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Beta rhythm

Lars Wojtecki, Saskia Elben, Jan Vesper, Alfons Schnitzler
We investigated neurophysiological mechanisms of subthalamic nucleus involvement in verbal fluency by means of a verbal generation task. The subthalamic nucleus is thought to act as a behavioural go/no-go instance by means of oscillatory communication in theta band with the prefrontal cortex. Because subthalamic alpha-theta frequency stimulation has been shown to exert beneficial effects on verbal fluency in Parkinson's disease, we hypothesized that an alpha-theta oscillatory network involving the subthalamic nucleus underlies verbal generation task performance as a gating instance for speech execution...
October 8, 2016: European Journal of Neuroscience
Jesus Minguillon, Miguel A Lopez-Gordo, Francisco Pelayo
Stress assessment has been under study in the last years. Both biochemical and physiological markers have been used to measure stress level. In neuroscience, several studies have related modification of stress level to brain activity changes in limbic system and frontal regions, by using non-invasive techniques such as functional magnetic resonance imaging (fMRI) and electroencephalography (EEG). In particular, previous studies suggested that the exhibition or inhibition of certain brain rhythms in frontal cortical areas indicates stress...
2016: Frontiers in Computational Neuroscience
Marina Maria Bellet, Selma Masri, Giuseppe Astarita, Paolo Sassone-Corsi, Maria Agnese Della Fazia, Giuseppe Servillo
Liver regeneration offers a distinctive opportunity to study cell proliferation in vivo. Mammalian Silent information regulator 1 (SIRT1), a NAD(+)-dependent histone deacetylase, is an important regulator of various cellular processes, including proliferation, metabolism and circadian rhythms. In the liver, SIRT1 coordinates the circadian oscillation of clock-controlled genes, including genes that encode enzymes involved in metabolic pathways. We performed partial hepatectomy in WT and liver-specific Sirt1 deficient mice and analysed the expression of cell cycle regulators in liver samples taken at different times during the regenerative process, by real time PCR, western blotting and immunohistochemistry...
September 15, 2016: Journal of Biological Chemistry
Voyko Kavcic, Bojan Zalar, Bruno Giordani
The finding that some older individuals report declines in aspects of cognitive functioning is becoming a frequently used criteria to identify elderly at risk for mild cognitive impairment (MCI) and dementia. Once concerns are identified in a community setting, however, effective means are necessary to pinpoint those individuals who should go on to more complex and costly diagnostic evaluations (e.g., functional imaging). We tested 44 African American volunteers endorsing cognitive concerns (37 females, 7 males) age≥65years with CogState battery subtests and recorded resting-state EEG, with eyes closed...
September 6, 2016: International Journal of Psychophysiology
A Korik, R Sosnik, N Siddique, D Coyle
A motion trajectory prediction (MTP) - based brain-computer interface (BCI) aims to reconstruct the three-dimensional (3D) trajectory of upper limb movement using electroencephalography (EEG). The most common MTP BCI employs a time series of bandpass-filtered EEG potentials (referred to here as the potential time-series, PTS, model) for reconstructing the trajectory of a 3D limb movement using multiple linear regression. These studies report the best accuracy when a 0.5-2Hz bandpass filter is applied to the EEG...
2016: Progress in Brain Research
Sergiu P Darabant, Irwin Hoffman
No abstract text is available yet for this article.
August 25, 2016: New England Journal of Medicine
Alexander Sorisky
No abstract text is available yet for this article.
August 25, 2016: New England Journal of Medicine
Jesus A Barea-Mendoza, Renata García-Gigorro, Emilio Renes-Carreño
No abstract text is available yet for this article.
August 25, 2016: New England Journal of Medicine
Marc-Olivier Fischer, Jean-Luc Fellahi, Emmanuel Lorne
No abstract text is available yet for this article.
August 25, 2016: New England Journal of Medicine
A Marc Gillinov, Patrick T O'Gara, Michael J Mack
No abstract text is available yet for this article.
August 25, 2016: New England Journal of Medicine
Mina Amiri, Birgit Frauscher, Jean Gotman
The interactions between different EEG frequency bands have been widely investigated in normal and pathologic brain activity. Phase-amplitude coupling (PAC) is one of the important forms of this interaction where the amplitude of higher frequency oscillations is modulated by the phase of lower frequency activity. Here, we studied the dynamic variations of PAC of high (gamma and ripple) and low (delta, theta, alpha, and beta) frequency bands in patients with focal epilepsy in different sleep stages during the interictal period, in an attempt to see if coupling is different in more or less epileptogenic regions...
2016: Frontiers in Human Neuroscience
Dagmara Bartczak, Łukasz Szymański, Paweł Bodera, Wanda Stankiewicz
AIM OF THE STUDY: Due to their prevalence and negative social effects, cardiovascular diseases belong to a group of civilization diseases. Previous research suggests comorbidity of heart diseases, mood disorders and impaired cognitive functioning. The aim of this study was to evaluate the psychoneuroimmunological aspects of functioning in patients diagnosed with cardiovascular diseases. MATERIAL AND METHODS: Ten persons, mean age 48.2 years old, diagnosed with primary hypertension, were studied...
