News tagged with hippocampus

Related topics: brain · memory · neurons · brain regions · brain structure

When memories age

To the brain, it makes a great difference whether we remember experiences from long ago, or if we recollect recent events. RUB neuroscientists have shown that distinct brain networks are involved.

Mar 15, 2016
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How obesity makes memory go bad

University of Alabama at Birmingham researchers are probing how obesity makes memory goes bad, and the underlying molecular mechanism that drives this decline.

Jan 29, 2016
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Stress inhibits spatial perception

Neuroscientists of Collaborative Research Centre 874 at the Ruhr University Bochum have investigated the effects of stress on the perception of scenes and faces. In a behavioural study, they compared the results of stressed ...

Jan 28, 2016
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The hippocampus is a major component of the brains of humans and other mammals. It belongs to the limbic system and plays important roles in long-term memory and spatial navigation. Like the cerebral cortex, with which it is closely associated, it is a paired structure, with mirror-image halves in the left and right sides of the brain. In humans and other primates, the hippocampus is located inside the medial temporal lobe, beneath the cortical surface. Its curved shape reminded early anatomists of the horns of a ram (Cornu Ammonis), or a seahorse. The name, in fact, was taken by the sixteenth century anatomist Julius Caesar Aranzi from the Greek word for seahorse (Greek: ιππος, hippos = horse, καμπος, kampos = sea monster).

In Alzheimer's disease the hippocampus is one of the first regions of the brain to suffer damage; memory problems and disorientation appear among the first symptoms. Damage to the hippocampus can also result from oxygen starvation (hypoxia), encephalitis, or medial temporal lobe epilepsy. People with extensive hippocampal damage may experience amnesia—the inability to form or retain new memories.

In rodents, the hippocampus has been studied extensively as part of the brain system responsible for spatial memory and navigation. Many neurons in the rat and mouse hippocampus respond as place cells: that is, they fire bursts of action potentials when the animal passes through a specific part of its environment. Hippocampal place cells interact extensively with head direction cells, whose activity acts as an inertial compass, and with grid cells in the neighboring entorhinal cortex.

Because of its densely packed layers of neurons, the hippocampus has frequently been used as a model system for studying neurophysiology. The form of neural plasticity known as long-term potentiation (LTP) was first discovered to occur in the hippocampus and has often been studied in this structure. LTP is widely believed to be one of the main neural mechanisms by which memory is stored in the brain.

This text uses material from Wikipedia, licensed under CC BY-SA

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