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Related Experiment Video

Updated: Mar 8, 2026

Monocular Visual Deprivation and Ocular Dominance Plasticity Measurement in the Mouse Primary Visual Cortex
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Enhancement of visual cortex plasticity by dark exposure.

Irina Erchova1, Asta Vasalauskaite1, Valentina Longo1

  • 1School of Biosciences and Neuroscience and Mental Health Research Institute, Cardiff University, Sir Martin Evans Building, Museum Avenue, Cardiff, CF10 3AX, UK.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|January 18, 2017
PubMed
Summary

A week of dark exposure (DE) in mice modestly enhanced visual cortex plasticity, slightly speeding recovery from monocular deprivation (MD). However, long-term recovery levels and neuronal selectivity remained similar between groups.

Keywords:
imagingmouseocular dominanceparvalbuminplasticityvisual cortex

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Area of Science:

  • Neuroscience
  • Visual System Plasticity
  • Developmental Neuroscience

Background:

  • Dark rearing delays critical period plasticity in the visual cortex.
  • Dark exposure (DE) may enhance or reinstate plasticity by altering excitatory-inhibitory balance or removing structural brakes.

Purpose of the Study:

  • Investigate DE effects on recovery from monocular deprivation (MD) in juvenile mouse V1.
  • Assess DE's impact on ocular dominance and neuronal selectivity recovery.

Main Methods:

  • Optical imaging of intrinsic signals to measure ocular dominance.
  • Two-photon calcium imaging to assess orientation selectivity of excitatory neurons.
  • Analysis of parvalbumin-positive (PV+) interneuron plasticity and perineuronal net association.

Main Results:

  • DE mice showed slightly faster ocular dominance recovery post-MD, but overall recovery levels were similar after three weeks.
  • No significant difference in orientation selectivity recovery for excitatory neurons between DE and non-DE groups.
  • PV+ interneurons showed less ocular dominance shift during MD, with no recovery differences. DE reduced perineuronal nets around PV+ cells.

Conclusions:

  • Dark exposure provides a modest enhancement of visual cortex plasticity in mice.
  • DE may facilitate plasticity by reducing structural constraints like perineuronal nets.
  • Further research is needed to fully understand the mechanisms and long-term effects of DE on visual plasticity.