<P> Long - term memory (LTM) is the stage of the Atkinson--Shiffrin memory model where informative knowledge is held indefinitely . It is defined in contrast to short - term and working memory, which persist for only about 18 to 30 seconds . Long - term memory is commonly labelled as explicit memory (declarative), as well as episodic memory, semantic memory, autobiographical memory, and implicit memory (procedural memory). </P> <P> According to Miller, whose paper in 1956 popularized the theory of the "magic number seven", short - term memory is limited to a certain number of chunks of information, while long - term memory has a limitless store . </P> <P> According to the dual store memory model proposed by Richard C. Atkinson and Richard Shiffrin in 1968, memories can reside in the short - term "buffer" for a limited time while they are simultaneously strengthening their associations in long - term memory . When items are first presented, they enter short - term memory, but due to its limited space, as new items enter, older ones are pushed out . However, each time an item in short - term memory is rehearsed, it is strengthened in long - term memory . Similarly, the longer an item stays in short - term memory, the stronger its association becomes in long - term memory . </P>

Explain how the process of construction is often involved in long-term memory storage