The Nun Study: How Youthful Words Predicted Decades of Dementia
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The Nun Study: How Youthful Words Predicted Decades of Dementia
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A single consent form in 1986 led 678 nuns to promise their brains to science - and a box of autobiographies written around age 22 revealed that the number of ideas per ten words predicted who would develop Alzheimer’s pathology decades later. Could the structure of a young person's language really foreshadow brain changes half a century before symptoms appear?
In this episode, we tell the story of the Nun Study, how researchers paired lifelong cognitive exams with post-mortem brain analysis and scores of early-life essays, and why a measure called idea density became central to predicting Alzheimer’s Disease Neuropathologic Change.
Person: David Snowdon
Person: William Markesbery
Date: 1986
Case: Nun Study
Topic: idea density and Alzheimer’s Disease Neuropathologic Change
- 678 sisters enrolled in the study in 1986.
- Most autobiographies were written around age 22 and archived for over 50 years.
- Idea density was measured as distinct ideas per ten words in each essay.
- Autopsies looked for amyloid beta plaques and tau neurofibrillary tangles in neocortex and hippocampus.
- Researchers performed annual cognitive and physical examinations on all participants.
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