Abstract
Neuroanatomical correlates of apathy and disinhibition, behavioral abnormalities in behavioral variant Frontotemporal dementia (bvFTD) remain unclear. In this study 45 participants (25 bvFTD patients and 20 controls) provided data on clinical, neuropsychological, behavioral (on Frontal Systems Behavior (FrSBe) Scale), cortical volume (on voxel-based morphometry (VBM)) and tract based spatial fractional anisotropy ((FA) on magnetic resonance imaging (MRI), allowing examination of the neural correlates of apathy and disinhibition. The patients with bvFTD had predominant grey matter loss and corresponding white matter fractional anisotropy reduction in the frontal and temporal lobe compared to the controls. Grey matter loss in frontal, temporal and limbic structures correlated with apathy and degeneration in temporal limbic brain areas correlated with disinhibition. FA changes in inferior fronto-occipital fasciculus and forceps minor correlated with apathy and fibre integrity changes in the superior longitudinal fasciculus correlated with disinhibition. The current study suggests that apathy and disinhibition arises due to changes in the frontal, temporal and limbic brain areas in bvFTD.
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Acknowledgements
The authors wish to thank the participants in this study and their caregivers.
Author Contribution: SR, BC and TV carried out the study and did data collection and data analysis. SR, KC, JV and PSM contributed to the preparation of the manuscript. PSM conceived the idea of and designed the study and got the grant for carrying out the study. JV contributed to getting the grant for the study.
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This study was supported by grants provided by the National Institute on Aging (NIA), USA (grant no. R21AG029799 to JV and R01AG039330–01) to PSM.
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Supplementary Fig. 1
Regions of reduced gray matter density (red-yellow) in behavioral variant FTD subjects compared to controls, P < 0.05(FWE corrected). (PNG 316 kb)
Supplementary Fig. 2
Patterns of white matter tract degeneration in behavioral variant group compared with controls. Tract based spatial statistics voxel wise group differences (significance level of P < 0.05, FWE corrected for multiple comparisons across space using threshold free cluster enhancement) are shown in red-yellow (FA). (PNG 362 kb)
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Sheelakumari, R., Bineesh, C., Varghese, T. et al. Neuroanatomical correlates of apathy and disinhibition in behavioural variant frontotemporal dementia. Brain Imaging and Behavior 14, 2004–2011 (2020). https://doi.org/10.1007/s11682-019-00150-3
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DOI: https://doi.org/10.1007/s11682-019-00150-3