Hippocampus as Construction System (Not Memory Store)
Type: claim Slug: claim—hippocampus-as-construction-system Sources: deconstructing-episodic-memory-with-construction—hassabis, patients-with-hippocampal-amnesia-cannot-imagine-new-experiences—hassabis, the-construction-system-of-the-brain—hassabis Last updated: 2026-05-13
Summary
The hippocampus does not store episodic memories as holistic recordings but instead constructs scene-like representations by recombining stored elements (people, places, objects) from distributed cortical stores. First stated in the 2007 BBS target article, this claim challenges the standard “store and retrieve” model of episodic memory.
Evidence
- Lesion evidence: hippocampal amnesia patients cannot imagine new experiences (paper—patients-with-hippocampal-amnesia-cannot-imagine-new-experiences)
- Architecture: hippocampus + vmPFC + PPC + temporal pole form a construction network (paper—the-construction-system-of-the-brain)
- Neural: single neurons encode recombable concepts (paper—decoding-neuronal-ensembles-in-the-human-hippocampus)
Status
Stated 2007, not substantially revised since 2008. Later papers test predictions but do not modify the core claim. No formal comparison against alternative accounts (e.g., standard consolidation theory) in a single study.
Connections
- Theme: theme—hippocampal-construction, theme—memory-imagination
- Project: project—hippocampus-research
- Period: period—phd-period (origin)
Honest Gaps
- All evidence is correlational (fMRI) or lesion-based — no causal manipulation.
- No animal model work in corpus.
- The claim has never been formally pitted against strong alternative accounts.