keyword
MENU ▼
Read by QxMD icon Read
search

gamma oscillations

keyword
https://www.readbyqxmd.com/read/29217685/scale-free-amplitude-modulation-of-neuronal-oscillations-tracks-comprehension-of-accelerated-speech
#1
Ana Filipa Teixeira Borges, Anne-Lise Giraud, Huibert D Mansvelder, Klaus Linkenkaer-Hansen
Speech comprehension is preserved up to a three-fold acceleration but rapidly deteriorates at higher speeds. Current models posit that perceptual resilience to accelerated speech is limited by the brain's ability to parse speech into syllabic units using delta/theta oscillations. Here, we ask whether the involvement of neuronal oscillations in processing accelerated speech also relates to their scale-free amplitude modulation as indexed by the strength of long-range temporal correlations (LRTC). We recorded magnetoencephalography (MEG) while 24 human subjects (12 females) listened to radio news uttered at different comprehensible rates, at a mostly unintelligible rate, and at this same speed interleaved with silence gaps...
December 6, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/29206101/serotonin-enhances-excitability-and-gamma-frequency-temporal-integration-in-mouse-prefrontal-fast-spiking-interneurons
#2
Jegath C Athilingam, Roy Ben-Shalom, Caroline M Keeshen, Vikaas Sohal, Kevin Bender
The medial prefrontal cortex plays a key role in higher order cognitive functions like decision making and social cognition. These complex behaviors emerge from the coordinated firing of prefrontal neurons. Fast-spiking interneurons (FSIs) control the timing of excitatory neuron firing via somatic inhibition and generate gamma (30-100 Hz) oscillations. Therefore, factors that regulate how FSIs respond to gamma-frequency input could affect both prefrontal circuit activity and behavior. Here, we show that serotonin (5HT), which is known to regulate gamma power, acts via 5HT2A receptors to suppress an inward-rectifying potassium conductance in FSIs...
December 5, 2017: ELife
https://www.readbyqxmd.com/read/29196183/nmda-receptor-antagonist-rodent-models-for-cognition-in-schizophrenia-and-identification-of-novel-drug-treatments-an-update
#3
REVIEW
Daniela Cadinu, Ben Grayson, Giovanni Podda, Michael K Harte, Nazanin Doostdar, Joanna C Neill
Negative and cognitive deficit symptoms in schizophrenia remain an unmet clinical need. Improved understanding of the neuro- and psychopathology of cognitive dysfunction in the illness is urgently required to enhance the development of new improved therapeutic strategies. Careful validation of animal models that mimic the behaviour and pathology of complex psychiatric disorders is an essential step towards this goal. Non-competitive NMDAR (N-Methyl-d-aspartate receptor) antagonists e.g. phencyclidine (PCP), ketamine and dizocilpine (MK-801) can effectively replicate certain aspects of negative and cognitive deficits associated with schizophrenia in animals...
November 28, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/29194486/cortical-auditory-evoked-responses-in-preterm-neonates-revisited-by-spectral-and-temporal-analyses
#4
A Kaminska, V Delattre, J Laschet, J Dubois, M Labidurie, A Duval, A Manresa, J-F Magny, S Hovhannisyan, M Mokhtari, L Ouss, A Boissel, L Hertz-Pannier, M Sintsov, M Minlebaev, R Khazipov, C Chiron
Characteristic preterm EEG patterns of "Delta-brushes" (DBs) have been reported in the temporal cortex following auditory stimuli, but their spatio-temporal dynamics remains elusive. Using 32-electrode EEG recordings and co-registration of electrodes' position to 3D-MRI of age-matched neonates, we explored the cortical auditory-evoked responses (AERs) after 'click' stimuli in 30 healthy neonates aged 30-38 post-menstrual weeks (PMW). (1) We visually identified auditory-evoked DBs within AERs in all the babies between 30 and 33 PMW and a decreasing response rate afterwards...
