Declarative Memory

Declarative memory is the explicit, consciously accessible memory system that stores facts (semantic memory) and personal experiences (episodic memory). Unlike procedural memory, which operates below the threshold of awareness, declarative memory is reportable: the subject knows that they know, and can articulate what they know. This accessibility comes at a cost — declarative memory is slower to form, more vulnerable to interference, and depends critically on the hippocampus and medial temporal lobe for consolidation. The famous amnesic patient H.M., whose hippocampus was bilaterally resected, could not form new declarative memories while retaining procedural memory intact — a dissociation that remains the strongest evidence for a genuine architectural division between explicit and implicit memory systems.