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Alpha Oscillations

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https://www.readbyqxmd.com/read/28087359/the-effect-of-nmda-r-antagonism-on-simultaneously-acquired-local-field-potentials-and-tissue-oxygen-levels-in-the-brains-of-freely-moving-rats
#1
John Kealy, Sean Commins, John P Lowry
Non-competitive NMDA receptor antagonists are known to induce psychosis-like symptoms in rodents. Administration of such compounds cause behavioural effects such as memory impairment and hyperlocomotion. Additionally, drugs such as phencyclidine (PCP), ketamine and MK-801 all cause distinctive increases in striatal local field potential (LFP) in the high frequency oscillation (HFO) band in the power spectrum (140-180 Hz). Amperometric sensors provide a means to measure tissue oxygen (tO2; a BOLD-like signal) in the brains of freely-moving rats while simultaneously acquiring LFP using the same electrode...
January 10, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28077711/phase-amplitude-coupling-and-long-range-phase-synchronization-reveal-frontotemporal-interactions-during-visual-working-memory
#2
Jonathan Daume, Thomas Gruber, Andreas K Engel, Uwe Friese
: It has been suggested that cross-frequency phase-amplitude coupling (PAC), particularly in temporal brain structures, serves as a neural mechanism for coordinated working memory storage. In this magnetoencephalography study, we show that during visual working memory maintenance, temporal cortex regions, which exhibit enhanced PAC, interact with prefrontal cortex via enhanced low-frequency phase synchronization. Healthy human participants were engaged in a visual delayed match-to-sample task with pictures of natural objects...
January 11, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28077669/preparatory-alpha-band-oscillations-reflect-spatial-gating-independently-of-predictions-regarding-target-identity
#3
Theresa Wildegger, Freek van Ede, Mark W Woolrich, Celine R Gillebert, Anna Christina Nobre
Preparatory modulations of cortical alpha-band oscillations are a reliable index of the voluntary allocation of covert spatial attention. It is currently unclear whether attentional cues containing information about a target's identity (such as its visual orientation), in addition to its location, might additionally shape preparatory alpha modulations. Here, we explore this question by directly comparing spatial and feature-based attention in the same visual detection task while recording brain activity using magneto-encephalography (MEG)...
January 11, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28069918/posterior-alpha-eeg-dynamics-dissociate-current-from-future-goals-in-working-memory-guided-visual-search
#4
Ingmar E J de Vries, Joram van Driel, Christian N L Olivers
: Current models of visual search assume that search is guided by an active visual working memory representation of what we are currently looking for. This attentional template for currently relevant stimuli can be dissociated from accessory memory representations that are only needed prospectively, for a future task, and that should be prevented from guiding current attention. However, it remains unclear what electrophysiological mechanisms dissociate currently relevant (serving upcoming selection) from prospectively relevant memories (serving future selection)...
January 9, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28069543/brain-oscillations-differentially-encode-noxious-stimulus-intensity-and-pain-intensity
#5
Moritz M Nickel, Elisabeth S May, Laura Tiemann, Paul Schmidt, Martina Postorino, Son Ta Dinh, Joachim Gross, Markus Ploner
Noxious stimuli induce physiological processes which commonly translate into pain. However, under certain conditions, pain intensity can substantially dissociate from stimulus intensity, e.g. during longer-lasting pain in chronic pain syndromes. How stimulus intensity and pain intensity are differentially represented in the human brain is, however, not yet fully understood. We therefore used electroencephalography (EEG) to investigate the cerebral representation of noxious stimulus intensity and pain intensity during 10minutes of painful heat stimulation in 39 healthy human participants...
January 6, 2017: NeuroImage
https://www.readbyqxmd.com/read/28063948/cytokine-il-10-activators-of-pi3-kinase-agonists-of-%C3%AE-2-adrenoreceptor-and-antioxidants-prevent-ischemia-induced-cell-death-in-rat-hippocampal-cultures
#6
Egor A Turovsky, Maria V Turovskaya, Sergei G Gaidin, Valery P Zinchenko
In the present work we compared the protective effect of anti-inflammatory cytokine IL-10 with the action of a PI3-kinase selective activator 740 Y-P, selective agonists of alpha-2 adrenoreceptor, guanfacine and UK-14,304, and compounds having antioxidant effect: recombinant human peroxiredoxin 6 and B27, in hippocampal cell culture during OGD (ischemia-like conditions). It has been shown that the response of cells to OGD in the control includes two phases. The first phase was accompanied by an increase in the frequency of spontaneous synchronous Ca(2+)-oscillations (SSCO) in neurons and Ca(2+)-pulse in astrocytes...
