Abstract
Recent work in healthy adults suggests that white matter organization within the superior longitudinal fasciculus (SLF) may, at least partly, explain individual differences in fine motor skills. The SLF is also often implicated in the neurobiology underlying attention deficit hyperactivity disorder (ADHD) as part of the attention network connecting frontal and parietal regions. While ADHD is primarily characterized by inattention, impulsivity and/or hyperactivity, atypical fine motor control is a common comorbid feature. This study aimed to investigate the association between reduced fine motor skills in ADHD and microstructural properties within the SLF. Participants were 55 right-handed children with ADHD and 61 controls aged 9–11 years. Fine motor control was assessed using the Grooved Pegboard task. Children underwent high angular resolution diffusion MRI. Following pre-processing, constrained spherical deconvolution tractography was performed to delineate the three SLF branches bilaterally. Children with ADHD showed significantly poorer fine motor performance relative to controls in the non-dominant hand, indicated by significantly slower left handed Grooved Pegboard task performance. This slower response time for the non-dominant (left) hand was significantly associated with reduced apparent fibre density within the right SLF I, and reduced right SLF I, II and III volume. This finding was independent of spatial attention performance. These data support previous reports indicating that children with ADHD have poorer fine motor performance than controls in their non-dominant hand, and indicates that the neurobiological basis for impaired fine motor control may involve white matter properties within the contralateral SLF. This suggests that white matter properties in fronto-parietal areas may have broader implications than attention.
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This project is funded by Project Grants from the Australian National Health and Medical Research Council (NHRMC) (1,065,895, 1,008,522). A/Prof Sciberras’ position is funded by an NHMRC Career Development Fellowship (1,110,688: 2016–21) and a Veski Inspiring Women’s Fellowship. A/Prof Efron is funded by a Clinician Scientist Fellowship from the Murdoch Children’s Research Institute (MCRI). MCRI is supported by the Victorian Government’s Operational Infrastructure Support Program.
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The authors declare that they have no conflict of interest. All procedures performed in this study were approved by, and conducted in accordance with, the ethical standards of the institutional human research ethics committee. In doing so, they were performed according to the standards of the 1964 Helsinki declaration and its later amendments or comparable standards. Informed consent was obtained from all individual participants included in this study.
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Hyde, C., Sciberras, E., Efron, D. et al. Reduced fine motor competence in children with ADHD is associated with atypical microstructural organization within the superior longitudinal fasciculus. Brain Imaging and Behavior 15, 727–737 (2021). https://doi.org/10.1007/s11682-020-00280-z
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DOI: https://doi.org/10.1007/s11682-020-00280-z