Cited by 716Neuroscience and Neuropharmacology ResearchVisual perception and processing mechanismsNeurogenesis and neuroplasticity mechanisms

Inhibitory threshold for critical-period activation in primary visual cortex

Fagiolini, Michela, Hensch, Takao K.·2000·Nature

Abstract

Neuronal circuits across several systems display remarkable plasticity to sensory input during postnatal development. Experience-dependent refinements are often restricted to well-defined critical periods in early life, but how these are established remains mostly unknown. A representative example is the loss of responsiveness in neocortex to an eye deprived of vision. Here we show that the potential for plasticity is retained throughout life until an inhibitory threshold is attained. In mice of all ages lacking an isoform of GABA (gamma-aminobutyric acid) synthetic enzyme (GAD65), as well as in immature wild-type animals before the onset of their natural critical period, benzodiazepines selectively reduced a prolonged discharge phenotype to unmask plasticity. Enhancing GABA-mediated transmission early in life rendered mutant animals insensitive to monocular deprivation as adults, similar to normal wild-type mice. Short-term presynaptic dynamics reflected a synaptic reorganization in GAD65 knockout mice after chronic diazepam treatment. A threshold level of inhibition within the visual cortex may thus trigger, once in life, an experience-dependent critical period for circuit consolidation, which may otherwise lie dormant.

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Crossref · 10.1038/35004582

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  • A precocious increase of GABA transmission in V1 and precocious maturation of PV cells trigger an earlier onset of the critical period, whereas an accelerated rise of PNNs results in earlier closure.

    “A precocious increase of GABA transmission in V1 and precocious maturation of PV cells trigger an earlier onset (18,41), whereas an accelerated rise of PNNs results in an earlier closure of the critical period (27).”
  • Disruption of excitatory-inhibitory balance shifts the timing and quality of critical period development in primary visual cortex.

    “Accordingly, disruption of E-I balance powerfully shifts the timing and quality of critical period development, as seen in the primary visual cortex (V1) (27–29).”
  • In transgenic mice with disrupted GABA synthesis at synaptic terminals, the critical period for MD sensitivity fails to open unless GABA agonists are applied.

    “In transgenic mice with disrupted GABA synthesis at synaptic terminals, the critical period for MD sensitivity fails to open unless GABA agonists are applied (308, 482).”

    From Hippocampal GABAergic Inhibitory Interneurons (2017) · cites this paper as [308]

  • Maturation of inhibitory circuits, in particular mediated by PVBCs, is necessary for the expression of early competitive plasticity.

    “the maturation of inhibitory circuits, in particular mediated by PVBCs, is necessary for the expression of this early competitive plasticity”

    From Hippocampal GABAergic Inhibitory Interneurons (2017) · cites this paper as [308]

  • Postnatal maturation of cortical inhibitory networks is needed to start the critical period.

    “The maturation of cortical inhibitory networks in the postnatal brain is important for initiating this critical period (Fagiolini and Hensch, 2000; Sugiyama et al., 2008).”

    From Clock Genes Control Cortical Critical Period Timing (2015) · cites this paper as Fagiolini and Hensch, 2000

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Authors
Fagiolini, M., & Hensch, T. K.
Affiliations
  • RIKEN (JP)
  • RIKEN Center for Brain Science (JP)
Corresponding author
Hensch, Takao K.
Venue
Nature
Published
2000-03
Volume
404
Issue
6774
Pages
183-186
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W1994124070
Cited by
716
References
30
Citations by year
2026: 22 · 2025: 37 · 2024: 30 · 2023: 30 · 2022: 25 · 2021: 29 · 2020: 33 · 2019: 29 · 2018: 31 · 2017: 26 · 2016: 26 · 2015: 37 · 2014: 38 · 2013: 42 · 2012: 36
FWCI
7.87
Type
journal article
Language
en
Open access
closed
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
National Science Foundation
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Visual perception and processing mechanisms
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
Keywords
critical period, primary visual cortex, monocular deprivation, GABA synthesis, benzodiazepines, diazepam, synaptic plasticity, experience-dependent plasticity, GABAergic inhibition
MeSH terms
Aging, Animals, Haplorhini, Critical Period, Psychological, Diazepam, gamma-Aminobutyric Acid, Mice, Inbred C57BL, Neuronal Plasticity, Sensory Deprivation, Visual Cortex, Visual Perception, Mice, Knockout, Mice

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