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An extended retinotopic map of mouse cortex.

Jun Zhuang1, Lydia Ng1, Derric Williams1

  • 1Allen Institute for Brain Science, Seattle, United States.

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New research maps visual processing areas in the mouse brain, revealing 16 distinct retinotopically organized regions. This study highlights a mismatch between architectonic and retinotopic borders, advancing our understanding of cortical organization.

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Area of Science:

  • Neuroscience
  • Visual System Organization
  • Cortical Mapping

Background:

  • Visual perception relies on specialized cortical areas identified by architectonic and retinotopic mapping.
  • Previous studies distinguished these areas but lacked detailed retinotopic maps extending into all cortical regions.

Purpose of the Study:

  • To generate high-resolution retinotopic maps in mice using advanced imaging techniques.
  • To investigate the precise alignment of architectonic and retinotopic borders.
  • To identify and characterize additional retinotopically organized visual areas in the mouse cortex.

Main Methods:

  • Utilized fluorescence imaging and GCaMP6 reporter mice for in vivo retinotopic mapping.
  • Generated detailed visual field maps across the mouse cortex.
  • Aligned retinotopic maps with established architectonic borders.

Main Results:

  • Identified novel regions of retinotopic organization extending into barrel and retrosplenial cortices.
  • Discovered a misalignment between architectonic borders and the retinotopic transition at the vertical meridian.
  • Revealed complementary visual space representations in four areas bordering V1 (LM, P, PM, RL), with central hemifield overlap.
  • Extended the known number of distinct retinotopically organized regions in the mouse cortex to 16.

Conclusions:

  • Architectonic borders do not precisely align with functional retinotopic organization at the vertical meridian.
  • The mouse cortex contains at least 16 distinct retinotopically organized visual areas.
  • These findings refine our understanding of the functional architecture of the mouse visual cortex.