The Lothian Birth Cohort 1936: a study to examine influences on cognitive ageing from age 11 to age 70 and beyond
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Summary
This document is a study protocol describing the design and recruitment of the Lothian Birth Cohort 1936 (LBC1936), a longitudinal study aimed at identifying the determinants of normal cognitive ageing. The research addresses the significant societal burden of cognitive decline, which reduces independence and quality of life. A primary motivation for this study is the limitation of existing research, which often lacks long-term cognitive assessments spanning from youth to old age. The LBC1936 seeks to examine influences on cognitive change over nearly six decades, utilizing childhood intelligence data as a baseline to isolate age-related decline from pre-existing ability. The study cohort consists of 1,091 surviving participants from the Scottish Mental Survey of 1947 (SMS1947), who were originally tested on the Moray House Test No. 12 at age 11. Recruitment targeted individuals born in 1936 residing in the Lothian area of Scotland. Through a multi-stage process involving mailings via the Community Health Index and media advertisements, researchers identified eligible participants who had taken the original survey. Participants underwent comprehensive assessments at approximately age 70, including medical interviews, physical fitness testing, extensive cognitive testing, psychosocial questionnaires, and blood sampling for DNA extraction. Cognitive evaluations covered reasoning, memory, executive function, and speed of information processing, utilizing tools such as the Wechsler Adult Intelligence Scale-IIIUK, Wechsler Memory Scale-IIIUK, and specific measures for inspection time and reaction time. The study’s primary strength lies in its ability to capture the phenotype of lifetime cognitive change by comparing age 11 and age 70 intelligence scores. The protocol outlines specific objectives, including the examination of genetic contributions to cognitive ageing, the role of speed of information processing as a mediator of age-related decline, and the impact of medical, lifestyle, and social factors. By adjusting for childhood IQ, the study aims to determine whether genetic polymorphisms and other variables influence the rate of cognitive decline rather than baseline ability. The collected data, including stored DNA and detailed phenotypic records, are intended to serve as a valuable resource for future research into the mechanisms of cognition and potential interventions for successful ageing.
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| Stage | Outcome | Tool | Model | Prompt | Attempts | Completed |
|---|---|---|---|---|---|---|
| discover | success | OpenAlex-citations | — | — | 1 | 2026-06-24 |
| archive | success | unpaywall | — | — | 2 | 2026-06-26 |
| extract | success | cached | — | — | 2 | 2026-06-26 |
| clean | success | clean | — | — | 1 | 2026-06-25 |
| chunk | success | chunk | — | — | 1 | 2026-06-25 |
| embed | success | embed | Qwen/Qwen3-Embedding-8B | — | 1 | 2026-06-25 |
| promote | success | — | — | — | 1 | 2026-06-24 |
| summarize | success | llm | qwen3.6-27b-prismaquant | summ-v5 | 1 | 2026-06-26 |
| tag | success | vector_similarity | — | — | 6 | 2026-06-25 |
| verify | success | — | — | — | 1 | 2026-06-26 |
Summary generated by qwen3.6-27b-prismaquant on 2026-06-26; verification: verified.
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