Title
Reduced functional segregation between the default mode network and the executive control network in healthy older adults: A longitudinal study.
Abstract
The effects of age on functional connectivity (FC) of intrinsic connectivity networks (ICNs) have largely been derived from cross-sectional studies. Far less is known about longitudinal changes in FC and how they relate to ageing-related cognitive decline. We evaluated intra- and inter-network FC in 78 healthy older adults two or three times over a period of 4years. Using linear mixed modeling we found progressive loss of functional specialization with ageing, evidenced by a decline in intra-network FC within the executive control (ECN) and default mode networks (DMN). In contrast, longitudinal inter-network FC between ECN and DMN showed a u-shaped trajectory whereby functional segregation between these two networks initially increased over time and later decreased as participants aged. The rate of loss in functional segregation between ECN and DMN was associated with ageing-related decline in processing speed. The observed longitudinal FC changes and their associations with processing speed remained after correcting for longitudinal reduction in gray matter volume. These findings help connect ageing-related changes in FC with ageing-related decline in cognitive performance and underscore the value of collecting concurrent longitudinal imaging and behavioral data.
Year
DOI
Venue
2016
10.1016/j.neuroimage.2016.03.029
NeuroImage
Keywords
Field
DocType
Functional connectivity,fMRI,Ageing,Longitudinal changes,Functional segregation
Functional specialization,Developmental psychology,Default mode network,Gerontology,Ageing,Longitudinal study,Psychology,Behavioral data,Control network,Audiology,Effects of sleep deprivation on cognitive performance,Cognitive decline
Journal
Volume
ISSN
Citations 
133
1053-8119
15
PageRank 
References 
Authors
0.83
18
5
Name
Order
Citations
PageRank
Kwun Kei Ng1252.14
June C. Lo2181.62
Joseph K. W. Lim3181.30
Michael W. L. Chee427926.13
Juan Zhou5834.71