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Related Experiment Video

Updated: May 22, 2025

Mapping Inhibitory Neuronal Circuits by Laser Scanning Photostimulation
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Inhibitory specificity from a connectomic census of mouse visual cortex.

Casey M Schneider-Mizell1, Agnes L Bodor2, Derrick Brittain2

  • 1Allen Institute for Brain Science, Seattle, WA, USA. caseys@alleninstitute.org.

Nature
|April 9, 2025
PubMed
Summary

Researchers mapped inhibitory neuron connections in the mouse visual cortex using electron microscopy. They discovered new principles of cortical inhibition, revealing how different inhibitory neuron types target specific excitatory neurons and organize into functional groups.

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Systems Neuroscience

Background:

  • Mammalian cortex contains diverse neuronal cell types with unique properties.
  • Understanding synaptic connectivity is crucial for deciphering cortical circuit function.
  • Mapping connectivity at the resolution of specific cell types remains a challenge.

Purpose of the Study:

  • To investigate the connectivity of all inhibitory neurons in the mouse visual cortex.
  • To create a detailed wiring diagram of cortical inhibition.
  • To identify organizing principles of inhibitory circuits.

Main Methods:

  • Utilized millimetre-scale volumetric electron microscopy.
  • Segmented a neuronal population of 1,352 cells.
  • Classified inhibitory neurons by dendritic targeting and excitatory neurons by synaptic input.

Main Results:

  • Generated a wiring diagram of inhibition with over 70,000 synapses.
  • Identified a class of disinhibitory specialists targeting basket cells.
  • Revealed specific inhibitory targeting of excitatory neuron subpopulations and 'motif groups'.

Conclusions:

  • Discovered novel organizing principles for cortical inhibition.
  • Established a foundation for linking neuronal atlases with wiring diagrams.
  • Provides a comprehensive map of inhibitory connectivity in the visual cortex.