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Long-Term Memory (LTM)-- is the final stage of the dual memory model proposed in the Atkinson-Shiffrin memory model, in which information can be stored for long periods of time. While short-term and working memory persist for only about 18 to 30 seconds, information can remain in long-term memory indefinitely. Long-term memory is commonly broken down into explicit memory (declarative), which includes episodic memory, semantic memory, and autobiographical memory, and implicit memory