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Area of Science:

  • Gerontology
  • Cognitive Neuroscience
  • Sociology

Background:

  • Social isolation is a growing concern in aging populations.
  • Understanding its impact on cognitive functioning is crucial for public health.

Purpose of the Study:

  • To assess the relationship between social isolation and cognitive functioning in Japanese adults aged 60+.
  • To investigate potential endogeneity in this association using advanced econometric methods.

Main Methods:

  • Utilized data from the National Survey of the Japanese Elderly.
  • Developed a comprehensive social isolation index.
  • Employed panel data fixed-effects and System Generalized Method of Moments (GMM) models.

Main Results:

  • A significant negative association was observed between social isolation and cognitive functioning, particularly in individuals aged 75+.
  • A 1% increase in social isolation correlated with a 24% decrease in cognitive functioning for men and 20% for women.
  • The System GMM analysis, which addressed endogeneity, did not confirm this association.

Conclusions:

  • The observed association between social isolation and cognitive functioning may be biased by endogeneity.
  • Causal impacts were not established, highlighting the need for further research into the mechanisms of social relationships on health.