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Related Concept Videos

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Related Experiment Video

Updated: Feb 14, 2026

Author Spotlight: Deciphering Neural Circuit Formation from Two-Photon Microscopy and Single Neuron Imaging
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Postnatal refinement of interareal feedforward projections in ferret visual cortex.

Reem Khalil1,2,3, Violeta Contreras-Ramirez2, Jonathan B Levitt4,5

  • 1Biology, Chemistry, and Environmental Sciences Department, American University of Sharjah, Sharjah, UAE.

Brain Structure & Function
|February 25, 2018
PubMed
Summary

Feedforward (FF) brain circuits refine around eye opening, mirroring feedback (FB) circuit development. Postnatal visual experience is crucial for refining both FF and FB cortical circuits in ferrets.

Keywords:
CorticocorticalExtrastriateV1Visual development

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Area of Science:

  • Neuroscience
  • Developmental Neuroscience
  • Visual System Development

Background:

  • Feedforward (FF) and feedback (FB) cortical circuits are crucial for visual processing.
  • Understanding the developmental refinement of these circuits is key to understanding brain development.

Purpose of the Study:

  • To investigate the postnatal refinement of FF projections from ferret primary visual cortex (V1) to extrastriate targets.
  • To compare the developmental timeline of FF circuit refinement with that of FB circuits.
  • To determine if FF pathways to different visual areas refine at similar rates.

Main Methods:

  • Injected cholera toxin subunit beta (CTb) tracer into V1 of juvenile ferrets.
  • Visualized and quantified labeled axon terminals in extrastriate target areas (18, 19, 21, Ssy).
  • Analyzed bouton density, interbouton intervals, and axon density over a postnatal period (4-8 weeks).

Main Results:

  • Bouton density of FF projections to areas 18, 19, and 21 decreased steadily from 4 to 8 weeks postnatal.
  • Refinement in area Ssy was delayed, occurring after 6 weeks.
  • Increased interbouton intervals and decreased axon density were observed in multiple target areas.

Conclusions:

  • FF circuits from V1 to extrastriate targets remodel largely synchronously post-eye opening.
  • FF and FB cortical circuits exhibit broadly similar developmental timecourses.
  • Postnatal visual experience is critical for the refinement of both FF and FB cortical circuits.