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Related Concept Videos

Neural Circuits01:25

Neural Circuits

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Neural circuits and neuronal pools are two of the main structures found in the nervous system. Neural circuits are networks of neurons that work together to carry out a specific task or process. They consist of interconnected neurons and glial cells, which provide structural and metabolic support.
Neuronal pools are collections of nerve cells with similar functions and interact through chemical and electrical signals. These pools include both interneurons (the central neural circuit nodes that...
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The Role of Ion Channels in Neuronal Computation01:19

The Role of Ion Channels in Neuronal Computation

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A postsynaptic neuron usually receives numerous impulses from several other presynaptic neurons. The axon hillock of the postsynaptic neuron integrates all these signals and determines the likelihood of firing an action potential.
Sometimes a single EPSP is strong enough to induce an action potential in the postsynaptic neuron. However, multiple presynaptic inputs must often create EPSPs around the same time for the postsynaptic neuron to be sufficiently depolarized to fire an action potential....
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Related Experiment Video

Updated: Nov 5, 2025

A Guide to In vivo Single-unit Recording from Optogenetically Identified Cortical Inhibitory Interneurons
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A Guide to In vivo Single-unit Recording from Optogenetically Identified Cortical Inhibitory Interneurons

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Cortical disinhibitory circuits: cell types, connectivity and function.

Klas Kullander1, Lisa Topolnik2

  • 1Department of Neuroscience, Uppsala University, Uppsala, Sweden.

Trends in Neurosciences
|May 19, 2021
PubMed
Summary
This summary is machine-generated.

Circuit disinhibition dynamically balances brain excitation and inhibition, crucial for information flow during complex behaviors. Vasoactive intestinal polypeptide (VIP) interneurons play a key role in this process across cortical circuits.

Keywords:
GABAergic inhibitionVIPinterneuronneuromodulationnicotinic α2 receptorsomatostatin

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Circuit Neuroscience

Background:

  • Dynamic excitation/inhibition balance is a conserved motif for information processing.
  • GABAergic inhibitory interneurons in cortical circuits form connections enabling disinhibition.
  • Vasoactive intestinal polypeptide (VIP) expressing GABAergic cells are key modulators of disinhibition.

Purpose of the Study:

  • To discuss inhibitory neuron subtypes involved in cortical disinhibition.
  • To focus on local and long-range synaptic connections driving disinhibition.
  • To highlight regulatory roles of disinhibition in maintaining excitation/inhibition balance.

Main Methods:

  • Review of literature on inhibitory neuron subtypes.
  • Analysis of synaptic connections within cortical circuits.
  • Discussion of disinhibitory mechanisms and their functional impact.

Main Results:

  • Identified VIP-expressing interneurons as central to disinhibitory modulation.
  • Highlighted anatomical basis for disinhibition via interneuron connectivity.
  • Emphasized multiple layers of disinhibition regulating behavior.

Conclusions:

  • Disinhibition is a critical mechanism for shaping information flow in the brain.
  • VIP interneurons are pivotal in mediating disinhibition in cortical circuits.
  • Maintaining excitation/inhibition balance through disinhibition is essential for cognitive functions.