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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
#1
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/29765476/developmental-trends-of-theta-beta-interelectrode-power-correlation-during-resting-state-in-normal-children
#2
Ernesto Buiza, Elena I Rodríguez-Martínez, Catarina I Barriga-Paulino, Antonio Arjona, Carlos M Gómez
The possibility that power-to-power (theta-beta) frequency coupling increases during development was analyzed. Three minutes of spontaneous EEG in an open eyes condition were recorded in a sample of 160 subjects ranging from 6 to 26 years old. Theta (4-7 Hz) and beta band (15-20 Hz) power was calculated in a trial-by-trial basis. Inter-electrode power correlations (IPC) were computed in each subject as the correlation between the power of two frequency bands recorded in two electrodes. An increase in theta-beta IPC with age was obtained...
June 2018: Cognitive Neurodynamics
https://www.readbyqxmd.com/read/29762768/emergence-of-mature-cortical-activity-in-wakefulness-and-sleep-in-healthy-pre-term-and-full-term-infants
#3
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/29752227/a-novel-signal-modeling-approach-for-classification-of-seizure-and-seizure-free-eeg-signals
#4
Anubha Gupta, Pushpendra Singh, Mandar Karlekar
This paper presents a signal modeling-based new methodology of automatic seizure detection in EEG signals. The proposed method consists of three stages. First, a multirate filterbank structure is proposed that is constructed using the basis vectors of discrete cosine transform. The proposed filterbank decomposes EEG signals into its respective brain rhythms: delta, theta, alpha, beta, and gamma. Second, these brain rhythms are statistically modeled with the class of self-similar Gaussian random processes, namely, fractional Brownian motion and fractional Gaussian noises...
May 2018: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/29742457/some-technical-issues-of-vagal-nerve-stimulation-an-approach-using-a-hippocampal-formation-theta-rhythm
#5
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/29740300/spectral-spatial-differentiation-of-brain-activity-during-mental-imagery-of-improvisational-music-performance-using-meg
#6
Jared Boasen, Yuya Takeshita, Shinya Kuriki, Koichi Yokosawa
Group musical improvisation is thought to be akin to conversation, and therapeutically has been shown to be effective at improving communicativeness, sociability, creative expression, and overall psychological health. To understand these therapeutic effects, clarifying the nature of brain activity during improvisational cognition is important. Some insight regarding brain activity during improvisational music cognition has been gained via functional magnetic resonance imaging (fMRI) and electroencephalography (EEG)...
2018: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/29737585/no-changes-in-parieto-occipital-alpha-during-neural-phase-locking-to-visual-quasi-periodic-theta-alpha-and-beta-band-stimulation
#7
Christian Keitel, Christopher S Y Benwell, Gregor Thut, Joachim Gross
Recent studies have probed the role of the parieto-occipital alpha rhythm (8 - 12 Hz) in human visual perception through attempts to drive its neural generators. To that end, paradigms have used high-intensity strictly-periodic visual stimulation that created strong predictions about future stimulus occurrences and repeatedly demonstrated perceptual consequences in line with an entrainment of parieto-occipital alpha. Our study, in turn, examined the case of alpha entrainment by non-predictive low-intensity quasi-periodic visual stimulation within theta- (4 - 7 Hz), alpha- (8 - 13 Hz) and beta (14 - 20 Hz) frequency bands, i...
May 8, 2018: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29735880/-the-effects-of-neurofeedback-training-on-physical-psychoemotional-stress-response-and-self-regulation-for-late-adolescence-a-non-randomized-trial
#8
Moon Ji Choi, Wan Ju Park
PURPOSE: The aim of this study was to analyze the effects of neurofeedback training for reducing stress and enhancing self-regulation in late adolescence to identify the possibility of use for nursing intervention. METHODS: A nonequivalent control group pre-post quasi-experimental design was used. Participants were 78 late adolescents assigned to the experimental group (n=39) that received the neurofeedback training and the control group (n=39). Data were collected on heart rate variability (HRV) and skin conductance level (SCL) to assess stress-biomarker response...
