نتایج جستجو برای: beta rhythm

تعداد نتایج: 217036  

Journal: :Journal of neurophysiology 2007
Andrea Bibbig Steven Middleton Claudia Racca Martin J Gillies Helen Garner Fiona E N Lebeau Ceri H Davies Miles A Whittington

Generation of gamma rhythms in reciprocally connected areas of cortex produces synchronous neuronal firing, although little is known about the consequences of gamma rhythms when generated in nonreciprocally connected regions. This nonreciprocity exists in hippocampus, where gamma rhythms are generated in area CA3 in vitro and in vivo and nonreciprocally projected to area CA1 by the Schaffer col...

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Journal: :Proceedings of the National Academy of Sciences of the United States of America 2000
N Kopell G B Ermentrout M A Whittington R D Traub

Experimental and modeling efforts suggest that rhythms in the CA1 region of the hippocampus that are in the beta range (12-29 Hz) have a different dynamical structure than that of gamma (30-70 Hz). We use a simplified model to show that the different rhythms employ different dynamical mechanisms to synchronize, based on different ionic currents. The beta frequency is able to synchronize over lo...

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Journal: :Journal of neurophysiology 2009
Stephanie R Jones Dominique L Pritchett Michael A Sikora Steven M Stufflebeam Matti Hämäläinen Christopher I Moore

Variations in cortical oscillations in the alpha (7-14 Hz) and beta (15-29 Hz) range have been correlated with attention, working memory, and stimulus detection. The mu rhythm recorded with magnetoencephalography (MEG) is a prominent oscillation generated by Rolandic cortex containing alpha and beta bands. Despite its prominence, the neural mechanisms regulating mu are unknown. We characterized...

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2016
Adam Fry Karen J. Mullinger George C. O'Neill Eleanor L. Barratt Peter G. Morris Markus Bauer Jonathan P. Folland Matthew J. Brookes

Movement induced modulation of the beta rhythm is one of the most robust neural oscillatory phenomena in the brain. In the preparation and execution phases of movement, a loss in beta amplitude is observed [movement related beta decrease (MRBD)]. This is followed by a rebound above baseline on movement cessation [post movement beta rebound (PMBR)]. These effects have been measured widely, and r...

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Journal: Journal of Biomedical Physics and Engineering 2020
A Motealleh A Zamani, S Pirouzi, Sh Taghizadeh Z Bagheri

Background: Muscle fatigue has been known to influence brain activity, but very little is known about how cortical centers respond to muscle fatigue.Objective: This study was conducted to investigate the effects of muscle contraction and fatigue induced by two different percents of maximal voluntary contraction (MVC) on Electroencephalography (EEG) signals.Material and Methods: In t...

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Journal: :Heart 1997
J W Sayer P Wilkinson K Ranjadayalan S Ray B Marchant A D Timmis

OBJECTIVES To examine the circadian, seasonal, and weekly rhythms of acute myocardial infarction, and to identify subgroups in whom the rhythms are attenuated or absent to provide further information about the mechanisms of the rhythms and the processes responsible for triggering plaque events. DESIGN AND SETTING Prospective, observational study in a general hospital. PATIENTS AND METHODS 1...

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Journal: :Frontiers in Systems Neuroscience 2021

Beta oscillations have been predominantly observed in sensorimotor cortices and basal ganglia structures they are thought to be involved somatosensory processing motor control. Although beta activity is a distinct feature of healthy pathological processing, the role this rhythm still under debate. Here we review recent findings about during experimental manipulations (i.e., drugs brain stimulat...

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Journal: :European Heart Journal Supplements 2022

Abstract Introduction Landiolol is a recently innovated ultra-short-acting beta-blocker. the only beta-blocker with specific dose recommendation for patients cardiac dysfunction and acute atrial fibrillation (Class I according to ESC guidelines). has shorter elimination half-life than any other beta-blocker, it can be administered safely various tachyarrhythmias. The short duration of action ti...

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Journal: :Heart 2000
J W Sayer B Marchant S V Gelding J A Cooper A D Timmis

OBJECTIVE To assess the role of beta cell failure in the development of autonomic dysfunction in patients with coronary artery disease. DESIGN Autonomic function was measured by standard clinical methods and by heart rate variability in 24 type II diabetic and 24 non-diabetic subjects with coronary artery disease. Quantitative estimates of pancreatic beta cell function (%beta) and insulin res...