August 11, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29193050/antagonistic-relationship-between-vep-potentiation-and-gamma-power-in-visual-snow-syndrome
#5
Sebastian Luna, Daniel Lai, Alison Harris
OBJECTIVE: Using a "double-pulse" adaptation paradigm, in which two stimuli are presented in quick succession, this study examines the neural mechanisms underlying potentiation of the visual evoked potential (VEP) in visual snow syndrome. BACKGROUND: Visual snow is a persistent visual disturbance characterized by rapid flickering dots throughout the visual field. Like the related condition of migraine with aura, visual snow has been hypothesized to arise from abnormal neuronal responsiveness, as demonstrated by a lack of typical VEP habituation to repeated visual stimulation...
November 29, 2017: Headache
https://www.readbyqxmd.com/read/29190329/cortical-phase-amplitude-coupling-in-a-progressive-model-of-parkinsonism-in-nonhuman-primates
#6
Annaelle Devergnas, M Caiola, D Pittard, T Wichmann
Parkinson's disease is associated with abnormal oscillatory electrical activities of neurons and neuronal ensembles throughout the basal ganglia-thalamocortical network. It has recently been documented in patients with advanced parkinsonism that the amplitude of gamma-band oscillations (50-200 Hz) in electrocorticogram recordings from the primary motor cortex is abnormally coupled to the phase of beta band oscillations within the same signals. It is not known when in the course of the disease the abnormal phase-amplitude coupling (PAC) arises, and whether it is influenced by arousal or prior exposure to dopaminergic medications...
November 28, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29186681/gamma-oscillations-in-rat-hippocampal-subregions-dentate-gyrus-ca3-ca1-and-subiculum-underlie-associative-memory-encoding
#7
John B Trimper, Claire R Galloway, Andrew C Jones, Kaavya Mandi, Joseph R Manns
Neuronal oscillations in the rat hippocampus relate to both memory and locomotion, raising the question of how these cognitive and behavioral correlates interact to determine the oscillatory network state of this region. Here, rats freely locomoted while performing an object-location task designed to test hippocampus-dependent spatial associative memory. Rhythmic activity in theta, beta, slow gamma, and fast gamma frequency ranges were observed in both action potentials and local field potentials (LFPs) across four main hippocampal subregions...
November 28, 2017: Cell Reports
https://www.readbyqxmd.com/read/29182612/nucleus-accumbens-local-field-potential-power-spectrums-phase-amplitude-couplings-and-coherences-following-morphine-treatment
#8
Chayaporn Reakkamnuan, Dania Cheaha, Ekkasit Kumarnsit
In the past decade, neural processing has been extensively studied in cognitive neuroscience. However, neural signaling in the nucleus accumbens (NAc) that might clarify reward process remained to be investigated. Male Swiss albino ICR mice implanted with intracranial electrodes into the NAc and the ventral tegmental area (VTA) were used for morphine administration and local field potential (LFP) recording. One-way ANOVA revealed significant increases in low (30.3-44.9 Hz) and high (60.5-95.7 Hz) gamma powers in the NAc following morphine administration (5 and 15 mg/kg, i...
2017: Acta Neurobiologiae Experimentalis
https://www.readbyqxmd.com/read/29176684/acupuncture-analgesia-involves-modulation-of-pain-induced-gamma-oscillations-and-cortical-network-connectivity
#9
Michael Hauck, Sven Schröder, Gesa Meyer-Hamme, Jürgen Lorenz, Sunja Friedrichs, Guido Nolte, Christian Gerloff, Andreas K Engel
Recent studies support the view that cortical sensory, limbic and executive networks and the autonomic nervous system might interact in distinct manners under the influence of acupuncture to modulate pain. We performed a double-blind crossover design study to investigate subjective ratings, EEG and ECG following experimental laser pain under the influence of sham and verum acupuncture in 26 healthy volunteers. We analyzed neuronal oscillations and inter-regional coherence in the gamma band of 128-channel-EEG recordings as well as heart rate variability (HRV) on two experimental days...
November 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29167729/emotional-face-recognition-in-children-with-attention-deficit-hyperactivity-disorder-evidence-from-event-related-gamma-oscillation
#10
Mahdiyeh Sarraf Razavi, Mehdi Tehranidoost, Farnaz Ghassemi, Parivash Purabassi, Athena Taymourtash
Introduction: Children with attention-deficit/hyperactivity disorder (ADHD) have some impairment in emotional relationship which can be due to problems in emotional processing. The present study investigated neural correlates of early stages of emotional face processing in this group compared with typically developing children using the Gamma Band Activity (GBA). Methods: A total of 19 children diagnosed with ADHD (Combined type) based on DSM-IV classification were compared with 19 typically developing children matched on age, gender, and IQ...