January 4, 2017: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28057978/evidence-against-solar-influence-on-nuclear-decay-constants
#7
S Pommé, H Stroh, J Paepen, R Van Ammel, M Marouli, T Altzitzoglou, M Hult, K Kossert, O Nähle, H Schrader, F Juget, C Bailat, Y Nedjadi, F Bochud, T Buchillier, C Michotte, S Courte, M W van Rooy, M J van Staden, J Lubbe, B R S Simpson, A Fazio, P De Felice, T W Jackson, W M Van Wyngaardt, M I Reinhard, J Golya, S Bourke, T Roy, R Galea, J D Keightley, K M Ferreira, S M Collins, A Ceccatelli, M Unterweger, R Fitzgerald, D E Bergeron, L Pibida, L Verheyen, M Bruggeman, B Vodenik, M Korun, V Chisté, M-N Amiot
The hypothesis that proximity to the Sun causes variation of decay constants at permille level has been tested and disproved. Repeated activity measurements of mono-radionuclide sources were performed over periods from 200 days up to four decades at 14 laboratories across the globe. Residuals from the exponential nuclear decay curves were inspected for annual oscillations. Systematic deviations from a purely exponential decay curve differ from one data set to another and are attributable to instabilities in the instrumentation and measurement conditions...
October 2016: Physics Letters. [Part B]
https://www.readbyqxmd.com/read/28045083/pulsation-limited-oxygen-diffusion-in-the-tumour-microenvironment
#8
Edoardo Milotti, Sabrina Stella, Roberto Chignola
Hypoxia is central to tumour evolution, growth, invasion and metastasis. Mathematical models of hypoxia based on reaction-diffusion equations provide seemingly incomplete descriptions as they fail to predict the measured oxygen concentrations in the tumour microenvironment. In an attempt to explain the discrepancies, we consider both the inhomogeneous distribution of oxygen-consuming cells in solid tumours and the dynamics of blood flow in the tumour microcirculation. We find that the low-frequency oscillations play an important role in the establishment of tumour hypoxia...
January 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28041948/pre-stimulus-alpha-oscillations-over-somatosensory-cortex-predict-tactile-misperceptions
#9
Matt Craddock, Ellen Poliakoff, Wael El-Deredy, Ekaterini Klepousniotou, Donna M Lloyd
Fluctuations of pre-stimulus oscillatory activity in the somatosensory alpha band (8-14Hz) observed using human EEG and MEG have been shown to influence the detection of supra- and peri-threshold somatosensory stimuli. However, some reports of touch occur even without a stimulus. We investigated the possibility that pre-stimulus alpha oscillations might also influence these false reports of touch - known as tactile misperceptions. We recorded EEG while participants performed the Somatic Signal Detection Task (SSDT), in which participants must detect brief, peri-threshold somatosensory targets...
December 29, 2016: Neuropsychologia
https://www.readbyqxmd.com/read/28039860/a-right-ear-bias-of-auditory-selective-attention-is-evident-in-alpha-oscillations
#10
Lisa Payne, Chad S Rogers, Arthur Wingfield, Robert Sekuler
Auditory selective attention makes it possible to pick out one speech stream that is embedded in a multispeaker environment. We adapted a cued dichotic listening task to examine suppression of a speech stream lateralized to the nonattended ear, and to evaluate the effects of attention on the right ear's well-known advantage in the perception of linguistic stimuli. After being cued to attend to input from either their left or right ear, participants heard two different four-word streams presented simultaneously to the separate ears...
