potential sources
autumn.health passive mood tracking has no references likely semantic analysis. https://www.turing.ac.uk/research/interest-groups/data-science-mental-health
https://forum.quantifiedself.com/t/quantifying-cognitive-performance/2576/9 https://forum.quantifiedself.com/t/quantifying-cognitive-performance/2576
learning a todo page https://old.reddit.com/r/dataisbeautiful/comments/tja91p/oc_vocabulary_acquisition_in_spanish_through/
https://artofmemory.com/wiki/Main_Page/
https://en.wikipedia.org/wiki/Highway_hypnosis
https://www.jmir.org/2022/1/e28368
https://codeforces.com/blog/entry/23054 competitive programming
https://pdfs.semanticscholar.org/d480/900464ef8a78cf4702ae8b4a9c9a20a35cdf.pdf a few (7) validated apps for cognitive decline testing