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Theta oscillation

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https://www.readbyqxmd.com/read/28526621/electrophysiological-signatures-of-phonological-and-semantic-maintenance-in-sentence-repetition
#1
Jed A Meltzer, Aneta Kielar, Lilia Panamsky, Kira A Links, Tiffany Deschamps, Rosie C Leigh
Verbal short-term memory comprises resources for phonological rehearsal, which have been characterized anatomically, and for maintenance of semantic information, which are less understood. Sentence repetition tasks tap both processes interactively. To distinguish brain activity involved in phonological vs. semantic maintenance, we recorded magnetoencephalography during a sentence repetition task, incorporating three manipulations emphasizing one mechanism over the other. Participants heard sentences or word lists and attempted to repeat them verbatim after a 5-second delay...
May 16, 2017: NeuroImage
https://www.readbyqxmd.com/read/28522331/internal-mechanisms-underlying-anticipatory-language-processing-evidence-from-event-related-potentials-and-neural-oscillations
#2
Xiaoqing Li, Yuping Zhang, Jinyan Xia, Tamara Y Swaab
Although numerous studies have demonstrated that the language processing system can predict upcoming content during comprehension, there is still no clear picture of the anticipatory stage of predictive processing. This electroencephalograph study examined the cognitive and neural oscillatory mechanisms underlying anticipatory processing during language comprehension, and the consequences of this prediction for bottom-up processing of predicted/unpredicted content. Participants read Mandarin Chinese sentences that were either strongly or weakly constraining and that contained critical nouns that were congruent or incongruent with the sentence contexts...
May 15, 2017: Neuropsychologia
https://www.readbyqxmd.com/read/28521127/synaptic-plasticity-engrams-and-network-oscillations-in-amygdala-circuits-for-storage-and-retrieval-of-emotional-memories
#3
REVIEW
Marco Bocchio, Sadegh Nabavi, Marco Capogna
The neuronal circuits of the basolateral amygdala (BLA) are crucial for acquisition, consolidation, retrieval, and extinction of associative emotional memories. Synaptic plasticity in BLA neurons is essential for associative emotional learning and is a candidate mechanism through which subsets of BLA neurons (commonly termed "engram") are recruited during learning and reactivated during memory retrieval. In parallel, synchronous oscillations in the theta and gamma bands between the BLA and interconnected structures have been shown to occur during consolidation and retrieval of emotional memories...
May 17, 2017: Neuron
https://www.readbyqxmd.com/read/28511124/demonstration-of-short-term-plasticity-in-the-dorsolateral-prefrontal-cortex-with-theta-burst-stimulation-a-tms-eeg-study
#4
Sung Wook Chung, Benjamin P Lewis, Nigel C Rogasch, Takashi Saeki, Richard H Thomson, Kate E Hoy, Neil W Bailey, Paul B Fitzgerald
OBJECTIVES: To examine the effects of intermittent TBS (iTBS) and continuous TBS (cTBS) on cortical reactivity in the dorsolateral prefrontal cortex. METHODS: 10 healthy participants were stimulated with either iTBS, cTBS or sham at F3 electrode. Single- and paired-pulse TMS and concurrent electroencephalography (EEG) were used to assess change in cortical reactivity and long-interval intracortical inhibition (LICI) via TMS-evoked potentials (TEPs) and TMS-evoked oscillations...
April 24, 2017: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/28506629/hippocampal-information-processing-across-sleep-wake-cycles
#5
REVIEW
Kenji Mizuseki, Hiroyuki Miyawaki
According to a two-stage memory consolidation model, during waking theta states, afferent activity from the neocortex to the hippocampus induces transient synaptic modification in the hippocampus, where the information is deposited as a labile form of memory trace. During subsequent sharp-wave ripples (SPW-Rs), the newly acquired hippocampal information is transferred to the neocortex and stored as a long-lasting memory trace. Consistent with this hypothesis, waking theta states and SPW-Rs distinctly control information flow in the hippocampal-entorhinal loop...
