keyword
MENU ▼
Read by QxMD icon Read
search

Alpha Oscillations

keyword
https://www.readbyqxmd.com/read/28441570/neural-indices-of-phonemic-discrimination-and-sentence-level-speech-intelligibility-in-quiet-and-noise-a-p3-study
#1
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/28436151/whole-genome-sequence-association-and-ancestry-informed-polygenic-profile-of-eeg-alpha-in-a-native-american-population
#2
Qian Peng, Nicholas J Schork, Kirk C Wilhelmsen, Cindy L Ehlers
EEG alpha activity is the dominant oscillation in most adult humans, is highly heritable, and has been associated with a number of cognitive functions. Two EEG phenotypes, low- and high-voltage alpha (LVA & HVA), have been demonstrated to have high heritabilities. They have different prevalence depending on a population's ancestral origins. In the present study we assessed the influence of ancestry admixture on EEG alpha power, and conducted a whole genome sequencing association analysis and an ancestry-informed polygenic study on those phenotypes in a Native American (NA) population that has a high prevalence of LVA...
April 24, 2017: American Journal of Medical Genetics. Part B, Neuropsychiatric Genetics
https://www.readbyqxmd.com/read/28431691/sensorimotor-activity-measured-via-oscillations-of-eeg-mu-rhythms-in-speech-and-non-speech-discrimination-tasks-with-and-without-segmentation-demands
#3
David Thornton, Ashley W Harkrider, David Jenson, Tim Saltuklaroglu
Better understanding of the role of sensorimotor processing in speech and non-speech segmentation can be achieved with more temporally precise measures. Twenty adults made same/different discriminations of speech and non-speech stimuli pairs, with and without segmentation demands. Independent component analysis of 64-channel EEG data revealed clear sensorimotor mu components, with characteristic alpha and beta peaks, localized to premotor regions in 70% of participants.Time-frequency analyses of mu components from accurate trials showed that (1) segmentation tasks elicited greater event-related synchronization immediately following offset of the first stimulus, suggestive of inhibitory activity; (2) strong late event-related desynchronization in all conditions, suggesting that working memory/covert replay contributed substantially to sensorimotor activity in all conditions; (3) stronger beta desynchronization in speech versus non-speech stimuli during stimulus presentation, suggesting stronger auditory-motor transforms for speech versus non-speech stimuli...
April 18, 2017: Brain and Language
https://www.readbyqxmd.com/read/28428748/resting-state-neuroimaging-and-neuropsychological-findings-in-opioid-use-disorder-during-abstinence-a-review
#4
REVIEW
Hada Fong-Ha Ieong, Zhen Yuan
Dependence to opiates, including illicit heroin and prescription pain killers, and treatment of the opioid use disorder (OUD) have been longstanding problems over the world. Despite intense efforts to scientific investigation and public health care, treatment outcomes have not significantly improved for the past 50 years. One reason behind the continuing use of heroin worldwide despite such efforts is its highly addictive nature. Brain imaging studies over the past two decades have made significant contribution to the understanding of the addictive properties as to be due in part to biological processes, specifically those in the brain structure and function...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28394781/patterns-of-brain-oscillations-across-different-electrode-montages-in-transcranial-pulsed-current-stimulation
#5
Alejandra C Vasquez, Aurore Thibaut, Leon Morales-Quezada, Jorge Leite, Felipe Fregni
Transcranial pulsed current stimulation (tPCS) is a neuromodulatory technique that has been studied in the last decade. Several parameters have been assessed independently to optimize the effects. Our aim was to explore the effects of tPCS using different montages on cortical brain oscillations indexed by power spectrum and interhemispheric coherence in different electroencephalography frequency bands. Twenty healthy individuals were randomized to receive either active tPCS or sham intervention using the following bilateral montages: ear clip (conventional), ear hook, or mastoid placement...
