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Brain weight differences associated with induced focal microgyria.

Ann M Peiffer1, R Holly Fitch, Jennifer J Thomas

  • 1Department of Psychology; Behavioral Neuroscience Division, University of Connecticut, USA. ann.peiffer@uconn.edu

BMC Neuroscience
|June 26, 2003
PubMed
Summary

Early focal brain injury in development causes significant reductions in brain weight and volume, particularly in the neocortex. This highlights the widespread impact of early developmental damage on neural systems.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Brain Injury Research

Background:

  • Disrupting neural migration on postnatal day 1 (P1) causes 4-layered microgyria.
  • This developmental injury induces widespread neural reorganization affecting electrophysiology, behavior, and anatomy.

Purpose of the Study:

  • Investigate changes in brain weight as an index of global neural system disruption.
  • Assess the impact of focal damage to the developing cortical plate on brain development.

Main Methods:

  • Induction of bilateral focal freezing necrosis on postnatal day 1 (P1) in subjects.
  • Measurement of brain weight and volume in microgyric and control subjects.

Main Results:

  • Microgyric subjects exhibited a dramatic reduction in overall brain weight.

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  • Decreased total brain volume was observed, with a disproportionately larger decrease in neocortical volume.
  • These effects were consistent across varied environments, ages, and sexes.

    • Conclusions:

    • Substantial brain reorganization is triggered by bilateral freezing damage during development.
    • Early focal injuries have profound re-organizational effects on distributed brain systems, especially the cerebral cortex.
    • Findings have critical implications for understanding developmental brain injury impacts.