A study from MIT, neuroQWERTY, shows promise in detecting Parkinson's disease through the timing of a patient's keystrokes.
Home | neuroQWERTY
(mit.edu)
A discussion of the use of this technique in early detection of dementia is here:
https://pharmaphorum.com/views-and-analysis/can-your-typing-patterns-reveal-if-you-have-alzheimers/