May 12, 2017: Neuroscience Research
https://www.readbyqxmd.com/read/28502585/frontoparietal-neurostimulation-modulates-working-memory-training-benefits-and-oscillatory-synchronization
#6
Kevin T Jones, Dwight J Peterson, Kara J Blacker, Marian E Berryhill
There is considerable interest in maintaining working memory (WM) because it is essential to accomplish most cognitive tasks, and it is correlated with fluid intelligence and ecologically valid measures of daily living. Toward this end, WM training protocols aim to improve WM capacity and extend improvements to unpracticed domains, yet success is limited. One emerging approach is to couple WM training with transcranial direct current stimulation (tDCS). This pairing of WM training with tDCS in longitudinal designs promotes behavioral improvement and evidence of transfer of performance gains to untrained WM tasks...
May 11, 2017: Brain Research
https://www.readbyqxmd.com/read/28497235/spatiotemporal-dynamics-of-the-cortical-responses-induced-by-a-prolonged-tactile-stimulation-of-the-human-fingertips
#7
Clara Genna, Calogero M Oddo, Chiara Fanciullacci, Carmelo Chisari, Henrik Jörntell, Fiorenzo Artoni, Silvestro Micera
The sense of touch is fundamental for daily behavior. The aim of this work is to understand the neural network responsible for touch processing during a prolonged tactile stimulation, delivered by means of a mechatronic platform by passively sliding a ridged surface under the subject's fingertip while recording the electroencephalogram (EEG). We then analyzed: (i) the temporal features of the Somatosensory Evoked Potentials and their topographical distribution bilaterally across the cortex; (ii) the associated temporal modulation of the EEG frequency bands...
May 11, 2017: Brain Topography
https://www.readbyqxmd.com/read/28493348/effect-of-eye-opening-on-single-unit-activity-and-local-field-potentials-in-the-subthalamic-nucleus
#8
Arun Chockalingam, Abigail Belasen, Nita Chen, Adolfo Ramirez-Zamora, Youngwon Youn, Paul Feustel, Meghan E Wilock, Damian S Shin, Julie G Pilitsis
BACKGROUND: Subthalamic nucleus deep brain stimulation (STN DBS) is an established treatment in Parkinson's disease (PD). We investigate the effect of eye opening on neuronal activity and local field potentials (LFPs) in the STN. METHODS: We prospectively enrolled 25 PD patients undergoing STN DBS in our institution. During DBS, single-unit activity (SUA) and LFPs were measured when eyes were open and closed. As movement is known to result in changes in LFPs, we tested response to eye opening in the presence and absence of movement...
May 10, 2017: Neuromodulation: Journal of the International Neuromodulation Society
https://www.readbyqxmd.com/read/28491003/theta-rhythmopathy-as-a-cause-of-cognitive-disability-in-tle
#9
Tristan Shuman, Benjamin Amendolara, Peyman Golshani
Memory difficulties are commonly associated with temporal lobe epilepsy (TLE) and cause significant disability. This article reviews the role of altered hippocampal theta oscillations and theta-gamma coupling as potential causes of memory disturbance in temporal lobe epilepsy, dissecting the potential mechanisms underlying these changes in large-scale neuronal synchronization. We discuss development of treatments for cognitive dysfunction directed at restoring theta rhythmicity and future directions for research...
March 2017: Epilepsy Currents
https://www.readbyqxmd.com/read/28486269/neurophysiologic-correlates-of-ketamine-sedation-and-anesthesia-a-high-density-electroencephalography-study-in-healthy-volunteers
#10
Phillip E Vlisides, Tarik Bel-Bahar, UnCheol Lee, Duan Li, Hyoungkyu Kim, Ellen Janke, Vijay Tarnal, Adrian B Pichurko, Amy M McKinney, Bryan S Kunkler, Paul Picton, George A Mashour
BACKGROUND: Previous studies have demonstrated inconsistent neurophysiologic effects of ketamine, although discrepant findings might relate to differences in doses studied, brain regions analyzed, coadministration of other anesthetic medications, and resolution of the electroencephalograph. The objective of this study was to characterize the dose-dependent effects of ketamine on cortical oscillations and functional connectivity. METHODS: Ten healthy human volunteers were recruited for study participation...
