Title

Relationships Between Performance On The Cogstate Brief Battery, Neurodegeneration, And aβ Accumulation In Cognitively Normal Older Adults And Adults With MCI

Document Type

Article

Publisher

Oxford University Press

Faculty

Faculty of Health, Engineering and Science

School

School of Medical Sciences, Centre of Excellence for Alzheimer's Disease Research And Care

RAS ID

18823

Comments

Original article published as : Lim, Y. Y., Pietrzak, R. H., Bourgeat, P., Ames, D., Ellis, K. A., Rembach, A., ... & Masters, C. L. (2015). Relationships between performance on the Cogstate Brief Battery, neurodegeneration, and Aβ accumulation in cognitively normal older adults and adults with MCI. Archives of Clinical Neuropsychology, 30(1), 49-58. Original article available here

Abstract

We investigated the extent to which decline in memory and working memory in beta-amyloid (Aβ) positive non-demented individuals was related to hippocampal atrophy and Aβ accumulation over 36 months. Cognitively normal older adults (CN) (n = 178) and adults with mild cognitive impairment (MCI) (n = 49) underwent positron emission tomography neuroimaging, magnetic resonance imaging, and cognitive assessments at baseline, 18- and 36-months. Relative to Aβ- CNs, Aβ+ CNs and Aβ+ MCIs showed greater rates of cognitive decline, Aβ accumulation, and hippocampal atrophy. Analysis of interrelationships between these Alzheimer's disease markers in Aβ+ CNs and MCIs indicated that rate of Aβ accumulation was associated with rate of hippocampal atrophy (β = -0.05, p =.037), which was in turn associated independently with rate of decline in memory (β = -0.03, p =.032). This suggests that Aβ accumulation precedes any neurodegeneration or clinical symptoms, and that the relationship between Aβ and cognitive decline is mediated by hippocampal atrophy.

DOI

10.1093/arclin/acu068

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