September 2017: Basic and Clinical Neuroscience
https://www.readbyqxmd.com/read/29163087/localized-fluctuant-oscillatory-activity-by-working-memory-load-a-simultaneous-eeg-fmri-study
#11
Xiaojie Zhao, Xiaoyun Li, Li Yao
Working memory (WM) is a resource-limited memory system for temporary storage and processing of brain information during the execution of cognitive tasks. Increased WM load will increase the amount and difficulty of memory information. Several studies have used electroencephalography (EEG) or functional magnetic resonance imaging (fMRI) to explore load-dependent cognition processing according to the time courses of electrophysiological activity or the spatial pattern of blood oxygen metabolic activity. However, the relationships between these two activities and the underlying neural mechanism are still unclear...
2017: Frontiers in Behavioral Neuroscience
https://www.readbyqxmd.com/read/29161621/human-subthalamic-oscillatory-dynamics-following-somatosensory-stimulation
#12
Saskia Elben, Carlos Trenado, Jan Vesper, Alfons Schnitzler, Lars Wojtecki
OBJECTIVE: Electrical median nerve somatosensory stimulation leads to a distinct modulation of cortical oscillations. Initial high frequency and gamma augmentation, as well as modulation of beta and alpha oscillations have been reported. We aimed at investigating the involvement of the subthalamic nucleus in somatosensory processing by means of local field potential recordings, since recordings during passive movements and peripheral somatosensory stimulation have suggested a prominent role...
October 28, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29161383/basal-forebrain-gating-by-somatostatin-neurons-drives-prefrontal-cortical-activity
#13
Nelson Espinosa, Alejandra Alonso, Cristian Morales, Pedro Espinosa, Andrés E Chávez, Pablo Fuentealba
The basal forebrain provides modulatory input to the cortex regulating brain states and cognitive processing. Somatostatin-expressing neurons constitute a heterogeneous GABAergic population known to functionally inhibit basal forebrain cortically projecting cells thus favoring sleep and cortical synchronization. However, it remains unclear if somatostatin cells can regulate population activity patterns in the basal forebrain and modulate cortical dynamics. Here, we demonstrate that somatostatin neurons regulate the corticopetal synaptic output of the basal forebrain impinging on cortical activity and behavior...
November 17, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/29140973/a-coupled-oscillator-model-of-olfactory-bulb-gamma-oscillations
#14
Guoshi Li, Thomas A Cleland
The olfactory bulb transforms not only the information content of the primary sensory representation, but also its underlying coding metric. High-variance, slow-timescale primary odor representations are transformed by bulbar circuitry into secondary representations based on principal neuron spike patterns that are tightly regulated in time. This emergent fast timescale for signaling is reflected in gamma-band local field potentials, presumably serving to efficiently integrate olfactory sensory information into the temporally regulated information networks of the central nervous system...
November 15, 2017: PLoS Computational Biology
https://www.readbyqxmd.com/read/29125416/gamma-oscillations-in-the-somatosensory-thalamus-of-a-patient-with-a-phantom-limb-case-report
#15
Diellor Basha, Jonathan O Dostrovsky, Suneil K Kalia, Mojgan Hodaie, Andres M Lozano, William D Hutchison
The amputation of an extremity is commonly followed by phantom sensations that are perceived to originate from the missing limb. The mechanism underlying the generation of these sensations is still not clear although the development of abnormal oscillatory bursting in thalamic neurons may be involved. The theory of thalamocortical dysrhythmia implicates gamma oscillations in phantom pathophysiology although this rhythm has not been previously observed in the phantom limb thalamus. In this study, the authors report the novel observation of widespread 38-Hz gamma oscillatory activity in spike and local field potential recordings obtained from the ventral caudal somatosensory nucleus of the thalamus (Vc) of a phantom limb patient undergoing deep brain stimulation (DBS) surgery...