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2017
Tero Penttilä Heikki Mäkynen Juha Hartikainen Harri Hyppölä Timo Lauri Mika Lehto Juha Lund MJ Pekka Raatikainen Pekka Raatikainen Mika Lehto Aleksi Almenoksa Juha Koskinen Sergei Kesonen Jyri Veräjänkorva Kimmo Salmio Juhani Metsäniitty Laura Mikkonen Jouni Nurmi Risto Viitanen Jukka Vaahersalo Jukka Rinne Risto Pajari Jani Mononen Anna-Mari Hekkala Laura Moring Bernd Günther Juha Lund Jarkko Karihuhta Jon Holmström Juho Lindberg Anja Toljamo Jonna Juhola Marjatta Strandberg Tuula Meinander Heikki Mäkynen Tero Penttilä Ville Hällberg Tapio Innamaa Hanna Suurmunne Jari Nyrhilä Katja Jokela Peeter Kasemets Juha Hartikainen Matti Onnela Harri Hyppölä Kai Nyman Pirjo Mustonen Tuomas Rissanen Jaana Luukkonen Pertti Salmi Pekka Salminen Teemu Lasanen Matti Kettunen Timo Lauri Ari Toppinen Jussi Sia Hanna Tormilainen Magnus Hagnäs Tapio Åman Liisa Miettinen Niilo Keränen

BACKGROUND Atrial fibrillation (AF) is a common arrhythmia that causes numerous visits to emergency departments (ED). The aim of the FinFib2 study was to evaluate whether treatment of patients with AF in ED is consistent with the contemporary European Society of Cardiology (ESC) management guidelines. Here we report the results of antiarrhythmic drug therapy (AAD) in ED. METHODS All patients ...

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  • " +i+ "
    • "; pgn_html+=pgn_li; } document.getElementById("pgn-ul").innerHTML=pgn_html var pgn_links = document.querySelectorAll('.mypgn'); pgn_links.forEach(function(pgn_link) { pgn_link.addEventListener('click', paginate) }) } function post_and_fetch(data,url) { showLoading() xhr = new XMLHttpRequest(); xhr.open('POST', url, true); xhr.setRequestHeader('Content-Type', 'application/json; charset=UTF-8'); xhr.onreadystatechange = function() { if (xhr.readyState === 4 && xhr.status === 200) { var resp = xhr.responseText; resp_json=JSON.parse(resp) resp_place = document.getElementById("search_result_div") resp_place.innerHTML = resp_json['results'] search_meta = resp_json['meta'] update_search_meta(search_meta) update_pagination() hideLoading() } }; xhr.send(JSON.stringify(data)); } function unfilter() { url=/search_year_filter/ var term=document.getElementById("search_meta_data").dataset.term var data={ "year":"unfilter", "term":term, "pgn":1 } filtered_res=post_and_fetch(data,url) } function deactivate_all_bars(){ var yrchart = document.querySelectorAll('.ct-bar'); yrchart.forEach(function(bar) { bar.dataset.active = false bar.style = "stroke:#71a3c5;" }) } year_chart.on("created", function() { var yrchart = document.querySelectorAll('.ct-bar'); yrchart.forEach(function(check) { check.addEventListener('click', checkIndex); }) }); function checkIndex(event) { var yrchart = document.querySelectorAll('.ct-bar'); var year_bar = event.target if (year_bar.dataset.active == "true") { unfilter_res = unfilter() year_bar.dataset.active = false year_bar.style = "stroke:#1d2b3699;" } else { deactivate_all_bars() year_bar.dataset.active = true year_bar.style = "stroke:#e56f6f;" filter_year = chart_data['labels'][Array.from(yrchart).indexOf(year_bar)] url=/search_year_filter/ var term=document.getElementById("search_meta_data").dataset.term var data={ "year":filter_year, "term":term, "pgn":1 } filtered_res=post_and_fetch(data,url) } } function showLoading() { document.getElementById("loading").style.display = "block"; setTimeout(hideLoading, 10000); // 10 seconds } function hideLoading() { document.getElementById("loading").style.display = "none"; } -->