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In learning, the brain forgets things on purpose

Scientists have known that newly acquired, short-term memories are often fleeting. But a new study in flies suggests that kind of forgetfulness doesn't just happen. Rather, an active process of erasing memories may in some ways be as important as the ability to lay down new memories, say researchers who report their findings in the February 19th issue of the journal Cell.

At the psychological level, scientists have debated about the reasons we forget. One theory held that new memories are simply unstable and evaporate over time. On the other hand, some thought that interference caused earlier short-term memories to be overridden as new information comes in.

Now it appears that those competing notions are, at the molecular level at least, one and the same.

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