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I'm currently studying PRIMs within the context of ACT-R by reading these two papers. In the papers, there are references to both declarative and working memory modules of ACT-R. What is the difference between these memory modules? Is the only difference the allowed operations on this memory and thus their use? Are there also decay effects in working memory?

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This article explains the difference :

Declarative memory takes the form of a semantic net linking propositions, images, and sequences by associations.

The nodes of long-term memory all have some degree of activation and working memory is that part of long-term memory that is most highly activated.

ACT-R Model

The declarative memory is all knowledge that can be retrieved in consciousness. Working memory activates only the declarative memory needed for the current task.

When a different task is given, the activation changes to match the needs of the new task. The non-relevant active knowledge is deactivated, and new relevant knowledge is retrieved.

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