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https://www.readbyqxmd.com/read/28228579/network-wide-oscillations-in-the-parkinsonian-state-alterations-in-neuronal-activities-occur-in-the-premotor-cortex-in-parkinsonian-non-human-primates
#1
Jing Wang, Luke A Johnson, Alicia L Jensen, Kenneth B Baker, Jerrold L Vitek
A number of studies suggest that Parkinson's disease (PD) is associated with alterations of neuronal activity patterns in the basal-ganglia-thalamocortical circuit. There are limited electrophysiological data, however, describing how premotor cortex, which is involved in movement and decision making, is likely impacted in PD. In this study, spontaneous local field potential (LFP) and single unit neuronal activity were recorded in the dorsal premotor area of non-human primates in both the naïve and parkinsonian state using the MPTP model of parkinsonism...
February 22, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/28227526/valence-dependent-changes-in-visual-arousing-elicitation-an-exploratory-study-in-eeg-gamma-oscillations
#2
Alberto Greco, Gaetano Valenza, Enzo Pasquale Scilingo, Alberto Greco, Gaetano Valenza, Enzo Pasquale Scilingo, Gaetano Valenza, Enzo Pasquale Scilingo, Alberto Greco
Emotion regulation involves several brain areas such as prefrontal cortex, amygdala, and insular cortex. However, considering different levels of arousing elicitations, how such a brain dynamics is affected by emotional pleasant/unpleasant (valence) elicitation is not fully understood. To this aim, we propose an Electroencephalographic (EEG)-based preliminary study in which 22 healthy subjects were elicited through affective pictures gathered from the International Affective Picture System. Considering 4 arousing levels, each of which including two valence levels (pleasant and unpleasant), we investigated EEG power spectra and functional connectivity...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226629/emotion-classification-using-single-channel-scalp-eeg-recording
#3
Amir Jalilifard, Ednaldo Brigante Pizzolato, Md Kafiul Islam, Amir Jalilifard, Ednaldo Brigante Pizzolato, Md Kafiul Islam, Ednaldo Brigante Pizzolato, Amir Jalilifard, Md Kafiul Islam
Several studies have found evidence for corticolimbic Theta electroencephalographic (EEG) oscillation in the neural processing of visual stimuli perceived as fear or threatening scene. Recent studies showed that neural oscillations' patterns in Theta, Alpha, Beta and Gamma sub-bands play a main role in brain's emotional processing. The main goal of this study is to classify two different emotional states by means of EEG data recorded through a single-electrode EEG headset. Nineteen young subjects participated in an EEG experiment while watching a video clip that evoked three emotional states: neutral, relaxation and scary...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28222164/comt-and-drd2-ankk-1-gene-gene-interaction-account-for-resetting-of-gamma-neural-oscillations-to-auditory-stimulus-driven-attention
#4
Manuel Garcia-Garcia, Marc Via, Katarzyna Zarnowiec, Iria SanMiguel, Carles Escera, Immaculada C Clemente
Attention capture by potentially relevant environmental stimuli is critical for human survival, yet it varies considerably among individuals. A large series of studies has suggested that attention capture may depend on the cognitive balance between maintenance and manipulation of mental representations and the flexible switch between goal-directed representations and potentially relevant stimuli outside the focus of attention; a balance that seems modulated by a prefrontostriatal dopamine pathway. Here, we examined inter-individual differences in the cognitive control of attention through studying the effects of two single nucleotide polymorphisms regulating dopamine at the prefrontal cortex and the striatum (i...
2017: PloS One
https://www.readbyqxmd.com/read/28216627/layer-specific-optogenetic-activation-of-pyramidal-neurons-causes-beta-gamma-entrainment-of-neonatal-networks
#5
Sebastian H Bitzenhofer, Joachim Ahlbeck, Amy Wolff, J Simon Wiegert, Christine E Gee, Thomas G Oertner, Ileana L Hanganu-Opatz
Coordinated activity patterns in the developing brain may contribute to the wiring of neuronal circuits underlying future behavioural requirements. However, causal evidence for this hypothesis has been difficult to obtain owing to the absence of tools for selective manipulation of oscillations during early development. We established a protocol that combines optogenetics with electrophysiological recordings from neonatal mice in vivo to elucidate the substrate of early network oscillations in the prefrontal cortex...
