Mapping Corpus Callosum Deficits in Autism: An Index of Aberrant Cortical Connectivity

Christine N. Vidal, Rob Nicolson, Timothy J. DeVito, Kiralee M. Hayashi, Jennifer A. Geaga, Dick J. Drost, Peter C. Williamson, Nagalingam Rajakumar, Yihong Sui, Rebecca A. Dutton, Arthur W. Toga, Paul M. Thompson

Research output: Contribution to journalArticlepeer-review

185 Scopus citations

Abstract

Background: Volumetric studies have reported reductions in the size of the corpus callosum (CC) in autism, but the callosal regions contributing to this deficit have differed among studies. In this study, a computational method was used to detect and map the spatial pattern of CC abnormalities in male patients with autism. Methods: Twenty-four boys with autism (aged 10.0 ± 3.3 years) and 26 control boys (aged 11.0 ± 2.5 years) underwent a magnetic resonance imaging (MRI) scan at 3 Tesla. Total and regional areas of the CC were determined using traditional morphometric methods. Three-dimensional (3D) surface models of the CC were also created from the MRI scans. Statistical maps were created to visualize morphologic variability of the CC and to localize regions of callosal thinning in autism. Results: Traditional morphometric methods detected a significant reduction in the total callosal area and in the anterior third of the CC in patients with autism; however, 3D maps revealed significant reductions in both the splenium and genu of the CC in patients. Conclusions: Statistical maps of the CC revealed callosal deficits in autism with greater precision than traditional morphometric methods. These abnormalities suggest aberrant connections between cortical regions, which is consistent with the hypothesis of abnormal cortical connectivity in autism.

Original languageEnglish
Pages (from-to)218-225
Number of pages8
JournalBiological Psychiatry
Volume60
Issue number3
DOIs
StatePublished - 1 Aug 2006
Externally publishedYes

Keywords

  • Autism
  • MRI
  • corpus callosum
  • imaging
  • three-dimensional (3D) maps
  • white matter

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