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Cohn-Sheehy BI, Delarazan AI, Reagh ZM, Crivelli-Decker JE, Kim K, Barnett AJ, Zacks JM, Ranganath C. The hippocampus constructs narrative memories across distant events. Curr Biol 2021; 31:4935-4945.e7. [PMID: 34592172 PMCID: PMC9373723 DOI: 10.1016/j.cub.2021.09.013] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Revised: 07/26/2021] [Accepted: 09/06/2021] [Indexed: 11/28/2022]
Abstract
Life's events are scattered throughout time, yet we often recall different events in the context of an integrated narrative. Prior research suggests that the hippocampus, which supports memory for past events, can support the integration of overlapping associations or separate events in memory. However, the conditions that lead to hippocampus-dependent memory integration are unclear. We used functional brain imaging to test whether the opportunity to form a larger narrative (narrative coherence) drives hippocampal memory integration. During encoding of fictional stories, patterns of hippocampal activity, including activity at boundaries between events, were more similar between distant events that formed one coherent narrative, compared with overlapping events taken from unrelated narratives. One day later, the hippocampus preferentially supported detailed recall of coherent narrative events, through reinstatement of hippocampal activity patterns from encoding. These findings demonstrate a key function of the hippocampus: the integration of events into a narrative structure for memory.
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Affiliation(s)
- Brendan I. Cohn-Sheehy
- M.D./Ph.D. Program, University of California, Davis, Sacramento, CA, USA,Neuroscience Graduate Group, University of California, Davis, Davis, CA, USA,Center for Neuroscience, University of California, Davis, Davis, CA, USA,Corresponding Author and Lead Contact: Brendan I. Cohn-Sheehy, Ph.D.
| | - Angelique I. Delarazan
- Department of Psychological and Brain Sciences, Washington University, 1 Brookings Drive, St. Louis, MO, USA
| | - Zachariah M. Reagh
- Department of Psychological and Brain Sciences, Washington University, 1 Brookings Drive, St. Louis, MO, USA
| | - Jordan E. Crivelli-Decker
- Center for Neuroscience, University of California, Davis, Davis, CA, USA,Department of Psychology, University of California, Davis, Davis, CA, USA
| | - Kamin Kim
- Center for Neuroscience, University of California, Davis, Davis, CA, USA
| | | | - Jeffrey M. Zacks
- Department of Psychological and Brain Sciences, Washington University, 1 Brookings Drive, St. Louis, MO, USA
| | - Charan Ranganath
- Neuroscience Graduate Group, University of California, Davis, Davis, CA, USA,Center for Neuroscience, University of California, Davis, Davis, CA, USA,Department of Psychology, University of California, Davis, Davis, CA, USA
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