Abstract
Mounting evidence suggests that poorer motor skills may be related to more severe autism symptoms. This study investigated if atypical white matter microstructure in the brain mediated the relationship between motor skills and ASD symptom severity. Sixty-seven males with ASD and 42 males with typical development (5–33 years old) completed a diffusion tensor imaging scan and measures of grip strength, finger tapping, and autism symptom severity. Within the ASD group, weaker grip strength predicted more severe autism symptoms. Fractional anisotropy of the brainstem’s corticospinal tract predicted both grip strength and autism symptom severity and mediated the relationship between the two. These findings suggest that brainstem white matter may contribute to autism symptoms and grip strength in ASD.
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Acknowledgments
This work was supported by the National Institute of Mental Health [RO1 MH080826 to JEL, ALA, NL, EDB; RO1 MH084795 to JEL, NL], the Eunice Kennedy Shriver National Institute of Child Health and Human Development [T32 HD07489 to BGT, and P30 HD003352 to the Waisman Center], the Hartwell Foundation [to BGT], the Poelman Foundation [to EDB]. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institute of Mental Health, the National Institute of Child Health & Development, or the National Institutes of Health. We thank Annahir Cariello, Celeste Knoles, Chad Ennis, Steven Hesse, Daniel Witt, Kristine McLaughlin, Emily Gerstein, and Joanna Mussey for their contributions to this project. We sincerely thank the children, adolescents, and adults with autism, the individuals with typical development, and all the families who participated in this study.
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Travers, B.G., Bigler, E.D., Tromp, D.P.M. et al. Brainstem White Matter Predicts Individual Differences in Manual Motor Difficulties and Symptom Severity in Autism. J Autism Dev Disord 45, 3030–3040 (2015). https://doi.org/10.1007/s10803-015-2467-9
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DOI: https://doi.org/10.1007/s10803-015-2467-9