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Neuroplasticity in human callosal dysgenesis: a diffusion tensor imaging study.

Fernanda Tovar-Moll1, Jorge Moll, Ricardo de Oliveira-Souza

  • 1Department of Anatomy, Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Brazil. tovarmof@ninds.nih.gov

Cerebral Cortex (New York, N.Y. : 1991)
|April 22, 2006
PubMed
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Callosal dysgenesis (CD) involves abnormal brain wiring. In humans with CD, some white matter tracts maintain normal organization, while others form novel, aberrant pathways like the sigmoid bundle, revealing insights into brain plasticity.

Area of Science:

  • Neuroscience
  • Neuroimaging
  • Developmental Neuroscience

Background:

  • Callosal dysgenesis (CD) is a feature of many neurodevelopmental disorders.
  • The underlying mechanisms of CD and associated aberrant brain circuitry remain largely unknown.
  • Previous research has primarily utilized animal models.

Purpose of the Study:

  • To investigate the aberrant circuitry in human CD using advanced neuroimaging techniques.
  • To identify and characterize novel white matter tracts in individuals with CD.
  • To explore evidence of neural plasticity in the context of callosal malformations.

Main Methods:

  • Magnetic Resonance Diffusion Tensor Imaging (DTI) was employed to visualize white matter tracts.
  • Tractography was used to reconstruct and analyze the connectivity patterns.

Related Experiment Videos

  • Human subjects with varying degrees of callosal dysgenesis were studied.

    • Main Results:

    • Fibers within callosal remnants or hypoplastic corpus callosum (CC) largely connect expected neocortical regions.
    • Callosal remnants and hypoplastic CCs exhibit a topography similar to normal CCs.
    • Two significant abnormal tracts were identified: the Probst bundle (PB) and a novel sigmoid, asymmetrical aberrant bundle connecting frontal to occipitoparietal regions.
    • The PB shows topographic organization and ipsilateral connectivity, while the sigmoid bundle is a long, heterotopic commissural tract.

    Conclusions:

    • Developing human brains with impeded corpus callosum (CC) formation exhibit a mix of preserved and altered fiber properties.
    • Aberrant white matter tracts, like the sigmoid bundle, demonstrate unique organizational principles.
    • These findings suggest specific adaptive mechanisms or constraints in human brain development when CC formation is disrupted.