April 2018: Journal of Korean Academy of Nursing
https://www.readbyqxmd.com/read/29722152/modulation-of-forebrain-function-by-nucleus-incertus-and-relaxin-3-rxfp3-signaling
#9
REVIEW
Francisco E Olucha-Bordonau, Héctor Albert-Gascó, Francisco Ros-Bernal, Valeria Rytova, Emma K E Ong-Pålsson, Sherie Ma, Ana M Sánchez-Pérez, Andrew L Gundlach
The nucleus incertus (NI) in the pontine tegmentum sends ascending projections to the midbrain, hypothalamus, amygdala, basal forebrain, hippocampus, and prefrontal cortex, and has a postulated role in modulating several forebrain functions. A substantial population of GABAergic NI neurons expresses the neuropeptide, relaxin-3, which acts via the Gi/o -protein-coupled receptor, RXFP3, present throughout the forebrain target regions. Broad and specific manipulations of these systems by activation or inhibition of the NI or modulating RXFP3 signaling have revealed key insights into the likely influence of the NI/relaxin-3/RXFP3 system on modalities including arousal, feeding, stress responses, anxiety and addiction, and attention and memory...
May 2, 2018: CNS Neuroscience & Therapeutics
https://www.readbyqxmd.com/read/29700421/ultra-slow-mechanical-stimulation-of-olfactory-epithelium-modulates-consciousness-by-slowing-cerebral-rhythms-in-humans
#10
A Piarulli, A Zaccaro, M Laurino, D Menicucci, A De Vito, L Bruschini, S Berrettini, M Bergamasco, S Laureys, A Gemignani
The coupling between respiration and neural activity within olfactory areas and hippocampus has recently been unambiguously demonstrated, its neurophysiological basis sustained by the well-assessed mechanical sensitivity of the olfactory epithelium. We herein hypothesize that this coupling reverberates to the whole brain, possibly modulating the subject's behavior and state of consciousness. The olfactory epithelium of 12 healthy subjects was stimulated with periodical odorless air-delivery (frequency 0.05 Hz, 8 s on, 12 off)...
April 26, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29691421/parallel-detection-of-theta-and-respiration-coupled-oscillations-throughout-the-mouse-brain
#11
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/29670114/entrainment-of-theta-not-alpha-oscillations-is-predictive-of-the-brightness-enhancement-of-a-flickering-stimulus
#12
Jennifer K Bertrand, Nathan J Wispinski, Kyle E Mathewson, Craig S Chapman
Frequency-dependent brightness enhancement, where a flickering light can appear twice as bright as an equiluminant constant light, has been reported to exist within the alpha (8-12 Hz) band. Could oscillatory neural activity be driving this perceptual effect? Here, in two experiments, human subjects reported which of two flickering stimuli were brighter. Strikingly, 4 Hz stimuli were reported as brighter more than 80% of the time when compared to all other tested frequencies, even though all stimuli were equiluminant and of equal temporal length...
April 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29664887/%C3%AE-aminobutyric-acid-type-a-receptor-potentiation-inhibits-learning-in-a-computational-network-model
#13
Kingsley P Storer, George N Reeke
BACKGROUND: Propofol produces memory impairment at concentrations well below those abolishing consciousness. Episodic memory, mediated by the hippocampus, is most sensitive. Two potentially overlapping scenarios may explain how γ-aminobutyric acid receptor type A (GABAA) potentiation by propofol disrupts episodic memory-the first mediated by shifting the balance from excitation to inhibition while the second involves disruption of rhythmic oscillations. We use a hippocampal network model to explore these scenarios...
April 17, 2018: Anesthesiology
https://www.readbyqxmd.com/read/29628373/hippocampal-neural-circuits-respond-to-optogenetic-pacing-of-theta-frequencies-by-generating-accelerated-oscillation-frequencies
#14
Ipshita Zutshi, Mark P Brandon, Maylin L Fu, Macayla L Donegan, Jill K Leutgeb, Stefan Leutgeb
Biological oscillations can be controlled by a small population of rhythmic pacemaker cells, or in the brain, they also can emerge from complex cellular and circuit-level interactions. Whether and how these mechanisms are combined to give rise to oscillatory patterns that govern cognitive function are not well understood. For example, the activity of hippocampal networks is temporally coordinated by a 7- to 9-Hz local field potential (LFP) theta rhythm, yet many individual cells decouple from the LFP frequency to oscillate at frequencies ∼1 Hz higher...
April 3, 2018: Current Biology: CB
https://www.readbyqxmd.com/read/29593605/eeg-correlates-of-the-flow-state-a-combination-of-increased-frontal-theta-and-moderate-frontocentral-alpha-rhythm-in-the-mental-arithmetic-task
#15
Kenji Katahira, Yoichi Yamazaki, Chiaki Yamaoka, Hiroaki Ozaki, Sayaka Nakagawa, Noriko Nagata
Flow experience is a subjective state experienced during holistic involvement in a certain activity, which has been reported to function as a factor promoting motivation, skill development, and better performance in the activity. To verify the positive effects of flow and develop a method to utilize it, the establishment of a reliable measurement of the flow state is essential. The present study utilized an electroencephalogram (EEG) during an experimentally evoked flow state and examined the possibility of objective measurement of immediate flow...