May 9, 2017: Anesthesiology
https://www.readbyqxmd.com/read/28483096/electroencephalogram-alpha-to-theta-ratio-over-left-fronto-temporal-region-correlates-with-negative-symptoms-in-schizophrenia
#11
Sayantanava Mitra, Shamsul Haque Nizamie, Nishant Goyal, Sai Krishna Tikka
BACKGROUND: Negative symptoms impair outcomes on occupational functioning, social interaction and interpersonal relationships in patients with schizophrenia. Past researchers have reported reduced alpha and increased theta and delta spectral powers on quantitative EEG recordings in those with prominent negative symptoms. AIM: Present analysis aimed at exploring the relationships between lower-frequency EEG powers and negative symptoms, in schizophrenia, over a period of naturalistic antipsychotic treatment...
April 2017: Asian Journal of Psychiatry
https://www.readbyqxmd.com/read/28479324/theta-oscillations-during-active-sleep-synchronize-the-developing-rubro-hippocampal-sensorimotor-network
#12
Carlos Del Rio-Bermudez, Jangjin Kim, Greta Sokoloff, Mark S Blumberg
Neuronal oscillations comprise a fundamental mechanism by which distant neural structures establish and express functional connectivity. Long-range functional connectivity between the hippocampus and other forebrain structures is enabled by theta oscillations. Here, we show for the first time that the infant rat red nucleus (RN)-a brainstem sensorimotor structure-exhibits theta (4-7 Hz) oscillations restricted primarily to periods of active (REM) sleep. At postnatal day 8 (P8), theta is expressed as brief bursts immediately following myoclonic twitches; by P12, theta oscillations are expressed continuously across bouts of active sleep...
May 3, 2017: Current Biology: CB
https://www.readbyqxmd.com/read/28466144/comparative-analysis-of-background-eeg-activity-in-childhood-absence-epilepsy-during-valproate-treatment-a-standardized-low-resolution-brain-electromagnetic-tomography-sloreta-study
#13
Jung-Hyun Shin, Tae-Hoon Eom, Young-Hoon Kim, Seung-Yun Chung, In-Goo Lee, Jung-Min Kim
Valproate (VPA) is an antiepileptic drug (AED) used for initial monotherapy in treating childhood absence epilepsy (CAE). EEG might be an alternative approach to explore the effects of AEDs on the central nervous system. We performed a comparative analysis of background EEG activity during VPA treatment by using standardized, low-resolution, brain electromagnetic tomography (sLORETA) to explore the effect of VPA in patients with CAE. In 17 children with CAE, non-parametric statistical analyses using sLORETA were performed to compare the current density distribution of four frequency bands (delta, theta, alpha, and beta) between the untreated and treated condition...
May 2, 2017: Neurological Sciences
https://www.readbyqxmd.com/read/28447844/frontal-theta-band-oscillations-predict-error-correction-and-posterror-slowing-in-typing
#14
Çığır Kalfaoğlu, Tom Stafford, Elizabeth Milne
Performance errors are associated with robust behavioral and electroencephalography (EEG) effects. However, there is a debate about the nature of the relationship between these effects and implicit versus explicit error awareness. Our aim was to study the relationship between error related electrophysiological effects, such as spectral perturbations in fronto-medial theta band oscillations (FMT), and error awareness in typing. Typing has an advantage as an experimental paradigm in that detected errors are quickly and habitually signaled by the participant using backspace, allowing separation of detected from undetected errors without interruption in behavior...
April 27, 2017: Journal of Experimental Psychology. Human Perception and Performance
https://www.readbyqxmd.com/read/28441570/neural-indices-of-phonemic-discrimination-and-sentence-level-speech-intelligibility-in-quiet-and-noise-a-p3-study
#15
Tess K Koerner, Yang Zhang, Peggy B Nelson, Boxiang Wang, Hui Zou
This study examined how speech babble noise differentially affected the auditory P3 responses and the associated neural oscillatory activities for consonant and vowel discrimination in relation to segmental- and sentence-level speech perception in noise. The data were collected from 16 normal-hearing participants in a double-oddball paradigm that contained a consonant (/ba/ to /da/) and vowel (/ba/ to /bu/) change in quiet and noise (speech-babble background at a -3 dB signal-to-noise ratio) conditions. Time-frequency analysis was applied to obtain inter-trial phase coherence (ITPC) and event-related spectral perturbation (ERSP) measures in delta, theta, and alpha frequency bands for the P3 response...
