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The hippocampal theta rhythm is a strong oscillation that can be observed in the hippocampus and other brain structures in numerous species of mammals including rodents, rabbits, dogs, cats, and marsupials. "Cortical theta rhythms" are low-frequency components of scalp EEG, usually
Neural oscillations, in particular theta activity, are extensively linked to memory function. Theta rhythms are very strong in rodent hippocampi and entorhinal cortex during learning and memory retrieval, and they are believed to be vital to the induction of long-term potentiation, a potential cellular mechanism for learning and memory.
The local field potential theta rhythm is shown at the bottom in black. The action potentials of each cell occur earlier and earlier with respect to the theta peak on each successive cycle – this is phase precession. One consequence of this is that within a single theta cycle (blue-shaded rectangle, for example) the cells fire in the same ...
Sensorimotor rhythm aka mu rhythm In addition to the posterior basic rhythm, there are other normal alpha rhythms such as the mu rhythm (alpha activity in the contralateral sensory and motor cortical areas) that emerges when the hands and arms are idle; and the "third rhythm" (alpha activity in the temporal or frontal lobes).
[3] [4] An extra-hippocampal structure, the septum, initiates and regulates the theta rhythm and its associated memory processes. GABAergic activity within the septum inhibits certain classes of CA3 cells (a region of the hippocampus), the divide often drawn between basket cells, pyramidal cells, and interneurons, to distinguish encoding from ...
Dynamics of the theta model on the unit circle. Blue denotes a stable fixed point; Green denotes an unstable fixed point. By varying the input parameter, the two equilibria collide and form a stable limit cycle; Gray arrows indicate that the points are attracting in ; Black arrows indicate the direction of movement along the unit circle.
Scientists Discovered Mysterious Musical Rhythms in Space—and Found the Secret Culprit. Jackie Appel. July 16, 2024 at 6:00 AM. Puffy Planets Are Prima Ballerinas cemagraphics - Getty Images.
Buzsáki's primary interests is "neural syntax", i.e., how segmentation of neural information is organized by the numerous brain rhythms to support cognitive functions.He identified the cellular-synaptic basis of hippocampal theta, gamma oscillations and sharp waves with associated fast oscillations, their relationship to each other and to behavior and sleep.