Selective decline in memory function among healthy elderly
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Summary
This study addresses the controversy surrounding age-related memory decline, which has largely been established through cross-sectional studies that fail to account for generational differences and learning effects. The authors aimed to determine if aging is associated with memory decline using longitudinal data from healthy elderly individuals, while controlling for the improvement in test performance caused by repeated exposure. The researchers analyzed data from 212 community-based, healthy elderly subjects from the Washington Heights Inwood Aging Project. Participants were excluded if they had dementia, cognitive impairment, stroke, Parkinson’s disease, or depression. Subjects underwent annual neuropsychological evaluations for at least four years. The study compared longitudinal performance between two age groups: those younger than 70 and those 70 and older. Cognitive domains assessed included memory (using the Selective Reminding Test), language, visuospatial ability, and abstract reasoning. Statistical analysis employed Generalized Estimated Equations to assess differences in longitudinal performance, adjusting for covariates such as education, gender, and ethnicity. The results demonstrated a selective decline in memory function among the older age group. Specifically, the older group showed a relative decline in total recall scores, which measure the acquisition and early retrieval of new information. However, no significant age-related decline was observed in memory retention scores, indicating that the ability to retain information over time remained stable. Furthermore, unlike memory, no relative age-related decline was found in tests of language, visuospatial ability, or abstract reasoning; these domains showed parallel improvements in both age groups due to the learning effect. The specific profile of decline in acquisition and retrieval, without loss of retention, anatomically localizes to the hippocampal formation. The study concludes that age-related memory decline is a real phenomenon that can be documented longitudinally, but it is not diffuse across all cognitive domains. Instead, it is restricted to specific aspects of memory dependent on the hippocampal formation. The authors suggest that both early Alzheimer’s disease and non-AD physiologic processes likely contribute to this decline. Continued follow-up of these subjects is necessary to distinguish between these etiologies and determine which individuals progress to dementia.
Provenance
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | OpenAlex-citations | — | — | 1 | 2026-06-19 |
| archive | success | unpaywall | — | — | 2 | 2026-06-25 |
| extract | success | cached | — | — | 2 | 2026-06-26 |
| clean | success | clean | — | — | 1 | 2026-06-19 |
| chunk | success | chunk | — | — | 1 | 2026-06-19 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-19 |
| promote | success | — | — | — | 1 | 2026-06-19 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-26 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-19 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.
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