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Patterns of connections in rat visual cortex.

R Malach1

  • 1Center for Neurosciences and Behavioural Research, Weizmann Institute of Science, Rehovot, Israel.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|November 1, 1989
PubMed
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Researchers mapped connections in rat visual cortex to clarify its organization. Findings reveal a global map with modular structures, suggesting a potential homolog of area V2.

Area of Science:

  • Neuroscience
  • Visual Cortex Organization
  • Comparative Anatomy

Background:

  • Defining visual areas in the rodent extrastriate cortex is complex, with schemes proposing 2 to 13 distinct areas.
  • Understanding the organizational layout of the visual cortex is crucial for advancing research in this field.

Purpose of the Study:

  • To investigate patterns of connections within the rat visual cortex.
  • To better define the organizational layout and boundaries of visual areas in rodents.

Main Methods:

  • Used in vivo fluorescent tracer bisbenzimide to map callosal connections.
  • Injected WGA-HRP into striate and extrastriate cortex, using callosal patterns as landmarks.
  • Analyzed tangential distribution of ipsilateral corticocortical connections in flattened cortex preparations.

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Main Results:

  • Revealed widespread, patchy connections within the rat visual cortex.
  • Observed that neighboring sites are more connected than distant ones.
  • Identified interconnectedness among extrastriate sites sharing common striate cortex inputs.
  • Noted interdigitating connection patterns from opposite striate cortex poles.

Conclusions:

  • The extrastriate band adjacent to the striate cortex exhibits a single, global map organization.
  • A modular organization is evident within the global map, corresponding to multiple visuotopic representations.
  • The identified global map may represent the rat homolog of area V2 found in cats and monkeys.