Evidence map›Paper›PMID 34464663›Full record

ArticleNeuroscience2021

Voluntary Exercise Increases Neurogenesis and Mediates Forgetting of Complex Paired Associates Memories.

Jonathan R Epp, Leigh C P Botly, Sheena A Josselyn, Paul W Frankland

Open access · greenAbstract read
In one paragraph

Article in Neuroscience, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 17 papers.

0numbers the graph read from it
0cells of the map it votes in
17citing papers in PubMed
2.5field-weighted citation impact, top 12% 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

17 citing papers in PubMed, 24 citations in OpenAlex.

  1. Review
  2. Review
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  4. Memory processing by hippocampal adult-born neurons.Neurobiology of learning and memory · 2025
    Review
  5. Article
  6. Fear of Predators Suppresses Neurogenesis in the Brains of Wild Songbirds.Integrative organismal biology (Oxford, England) · 2025
    Article
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 1 institution in 1 country.

Jonathan R EppProgram in Neurosciences and Mental Health, The Hospital for Sick Children, Toronto M5G 1X8, Canada; Cumming School of Medicine, Hotchkiss Brain Institute, Department of Cell Biology and Anatomy, University of Calgary, Calgary, AB T2N 4N1, Canada. Electronic address: jonathan.epp1@ucalgary.ca.
Leigh C P BotlyProgram in Neurosciences and Mental Health, The Hospital for Sick Children, Toronto M5G 1X8, Canada.
Sheena A JosselynProgram in Neurosciences and Mental Health, The Hospital for Sick Children, Toronto M5G 1X8, Canada; Department of Psychology, University of Toronto, Toronto, Ontario M5S 3GM, Canada; Department of Physiology, University of Toronto, Toronto, Ontario M5S 1A8, Canada; Institute of Medical Science, University of Toronto, Toronto, Ontario M5S 1A8, Canada.
Paul W FranklandProgram in Neurosciences and Mental Health, The Hospital for Sick Children, Toronto M5G 1X8, Canada; Department of Psychology, University of Toronto, Toronto, Ontario M5S 3GM, Canada; Department of Physiology, University of Toronto, Toronto, Ontario M5S 1A8, Canada; Institute of Medical Science, University of Toronto, Toronto, Ontario M5S 1A8, Canada. Electronic address: paul.frankland@sickkids.ca.
Hospital for Sick Children · CA

Funding

The Role of Neuronal Ensembles Supporting Auditory Fear Conditioning (Engrams) in the Amygdala in Memory Formation, Generalization and ExtinctionR01MH119421 · NIMH · HOSPITAL FOR SICK CHLDRN (TORONTO) · PI FRANKLAND, PAUL, JOSSELYN, SHEENA A · 2019 to 2023
$1.7M
CIHR FDN143227CIHR MOP74650NIMH NIH HHS R01 MH119421
6 · The paper itself

Abstract

The hippocampus is a critical structure involved in many forms of learning and memory. It is also one of the only regions in the mammalian brain that continues to generate new neurons throughout adulthood. This process of adult neurogenesis may increase the plasticity of the hippocampus which could be beneficial for learning but has also been demonstrated to decrease the stability of previously acquired memories. Here we test whether exposure to voluntary running (which increases the production of new neurons) following the formation of a gradually acquired paired associates task will result in forgetting of this type of memory. We trained mice in a touchscreen-based object/location task and then increased neurogenesis using voluntary running. Our results indicate that running increased neurogenesis and resulted in poor recall of the previously established memory. When subsequently exposed to a reversal task we also show that running reduced the number of correction trials required to acquire the new task contingencies. This suggests that prior forgetting reduces perseveration on the now outdated memory. Together our results add to a growing body of literature which indicates the important role of adult neurogenesis in destabilizing previously acquired memories to allow for flexible encoding of new memories.

Indexed as

NeurogenesisPhysical Conditioning, AnimalAnimalsHippocampusLearningMiceNeuronsforgettingmemoryneurogenesisrunningtouchscreen

Identifiers

PMID34464663
PMCPMC8682805
OpenAlexW3198007624

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.