The mix matters: complex personal networks relate to higher cognitive functioning in old age
Lea Ellwardt1, Theo G Van Tilburg2, Marja J Aartsen2
1University of Groningen, Department of Sociology and Interuniversity Center for Social Science Theory and Methodology (ICS), Grote Rozenstraat 31, 9712 TG Groningen, The Netherlands.
Social Science & Medicine (1982)
|May 21, 2014
Summary
Social network complexity, not size, is linked to cognitive function in older adults. A diverse network may support brain health, but its protective effect against cognitive decline is limited.
Area of Science:
- Gerontology
- Cognitive Neuroscience
- Social Epidemiology
Background:
- Social engagement in older adults is theorized to protect against cognitive decline and dementia.
- Brain training through social interaction is a proposed mechanism, but research on network structure and cognition is inconclusive.
- Previous studies often focused on network size, neglecting the impact of network complexity on cognitive health.
Purpose of the Study:
- To investigate the relationship between personal network complexity and cognitive functioning in older adults.
- To determine if a higher number of relationship types, rather than network size, is associated with better cognitive function and slower decline.
- To examine the role of network characteristics in buffering cognitive aging.
Main Methods:
- Utilized data from the Longitudinal Aging Study Amsterdam (LASA), including 2959 participants aged 54-85.
- Assessed cognitive functioning using the Mini-Mental State Examination (MMSE).
- Measured network complexity using the Social Network Index and analyzed data with fixed-effects regression models over a 20-year period.
Main Results:
- A reduction in network complexity was significantly associated with a decline in cognitive functioning.
- This association was independent of network size and the presence of specific relationship types.
- Increased network complexity showed only a marginal buffering effect on the rate of cognitive decline.
Conclusions:
- Network characteristics and cognitive functioning are interconnected.
- The association between social network complexity and cognitive function appears to be primarily cross-sectional.
- While network diversity is linked to cognitive function, its long-term protective impact against decline is limited.
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