2016: Central-European Journal of Immunology
Loek Brinkman, Arjen Stolk, Tom R Marshall, Sophie Esterer, Poppy Sharp, H Chris Dijkerman, Floris P de Lange, Ivan Toni
UNLABELLED: To select a movement, specific neuronal populations controlling particular features of that movement need to be activated, whereas other populations are downregulated. The selective (dis)inhibition of cortical sensorimotor populations is governed by rhythmic neural activity in the alpha (8-12 Hz) and beta (15-25 Hz) frequency range. However, it is unclear whether and how these rhythms contribute independently to motor behavior. Building on a recent dissociation of the sensorimotor alpha- and beta-band rhythms, we test the hypothesis that the beta-band rhythm governs the disinhibition of task-relevant neuronal populations, whereas the alpha-band rhythm suppresses neurons that may interfere with task performance...
August 17, 2016: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
Giulia Tacchino, Marta Gandolla, Stefania Coelli, Riccardo Barbieri, Alessandra Pedrocchi, Anna Maria Bianchi
Two key ingredients of a successful neuro-rehabilitative intervention have been identified as intensive and repetitive training and subject's active participation, which can be coupled in an active robot-assisted training. To exploit these two elements, we recorded electroencephalography, electromyography and kinematics signals from 9 healthy subjects performing a 2×2 factorial design protocol, with subject's volitional intention and robotic glove assistance as factors. We quantitatively evaluated primary sensorimotor, premotor and supplementary motor areas activation during movement execution by computing Event-Related Desynchronization (ERD) patterns associated to mu and beta rhythms...
August 2, 2016: IEEE Transactions on Neural Systems and Rehabilitation Engineering
Kanako Ito, Yu-Ki Iwasaki, Yuhi Fujimoto, Eiichiro Oka, Kenta Takahashi, Ippei Tsuboi, Kenji Yodogawa, Meiso Hayashi, Yasushi Miyauchi, Wataru Shimizu
A 46-year-old man was admitted to our hospital for near syncope and palpitations. An electrocardiogram showed a common type of atrial flutter (AFL) with 1:1 atrioventricular conduction. Transthoracic echocardiography revealed a massive right atrial (RA) thrombus with a huge RA and right ventricle. The patient was diagnosed with arrhythmogenic right ventricular cardiomyopathy. It was difficult to control the heart rate with beta-blockers during AFL, which resulted in the deterioration of right-sided heart failure...
2016: Internal Medicine
Christina Schmiedt-Fehr, Birgit Mathes, Shwetha Kedilaya, Janna Krauss, Canan Basar-Eroglu
OBJECTIVES: This study compared sensorimotor alpha and beta brain oscillations in young and older adults, to examine their functional distinctness and susceptibility to aging. METHODS: Electroencephalographic data were compared between young (age 23±3) and older adults (age 64±7) in terms of event-related spectral perturbation in alpha and beta bands during a go/nogo task. RESULTS: Age selectively influenced beta rhythms, with younger compared to older adults showing, first, less attenuation during movement preparation and execution, and, second, a greater rebound after movement end...
October 2016: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
Bryan S Baxter, Bradley J Edelman, Nicholas Nesbitt, Bin He
BACKGROUND: Transcranial direct current stimulation (tDCS) has been used to alter the excitability of neurons within the cerebral cortex. Improvements in motor learning have been found in multiple studies when tDCS was applied to the motor cortex before or during task learning. The motor cortex is also active during the performance of motor imagination, a cognitive task during which a person imagines, but does not execute, a movement. Motor imagery can be used with noninvasive brain computer interfaces (BCIs) to control virtual objects in up to three dimensions, but to master control of such devices requires long training times...
July 15, 2016: Brain Stimulation
Eleonora Bartoli, Laura Maffongelli, Claudio Campus, Alessandro D'Ausilio
During speech listening motor regions are somatotopically activated, resembling the activity that subtends actual speech production, suggesting that motor commands can be retrieved from sensory inputs. Crucially, the efficient motor control of the articulators relies on the accurate anticipation of the somatosensory reafference. Nevertheless, evidence about somatosensory activities elicited by auditory speech processing is sparse. The present work looked for specific interactions between auditory speech presentation and somatosensory cortical information processing...
2016: Scientific Reports
I I Knyazkova, N V Kuzminova, N Yu Osovskaya
The aim of this study was to investigate the influence of antihypertensive therapy with adding of gamma-amino-beta-phenylbutyric acid hydrochloride on the autonornic regulation of tcardiovascular system and the psychoemotional status in young men with hypertension. The study included 58 male with hypertension, aged 18-39 years (mean age 31.7 yearst 2.3 years), of them 28 patients (group I) administered beta-blocker and the other received a complex therapy which included beta-blocker and gamma-amino-beta-phenylbutyric acid hydrochiotide--Noofen ("OlainFarm", Latvia) 250 mg 3 times a day for 4 weeks...
October 2015: Likars'ka Sprava
Maxwell A Sherman, Shane Lee, Robert Law, Saskia Haegens, Catherine A Thorn, Matti S Hämäläinen, Christopher I Moore, Stephanie R Jones
Human neocortical 15-29-Hz beta oscillations are strong predictors of perceptual and motor performance. However, the mechanistic origin of beta in vivo is unknown, hindering understanding of its functional role. Combining human magnetoencephalography (MEG), computational modeling, and laminar recordings in animals, we present a new theory that accounts for the origin of spontaneous neocortical beta. In our MEG data, spontaneous beta activity from somatosensory and frontal cortex emerged as noncontinuous beta events typically lasting <150 ms with a stereotypical waveform...
August 16, 2016: Proceedings of the National Academy of Sciences of the United States of America
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