December 31, 2016: Psychophysiology
https://www.readbyqxmd.com/read/28017779/electroencephalographic-frontal-synchrony-and-caudal-asynchrony-during-painful-hand-immersion-in-cold-water
#11
Joshua Levitt, Hyunwoo J Choo, Kelsey A Smith, Brian W LeBlanc, Carl Y Saab
Recent studies in our laboratory showed that cortical theta oscillations correlate with pain in rodent models. In this study, we sought to validate our pre-clinical data using EEG recordings in humans during immersion of the hand in ice cold water, a moderately noxious stimulus. Power spectral analysis shows that an increase in pain score is associated with an increase in power amplitude within a frequency range of 6-7Hz at the frontal (Fz) electrode. These results are consistent with our previous pre-clinical animal studies and the clinical literature...
December 22, 2016: Brain Research Bulletin
https://www.readbyqxmd.com/read/27999125/delta-band-oscillations-in-motor-regions-predict-hand-selection-for-reaching
#12
Audrey Hamel-Thibault, François Thénault, Kevin Whittingstall, Pierre-Michel Bernier
Current models hold that action selection is achieved by competitive interactions between co-existing motor representations associated with each potential action. Critically, selection via competition requires biasing signals to enable one of these alternatives to be selected. This study tested the hypothesis that selection is related to the prestimulus excitability of neuronal ensembles in which movements are encoded, as assessed through the phase of delta-band oscillations (2-4 Hz). Electroencephalography was recorded while participants performed speeded reaches toward appearing visual targets using the hand of their choice...
December 19, 2016: Cerebral Cortex
https://www.readbyqxmd.com/read/27994016/spontaneous-neural-oscillations-bias-perception-by-modulating-baseline-excitability
#13
Luca Iemi, Maximilien Chaumon, Sébastien M Crouzet, Niko A Busch
: The brain exhibits organised fluctuations of neural activity even in the absence of tasks or sensory input. A prominent type of such spontaneous activity is the alpha rhythm, which influences perception and interacts with other ongoing neural activity. It is currently hypothesised that states of decreased prestimulus alpha oscillations indicate enhanced neural excitability, resulting in improved perceptual acuity. Nevertheless, it remains debated how changes in excitability manifest at the behavioral level in perceptual tasks...
December 19, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/27990062/electrical-activity-of-the-cerebral-cortex-during-the-low-frequency-acoustic-stimulation-in-women-with-different-characteristics-of-alpha-rhythm
#14
Alevtyna Morenko, Olena Morenko
BACKGROUND: Human functional capabilities, to a certain extent, depend on an individual's nervous system. The recording of the spontaneous electroencephalogram (EEG) makes it possible to estimate specific features of the nervous system, and in particular the activity of the human brain. PURPOSE: This study is aimed at investigating the brain in women with a high or a low individual α-frequency (ІαF), determined in a quiescent state during low-frequency acoustic stimulation...
October 2016: Annals of Neurosciences
https://www.readbyqxmd.com/read/27979693/event-related-potentials-and-neural-oscillations-dissociate-levels-of-cognitive-control
#15
Mingou Lu, Nuria Doñamayor, Thomas F Münte, Jörg Bahlmann
Recent models of human behavior suggest a hierarchical organization of cognitive control processes. These models assume that different sub-goals of cognitive control processes are nested in each other, such that higher-level sub-goals can only be accomplished when lower-level sub-goals have been realized. While the neuroanatomical localization of this organizational principle has already been successfully tested, the exact temporal nature remains to be explored. The present study applied event-related potentials (ERPs) and investigated neural oscillations during performance of three different nested cognitive control tasks...
December 12, 2016: Behavioural Brain Research
https://www.readbyqxmd.com/read/27979651/a-brief-historical-perspective-on-the-advent-of-brain-oscillations-in-the-biological-and-psychological-disciplines
#16
REVIEW
Sirel Karakaş, Robert J Barry
We aim to review the historical evolution that has led to the study of the brain (body)-mind relationship based on brain oscillations, to outline and illustrate the principles of neuro-oscillatory dynamics using research findings. The paper addresses the relevant developments in behavioral sciences after Wundt established the science of psychology, and developments in the neurosciences after alpha and gamma oscillations were discovered by Berger and Adrian, respectively. Basic neuroscientific studies have led to a number of principles: (1) spontaneous EEG is composed of a set of oscillatory components, (2) the brain responds with oscillatory activity, (3) poststimulus oscillatory activity is a function of prestimulus activity, (4) the brain response results from a superposition of oscillatory components, (5) there are multiplicities with regard to oscillations and functions, and (6) oscillations are spatially integrated...
