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Degradation of cognitive timing mechanisms in behavioural variant frontotemporal dementia
Henley, Susie M.D.
;
Downey, Laura E.
;
Nicholas, Jennifer M.
;
Kinnunen, Kirsi M.
;
Golden, Hannah L.
;
Buckley, Aisling
;
Mahoney, Colin J.
;
Crutch, Sebastian J.
. - : Pergamon Press, 2014
Abstract:
The current study examined motor timing in frontotemporal dementia (FTD), which manifests as progressive deterioration in social, behavioural and cognitive functions. Twenty-patients fulfilling consensus clinical criteria for behavioural variant FTD (bvFTD), 11 patients fulfilling consensus clinical criteria for semantic-variant primary progressive aphasia (svPPA), four patients fulfilling criteria for nonfluent/agrammatic primary progressive aphasia (naPPA), eight patients fulfilling criteria for Alzheimer׳s disease (AD), and 31 controls were assessed on both an externally- and self-paced finger-tapping task requiring maintenance of a regular, 1500 ms beat over 50 taps. Grey and white matter correlates of deficits in motor timing were examined using voxel-based morphometry (VBM) and diffusion tensor imaging (DTI). bvFTD patients exhibited significant deficits in aspects of both externally- and self-paced tapping. Increased mean inter-response interval (faster than target tap time) in the self-paced task was associated with reduced grey matter volume in the cerebellum bilaterally, right middle temporal gyrus, and with increased axial diffusivity in the right superior longitudinal fasciculus, regions and tracts which have been suggested to be involved in a subcortical–cortical network of structures underlying timing abilities. This suggests that such structures can be affected in bvFTD, and that impaired motor timing may underlie some characteristics of the bvFTD phenotype.
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Article
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http://www.ncbi.nlm.nih.gov/pubmed/25447066
https://doi.org/10.1016/j.neuropsychologia.2014.10.009
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4410788/
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