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CA1 and CA3 differentially support spontaneous retrieval of episodic contexts within human hippocampal subfields

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Dimsdale-Zucker, Halle R., Ritchey, Maureen, Ekstrom, Arne D., Yonelinas, Andrew P., Ranganath, Charan·2018·Nature Communications

DOI 10.1038/s41467-017-02752-1PMC PMC5773497

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Abstract

The hippocampus plays a critical role in spatial and episodic memory. Mechanistic models predict that hippocampal subfields have computational specializations that differentially support memory. However, there is little empirical evidence suggesting differences between the subfields, particularly in humans. To clarify how hippocampal subfields support human spatial and episodic memory, we developed a virtual reality paradigm where participants passively navigated through houses (spatial contexts) across a series of videos (episodic contexts). We then used multivariate analyses of high-resolution fMRI data to identify neural representations of contextual information during recollection. Multi-voxel pattern similarity analyses revealed that CA1 represented objects that shared an episodic context as more similar than those from different episodic contexts. CA23DG showed the opposite pattern, differentiating between objects encountered in the same episodic context. The complementary characteristics of these subfields explain how we can parse our experiences into cohesive episodes while retaining the specific details that support vivid recollection.

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Fig. 1 Experimental approach. Participants encoded objects uniquely located within one of two spatial locations (spatial contexts) across a series of 20 videos (episodic contexts). Next, they were scanned while performing an object recognition test which required differentiating old and new objects presented without any contextual information. We used representational similarity analyses (RSA) to examine the similarity of voxel patterns elicited by each recollected object relative to other recollected objects that were studied in the same (or different) spatial and episodic context. This figure is not included under the Creative Commons licence for the article; all rights reservedCC BY · PubMed Central

Fig. 2 Pattern similarity in CA1 and CA23DG is sensitive to episodic context. Pattern similarity was higher in left CA1 for items studied in the same video (Same Video Same House) than for items in different videos (Different Video Same House). Left CA23DG showed a reversal of this pattern such that pattern similarity was higher for items studied between videos vs. within the same video. Neither CA1 nor CA23DG patterns were sensitive to spatial context similarity aloneCC BY · PubMed Central

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Authors: Dimsdale-Zucker, H. R., Ritchey, M., Ekstrom, A. D., Yonelinas, A. P., & Ranganath, C.
Affiliations: University of California, Davis (US)
Boston College (US)
Corresponding author: Dimsdale-Zucker, Halle R.
ORCID: Dimsdale-Zucker, Halle R.
Ritchey, Maureen
Ekstrom, Arne D.
Yonelinas, Andrew P.
Venue: Nature Communications
Publisher: Springer Science and Business Media LLC
Published: 2018-01-18
Volume: 9
Issue: 1
Pages: 294-294
ISSN: 2041-1723 (ISSN-L)
DOI: 10.1038/s41467-017-02752-1
PMC: PMC5773497
OpenAlex: W2953335281
Cited by: 205
References: 70
Citations by year: 2026: 20 · 2025: 23 · 2024: 34 · 2023: 24 · 2022: 22 · 2021: 27 · 2020: 19 · 2019: 14 · 2018: 21
FWCI: 12.06
Type: journal article
Language: en
Open access: gold
doi.org
Licence: cc-by
creativecommons.org/licenses/by/4.0 (tdm)
creativecommons.org/licenses/by/4.0 (vor)
Locations: Nature Communications (publishedVersion, cc-by)
bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
Europe PMC (PubMed Central) (publishedVersion, cc-by)
PubMed Central (publishedVersion, cc-by)
PubMed (publishedVersion)
RePEc: Research Papers in Economics (submittedVersion)
DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
eScholarship (California Digital Library) (submittedVersion)
Funders: National Science Foundation (1650042)
University of California, Davis
National Institute of Mental Health (K99MH103401, R00MH103401)
Topics: Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Life Sciences › Neuroscience › Cognitive Neuroscience › Memory Processes and Influences
Social Sciences › Psychology › Experimental and Cognitive Psychology › Spatial Cognition and Navigation
Keywords: hippocampal subfields, CA1, CA3, episodic memory, spatial memory, recollection, contextual memory, virtual reality navigation, multivariate pattern analysis, human hippocampus
MeSH terms: Brain Mapping, Female, Humans, Magnetic Resonance Imaging, Male, Mental Recall, Space Perception, Young Adult, CA1 Region, Hippocampal, CA3 Region, Hippocampal, Memory, Episodic

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CA1 and CA3 differentially support spontaneous retrieval of episodic contexts within human hippocampal subfields

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