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Multiscale Investigations of Cortical Processing by Integrating Laminar Polytrodes and Optogenetics with Micro Electrocorticography in Rodents
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Visual Corticocortical Inputs to Ferret Area 18.

Reem Khalil1,2, Moody Roberne Jensy Saint Louis2, Shaima Alsuwaidi1,3

  • 1Department of Biology, Chemistry and Environmental Sciences, American University of Sharjah, Sharjah, United Arab Emirates.

Frontiers in Neuroanatomy
|October 29, 2020
PubMed
Summary
This summary is machine-generated.

This study maps feedback connections to ferret visual area 18, revealing similarities and differences with area 17 feedback. Key findings include distinct visual field input patterns, crucial for understanding mammalian visual cortex organization.

Keywords:
V2brainextrastriatefeedbackinterareal projectionsvisual cortex

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Area of Science:

  • Neuroscience
  • Visual Cortex Anatomy
  • Mammalian Brain Circuits

Background:

  • The adult mammalian brain features interconnected visual cortical areas via feedforward and feedback circuits.
  • Understanding extrastriate feedback projections is crucial for deciphering visual information processing.

Purpose of the Study:

  • To map the topography of feedback projections to ferret visual area 18 from extrastriate areas.
  • To characterize the anatomical organization of the extrastriate feedback pool targeting area 18.
  • To compare feedback projections to area 18 with those previously described for area 17.

Main Methods:

  • Injected cholera toxin B subunit (CTb) tracer into ferret (Mustela putorius furo) area 18.
  • Visualized retrogradely labeled cells in extrastriate cortex (areas 19, 21, Ssy, etc.).
  • Analyzed distribution, pattern, and laminar origins of feedback projections.

Main Results:

  • Multiple extrastriate areas (19, 21, Ssy) project feedback to area 18, primarily from infragranular layers.
  • The closest rostral area provides the largest feedback proportion and highest cell density to area 18.
  • Feedback cell spacing is similar to area 17, but area 18 receives unique dorsal input from ventral cortex (upper visual field).

Conclusions:

  • Feedback projections to ferret visual areas 17 and 18 share organizational similarities but exhibit distinct topographical differences.
  • Differences in input topography, particularly visual field representation, likely account for variations in feedback patterns.
  • This research enhances understanding of the complex feedback network within the mammalian visual cortex.