February 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28214576/amplified-induced-neural-oscillatory-activity-predicts-musicians-benefits-in-categorical-speech-perception
#6
Gavin M Bidelman
Event-related brain potentials (ERPs) reveal musical experience refines neural encoding and confers stronger categorical perception (CP) and neural organization for speech sounds. In addition to evoked brain activity, the human EEG can be decomposed into induced (non-phase-locked) response whose various frequency bands reflect different mechanisms of perceptual-cognitive processing. Here, we aimed to clarify which spectral properties of these neural oscillations are most prone to music-related neuroplasticity and which are linked to behavioral benefits in the categorization of speech...
February 15, 2017: Neuroscience
https://www.readbyqxmd.com/read/28213446/acetylcholine-release-in-prefrontal-cortex-promotes-gamma-oscillations-and-theta-gamma-coupling-during-cue-detection
#7
W M Howe, H J Gritton, N Lusk, Erik A Roberts, Vaughn L Hetrick, Joshua D Berke, Martin Sarter
The capacity for using external cues to guide behavior ("cue detection") constitutes an essential aspect of attention and goal-directed behavior. The cortical cholinergic input system, via phasic increases in prefrontal acetylcholine release, plays an essential role in attention by mediating such cue detection. However, the relationship between cholinergic signaling during cue detection and neural activity dynamics in prefrontal networks remains unclear. Here we combined sub-second measures of cholinergic signaling, neurophysiological recordings, and cholinergic receptor blockade to delineate the cholinergic contributions to prefrontal oscillations during cue detection in rats...
February 17, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28192457/time-varying-spectral-power-of-resting-state-fmri-networks-reveal-cross-frequency-dependence-in-dynamic-connectivity
#8
Maziar Yaesoubi, Robyn L Miller, Vince D Calhoun
Brain oscillations and synchronicity among brain regions (brain connectivity) have been studied in resting-state (RS) and task-induced settings. RS-connectivity which captures brain functional integration during an unconstrained state is shown to vary with the frequency of oscillations. Indeed, high temporal resolution modalities have demonstrated both between and cross-frequency connectivity spanning across frequency bands such as theta and gamma. Despite high spatial resolution, functional magnetic resonance imaging (fMRI) suffers from low temporal resolution due to modulation with slow-varying hemodynamic response function (HRF) and also relatively low sampling rate...
2017: PloS One
https://www.readbyqxmd.com/read/28188912/characterization-of-neural-entrainment-to-speech-with-and-without-slow-spectral-energy-fluctuations-in-laminar-recordings-in-monkey-a1
#9
Benedikt Zoefel, Jordi Costa-Faidella, Peter Lakatos, Charles E Schroeder, Rufin VanRullen
Neural entrainment, the alignment between neural oscillations and rhythmic stimulation, is omnipresent in current theories of speech processing - nevertheless, the underlying neural mechanisms are still largely unknown. Here, we hypothesized that laminar recordings in non-human primates provide us with important insight into these mechanisms, in particular with respect to processing in cortical layers. We presented one monkey with human everyday speech sounds and recorded neural (as current-source density, CSD) oscillations in primary auditory cortex (A1)...
February 7, 2017: NeuroImage
https://www.readbyqxmd.com/read/28184188/stimulus-phase-locking-of-cortical-oscillations-for-rhythmic-tone-sequences-in-rats
#10
Takahiro Noda, Tomoki Amemiya, Tomoyo I Shiramatsu, Hirokazu Takahashi
Humans can rapidly detect regular patterns (i.e., within few cycles) without any special attention to the acoustic environment. This suggests that human sensory systems are equipped with a powerful mechanism for automatically predicting forthcoming stimuli to detect regularity. It has recently been hypothesized that the neural basis of sensory predictions exists for not only what happens (predictive coding) but also when a particular stimulus occurs (predictive timing). Here, we hypothesize that the phases of neural oscillations are critical in predictive timing, and these oscillations are modulated in a band-specific manner when acoustic patterns become predictable, i...
