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Peer-reviewedCC BY 4.0Frontiers in Psychiatry

The unequal cognitive consequences of social disconnection: mechanisms, modifiers and opportunities for dementia prevention

  • Xing Xu1,2
  • Zhaoying Yu1,2
  • Lei Gao1,2
  • Yaping Chen1,2
  • Yu Liu2,3
  1. 1Department of Psychiatry, Affiliated Minkang Hospital of Ningbo University (Ningbo Psychiatric Hospital), Ningbo, China
  2. 2Health Science Center, Ningbo University, Ningbo, China
  3. 3School of Health and Care, Zhejiang Pharmaceutical University, Ningbo, China
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Abstract

Social isolation and loneliness are increasingly recognized as important determinants of cognitive decline and dementia risk in older adults. However, the strength and nature of these associations vary substantially across populations, cognitive outcomes, and stages of ageing. This review examines the sources of such heterogeneity by distinguishing objective social isolation from subjective loneliness and exploring their different psychological, behavioural, and biological pathways. Using a systematic multi-database search and thematic synthesis, we integrated evidence from longitudinal studies, neuroimaging research, and intervention trials to identify factors that increase vulnerability and promote resilience. The review highlights how psychosocial, behavioural, neuroendocrine, and neurostructural mechanisms contribute to differences in cognitive outcomes and discusses implications for targeted and context-sensitive interventions. Remaining challenges include measurement heterogeneity, limited causal evidence, and underrepresentation of low- and middle-income countries. Future research should prioritize harmonized assessments, stratified intervention trials, and culturally adapted implementation approaches. Early identification and prevention of social disconnection may provide greater benefits than attempts to reverse established isolation.

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Cite

BibTeXRIS
BibTeX
@article{xu2026unequal,
  title = {{The unequal cognitive consequences of social disconnection: mechanisms, modifiers and opportunities for dementia prevention}},
  author = {Xing Xu and Zhaoying Yu and Lei Gao and Yaping Chen and Yu Liu},
  journal = {Frontiers in Psychiatry},
  year = {2026},
  month = oct,
  doi = {10.3389/fpsyt.2026.1949322},
  url = {https://doi.org/10.3389/fpsyt.2026.1949322},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - The unequal cognitive consequences of social disconnection: mechanisms, modifiers and opportunities for dementia prevention
AU  - Xing Xu
AU  - Zhaoying Yu
AU  - Lei Gao
AU  - Yaping Chen
AU  - Yu Liu
PY  - 2026
DA  - 2026/10/12
JO  - Frontiers in Psychiatry
DO  - 10.3389/fpsyt.2026.1949322
UR  - https://doi.org/10.3389/fpsyt.2026.1949322
AB  - Social isolation and loneliness are increasingly recognized as important determinants of cognitive decline and dementia risk in older adults. However, the strength and nature of these associations vary substantially across populations, cognitive outcomes, and stages of ageing. This review examines the sources of such heterogeneity by distinguishing objective social isolation from subjective loneliness and exploring their different psychological, behavioural, and biological pathways. Using a systematic multi-database search and thematic synthesis, we integrated evidence from longitudinal studies, neuroimaging research, and intervention trials to identify factors that increase vulnerability and promote resilience. The review highlights how psychosocial, behavioural, neuroendocrine, and neurostructural mechanisms contribute to differences in cognitive outcomes and discusses implications for targeted and context-sensitive interventions. Remaining challenges include measurement heterogeneity, limited causal evidence, and underrepresentation of low- and middle-income countries. Future research should prioritize harmonized assessments, stratified intervention trials, and culturally adapted implementation approaches. Early identification and prevention of social disconnection may provide greater benefits than attempts to reverse established isolation.
SN  - 1664-0640
ER  -