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The basic repeating modules of the cerebral cortical circuit.

Toshihiko Hosoya1,2

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Proceedings of the Japan Academy. Series B, Physical and Biological Sciences
|August 14, 2019
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Summary

Researchers found that major cell types in layer 5 of the cerebral cortex form repeating microcolumns arranged in a hexagonal lattice. These microcolumns act as functional units for information processing across brain areas.

Keywords:
cerebral cortexlanguagemotor controlneocortexneuronssensory processing

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Area of Science:

  • Neuroscience
  • Cellular Biology
  • Systems Neuroscience

Background:

  • The fundamental organization of the cerebral cortical circuit remains poorly understood.
  • It is unclear if diverse cortical cell types form repeated modular units.

Purpose of the Study:

  • To investigate the organizational principles of cell types in the cerebral cortex.
  • To determine if cortical cell types form modular, repeated structures.

Main Methods:

  • Analysis of cell types in cortical layer 5.
  • Identification of radial clusters (microcolumns) and their arrangement.
  • Investigation of microcolumn structure, activity, and development.

Main Results:

  • Major cell types in cortical layer 5 form a lattice structure of microcolumns.
  • Microcolumns, composed of distinct excitatory and inhibitory neurons, are found in visual, motor, and language areas.
  • These microcolumns exhibit modular synaptic circuits and neuronal activity, functioning as information processing units.
  • Microcolumn development appears independent of cell lineage but coordinated by gap junctions.

Conclusions:

  • Neurons in cortical layer 5 organize into a brainwide lattice of functional microcolumns.
  • Massively repeated microcolumns likely underlie diverse cortical functions, including sensory perception, motor control, and language processing.