Evidence map›Paper›PMID 19706480›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2009

Sparsification of neuronal activity in the visual cortex at eye-opening.

Nathalie L Rochefort, Olga Garaschuk, Ruxandra-Iulia Milos, Madoka Narushima, Nima Marandi, Bruno Pichler, Yury Kovalchuk, Arthur Konnerth

Open access · greenAbstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2009. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 159 papers.

0numbers the graph read from it
0cells of the map it votes in
159citing papers in PubMed
6.6field-weighted citation impact, top 3% 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

159 citing papers in PubMed, 296 citations in OpenAlex.

  1. Review
  2. Article
  3. Article
  4. Article
  5. Article
  6. Investigating hierarchical critical periods in human neurodevelopment.Neuropsychopharmacology : official publication of the American College of Neuropsychopharmacology · 2026
    Review
  7. Article
  8. Article
  9. Connectivity, Computation, and Plasticity of the Early Visual System.The Journal of neuroscience : the official journal of the Society for Neuroscience · 2025
    Review
  10. Article
  11. Article
  12. Interneuron Diversity: How Form Becomes Function.Cold Spring Harbor perspectives in biology · 2025
    Review
  13. Reciprocal interaction between cortical SST and PV interneurons in top-down regulation of retinothalamic refinement.Proceedings of the National Academy of Sciences of the United States of America · 2025
    Article
  14. Review
  15. Article
  16. Article
  17. Article
  18. Review
  19. Article
  20. Activity-Dependent Synapse Refinement: From Mechanisms to Molecules.The Neuroscientist : a review journal bringing neurobiology, neurology and psychiatry · 2024
    Review

99 more citing papers are in PubMed but not listed here.

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

8 authors at 2 institutions in 1 country.

Nathalie L RochefortCenter for Integrated Protein Science and Institute of Neuroscience, Technical University Munich, Biedersteinerstrasse 29, 80802 Munich, Germany.
Olga Garaschuk
Ruxandra-Iulia Milos
Madoka Narushima
Nima Marandi
Bruno Pichler
Yury Kovalchuk
Arthur Konnerth
Center for Integrated Protein Science Munich · DEMax Planck Institute of Neurobiology · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Eye-opening represents a turning point in the function of the visual cortex. Before eye-opening, the visual cortex is largely devoid of sensory inputs and neuronal activities are generated intrinsically. After eye-opening, the cortex starts to integrate visual information. Here we used in vivo two-photon calcium imaging to explore the developmental changes of the mouse visual cortex by analyzing the ongoing spontaneous activity. We found that before eye-opening, the activity of layer 2/3 neurons consists predominantly of slow wave oscillations. These waves were first detected at postnatal day 8 (P8). Their initial very low frequency (0.01 Hz) gradually increased during development to approximately 0.5 Hz in adults. Before eye-opening, a large fraction of neurons (>75%) was active during each wave. One day after eye-opening, this dense mode of recruitment changed to a sparse mode with only 36% of active neurons per wave. This was followed by a progressive decrease during the following weeks, reaching 12% of active neurons per wave in adults. The possible role of visual experience for this process of sparsification was investigated by analyzing dark-reared mice. We found that sparsification also occurred in these mice, but that the switch from a dense to a sparse activity pattern was delayed by 3-4 days as compared with normally-reared mice. These results reveal a modulatory contribution of visual experience during the first days after eye-opening, but an overall dominating role of intrinsic factors. We propose that the transformation in network activity from dense to sparse is a prerequisite for the changed cortical function at eye-opening.

Indexed as

AnimalsCalciumElectrophysiological PhenomenaMiceMice, Inbred BALB CMice, Inbred C57BLNervous System Physiological PhenomenaNeuronsPatch-Clamp TechniquesVision, OcularVisual CortexCalcium

Identifiers

PMID19706480
PMCPMC2736444
OpenAlexW2036168567

What OpenQuestion holds

Textmetadata
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.