May 24, 2017: Neuroreport
https://www.readbyqxmd.com/read/28393838/functional-polymorphisms-in-dopaminergic-genes-modulate-neurobehavioral-and-neurophysiological-consequences-of-sleep-deprivation
#6
Sebastian C Holst, Thomas Müller, Amandine Valomon, Britta Seebauer, Wolfgang Berger, Hans-Peter Landolt
Sleep deprivation impairs cognitive performance and reliably alters brain activation in wakefulness and sleep. Nevertheless, the molecular regulators of prolonged wakefulness remain poorly understood. Evidence from genetic, behavioral, pharmacologic and imaging studies suggest that dopaminergic signaling contributes to the behavioral and electroencephalographic (EEG) consequences of sleep loss, although direct human evidence thereof is missing. We tested whether dopamine neurotransmission regulate sustained attention and evolution of EEG power during prolonged wakefulness...
April 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28390217/painful-engrams-oscillatory-correlates-of-working-memory-for-phasic-nociceptive-laser-stimuli
#7
Elia Valentini, Valentina Nicolardi, Salvatore Maria Aglioti
Research suggests that working memory (WM) is impaired in chronic pain. Yet, information on how potentially noxious stimuli are maintained in memory is limited in patients as well as in healthy people. We recorded electroencephalography (EEG) in healthy volunteers during a modified delayed match-to-sample task where maintenance in memory of relevant attributes of nociceptive laser stimuli was essential for subsequent cued-discrimination. Participants performed in high and low load conditions (i.e. three vs...
April 5, 2017: Brain and Cognition
https://www.readbyqxmd.com/read/28385876/concurrent-tacs-fmri-reveals-causal-influence-of-power-synchronized-neural-activity-on-resting-state-fmri-connectivity
#8
Marc Bächinger, Valerio Zerbi, Marius Moisa, Rafael Polania, Quanying Liu, Dante Mantini, Christian Ruff, Nicole Wenderoth
Resting state fMRI (rs-fMRI) is commonly used to study the brain's intrinsic neural coupling, which reveals specific spatiotemporal patterns in the form of resting state networks (RSN). It has been hypothesized that slow rs-fMRI oscillations (<0.1 Hz) are driven by underlying electrophysiological rhythms that typically occur at much faster timescales (>5 Hz); however, causal evidence for this relationship is currently lacking. Here we measured rs-fMRI in humans while applying transcranial alternating current stimulation (tACS) to entrain brain rhythms in left and right sensorimotor cortices...
April 6, 2017: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/28385625/alpha-oscillations-underlie-working-memory-abnormalities-in-the-psychosis-high-risk-state
#9
Avinash Ramyead, Michael Kometer, Erich Studerus, Denise Baumeler, Robin von Rotz, Anita Riecher-Rössler
Working memory (WM) functioning, known to be modulated by neural oscillations, is impaired in schizophrenic psychoses. It remains unclear whether in the psychosis high-risk state, WM encoding is altered or whether patients are impaired at shielding their WM against distractors. We employed single-trial analyses of neurophysiological and behavioral data recorded during a WM paradigm, designed to include predictable distractors, on 18 patients with an at-risk mental state for psychosis (ARMS, 26.1±5.45 years) and 21 healthy controls (HCs, 25...
April 3, 2017: Biological Psychology
https://www.readbyqxmd.com/read/28382759/development-of-infant-sustained-attention-and-its-relation-to-eeg-oscillations-an-eeg-and-cortical-source-analysis-study
#10
Wanze Xie, Brittany M Mallin, John E Richards
The current study examined the relation between infant sustained attention and infant EEG oscillations. Fifty-nine infants were tested at 6 (N = 15), 8 (N = 17), 10 (N = 14), and 12 (N = 13) months. Three attention phases, stimulus orienting, sustained attention, and attention termination, were defined based on infants' heart rate changes. Frequency analysis using simultaneously recorded EEG focused on infant theta (2-6 Hz), alpha (6-9 Hz), and beta (9-14 Hz) rhythms. Cortical source analysis of EEG oscillations was conducted with realistic infant MRI models...
April 5, 2017: Developmental Science
https://www.readbyqxmd.com/read/28382013/beyond-the-peak-tactile-temporal-discrimination-does-not-correlate-with-individual-peak-frequencies-in-somatosensory-cortex
#11
Thomas J Baumgarten, Alfons Schnitzler, Joachim Lange
The human sensory systems constantly receive input from different stimuli. Whether these stimuli are integrated into a coherent percept or segregated and perceived as separate events, is critically determined by the temporal distance of the stimuli. This temporal distance has prompted the concept of temporal integration windows or perceptual cycles. Although this concept has gained considerable support, the neuronal correlates are still discussed. Studies suggested that neuronal oscillations might provide a neuronal basis for such perceptual cycles, i...