2017: Frontiers in Neural Circuits
https://www.readbyqxmd.com/read/28183030/estradiol-and-raloxifene-modulate-hippocampal-gamma-oscillations-during-a-spatial-memory-task
#11
Anna Schroeder, Matthew Hudson, Xin Du, Yee Wen Candace Wu, Jay Nakamura, Maarten van den Buuse, Nigel C Jones, Rachel A Hill
Previous work suggests that estradiol regulates the expression of hippocampal parvalbumin as well as hippocampus-dependent spatial memory in mice. Parvalbumin interneurons generate neuronal oscillatory activity in the gamma frequency range (30-80Hz) and gamma oscillations are closely linked with higher cognitive functions. Raloxifene, a selective estrogen receptor modulator, shows beneficial effects on human cognitive performance, and has few peripheral side effects unlike estradiol, but the biological mechanisms which underpin these benefits are not clear...
January 23, 2017: Psychoneuroendocrinology
https://www.readbyqxmd.com/read/28177924/adapted-wavelet-transform-improves-time-frequency-representations-a-study-of-auditory-elicited-p300-like-event-related-potentials-in-rats
#12
Nelly Richard, Bettina Laursen, Morten Grupe, Asbjørn M Drewes, Carina Graversen, Helge B D Sørensen, Jesper F Bastlund
OBJECTIVE: Active auditory oddball paradigms are simple tone discrimination tasks used to study the P300 deflection of event-related potentials (ERPs). These ERPs may be quantified by time-frequency analysis. As auditory stimuli cause early high frequency and late low frequency ERP oscillations, the continuous wavelet transform (CWT) is often chosen for decomposition due to its multi-resolution properties. However, as the conventional CWT traditionally applies only one mother wavelet to represent the entire spectrum, the time-frequency resolution is not optimal across all scales...
February 8, 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28176756/amygdala-hippocampal-dynamics-during-salient-information-processing
#13
Jie Zheng, Kristopher L Anderson, Stephanie L Leal, Avgusta Shestyuk, Gultekin Gulsen, Lilit Mnatsakanyan, Sumeet Vadera, Frank P K Hsu, Michael A Yassa, Robert T Knight, Jack J Lin
Recognizing motivationally salient information is critical to guiding behaviour. The amygdala and hippocampus are thought to support this operation, but the circuit-level mechanism of this interaction is unclear. We used direct recordings in the amygdala and hippocampus from human epilepsy patients to examine oscillatory activity during processing of fearful faces compared with neutral landscapes. We report high gamma (70-180 Hz) activation for fearful faces with earlier stimulus evoked onset in the amygdala compared with the hippocampus...
February 8, 2017: Nature Communications
https://www.readbyqxmd.com/read/28154537/odor-induced-neuronal-rhythms-in-the-olfactory-bulb-are-profoundly-modified-in-ob-ob-obese-mice
#14
Yan Chelminski, Christophe Magnan, Serge H Luquet, Amandine Everard, Nicolas Meunier, Hirac Gurden, Claire Martin
Leptin, the product of the Ob(Lep) gene, is a peptide hormone that plays a major role in maintaining the balance between food intake and energy expenditure. In the brain, leptin receptors are expressed by hypothalamic cells but also in the olfactory bulb, the first central structure coding for odors, suggesting a precise function of this hormone in odor-evoked activities. Although olfaction plays a key role in feeding behavior, the ability of the olfactory bulb to integrate the energy-related signal leptin is still missing...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28148460/impaired-theta-gamma-coupling-during-working-memory-performance-in-schizophrenia
#15
Mera S Barr, Tarek K Rajji, Reza Zomorrodi, Natasha Radhu, Tony P George, Daniel M Blumberger, Zafiris J Daskalakis
BACKGROUND: Working memory deficits represent a core feature of schizophrenia. These deficits have been associated with dysfunctional dorsolateral prefrontal cortex (DLPFC) cortical oscillations. Theta-gamma coupling describes the modulation of gamma oscillations by theta phasic activity that has been directly associated with the ordering of information during working memory performance. Evaluating theta-gamma coupling may provide greater insight into the neural mechanisms mediating working memory deficits in this disorder...
