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Related Experiment Videos

Mirror symmetric topographic maps can arise from activity-dependent synaptic changes.

Reiner Schulz1, James A Reggia

  • 1Department of Computer Science, UMIACS, University of Maryland, College Park, MD 20742, USA. rschulz@cs.umd.edu

Neural Computation
|April 15, 2005
PubMed
Summary

Adjacent topographic maps in the sensory neocortex can form through activity-dependent synaptic changes. This computational model reveals how stimulus patterns influence map orientation and may explain atypical map formations in neurodevelopmental disorders.

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Area of Science:

  • Neuroscience
  • Computational Biology
  • Developmental Neuroscience

Background:

  • Sensory neocortex commonly exhibits multiple adjacent, mirror-image topographic maps.
  • Genetically controlled chemical markers and thalamocortical activity are thought to establish these maps during development.

Purpose of the Study:

  • To investigate the role of activity-dependent synaptic changes in the formation of adjacent topographic maps.
  • To explore how stimulus input influences map orientation and symmetry.

Main Methods:

  • Utilized a computational model to simulate map formation.
  • Analyzed the influence of afferent distribution radius versus intracortical interaction radius.
  • Examined the impact of input stimulus probability distributions.

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Main Results:

  • Adjacent mirror-image topographic maps can emerge from activity-dependent synaptic plasticity.
  • The distribution radius of afferents relative to intracortical interactions is critical.
  • Input stimulus probability distribution significantly influences which map edges become adjacent.

Conclusions:

  • Activity-dependent synaptic changes contribute to the orientation of adjacent cortical maps.
  • The model predicts occasional atypical rotational symmetries in adjacent maps.
  • Atypical map orientations may be linked to abnormal cortical information processing in neurodevelopmental disorders.