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A structural equation modeling investigation of age-related variance in executive function and DTI measured white matter damage.

Charlton, RA; Landau, S; Schiavone, F; Barrick, TR; Clark, CA; Markus, HS; Morris, RG; (2008) A structural equation modeling investigation of age-related variance in executive function and DTI measured white matter damage. Neurobiol Aging , 29 (10) pp. 1547-1555. 10.1016/j.neurobiolaging.2007.03.017.

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Abstract

Cognitive changes in normal aging have been explained by the frontal-executive hypothesis, but the assumptions made by this hypothesis concerning the neurobiological causes are still a matter of debate. Executive functions (EF) may activate neural networks that include disparate grey matter regions, and rely on the integrity of white matter connections. In 118 adults (50-90 years old) from the GENIE study, white matter integrity was measured using diffusion tensor imaging, and information processing speed, fluid intelligence and EF were assessed. A theory-driven structural equation model was developed to test associations between variables. The model was revised, removing non-significant paths. The adjusted model explained well the covariance in our data; and suggested that the reduction in white matter integrity associated with age directly affected only working memory. Fluid intelligence was mediated by all measured cognitive variables. The results suggest that white matter integrity may be particularly important for abilities activating complex neural networks, as occurs in working memory. Integration of the information processing speed and frontal-executive hypotheses may provide important information regarding common, unique, and mediating factors in cognitive aging.

Type: Article
Title: A structural equation modeling investigation of age-related variance in executive function and DTI measured white matter damage.
Location: United States
DOI: 10.1016/j.neurobiolaging.2007.03.017
Keywords: Aged, Aged, 80 and over, Aging, Brain, Cognition, Computer Simulation, Diffusion Magnetic Resonance Imaging, Disease Progression, Female, Humans, Male, Memory Disorders, Memory, Short-Term, Mental Processes, Middle Aged, Models, Theoretical, Nerve Fibers, Myelinated, Nerve Net, Neural Pathways, Neuropsychological Tests, Prospective Studies, Reaction Time, Wallerian Degeneration
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Pop Health Sciences > UCL GOS Institute of Child Health
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Pop Health Sciences > UCL GOS Institute of Child Health > ICH Developmental Neurosciences Prog
URI: http://discovery.ucl.ac.uk/id/eprint/152704
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