Cited by 55Memory and Neural MechanismsMemory Processes and InfluencesCognitive Functions and Memory

Hippocampal-cortical interactions during event boundaries support retention of complex narrative events

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Barnett, Alexander J., Nguyen, Mitchell, Spargo, James, Yadav, Reesha, Cohn-Sheehy, Brendan I., Ranganath, Charan·2024·Neuron

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Abstract

According to most memory theories, encoding involves continuous communication between the hippocampus and neocortex, but recent work has shown that key moments at the end of an event, called event boundaries, may be especially critical for memory formation. We sought to determine how communication between the hippocampus and neocortical regions during the encoding of naturalistic events related to subsequent retrieval of those events and whether this was particularly important at event boundaries. Participants encoded and recalled two cartoon movies during fMRI scanning. Higher functional connectivity between the hippocampus and the posterior medial network (PMN) at an event's offset is related to the subsequent successful recall of that event. Furthermore, hippocampal-PMN offset connectivity also predicted the amount of detail retrieved after a 2-day delay. These data demonstrate that the relationship between memory encoding and hippocampal-neocortical interaction is dynamic and biased toward boundaries.

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  • Recent fMRI work shows that hippocampal-cortical interactions at encoding boundaries promote persistent and detailed memory representations.

    “Recent fMRI work further underscores the importance of 'encoding at boundaries,' showing that hippocampal-cortical interactions at these points promote persistent and detailed memory representations [4].”

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Authors
Barnett, A. J., Nguyen, M., Spargo, J., Yadav, R., Cohn-Sheehy, B. I., & Ranganath, C.
Affiliations
  • University of Toronto (CA)
  • University of California, Davis (US)
Corresponding author
Barnett, Alexander J.
Venue
Neuron
Publisher
Elsevier BV
Published
2024-01
Volume
112
Issue
2
Pages
319-330.e7
ISSN
0896-6273 (ISSN-L)
OpenAlex
W4388500497
Cited by
55
References
137
Citations by year
2026: 15 · 2025: 22 · 2024: 15 · 2023: 3
FWCI
8.22
Type
journal article
Language
en
Open access
Locations
  • Neuron (publishedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • SSRN Electronic Journal (acceptedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institute on Aging
  • U.S. Department of Defense
  • Office of Naval Research Multidisciplinary University Research Initiative (N00014-17-1-2961)
  • Office of Naval Research
  • University of California, Davis
  • Natural Sciences and Engineering Research Council of Canada (F30AG062053)
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 › Cognitive Functions and Memory
Keywords
hippocampal-neocortical interaction, event boundaries, memory encoding, functional connectivity, narrative memory, memory retrieval, long-term memory retention
MeSH terms
Brain Mapping, Communication, Hippocampus, Humans, Magnetic Resonance Imaging, Mental Recall, Neocortex, Memory, Episodic

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