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There is an interface between priming memory and working memory that acts to limit the amount of data in working memory, and also allows priming memory to be actively maintained so that memories stay intact while they are in working memory. This interface converts from functional clusters to chunks automatically as part of the transfer from priming to working memory. As a result, memories in working memory can be rehearsed in order to actively maintain them. This represents more than a change in state, it represents a radical change in the way memories are accessed. Priming memory without this stage can only be extended it cannot be refreshed and so there is a limit of about 3 seconds to how long it will last before it begins to degrade. With priming, an actively maintained and refreshed signal can last almost indefinitely.