2017: Frontiers in Psychology
https://www.readbyqxmd.com/read/28378515/cross-sensory-modulation-of-alpha-oscillatory-activity-suppression-idling-and-default-resource-allocation
#12
Rosanne Maria van Diepen, Ali Mazaheri
Alpha oscillations (~10 Hz) have been suggested to have an inhibitory influence on stimulus processing within the context of attention being coordinated across space, with an increase in the power of alpha activity occurring in spatially irrelevant regions. However, with respect to cross-sensory attention (distribution of attention to different sensory modalities) an increase in alpha activity from baseline has not yet been definitively linked to active inhibition of distraction. In the current study, we examined the role of top-down alpha modulation in facilitating and suppressing stimulus processing between the visual and auditory domain...
April 4, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28370471/motor-deficits-and-beta-oscillations-are-dissociable-in-an-alpha-synuclein-model-of-parkinson-s-disease
#13
Ivani Brys, Jessica Nunes, Romulo Fuentes
Parkinson's disease (PD) is a neurodegenerative disorder characterized by progressive motor symptoms resulting from chronic loss of dopaminergic neurons in the nigrostriatal pathway. The over expression of the protein alpha-synuclein in the substantia nigra has been used to induce progressive dopaminergic neuronal loss and to reproduce key histopathological and temporal features of PD in animal models. However the neurophysiological aspects of the alpha-synuclein PD model have been poorly characterized. Hereby we performed chronic in vivo electrophysiological recordings in the corticostriatal circuit of rats injected with viral vector to over express alpha-synuclein in the right substantia nigra...
March 30, 2017: European Journal of Neuroscience
https://www.readbyqxmd.com/read/28358658/supramodal-theta-gamma-and-sustained-fields-predict-modality-specific-modulations-of-alpha-and-beta-oscillations-during-visual-and-tactile-working-memory
#14
Freek van Ede, Ole Jensen, Eric Maris
Flexible control over currently relevant sensory representations is an essential feature of primate cognition. We investigated the neurophysiological bases of such flexible control in humans during an intermodal working memory task in which participants retained visual or tactile sequences. Using magnetoencephalography, we first show that working memory retention engages early visual and somatosensory areas, as reflected in the sustained load-dependent suppression of alpha and beta oscillations. Next, we identify three components that are also load dependent but modality independent: medial prefrontal theta synchronization, frontoparietal gamma synchronization, and sustained parietal event-related fields...
March 30, 2017: Journal of Cognitive Neuroscience
https://www.readbyqxmd.com/read/28346344/increased-force-variability-is-associated-with-altered-modulation-of-the-motorneuron-pool-activity-in-autism-spectrum-disorder-asd
#15
Zheng Wang, Minhyuk Kwon, Suman Mohanty, Lauren M Schmitt, Stormi P White, Evangelos A Christou, Matthew W Mosconi
Force control deficits have been repeatedly documented in autism spectrum disorder (ASD). They are associated with worse social and daily living skill impairments in patients suggesting that developing a more mechanistic understanding of the central and peripheral processes that cause them may help guide the development of treatments that improve multiple outcomes in ASD. The neuromuscular mechanisms underlying force control deficits are not yet understood. Seventeen individuals with ASD and 14 matched healthy controls completed an isometric index finger abduction test at 60% of their maximum voluntary contraction (MVC) during recording of the first dorsal interosseous (FDI) muscle to determine the neuromuscular processes associated with sustained force variability...
March 25, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28340443/quantitative-eeg-abnormalities-in-major-depressive-disorder-with-basal-ganglia-stroke-with-lesions-in-different-hemispheres
#16
Chunfang Wang, Yuanyuan Chen, Ying Zhang, Jin Chen, Xiaojing Ding, Dong Ming, Jingang Du
BACKGROUND: This study aimed to examine the aberrant EEG oscillation in major depressive subjects with basal ganglia stroke with lesions in different hemispheres. METHODS: Resting EEG of 16 electrodes in 58 stroke subjects, 26 of whom had poststroke depression (13 with left-hemisphere lesion and 13 with right) and 32 of whom did not (18 with left lesion and 14 with right), was recorded to obtain spectral power analysis for several frequency bands. Multiple analysis of variance and receiver operating characteristic (ROC) curves were used to identify differences between poststroke depression (PSD) and poststroke non-depression (PSND), treating the different lesion hemispheres separately...
