Abstract
While the functional correlates of spelling impairment have been rarely investigated, to our knowledge no study exists regarding the structural characteristics of spelling impairment and potential changes with interventions. Using diffusion tensor imaging at 3.0 T, we here therefore sought to investigate (a) differences between children with poor spelling abilities (training group and waiting group) and controls, and (b) the effects of a morpheme-based spelling intervention in children with poor spelling abilities on DTI parameters. A baseline comparison of white matter indices revealed significant differences between controls and spelling-impaired children, mainly located in the right hemisphere (superior corona radiata (SCR), posterior limb of internal capsule, superior longitudinal fasciculus). After 5 weeks of training, spelling ability improved in the training group, along with increases in fractional anisotropy and decreases of radial diffusivity in the right hemisphere compared to controls. In addition, significantly higher decreases of mean diffusivity in the right SCR for the spelling-impaired training group compared to the waiting group were observed. Our results suggest that spelling impairment is associated with differences in white-matter integrity in the right hemisphere. We also provide first indications that white matter changes occur during successful training, but this needs to be more specifically addressed in future research.
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Acknowledgments
The research presented in this paper was supported by grants from the Styrian government (Nr. A27214001062) and the Jubilee Fund of the Austrian National Bank (Nr. A26E16020013). The authors wish to express their large gratitude to Gwen Douaud, Nadja Kozel, Bernd Schneeberger, Johanna Vogl and Stefanie Rohrer who greatly contributed to this research project. The authors also thank Karin Brodtrager for technical assistance in the acquisition of the scans and Franz Ebner, MD, for continued infrastructural support.
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Gebauer, D., Fink, A., Filippini, N. et al. Differences in integrity of white matter and changes with training in spelling impaired children: a diffusion tensor imaging study. Brain Struct Funct 217, 747–760 (2012). https://doi.org/10.1007/s00429-011-0371-4
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DOI: https://doi.org/10.1007/s00429-011-0371-4