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Neuronal oscillations are important components of neuroscience research. During the last two decades, hippocampal oscillations have been a major focus in the research of neuronal oscillations. [3] Among different oscillations present in the brain, SWRs are the first population activity that start in the developing hippocampus. [4]
Later, hippocampal oscillations of the same type were observed in rats; however, the frequency of rat hippocampal EEG oscillations averaged about 8 Hz and rarely fell below 6 Hz. Thus the rat hippocampal EEG oscillation should not, strictly speaking, have been called a "theta rhythm". However the term "theta" had already become so strongly ...
Autocorrelations and spike raster plots of two single-units recorded from the secondary somatosensory cortex of a monkey. The top neuron is oscillating spontaneously at approximately 30 Hz. The bottom neuron is not oscillating. [2] Neural oscillations, or brainwaves, are rhythmic or repetitive patterns of neural activity in the central nervous ...
This has meant the study of hippocampal activity has been largely restricted to that of the rat and less often the mouse. [2] Theta rhythm with its low frequency of around 6–7 Hz in a steady oscillation has been observed in rats that are motionless but alert. This extends to that sleeping cycle characterised by rapid eye movement (REM).
Phase precession in the entorhinal cortex has been hypothesized to arise from an attractor network process, so that two sequential neural representations within a single cycle of the theta oscillation can be temporally linked to each other downstream in the hippocampus, as episodic memories. [13]
The entorhinal cortex (EC) is a structure in the brain located in the medial temporal lobe.The EC is composed of six distinct layers. The superficial (outer) layers, which include layers I through III, are mainly input layers that receive signals from other parts of the EC, but also project to hippocampal structures via the perforant path.
The hippocampus (pl.: hippocampi; via Latin from Greek ἱππόκαμπος, 'seahorse'), also hippocampus proper, is a major component of the brain of humans and many other vertebrates. In the human brain the hippocampus, the dentate gyrus, and the subiculum are the components of the hippocampal formation located in the limbic system.
The hippocampus is a region of the forebrain in the medial temporal lobe closely associated with memory formation and recollection. Gamma and theta oscillations, released during exploratory activities, create modulated rhythms that transform into prolonged excitation, and furthermore into memories or improper potentiation. [4]