2018: Frontiers in Psychology
https://www.readbyqxmd.com/read/29562187/hippocampal-theta-gamma-coupling-reflects-state-dependent-information-processing-in-decision-making
#16
Seiichiro Amemiya, A David Redish
During decision making, hippocampal activity encodes information sometimes about present and sometimes about potential future plans. The mechanisms underlying this transition remain unknown. Building on the evidence that gamma oscillations at different frequencies (low gamma [LG], 30-55 Hz; high gamma [HG], 60-90 Hz; and epsilon, 100-140 Hz) reflect inputs from different circuits, we identified how changes in those frequencies reflect different information-processing states. Using a unique noradrenergic manipulation by clonidine, which shifted both neural representations and gamma states, we found that future representations depended on gamma components...
March 20, 2018: Cell Reports
https://www.readbyqxmd.com/read/29518565/distinct-phase-amplitude-couplings-distinguish-cognitive-processes-in-human-attention
#17
Ravi V Chacko, Byungchan Kim, Suh Woo Jung, Amy L Daitch, Jarod L Roland, Nicholas V Metcalf, Maurizio Corbetta, Gordon L Shulman, Eric C Leuthardt
Spatial attention is the cognitive function that coordinates the selection of visual stimuli with appropriate behavioral responses. Recent studies have reported that phase-amplitude coupling (PAC) of low and high frequencies covaries with spatial attention, but differ on the direction of covariation and the frequency ranges involved. We hypothesized that distinct phase-amplitude frequency pairs have differentiable contributions during tasks that manipulate spatial attention. We investigated this hypothesis with electrocorticography (ECoG) recordings from participants who engaged in a cued spatial attention task...
March 5, 2018: NeuroImage
https://www.readbyqxmd.com/read/29513682/single-session-tdcs-over-the-dominant-hemisphere-affects-contralateral-spectral-eeg-power-but-does-not-enhance-neurofeedback-guided-event-related-desynchronization-of-the-non-dominant-hemisphere-s-sensorimotor-rhythm
#18
Valeria Mondini, Anna Lisa Mangia, Angelo Cappello
BACKGROUND AND OBJECTIVE: Transcranial direct current stimulation (tDCS) and neurofeedback-guided motor imagery (MI) have attracted considerable interest in neurorehabilitation, given their ability to influence neuroplasticity. As tDCS has been shown to modulate event-related desynchronization (ERD), the neural signature of motor imagery detected for neurofeedback, a combination of the techniques was recently proposed. One limitation of this approach is that the area targeted for stimulation is the same from which the signal for neurofeedback is acquired...
2018: PloS One
https://www.readbyqxmd.com/read/29473981/theta-frequency-decreases-throughout-the-hippocampal-formation-in-a-focal-epilepsy-model
#19
Antje Kilias, Ute Häussler, Katharina Heining, Ulrich P Froriep, Carola A Haas, Ulrich Egert
Mesial temporal lobe epilepsy is characterized by focal, recurrent spontaneous seizures, sclerosis and granule cell dispersion (GCD) in the hippocampal formation. Changes in theta rhythm properties have been correlated with the severity of hippocampal restructuring and were suggested as a cause of memory deficits accompanying epilepsy. For severe sclerosis, it has even been questioned whether theta band oscillations persist. We asked how theta oscillations change with graded restructuring along the longitudinal hippocampal axis and whether these changes correlate with the overall severity of temporal lobe epilepsy...
February 23, 2018: Hippocampus
https://www.readbyqxmd.com/read/29468778/behavioral-preference-in-sequential-decision-making-and-its-association-with-anxiety
#20
Dandan Zhang, Ruolei Gu
In daily life, people often make consecutive decisions before the ultimate goal is reached (i.e., sequential decision-making). However, this kind of decision-making has been largely overlooked in the literature. The current study investigated whether behavioral preference would change during sequential decisions, and the neural processes underlying the potential changes. For this purpose, we revised the classic balloon analogue risk task and recorded the electroencephalograph (EEG) signals associated with each step of decision-making...
February 21, 2018: Human Brain Mapping
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