Results 161 to 170 of about 91,087 (194)
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Fast (beta) rhythms in the hippocampus: A review
Hippocampus, 1992AbstractSpontaneous or evoked brain activity in the hippocampus showed a 20–70 Hz beta rhythm under some conditions, typically during behavioral activation and accompanied by a theta rhythm. Beta rhythms are generated locally, perhaps by a recurrent feedback loop involving pyramidal cells and inhibitory interneurons. Modulation of the local circuit and
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Effect of beta-blockers on the heart rhythm complexity in children
2011 IEEE International Conference on Systems, Man, and Cybernetics, 2011Beta-blockers are often used in the treatment of various heart diseases and affect the heart rate variability. In this study we aimed to assess the effect of various types of beta-blockers on the heart rate complexity in children using the multiscale entropy and detrended fluctuation analysis (DFA).
Ahmet Ugur, Selman Nas, Volkan Tuzcu
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Theta and beta rhythm in the electroencephalograms of normal adults
Electroencephalography and Clinical Neurophysiology, 1951Abstract 1. 1. Low voltage theta activity was detected in 64 per cent of a group of 161 young normal adults and in 24 per cent of 50 mentally normal seniles, the differences between the two groups being significant at the one per cent level. This decrease of theta incidence with increasing age was discussed in relation to maturation processes ...
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Stability analysis on beta rhythm in CA1 region
International Conference on Neural Networks and Signal Processing, 2003. Proceedings of the 2003, 2003Rhythms in the gamma range and the beta range are associated with attention, perception, and cognition. Therefore, the mechanism of how long-distance synchrony between participating sites is achieved becomes one of the important issues of neuroscience.
null Dong-Uk Hwang +3 more
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Effects of Handedness on Movement-Related Changes of Central Beta Rhythms
Journal of Clinical Neurophysiology, 1997The effects of handedness on the movement-related changes in beta rhythms (14-30 Hz) in the left and right perirolandic area were analyzed in 12 right-handed and 11 left-handed subjects. The motor task consisted of unilateral brisk or slow self-paced extension of the right or left index finger. The handedness effects were as follows.
A, Stancák, G, Pfurtscheller
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BETA‐RECEPTOR BLOCKADE IN MAINTENANCE OF SINUS RHYTHM OBTAINED BY ELECTROCONVERSION
Acta Medica Scandinavica, 1969Abstract. The effectiveness of beta‐receptor blockade as maintenance treatment of sinus rhythm obtained by electroconversion has been evaluated. Out of 98 consecutive patients with chronic atrial fibrillation 74 were converted and controlled at regular intervals. After three months only 27 of the 74 patients remained in sinus rhythm.
L, Hillestad, A, Andersen
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Investigating the Role of Alpha and Beta Rhythms in Functional Motor Networks
Neuroscience, 2018It is recognized that lower electroencephalography (EEG) frequencies correspond to distributed brain activity over larger spatial regions than higher frequencies and are associated with coordination. In motor processes it has been suggested that this is not always the case. Our objective was to explore this contradiction.
Alkinoos, Athanasiou +5 more
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Diurnal rhythm of beta-endorphin in neonates.
Developmental pharmacology and therapeutics, 1989In an attempt to prove whether beta-endorphin diurnal rhythm existed in neonates, 17 infants with a mean (+/- SD) gestational age of 31.7 +/- 4.8 weeks and a birth weight of 1,790 +/- 898 g were studied at a mean postnatal age of 3.3 +/- 0.5 days. Plasma samples were obtained from a pre-existing umbilical arterial line at 09.00 h, noon and 15.00 h ...
K, Sankaran, W, Hindmarsh, L, Tan
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Circadian rhythms of beta-endorphin in the aged.
Zeitschrift fur Gerontologie, 1986A circadian rhythm for beta-endorphin was observed by means of the cosinor method in aged subjects. The rhythm mesor is a little lower but its amplitude is more extended than in young subjects. The confidence intervals of the acrophases of the two groups are superimposable with a timing in the morning.
G, Casale +3 more
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Co-Maturation of Theta and Low-beta Rhythms During Child Development
Brain Topography, 2014The present report examines a possible co-maturation pattern between different frequency ranges on the spontaneous electroencephalogram (EEG) during development in childhood, adolescence and young adulthood. One hundred and sixty-seven subjects, between 6 and 26 years old were recorded during 3 min of spontaneous EEG.
Elena I, Rodríguez-Martínez +3 more
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