November 10, 2017: Journal of Neurosurgery
https://www.readbyqxmd.com/read/29124106/gamma-rhythm-low-field-magnetic-stimulation-alleviates-neuropathologic-changes-and-rescues-memory-and-cognitive-impairments-in-a-mouse-model-of-alzheimer-s-disease
#16
Junli Zhen, Yanjing Qian, Xiechuan Weng, Wenting Su, Jianliang Zhang, Lihui Cai, Lin Dong, Haiting An, Ruijun Su, Jiang Wang, Yan Zheng, Xiaomin Wang
Introduction: The abnormal amyloid β (Aβ) accumulation and Aβ-related neural network dysfunction are considered central to the pathogenesis of Alzheimer's disease (AD) at the early stage. Deep-brain reachable low field magnetic stimulation (DMS), a novel noninvasive approach that was designed to intervene the network activity in brains, has been found to alleviate stress-related cognitive impairments. Methods: Amyloid precursor protein/presenilin-1 transgenic mice (5XFAD) were treated with DMS, and cognitive behavior and AD-like pathologic changes in the neurochemical and electrophysiological properties in 5XFAD mice were assessed...
November 2017: Alzheimer's & Dementia: Translational Research & Clinical Interventions
https://www.readbyqxmd.com/read/29122445/a-method-for-the-topographical-identification-and-quantification-of-high-frequency-oscillations-in-intracranial-electroencephalography-recordings
#17
Zachary J Waldman, Shoichi Shimamoto, Inkyung Song, Iren Orosz, Anatol Bragin, Itzhak Fried, Jerome Engel, Richard Staba, Michael R Sperling, Shennan A Weiss
OBJECTIVE: To develop a reliable software method using a topographic analysis of time-frequency plots to distinguish ripple (80-200 Hz) oscillations that are often associated with EEG sharp waves or spikes (RonS) from sinusoid-like waveforms that appear as ripples but correspond with digital filtering of sharp transients contained in the wide bandwidth EEG. METHODS: A custom algorithm distinguished true from false ripples in one second intracranial EEG (iEEG) recordings using wavelet convolution, identifying contours of isopower, and categorizing these contours into sets of open or closed loop groups...
October 21, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/29120510/in-vitro-characterization-of-gamma-oscillations-in-the-hippocampal-formation-of-the-domestic-chick
#18
Pradeep Dheerendra, Nicholas M Lynch, Joseph Crutwell, Mark O Cunningham, Tom V Smulders
Avian and mammalian brains have evolved independently from each other for about 300 million years. During that time, the hippocampal formation (HF) has diverged in morphology and cyto-architecture, but seems to have conserved much of its function. It is therefore an open question how seemingly different neural organizations can generate the same function. A prominent feature of the mammalian hippocampus is that it generates different neural oscillations, including the gamma rhythm, which plays an important role in memory processing...
November 9, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/29118193/duration-analysis-using-matching-pursuit-algorithm-reveals-longer-bouts-of-gamma-rhythm
#19
Subhash Chandran Ks, Chandra Sekhar Seelamantula, Supratim Ray
The gamma rhythm (30 to 80 Hz), often associated with high-level cortical functions, is believed to provide a temporal reference frame for spiking activity, for which it should have a stable center frequency and linear phase for an extended duration. However, recent studies that have estimated the power and phase of gamma as a function of time suggest that gamma occurs in short bursts and lacks the temporal structure required to act as a reference frame. Here we show that the bursty appearance of gamma arises from the variability in the spectral estimator used in these studies...
November 8, 2017: Journal of Neurophysiology
https://www.readbyqxmd.com/read/29118102/phencyclidine-discoordinates-hippocampal-network-activity-but-not-place-fields
#20
Hsin-Yi Kao, Dino Dvořák, EunHye Park, Jana Kenney, Eduard Kelemen, André A Fenton
We used the psychotomimetic phencyclidine (PCP) to investigate the relationships between cognitive behavior, coordinated neural network function and information processing within the hippocampus place cell system. We report in rats that PCP (5mg/kg i.p.) impairs a well-learned hippocampus-dependent place avoidance behavior in rats that requires cognitive control, even when PCP is injected directly into dorsal hippocampus. PCP increases 60-100 Hz medium gamma oscillations in hippocampus CA1 and these increases correlate with the cognitive impairment caused by systemic PCP administration...
November 8, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
keyword
keyword
30868
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"