April 18, 2017: Hearing Research
https://www.readbyqxmd.com/read/28436834/active-auditory-experience-in-infancy-promotes-brain-plasticity-in-theta-and-gamma-oscillations
#16
Gabriella Musacchia, Silvia Ortiz-Mantilla, Naseem Choudhury, Teresa Realpe-Bonilla, Cynthia Roesler, April A Benasich
Language acquisition in infants is driven by on-going neural plasticity that is acutely sensitive to environmental acoustic cues. Recent studies showed that attention-based experience with non-linguistic, temporally-modulated auditory stimuli sharpens cortical responses. A previous ERP study from this laboratory showed that interactive auditory experience via behavior-based feedback (AEx), over a 6-week period from 4- to 7-months-of-age, confers a processing advantage, compared to passive auditory exposure (PEx) or maturation alone (Naïve Control, NC)...
April 15, 2017: Developmental Cognitive Neuroscience
https://www.readbyqxmd.com/read/28429067/neuronal-oscillations-and-synchronicity-associated-with-gamma-hydroxybutyrate-during-resting-state-in-healthy-male-volunteers
#17
Robin von Rotz, Michael Kometer, Dario Dornbierer, Jürg Gertsch, M Salomé Gachet, Franz X Vollenweider, Erich Seifritz, Oliver G Bosch, Boris B Quednow
RATIONALE: Gamma-hydroxybutyrate (GHB) is a putative neurotransmitter, a drug of abuse, an anesthetic agent, and a treatment for neuropsychiatric disorders. In previous electroencephalography (EEG) studies, GHB was shown to induce an electrophysiological pattern of "paradoxical EEG-behavioral dissociation" characterized by increased delta and theta oscillations usually associated with sleep during awake states. However, no detailed source localization of these alterations and no connectivity analyses have been performed yet...
April 20, 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28426128/hippocampal-electrical-stimulation-disrupts-associative-learning-when-targeted-at-dentate-spikes
#18
Miriam S Nokia, Irina Gureviciene, Tomi Waselius, Heikki Tanila, Markku Penttonen
Hippocampal electrophysiological oscillations, namely theta and ripples, have been implicated in encoding and consolidation of new memories, respectively. According to existing literature, hippocampal dentate spikes are prominent, short-duration (<30 ms), large-amplitude (∼2-4 mV) fluctuations in hilar local-field potentials that take place during awake immobility and sleep. Interestingly, previous studies indicate that during dentate spikes dentate gyrus granule cells increase their firing while firing of CA1 pyramidal cells are suppressed, thus resulting in momentary uncoupling of the two hippocampal subregions...
April 20, 2017: Journal of Physiology
https://www.readbyqxmd.com/read/28400257/phase-amplitude-coupled-persistent-theta-and-gamma-oscillations-in-rat-primary-motor-cortex-in%C3%A2-vitro
#19
Nicholas W Johnson, Mazhar Özkan, Adrian P Burgess, Emma J Prokic, Keith A Wafford, Michael J O'Neill, Stuart D Greenhill, Ian M Stanford, Gavin L Woodhall
In vivo, theta (4-7 Hz) and gamma (30-80 Hz) neuronal network oscillations are known to coexist and display phase-amplitude coupling (PAC). However, in vitro, these oscillations have for many years been studied in isolation. Using an improved brain slice preparation technique we have, using co-application of carbachol (10 μM) and kainic acid (150 nM), elicited simultaneous theta (6.6 ± 0.1 Hz) and gamma (36.6 ± 0.4 Hz) oscillations in rodent primary motor cortex (M1). Each oscillation showed greatest power in layer V...
April 8, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28396622/transcranial-magnetic-stimulation-reveals-intrinsic-perceptual-and-attentional-rhythms
#20
REVIEW
Laura Dugué, Rufin VanRullen
Oscillatory brain activity has functional relevance for perceptual and cognitive processes, as proven by numerous electrophysiology studies accumulating over the years. However, only within the past two decades have researchers been able to study the causal role of such oscillations using transcranial magnetic stimulation (TMS) technology. Two complementary approaches exist. A majority of research employs rhythmic TMS (rTMS) to entrain oscillatory activity and investigate its effect on targeted brain functions...
2017: Frontiers in Neuroscience
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