Evidence map›Paper›PMID 34297916›Full record

ArticleNeuron2021

Hippocampal ripples and their coordinated dialogue with the default mode network during recent and remote recollection.

Yitzhak Norman, Omri Raccah, Su Liu, Josef Parvizi, Rafael Malach

Open access · greenAbstract read
In one paragraph

Article in Neuron, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 59 papers.

0numbers the graph read from it
0cells of the map it votes in
59citing papers in PubMed
11.8field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

59 citing papers in PubMed, 150 citations in OpenAlex.

  1. Article
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  3. Arousal state modulates human hippocampal ripples.bioRxiv : the preprint server for biology · 2026
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  10. Prefrontal Default Mode Network Interactions with Posterior Hippocampus during Exploration.The Journal of neuroscience : the official journal of the Society for Neuroscience · 2025
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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

5 authors at 2 institutions in 2 countries.

Yitzhak NormanDepartment of Neurobiology, Weizmann Institute of Science, Rehovot 76100, Israel. Electronic address: itzik.norman@gmail.com.
Omri RaccahLaboratory of Behavioral and Cognitive Neuroscience, Stanford Human Intracranial Cognitive Electrophysiology Program, Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA 94305, USA.
Su LiuLaboratory of Behavioral and Cognitive Neuroscience, Stanford Human Intracranial Cognitive Electrophysiology Program, Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA 94305, USA.
Josef ParviziLaboratory of Behavioral and Cognitive Neuroscience, Stanford Human Intracranial Cognitive Electrophysiology Program, Department of Neurology and Neurological Sciences, Stanford University, Stanford, CA 94305, USA.
Rafael MalachDepartment of Neurobiology, Weizmann Institute of Science, Rehovot 76100, Israel. Electronic address: rafi.malach@gmail.com.
Cognitive Research (United States) · USWeizmann Institute of Science · IL

Funding

Experimental Study of Goal-Directed Behavior and Memory During Temporal Lobe Epileptic ActivityR21NS113024 · NINDS · STANFORD UNIVERSITY · PI PARVIZI, JOSEF · 2021 to 2022
$433k
NINDS NIH HHS R21 NS113024
6 · The paper itself

Abstract

Hippocampal ripples are prominent synchronization events generated by hippocampal neuronal assemblies. To date, ripples have been primarily associated with navigational memory in rodents and short-term episodic recollections in humans. Here, we uncover different profiles of ripple activity in the human hippocampus during the retrieval of recent and remote autobiographical events and semantic facts. We found that the ripple rate increased significantly before reported recall compared to control conditions. Patterns of ripple activity across multiple hippocampal sites demonstrated remarkable specificity for memory type. Intriguingly, these ripple patterns revealed a semantization dimension, in which patterns associated with autobiographical contents become similar to those of semantic memory as a function of memory age. Finally, widely distributed sites across the neocortex exhibited ripple-coupled activations during recollection, with the strongest activation found within the default mode network. Our results thus reveal a key role for hippocampal ripples in orchestrating hippocampal-cortical communication across large-scale networks involved in conscious recollection.

Indexed as

Brain WavesMemory, EpisodicAdultFemaleHippocampusHumansMaleMental RecallNeocortexSemanticsautobiographical memorydefault mode networkepisodic memoryhippocampusintracranial EEGrecallretrievalsemantic memorysharp wave ripples

Identifiers

PMID34297916
PMCPMC8693710
OpenAlexW3184798017

What OpenQuestion holds

Textmetadata
LicenceTDM
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.