December 12, 2016: Neuroscience and Biobehavioral Reviews
https://www.readbyqxmd.com/read/27965584/more-severe-insomnia-complaints-in-people-with-stronger-long-range-temporal-correlations-in-wake-resting-state-eeg
#17
Michele A Colombo, Yishul Wei, Jennifer R Ramautar, Klaus Linkenkaer-Hansen, Enzo Tagliazucchi, Eus J W Van Someren
The complaints of people suffering from Insomnia Disorder (ID) concern both sleep and daytime functioning. However, little is known about wake brain temporal dynamics in people with ID. We therefore assessed possible alterations in Long-Range Temporal Correlations (LRTC) in the amplitude fluctuations of band-filtered oscillations in electroencephalography (EEG) recordings. We investigated whether LRTC differ between cases with ID and matched controls. Within both groups, we moreover investigated whether individual differences in subjective insomnia complaints are associated with LRTC...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27959269/how-lateral-inhibition-and-fast-retinogeniculo-cortical-oscillations-create-vision-a-new-hypothesis
#18
Ravinder Jerath, Shannon M Cearley, Vernon A Barnes, Elizabeth Nixon-Shapiro
: The role of the physiological processes involved in human vision escapes clarification in current literature. Many unanswered questions about vision include: 1) whether there is more to lateral inhibition than previously proposed, 2) the role of the discs in rods and cones, 3) how inverted images on the retina are converted to erect images for visual perception, 4) what portion of the image formed on the retina is actually processed in the brain, 5) the reason we have an after-image with antagonistic colors, and 6) how we remember space...
November 2016: Medical Hypotheses
https://www.readbyqxmd.com/read/27951451/electroencephalographic-study-of-chlorpromazine-alone-or-combined-with-alpha-lipoic-acid-in-a-model-of-schizophrenia-induced-by-ketamine-in-rats
#19
Luis Rafael Leite Sampaio, Lucas Teixeira Nunes Borges, Talita Matias Barbosa, Natalia Castelo Branco Matos, Ricardo de Freitas Lima, Mariana Nascimento de Oliveira, Viviane Nóbrega Gularte, Manoel Cláudio Azevedo Patrocínio, Danielle Macêdo, Otoni Cardoso do Vale, Silvânia Maria Mendes de Vasconcelos
Schizophrenia is characterized by behavioral symptoms, brain function impairments and electroencephalographic (EEG) changes. Dysregulation of immune responses and oxidative imbalance underpins this mental disorder. The present study aimed to investigate the effects of the typical antipsychotic chlorpromazine (CP) alone or combined with the natural antioxidant alpha-lipoic acid (ALA) on changes in the hippocampal average spectral power induced by ketamine (KET). Three days after stereotactic implantation of electrodes, male Wistar rats were divided into groups treated for 10 days with saline (control) or KET (10 mg/kg, IP)...
December 3, 2016: Journal of Psychiatric Research
https://www.readbyqxmd.com/read/27915117/from-intentions-to-actions-neural-oscillations-encode-motor-processes-through-phase-amplitude-and-phase-amplitude-coupling
#20
Etienne Combrisson, Marcela Perrone-Bertolotti, Juan Lp Soto, Golnoush Alamian, Philippe Kahane, Jean-Philippe Lachaux, Aymeric Guillot, Karim Jerbi
Goal-directed motor behavior is associated with changes in patterns of rhythmic neuronal activity across widely distributed brain areas. In particular, movement initiation and execution are mediated by patterns of synchronization and desynchronization that occur concurrently across distinct frequency bands and across multiple motor cortical areas. To date, motor-related local oscillatory modulations have been predominantly examined by quantifying increases or suppressions in spectral power. However, beyond signal power, spectral properties such as phase and phase-amplitude coupling (PAC) have also been shown to carry information with regards to the oscillatory dynamics underlying motor processes...
November 30, 2016: NeuroImage
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