The neural correlates of motor intentional disorders in patients with subcortical vascular cognitive impairment
Subcortical vascular cognitive impairment (SVCI) refers to cognitive impairment associated with small vessel disease. Motor intentional disorders (MID) have been reported in patients with SVCI. However, there are no studies exploring the neuroanatomical regions related to MID in SVCI patients. The aim of this study, therefore, was to investigate the neural correlates of MID in SVCI patients. Thirty-one patients with SVCI as well as 10 healthy match control participants were included. A “Pinch-Grip” apparatus was used to quantify the force control capabilities of the index finger in four different movement phases including initiation, development, maintenance, and termination. All participants underwent magnetic resonance imaging (MRI). Topographical cortical areas and white matter tracts correlated with the performances of the four different movement phases were assessed by the surface-based morphometry and tract-based spatial statistics analyses. Poorer performance in the maintenance task was related to cortical thinning in bilateral dorsolateral prefrontal, orbitofrontal and parietal cortices, while poorer performance in the termination task was associated with the disruption of fronto-parietal cortical areas as well as the white matter tracts including splenium and association fibers such as superior longitudinal fasciculus. Our study demonstrates that cortical areas and underlying white matter tracts associated with fronto-parietal attentional system play an important role in motor impersistence and perseveration in SVCI patients.
KeywordsMotor intentional disorder Subcortical vascular cognitive impairment Cortical thickness Tract-based spatial statistics
This study was supported by a grant of the Korea Healthcare technology R&D Project, Ministry for Health, Welfare and Family Affairs, Republic of Korea (A090632), a grant of the Original Technology Research Program for Brain Science through the National Research Foundation of Korea (NRF) funded by the Korean government (MSIP) (No. 2014M3C7A1064752), by the Korean Science and Engineering Foundation (KOSEF) NRL program grant funded by the Korean government (MEST; 2011-0028333 & 2010-0014026), by Samsung Biomedical Research Institute grants (C-B0-217-3), and by a grant of the Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health &Welfare, Republic of Korea (HI14C3484).
Compliance with ethical standards
Informed consent was obtained from all participants. The study protocol was approved by the Institutional Review Board of Samsung Medical Center.
Conflicts of interest
G. H. Kim, K. Jung, O. Kwon, H. Kwon, B. H. Lee, D. S. Yoon and J. W. Hwang report no disclosures. S. W. Seo, MD, J. H. Kim, J. H. Roh, M. J. Kim, J. H. Jeong, J. M. Lee, H. You and K. Heilman report no disclosures. D. L. Na reports no disclosures.
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