The existence of a cryptic stationary focus of excitation induced in the cortex by rhythmic electrical stimulation of the paw was detected using sound test stimuli which were previously indifferent to the experimental animals. Neuron activity was recorded in the sensorimotor cortex of rabbits. Neuron pairs were identified which operated in a correlated fashion in the dominant focus. Analysis of linked spike activity in such neuron pairs demonstrated the predominant appearance of linked spikes with intervals of about 2 sec when the focus was created by stimulation with a 2-sec rhythm; intervals were at or about 3 sec when the focus was created by stimulation with a 3-sec rhythm. The studies demonstrated that long-term persistence of the rhythmic nature of the dominant focus occurred at the level of interneuron interactions, i.e., it was a system process. The assimilated rhythm in linked cell activity was observed not only at the point of summation, when output was sent to an effector-i.e., when the dominant was realized as a movement response-but also in the intervals between test stimuli.
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Narra J
December 2024
Medical Research Unit, School of Medicine, Universitas Syiah Kuala, Banda Aceh, Indonesia.
The waning immunity following the COVID-19 vaccination become a significant concern and the immunological dynamics of vaccine-induced antibodies after vaccination need to be explored. The aim of this study was to compare anti-SARS-CoV-2 receptor-binding domain (RBD) antibody levels before and after a booster dose with heterologous COVID-19 vaccine and to identify factors influencing the levels after receiving the booster dose. A cross-sectional study was conducted in which individuals who received primary doses of CoronaVac and a booster dose with an mRNA-based vaccine were recruited using a purposive sampling technique.
View Article and Find Full Text PDFCardiol Rev
January 2025
Ghulam Muhammad Mahar Medical College, Sukkur, Pakistan.
Obstructive sleep apnea (OSA), a highly prevalent and serious disorder with significant complications, causes considerable daytime and nighttime symptoms as well as long-term consequences and is yet an underdiagnosed and inadequately treated condition. Patients with OSA undergo frequent awakenings during the sleep cycle and find it impossible to get restorative sleep. Individuals are extremely fatigued, sleepy, and irritable throughout the day.
View Article and Find Full Text PDFNeurology
January 2025
Department of Neurology, Massachusetts General Hospital, Boston.
Background And Objectives: Rolandic epilepsy (RE), the most common childhood focal epilepsy syndrome, is characterized by a transient period of sleep-activated epileptiform activity in the centrotemporal regions and variable cognitive deficits. Sleep spindles are prominent thalamocortical brain oscillations during sleep that have been mechanistically linked to sleep-dependent memory consolidation in animal models and healthy controls. Sleep spindles are decreased in RE and related sleep-activated epileptic encephalopathies.
View Article and Find Full Text PDFNeurourol Urodyn
January 2025
Department of Surgery, Division of Urology, Virginia Commonwealth University Health System, Richmond, Virginia, USA.
Introduction And Objective: Observable autonomous rhythmic changes in intravesical pressure, termed bladder wall micromotion, is a phenomenon that has been linked to urinary urgency, the key symptom in overactive bladder (OAB). However, the mechanism through which micromotion drives urinary urgency is poorly understood. In addition, micromotion is inherently difficult to study in human urodynamics due to challenges distinguishing it from normal cyclic physiologic processes such as pulse rate, breathing, rectal contractions, and ureteral jetting.
View Article and Find Full Text PDFJ Allergy Clin Immunol
January 2025
Institute of Human Genetics, UMR9002, CNRS and Montpellier University; Montpellier, France; Montpellier University; Montpellier, France; Immunology Department, University Hospital; Nîmes, France. Electronic address:
Background: We have recently shown that, during acute severe COVID-19, SARS-CoV-2 spike protein (S) induces a cascade of events resulting in T cell apoptosis. Indeed, by neutralizing the protease activity of its receptor, ACE2, S induces an increase in circulating Angiotensin II (AngII), resulting in monocytic release of reactive oxygen species (ROS) and programmed T cell death.
Objective: Here, we tested whether SARS-CoV-2 mRNA vaccines, known to cause the circulation of the vaccine antigen, S-protein receptor binding domain (RBD), might trigger the same cascade.
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