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Hippocampal replay is a phenomenon observed in rats, mice, [1] cats, rabbits, [2] songbirds [3] and monkeys. [4] During sleep or awake rest, replay refers to the re-occurrence of a sequence of cell activations that also occurred during activity, but the replay has a much faster time scale.
Prioritizing sleep Suzuki gets a solid eight hours of sleep per night, and wakes up at the same time every day. “I like to wake up early, between 5 and 5:30 a.m.,” she says.
These fast ripples are field potentials of hypersynchronous bursting of excitatory neurons pyramidal cells at frequencies between 250 and 600 Hz. [16] Fast ripples in the hippocampus are considered as pathologic patterns directly associated with epilepsy, but they appear during both physiological and pathological states in neocortex. [17]
The hippocampus is located in the medial temporal lobe (subcortical), and is an infolding of the medial temporal cortex. [1] The hippocampus plays an important role in the transfer of information from short-term memory to long-term memory during encoding and retrieval stages. These stages do not need to occur successively, but are, as studies ...
However, an excess of cortisol can impair the ability of the hippocampus to both encode and recall memories. [2] These stress hormones are also hindering the hippocampus from receiving enough energy by diverting glucose levels to surrounding muscles. [2] Stress affects many memory functions and cognitive functioning of the brain. [10]
The sample of mouse EEG. Theta rhythm is prominent during part of awaking and REM sleep. Due to the density of its neural layers, the hippocampus generates some of the largest EEG signals of any brain structure. In some situations the EEG is dominated by regular waves at 4–10 Hz, often continuing for many seconds.