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Memory and Imagination

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Memory and Imagination

Type: theme Slug: theme—memory-imagination Sources: patients-with-hippocampal-amnesia-cannot-imagine-new-experiences—hassabis, deconstructing-episodic-memory-with-construction—hassabis, the-construction-system-of-the-brain—hassabis, the-future-of-memory-remembering-imagining-and-the-brain—hassabis, using-imagination-to-understand-the-neural-basis-of-episodic-memory—hassabis, imagine-all-the-people-how-the-brain-creates-and-uses-personality-models—hassabis Last updated: 2026-05-13

Summary

The memory-imagination theme captures the core finding of the PhD period: that episodic memory and imagination share a common neural substrate in the hippocampus. Six papers (2007–2009) establish this through lesion studies, theoretical frameworks, and behavioural paradigms. The theme is narrower than theme—hippocampal-construction — it focuses specifically on the memory-imagination link rather than the broader construction system architecture.

Core content

The foundational dissociation (2007): Patients with hippocampal amnesia cannot imagine new experiences (paper—patients-with-hippocampal-amnesia-cannot-imagine-new-experiences). This was the first demonstration that damage to a “memory system” also impairs imagination — a finding that could not be explained by standard memory theories.

The theoretical framework (2007): The construction account (paper—deconstructing-episodic-memory-with-construction) explains why memory and imagination share a mechanism: both require assembling scene representations from component elements stored in cortex. The hippocampus is the assembler; whether the scene is from the past (memory) or hypothetical (imagination) is irrelevant to the mechanism.

The review (2009): The future of memory (paper—the-future-of-memory-remembering-imagining-and-the-brain) surveys the emerging memory-imagination literature and positions the construction account within it, arguing that future-oriented thinking (episodic future thinking) is the evolutionary function of the hippocampal system.

Behavioural paradigms (2007–2009): Using imagination to understand memory (paper—using-imagination-to-understand-the-neural-basis-of-episodic-memory) developed paradigms that use imagination tasks as probes for hippocampal function. Imagine all the people (paper—imagine-all-the-people-how-the-brain-creates-and-uses-personality-models—hassabis) showed that the hippocampus constructs personality models — extending the imagination claim to social cognition.

Connections

  • Theme: theme—hippocampal-construction (broader framework), theme—episodic-memory
  • Project: project—hippocampus-research
  • Period: period—phd-period (all papers)
  • Collaborators: Eleanor A. Maguire, Catriona D. Bruce, Dharshan Kumaran, Raymond Dolan

Honest Gaps

  • The memory-imagination link is demonstrated through correlation and lesion — no causal manipulation (e.g., TMS to hippocampus during imagination tasks) is in the corpus.
  • The evolutionary argument (hippocampus evolved for future thinking) is speculative and not empirically tested in these papers.
  • No individual differences are examined — why can some people imagine more vividly than others?

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