February 28, 2017: Journal of Affective Disorders
https://www.readbyqxmd.com/read/28334965/photosensitive-epilepsy-is-associated-with-reduced-inhibition-of-alpha-rhythm-generating-networks
#17
Anna Elisabetta Vaudano, Andrea Ruggieri, Pietro Avanzini, Giuliana Gessaroli, Gaetano Cantalupo, Antonietta Coppola, Sanjay M Sisodiya, Stefano Meletti
See Hamandi (doi:10.1093/awx049) for a scientific commentary on this article.Photosensitivity is a condition in which lights induce epileptiform activities. This abnormal electroencephalographic response has been associated with hyperexcitability of the visuo-motor system. Here, we evaluate if intrinsic dysfunction of this network is present in brain activity at rest, independently of any stimulus and of any paroxysmal electroencephalographic activity. To address this issue, we investigated the haemodynamic correlates of the spontaneous alpha rhythm, which is considered the hallmark of the brain resting state, in photosensitive patients and in people without photosensitivity...
April 1, 2017: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/28334214/tdcs-modulates-visual-gamma-oscillations-and-basal-alpha-activity-in-occipital-cortices-evidence-from-meg
#18
Tony W Wilson, Timothy J McDermott, Mackenzie S Mills, Nathan M Coolidge, Elizabeth Heinrichs-Graham
Transcranial direct-current stimulation (tDCS) is now a widely used method for modulating the human brain, but the resulting physiological effects are not understood. Recent studies have combined magnetoencephalography (MEG) with simultaneous tDCS to evaluate online changes in occipital alpha and gamma oscillations, but no study to date has quantified the offline (i.e., after tDCS) alterations in these responses. Thirty-five healthy adults received active or sham anodal tDCS to the occipital cortices, and then completed a visual stimulation paradigm during MEG that is known to elicit robust gamma and alpha oscillations...
March 10, 2017: Cerebral Cortex
https://www.readbyqxmd.com/read/28323013/electroencephalographic-sensorimotor-rhythms-are-modulated-in-the-acute-phase-following-focal-vibration-in-healthy-subjects
#19
Susanna Lopez, Fabiano Bini, Claudio Del Percio, Franco Marinozzi, Claudia Celletti, Antonio Suppa, Raffaele Ferri, Emanuela Staltari, Filippo Camerota, Claudio Babiloni
Few minutes of focal vibration (FV) on limb muscles can improve motor control in neurological (stroke, Parkinson) patients for unknown underlying neurophysiological mechanisms. Here we hypothesized that in healthy volunteers this FV would increase excitability in the primary sensorimotor cortex (S1-M1) during an isometric contraction of the stimulated muscle. The design included an initial control condition with no FV stimulation (Baseline) as well as three short experimental sessions of FV and a Sham (fake) session in a pseudo-random order...
March 17, 2017: Neuroscience
https://www.readbyqxmd.com/read/28323009/investigation-of-the-effects-of-transcranial-alternating-current-stimulation-tacs-on-self-paced-rhythmic-movements
#20
Manuel Varlet, Alanna Wade, Giacomo Novembre, Peter E Keller
Human rhythmic movements spontaneously entrain to external rhythmic stimuli. Such sensory-motor entrainment can attract movements to different tempi and enhance their efficiency, with potential clinical applications for motor rehabilitation. Here we investigate whether entrainment of self-paced rhythmic movements can be induced via transcranial alternating current stimulation (tACS), which uses alternating currents to entrain spontaneous brain oscillations at specific frequencies. Participants swung a handheld pendulum at their preferred tempo with the right hand while tACS was applied over their left or right primary motor cortex at frequencies equal to their preferred tempo (Experiment 1) or in the alpha (10Hz) and beta (20Hz) ranges (Experiment 2)...
March 18, 2017: Neuroscience
keyword
keyword
38268
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"