[tom_hartke]

It's worth highlighting that first result is exactly what you asked for, given all 4 of your criteria:

1. It's on adults.

2. It's longitudinal over multiple years.

3. It studies variations in brain volume.

4. It focuses on healthy individuals.

You can see the full results for that search text here: https://undermind.ai/query_app/display_one_search/e1a3805d35...

[robwwilliams]

And that first hit in JAMA Open is a fabulous paper. Ten or mire yearly MRI scans for 650 subjects.