Loneliness → Cognitive performance
Higher loneliness decreases cognitive performance.
In a meta-analysis of older adults screened for dementia, more loneliness was linked to slightly lower global cognitive function.
Meta-analysis · Moderate
The two move together in observational data. Nobody has yet tested whether one causes the other.
Mechanism
The papers do not name a pathway from loneliness to thinking skills.
Caveats
The pooled correlation of -0.08 is small. The studies are observational, so the link does not show that loneliness lowers cognition. A cohort of older adults found that easing a loneliness item on a depression scale went with less later decline in executive function and memory. That item belongs to a depression measure, so it is indirect evidence. Poor thinking may also leave people lonelier.
Effect
Correlation (r) -0.08 (95% CI -0.14 to -0.02). Loneliness tracked with slightly lower global cognitive function in older adults without dementia.
Nodes
Named confounders
Cite this page
What Causes What. “Loneliness → Cognitive performance.” https://whatcauseswhat.org/edges/e-loneliness-cognition (atlas updated 2026-10-17).
Papers
- Loneliness and Cognitive Function in Older Adults Without Dementia: A Systematic Review and Meta-Analysis.
KD Harrington, S Vasan, JE Kang, MJ Sliwinski, MH Lim · 2023 · Journal of Alzheimer's disease : JAD
older adults screened for dementia · Correlation (r) -0.08 (95% CI -0.14 to -0.02)
- Depressive Symptoms and Cognitive Function in Older Adults: A Cross-Lagged Network Analysis.
HL Sun, P Chen, W Bai, Q Zhang, S Sha, Z Su, T Cheung, GS Ungvari · 2025 · Depression and anxiety
older adults aged 50 years or older (ELSA)