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Interestingly, such a disruption does not impair memory for facts and events that have already been consolidated.Thus, an amnesiac with hippocampal damage would not be able to learn the names of current presidential candidates but would be able to recall the identity of our 16th president (Abraham Lincoln, of course! The role of sleep in memory consolidation is an ancient question dating back to the Roman rhetorician Quintilian in the first century A. Much research in the past decade has been dedicated to better understanding the interaction between sleep and memory. At the molecular level, gene expression responsible for protein synthesis is increased during sleep in rats exposed to enriched environments, suggesting memory consolidation processes are enhanced, or may essentially rely, on sleep.Further, patterns of activity observed in rats during spatial learning are replayed in hippocampal neurons during subsequent sleep, further suggesting that learning may continue in sleep.In humans, recent studies have demonstrated the benefits of sleep on declarative memory performance, thus giving a neurological basis to the old adage, "sleep on it." A night of sleep reportedly enhances memory for associations between word pairs.Inhibiting protein synthesis, however, does abolish the formation of new long-term representations of space in hippocampal neurons, thus impairing the consolidation of spatial memories.Over time, the brain systems that support individual, declarative memories also change as a result of systems-level consolidation processes.The hypothesis that new memories consolidate slowly over time was proposed 100 years ago, and continues to guide memory research.

Alternately, existing synapses can be strengthened to allow for increased sensitivity in the communication between two neurons.

This type of memory relies on the function of a brain region called the hippocampus and other surrounding medial temporal lobe structures.

At the cellular level, memory is expressed as changes to the structure and function of neurons.

Researchers found that the changes to a cell that occurred in response to an initial stimulation lasted some three to five minutes and disappeared within five to 10 minutes.

If the cell was stimulated four times over the course of an hour, however, the synapse would actually split and new synapses would form, producing a (presumably) permanent change.

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