Shared neural substrates of cognitive function and postural control in older adults.

Alzheimer's & Dementia : the Journal of the Alzheimer's Association
Patrick J SpartoCaterina Rosano

Abstract

Poor cognitive function and postural control co-occur in older adults. It is unclear whether they share neural substrates. Postural sway error during a novel visual tracking (VT) condition and gray matter volume (GMV) were compared between participants with normal cognition (NC), mild cognitive impairment (MCI), or dementia (n = 179, mean age 82, 56% females, 56% white). Associations between VT error, cognitive function, and GMV were examined. Greater VT error was associated with having dementia compared to NC or MCI (odds ratio [95% CI] = 2.15 [1.38, 3.36] and 1.58 [1.05, 2.38]). Regions with lower GMV related to greater VT error and worse cognition were: bilateral hippocampi, parahippocampi, entorhinal, and parietal cortices (all P ≤0.05). GMV of bilateral hippocampi and left parahippocampus explained >20% of VT error between dementia and NC. Postural control during visuospatial tasks and dementia may share neural substrates, specifically memory-related regions.

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