January 29, 2017: Schizophrenia Research
https://www.readbyqxmd.com/read/28146472/gamma-oscillations-organize-top-down-signalling-to-hypothalamus-and-enable-food-seeking
#16
Marta Carus-Cadavieco, Maria Gorbati, Li Ye, Franziska Bender, Suzanne van der Veldt, Christin Kosse, Christoph Börgers, Soo Yeun Lee, Charu Ramakrishnan, Yubin Hu, Natalia Denisova, Franziska Ramm, Emmanouela Volitaki, Denis Burdakov, Karl Deisseroth, Alexey Ponomarenko, Tatiana Korotkova
Both humans and animals seek primary rewards in the environment, even when such rewards do not correspond to current physiological needs. An example of this is a dissociation between food-seeking behaviour and metabolic needs, a notoriously difficult-to-treat symptom of eating disorders. Feeding relies on distinct cell groups in the hypothalamus, the activity of which also changes in anticipation of feeding onset. The hypothalamus receives strong descending inputs from the lateral septum, which is connected, in turn, with cortical networks, but cognitive regulation of feeding-related behaviours is not yet understood...
February 9, 2017: Nature
https://www.readbyqxmd.com/read/28138530/feedforward-and-feedback-frequency-dependent-interactions-in-a-large-scale-laminar-network-of-the-primate-cortex
#17
Jorge F Mejias, John D Murray, Henry Kennedy, Xiao-Jing Wang
Interactions between top-down and bottom-up processes in the cerebral cortex hold the key to understanding attentional processes, predictive coding, executive control, and a gamut of other brain functions. However, the underlying circuit mechanism remains poorly understood and represents a major challenge in neuroscience. We approached this problem using a large-scale computational model of the primate cortex constrained by new directed and weighted connectivity data. In our model, the interplay between feedforward and feedback signaling depends on the cortical laminar structure and involves complex dynamics across multiple (intralaminar, interlaminar, interareal, and whole cortex) scales...
November 2016: Science Advances
https://www.readbyqxmd.com/read/28129065/neural-oscillations-and-a-nascent-corticohippocampal-theory-of-reference
#18
Mante S Nieuwland, Andrea E Martin
The ability to use words to refer to the world is vital to the communicative power of human language. In particular, the anaphoric use of words to refer to previously mentioned concepts (antecedents) allows dialogue to be coherent and meaningful. Psycholinguistic theory posits that anaphor comprehension involves reactivating a memory representation of the antecedent. Whereas this implies the involvement of recognition memory or the mnemonic subroutines by which people distinguish old from new, the neural processes for reference resolution are largely unknown...
January 27, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/28128335/repeated-nicotine-strengthens-gamma-oscillations-in-the-prefrontal-cortex-and-improves-visual-attention
#19
Lezio S Bueno-Junior, Nicholas W Simon, Meredyth A Wegener, Bita Moghaddam
Nicotine has strong addictive as well as procognitive properties. While a large body of research on nicotine continues to inform us about mechanisms related to its reinforcing effects, less is known about clinically relevant mechanisms that subserve its cognitive enhancing properties. Understanding the latter is critical for developing optimal strategies for treating cognitive deficits. The primary brain region implicated in cognitive functions improved by nicotine is the prefrontal cortex (PFC). Here we assessed the impact of nicotine on unit activity and local field potential (LFP) oscillations in the PFC of behaving rats...
January 27, 2017: Neuropsychopharmacology: Official Publication of the American College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/28128211/glia-derived-atp-inversely-regulates-excitability-of-pyramidal-and-cck-positive-neurons
#20
Zhibing Tan, Yu Liu, Wang Xi, Hui-Fang Lou, Liya Zhu, Zhifei Guo, Lin Mei, Shumin Duan
Astrocyte responds to neuronal activity with calcium waves and modulates synaptic transmission through the release of gliotransmitters. However, little is known about the direct effect of gliotransmitters on the excitability of neuronal networks beyond synapses. Here we show that selective stimulation of astrocytes expressing channelrhodopsin-2 in the CA1 area specifically increases the firing frequency of CCK-positive but not parvalbumin-positive interneurons and decreases the firing rate of pyramidal neurons, phenomena mimicked by exogenously applied ATP...
January 27, 2017: Nature Communications
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