Memory
Recent studies also support the possibility of a critical period for the development of neurons that mediate memory processing. Experimental evidence supports that notion that young neurons in the adult dentate gyrus have a critical period (about 1–3 weeks after neuronal birth) during which time they are integral to memory formation. Although the exact reasoning behind this observation is indefinite, studies suggest that the functional properties of neurons at this age make them most appropriate for this purpose; these neurons : (1) Remain hyperactive during the formation of memories; (2) are more excitable; and (3) More easily depolarizable due to GABAergic effects. It is also possible that hyperplasticity makes there neurons more useful in memory formation; if these young neurons had more plasticity than adult neurons in the same context, they would be able to be more influential in smaller numbers. The role of these neurons in the adult dentate gyrus in memory processing is further supported by the fact that behavioral experiments have shown that an intact dentate gyrus is integral to hippocampal memory formation. It is speculated that the dentate gyrus acts a relay station for information relating to memory storage. The likelihood of a critical period could change the way we view memory processing because it would ultimately mean that the collection of neurons present is constantly being replenished as new neurons replace old ones. If a critical period does indeed exist this could possibly mean that: (1) Diverse populations of neurons that represent events occurring soon after one another may connect those event temporally in the memory formation and processing; OR (2) These different populations of neurons may distinguish between similar events, independent of temporal position; OR (3) Separate populations may mediate the formation of new memories when the same events occur frequently.
Read more about this topic: Critical Period
Famous quotes containing the word memory:
“And year by year our memory fades
From all the circle of the hills.”
—Alfred Tennyson (1809–1892)
“Language was not powerful enough to describe the infant phenomenon. “I’ll tell you what, sir,” he said; “the talent of this child is not to be imagined. She must be seen, sir—seen—to be ever so faintly appreciated.”... The infant phenomenon, though of short stature, had a comparatively aged countenance, and had moreover been precisely the same age—not perhaps to the full extent of the memory of the oldest inhabitant, but certainly for five good years.”
—Charles Dickens (1812–1870)
“Near this spot are deposited the remains of one who possessed Beauty without Vanity, Strength without Insolence, Courage without Ferocity, and all the Virtues of Man without his Vices. This praise, which would be unmeaning Flattery, if inscribed over human ashes, is but a just Tribute to the Memory of BOATSWAIN, a Dog.”
—John Cam Hobhouse (1786–1869)