Hippocampal replay is not a simple function of experience
Open accessAbstract
Replay of behavioral sequences in the hippocampus during sharp wave ripple complexes (SWRs) provides a potential mechanism for memory consolidation and the learning of knowledge structures. Current hypotheses imply that replay should straightforwardly reflect recent experience. However, we find these hypotheses to be incompatible with the content of replay on a task with two distinct behavioral sequences (A and B). We observed forward and backward replay of B even when rats had been performing A for >10 min. Furthermore, replay of nonlocal sequence B occurred more often when B was infrequently experienced. Neither forward nor backward sequences preferentially represented highly experienced trajectories within a session. Additionally, we observed the construction of never-experienced novel-path sequences. These observations challenge the idea that sequence activation during SWRs is a simple replay of recent experience. Instead, replay reflected all physically available trajectories within the environment, suggesting a potential role in active learning and maintenance of the cognitive map.
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The OBH can account for many statistical 'replay' results since those neurons that saw synaptic changes in response learning are most affected by the regularization of dreaming, and since exact sequence replication is rare and most 'replay' is actually never-before-seen firing patterns.
“In this way the OBH can account for many of the statistical “replay” results since those neurons that saw synaptic changes in response learning are most affected by the regularization of dreaming, and since exact sequence replication is rare and most “replay” is actually never-before-seen firing patterns.69”
From The overfitted brain: Dreams evolved to assist generalization (2021) · cites this paper as [69]
Split into 2 atoms — 0 confirmed, 1 partially supported, 1 disputed, 0 misattributed, 0 unverifiable. Expand the claim to see per-atom verdicts.
Checked by a reasoning model — may be wrong.
Experimental — accuracy not yet measuredReplay results more often contain never-before-seen patterns of activity than actual replays of waking sequences.
“the OBH fits with the fact that “replay” results more often contain never-before-seen patterns of activity than actual replays of waking sequences,69”
From The overfitted brain: Dreams evolved to assist generalization (2021) · cites this paper as [69]
The Discussion says never-experienced sequences occurred but were rare, contrary to the claim that they occur more often than replays of experienced sequences. The Results section on never-experienced shortcut sequences reports 19 shortcut sequences; the Results section on forward and backward replay reports 1,719 replays overall. The paper does not support the claimed frequency comparison. (LLM, conf=0.90)
Checked by a reasoning model — may be wrong.
Experimental — accuracy not yet measuredWell-controlled neuroimaging experiments show little evidence for exact sequence replication and strong evidence for mostly never-before-seen firing patterns.
“Furthermore, the hypothesis must grapple with the fact that well-controlled neuroimaging experiments show little evidence for exact sequence replication and strong evidence for mostly never-before-seen firing patterns.69”
From The overfitted brain: Dreams evolved to assist generalization (2021) · cites this paper as [69]
The Results ('Never-experienced shortcut sequences'; page unavailable) provide strong evidence for novel replay trajectories, and the Results ('Comparison of data with current proposed mechanisms') find that replay does not simply reflect recent experience. But the Discussion explicitly calls the novel sequences rare, not 'mostly' never-before-seen. The Experimental Procedures describe analysis of rat place-cell spikes rather than neuroimaging experiments. (LLM, conf=0.90)
Experimental — accuracy not yet measuredIn a task requiring the rat to run back and forth on the same elevated linear track, replay in the reverse order occurred mainly at the end of a run, whereas replay in a forward direction transpired in the anticipatory period before a new run.
“In a task requiring the rat to run back and forth on the same elevated linear track, replay in the reverse order occurred mainly at the end of a run, whereas replay in a forward direction transpired in the anticipatory period before a new run (288, 492).”
From About Sleep's Role in Memory (2013) · cites this paper as [492]
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Memory consolidation as an adaptive process
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Reward revaluation biases hippocampal replay content away from the preferred outcome
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Self-citationDreaming and offline memory consolidation
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“Additionally, the OBH explains why "replay" results more often contain never-before-see patterns of activity than actual replays of waking sequences (Gupta et al., 2010).”
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- Authors
- Gupta, A. S., van der Meer, M. A. A., Touretzky, D. S., & Redish, A. D.
- Affiliations
- Center for the Neural Basis of Cognition (US)
- University of Minnesota (US)
- Corresponding author
- Gupta, Anoopum S.
- Redish, A. David
- Venue
- Neuron
- Publisher
- Elsevier BV
- Published
- 2010-03
- Volume
- 65
- Issue
- 5
- Pages
- 695-705
- ISSN
- 0896-6273 (ISSN-L)
- PMC
- PMC4460981
- OpenAlex
- W2001257668
- Cited by
- 733
- References
- 62
- Citations by year
- 2026: 34 · 2025: 50 · 2024: 51 · 2023: 47 · 2022: 66 · 2021: 49 · 2020: 52 · 2019: 54 · 2018: 47 · 2017: 52 · 2016: 40 · 2015: 42 · 2014: 41 · 2013: 48 · 2012: 31
- FWCI
- 20.70
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- www.elsevier.com/tdm/userlicense/1.0/ (tdm)
- www.elsevier.com/legal/tdmrep-license (tdm)
- www.elsevier.com/open-access/userlicense/1.0/ (vor, 1270 d)
- doi.org/10.15223/policy-017 (stm-asf)
- doi.org/10.15223/policy-037 (stm-asf)
- doi.org/10.15223/policy-012 (stm-asf)
- doi.org/10.15223/policy-029 (stm-asf)
- doi.org/10.15223/policy-004 (stm-asf)
- Locations
- Neuron (publishedVersion)
- PubMed (publishedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Science Foundation (IGERT DGE-0549352)
- National Institutes of Health (R01 MH-080381)
- Pennsylvania Department of Health
- Topics
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Cognitive Neuroscience › Sleep and Wakefulness Research
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory Processes and Influences
- Keywords
- hippocampal replay, sharp-wave ripples, memory consolidation, cognitive maps, active learning
- MeSH terms
- Action Potentials, Animals, Behavior, Animal, Decision Making, Hippocampus, Male, Memory, Models, Neurological, Neurons, Spatial Behavior, Maze Learning, Rats
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