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Related Experiment Video

Updated: Sep 15, 2025

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Characterizing optogenetically mediated rebound effects in anaesthetized mouse primary visual cortex.

Jared T Shapiro1, Nicole M Michaud1, Nathan A Crowder1

  • 1Department of Psychology and Neuroscience, Dalhousie University, Halifax, Nova Scotia, Canada.

The Journal of Physiology
|July 16, 2025
PubMed
Summary
This summary is machine-generated.

Post-inhibitory rebounds in mouse visual cortex are amplified by strong visual stimuli and vary with interneuron type. This research explores how network activity influences these rebound effects in cortical circuits.

Keywords:
electrophysiologyinterneuronsneural circuitspost‐inhibitory rebound effecttransgenic mouse

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Area of Science:

  • Neuroscience
  • Computational Neuroscience
  • Systems Neuroscience

Background:

  • Optogenetic tools enable investigation of neural circuits, particularly in the mouse primary visual cortex (V1).
  • Photostimulation of inhibitory interneuron subtypes (parvalbumin+, somatostatin+, vasoactive intestinal peptide+) can modulate excitatory pyramidal neuron responses.
  • Previous studies noted rebound spiking post-photostimulation, but a systematic analysis was lacking.

Purpose of the Study:

  • To systematically characterize optogenetically mediated rebound effects in V1 pyramidal cells and interneurons.
  • To investigate the influence of V1 network activity and connectivity on rebound magnitude.
  • To compare rebound effects elicited by stimulating different interneuron subtypes.

Main Methods:

  • Optogenetic photostimulation of parvalbumin (Pvalb+), somatostatin (SOM+), and vasoactive intestinal peptide (VIP+) interneurons in anesthetized mice.
  • Recording of rebound effects in pyramidal cells and interneurons.
  • Correlation of rebound magnitude with visual stimulus strength and network activity.

Main Results:

  • Rebound effects were largest when interneuron photostimulation coincided with strong visual activation of V1.
  • Directly stimulated interneurons exhibited post-activation effects distinct in polarity and timing from rebounds.
  • Photostimulation of Pvalb+ interneurons produced the most significant rebound effects.

Conclusions:

  • Both cellular and network mechanisms contribute to rebound effects in the mouse V1.
  • Visual cortex activation level modulates post-inhibitory rebound magnitude.
  • Distinct interneuron subtypes yield different rebound characteristics, offering insights into excitation- inhibition balance.