White Matter and Visuospatial Processing in Autism: A Constrained Spherical Deconvolution Tractography Study
Article first published online: 18 MAR 2013
© 2013 International Society for Autism Research, Wiley Periodicals, Inc.
Volume 6, Issue 5, pages 307–319, October 2013
How to Cite
McGrath, J., Johnson, K., O'Hanlon, E., Garavan, H., Gallagher, L. and Leemans, A. (2013), White Matter and Visuospatial Processing in Autism: A Constrained Spherical Deconvolution Tractography Study. Autism Res, 6: 307–319. doi: 10.1002/aur.1290
- Issue published online: 22 OCT 2013
- Article first published online: 18 MAR 2013
- Manuscript Accepted: 15 FEB 2013
- Manuscript Received: 7 SEP 2012
- Molecular Medicine Ireland. Grant Number: 4AA-G04005-0-S06
- diffusion MRI;
- constrained spherical deconvolution;
- visuospatial processing;
- inferior fronto-occipital fasciculus
Autism spectrum disorders (ASDs) are associated with a marked disturbance of neural functional connectivity, which may arise from disrupted organization of white matter. The aim of this study was to use constrained spherical deconvolution (CSD)-based tractography to isolate and characterize major intrahemispheric white matter tracts that are important in visuospatial processing. CSD-based tractography avoids a number of critical confounds that are associated with diffusion tensor tractography, and to our knowledge, this is the first time that this advanced diffusion tractography method has been used in autism research. Twenty-five participants with ASD and aged 25, intelligence quotient-matched controls completed a high angular resolution diffusion imaging scan. The inferior fronto-occipital fasciculus (IFOF) and arcuate fasciculus were isolated using CSD-based tractography. Quantitative diffusion measures of white matter microstructural organization were compared between groups and associated with visuospatial processing performance. Significant alteration of white matter organization was present in the right IFOF in individuals with ASD. In addition, poorer visuospatial processing was associated in individuals with ASD with disrupted white matter in the right IFOF. Using a novel, advanced tractography method to isolate major intrahemispheric white matter tracts in autism, this research has demonstrated that there are significant alterations in the microstructural organization of white matter in the right IFOF in ASD. This alteration was associated with poorer visuospatial processing performance in the ASD group. This study provides an insight into structural brain abnormalities that may influence atypical visuospatial processing in autism. Autism Res 2013, ●●: ●●–●●. © 2013 International Society for Autism Research, Wiley Periodicals, Inc.