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Proposal for human visual pathway in the extrastriate cortex by fiber tracking method using diffusion-weighted MRI.

Sang-Han Choi1, Gangwon Jeong2, Young-Bo Kim3

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|July 11, 2020
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Summary

Researchers re-traced the human visual "where-information" pathway using advanced MRI. Findings suggest the classical dorsal stream is unlikely, proposing a new angular gyrus-based model for visual spatial processing.

Keywords:
Angular gyrusDorsal streamFiber trackingHuman connectome projectVertical occipital fasciculusVisual pathway

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Area of Science:

  • Neuroscience
  • Human Neuroanatomy
  • Visual Processing

Background:

  • The human visual cortex has distinct "what" (ventral stream) and "where" (dorsal stream) processing pathways.
  • Ventral stream fibers are well-defined, but dorsal stream pathways remain poorly understood in neuroanatomy.

Purpose of the Study:

  • To investigate and trace the dorsal stream fibers of the human visual cortex.
  • To clarify the anatomical pathways involved in "where-information" processing.
  • To propose a modified model of the human visual pathway.

Main Methods:

  • Utilized 7.0T diffusion-weighted magnetic resonance imaging (dMRI) for fiber tracking.
  • Employed data from a healthy subject and the Human Connectome Project dataset.
  • Defined visual areas using the Brainnetome atlas for connectivity-based parcellation.

Main Results:

  • The study found that the classical dorsal stream pathway is unlikely to exist as previously thought.
  • Demonstrated novel fiber connections between the angular gyrus and visual cortex (MT).
  • Identified connections between the angular gyrus and temporal cortex (IT), suggesting a new pathway.

Conclusions:

  • A modified two-pathway model for "where-information" processing, involving the angular gyrus, is proposed.
  • This revised model offers a new perspective on human visual spatial processing.
  • The findings challenge traditional models of the dorsal visual stream.