerlang Christensen, Jan T Pedersen, Gianluigi Forloni, Angelisa Frasca, Francesco M Noè, Marina Bentivoglio, Paolo F Fabene, Giuseppe Bertini, Valeria Colavito, Sophie Dix, Raffaele Ferri, Regis Bordet, Jill C Richardso, Claudio Babiloni
BACKGROUND: It has been shown that theta (6-10 Hz) and delta (1-6 Hz) ongoing electroencephalographic (EEG) rhythms revealed variations in the cortical arousal in C57 Wild Type (WT) mice during cage exploration (active condition) compared to awake quiet behavior (passive condition; IMI PharmaCog project, www.pharmacog.eu). OBJECTIVE: Test if these EEG rhythms might be abnormal in old PDAPP mice modeling Alzheimer's disease (AD) with a hAPP Indiana V717F mutation (They show abnormal neural transmission, cognitive deficits, and brain accumulation of Aβ1-42)...
July 4, 2017: Current Alzheimer Research
https://www.readbyqxmd.com/read/28673309/abnormal-circadian-oscillation-of-hippocampal-mapk-activity-and-power-spectrums-in-nf1-mutant-mice
#7
Lei Chen, Tatiana Serdyuk, Beimeng Yang, Shuai Wang, Shiqing Chen, Xixia Chu, Xu Zhang, Jinjing Song, Hechen Bao, Chengbin Zhou, Xiang Wang, Shuangle Dong, Lulu Song, Fujun Chen, Guang He, Lin He, Ying Zhou, Weidong Li
Studies have implied that the circadian oscillation of mitogen-activated protein kinase (MAPK) signal pathways is crucial for hippocampus-dependent memory. NF1 mouse models (Nf1 heterozygous null mutants; Nf1 (+/-)) displayed enhanced MAPK activity in the hippocampus and resulted in memory deficits. We assumed a link between MAPK pathways and hippocampal rhythmic oscillations, which have never been explored in Nf1 (+/-) mice. We demonstrated that the level of extracellular signal-regulated kinases 1 and 2 (ERK1/2) phosphorylation in Nf1 (+/-) mice were significantly higher at nighttime than at daytime...
July 3, 2017: Molecular Brain
https://www.readbyqxmd.com/read/28659769/propofol-sevoflurane-and-ketamine-induce-a-reversible-increase-in-delta-gamma-and-theta-gamma-phase-amplitude-coupling-in-frontal-cortex-of-rat
#8
Dinesh Pal, Brian H Silverstein, Lana Sharba, Duan Li, Viviane S Hambrecht-Wiedbusch, Anthony G Hudetz, George A Mashour
Studies from human and non-human species have demonstrated a breakdown of functional corticocortical connectivity during general anesthesia induced by anesthetics with diverse molecular, neurophysiological, and pharmacological profiles. Recent studies have demonstrated that changes in long-range neural communication, and by corollary, functional connectivity, might be influenced by cross-frequency coupling (CFC) between the phase of slow oscillations and the amplitude of local fast oscillations. Phase-amplitude coupling (PAC) between slow oscillations and alpha rhythm during general anesthesia reveal distinct patterns depending on the anesthetic...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/28653279/chronic-paroxetine-treatment-prevents-the-emergence-of-abnormal-electroencephalogram-oscillations-in-huntington-s-disease-mice
#9
Sandor Kantor, Janos Varga, Shreya Kulkarni, A Jennifer Morton
Disturbance of rapid eye movement (REM) sleep appears early in both patients with Huntington's disease (HD) and mouse models of HD. Selective serotonin reuptake inhibitors are widely prescribed for patients with HD, and are also known to suppress REM sleep in healthy subjects. To test whether selective serotonin reuptake inhibitors can correct abnormal REM sleep and sleep-dependent brain oscillations in HD mice, we treated wild-type and symptomatic R6/2 mice acutely with vehicle and paroxetine (5, 10, and 20 mg/kg)...
June 26, 2017: Neurotherapeutics: the Journal of the American Society for Experimental NeuroTherapeutics
https://www.readbyqxmd.com/read/28626018/dissecting-the-function-of-hippocampal-oscillations-in-a-human-anxiety-model
#10
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 signaled by color and learned beforehand by direct experience...
July 19, 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
#11
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...
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
#12
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
#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/28559797/regulation-of-the-hippocampal-network-by-vglut3-positive-cck-gabaergic-basket-cells
#14
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
#15
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
#16
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
#17
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...
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
#18
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
#19
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
#20
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
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