From Science Daily:
ScienceDaily (Nov. 13, 2009) — Short-term memory may depend in a surprising way on the ability of newly formed neurons to erase older connections. That’s the conclusion of a report in the November 13th issue of the journal Cell, a Cell Press publication, that provides some of the first evidence in mice and rats that new neurons sprouted in the hippocampus cause the decay of short-term fear memories in that brain region, without an overall memory loss.
The researchers led by Kaoru Inokuchi of The University of Toyama in Japan say the discovery shows a more important role than many would have anticipated for the erasure of memories. They propose that the birth of new neurons promotes the gradual loss of memory traces from the hippocampus as those memories are transferred elsewhere in the brain for permanent storage. Although they examined this process only in the context of fear memory, Inokuchi says he “thinks all memories that are initially stored in the hippocampus are influenced by this process.”
In effect, the new results suggest that failure of neurogenesis will lead to problems because the brain’s short-term memory is literally full. In Inokuchi’s words, we may perhaps experience difficulties in acquiring new information because the storage capacity of the hippocampus is “occupied by un-erased old memories.”
Of course, Inokuchi added, “our finding does not necessary deny the important role of neurogenesis in memory acquisition.” Hippocampal neurogenesis could have a dual role, he says, in both erasing old memories and acquiring new ones.
Earlier studies had shown a crucial role for the hippocampus in memorizing new facts. Studies in people with impaired and normal memories and in animals also showed that information recall initially depends on the hippocampus. That dependence progressively decays over time as memories are transferred to other regions, such as the neocortex. Scientists have also observed a similar decay in the strength of connections between neurons of the hippocampus, a phenomenon known as long-term potentiation (LTP) that is considered the cellular basis for learning and memory.
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