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Space, time and episodic memory: the hippocampus & cognitive map

Space, time and episodic memory: the hippocampus & cognitive map

The following title is included in the latest posted papers focussing on navigation and orientation.

Summaries of all papers have been circulated to members of the Animal Navigation Forum and full papers are available in the ANG Resources directory at the link below (available to non-members).

Ekstrom, A. D. & Ranganath, C. 2017 Space, time, and episodic memory: The hippocampus is all over the cognitive map. Hippocampus, n/a-n/a. doi: 10.1002/hipo.22750. Ekstrom2 2017

In recent years, the field has reached an impasse between models suggesting that the hippocampus is fundamentally involved in spatial processing and models suggesting that the hippocampus automatically encodes all dimensions of experience in the service of memory. Here, we consider key conceptual issues that have impeded progress in our understanding of hippocampal function, and we review findings that establish the scope and limits of hippocampal involvement in navigation and memory. We argue that space and time serve as a primary scaffold to break up experiences into specific contexts, and to organize multimodal input that is to be associated within a context. However, the hippocampus is clearly capable of incorporating additional dimensions into the scaffold if they are determined to be relevant in the event-defined context. Conceiving of the hippocampal representation as constrained by immediate task demands—yet preferring axes that involve space and time—helps to reconcile an otherwise disparate set of findings on the core function of the hippocampus.

  • 21 July 2017
  • Animal Navigation Group

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