This is very interesting, thank you.

I could not get to the store because of the cookie banner that does not work (at left on mobile chrome and ff). The Internet Archive page: https://archive.ph/qz4ep

I wonder how this test could be modified for people that have neurological problems - my father's hands shake a lot but I would like to try the test on him (I do not have suspicions, just curious).

I passed it :)

"One variation of the test is to provide the person with a blank piece of paper and ask them to draw a clock showing 10 minutes after 11. The word "hands" is not used to avoid giving clues."

Hmm, ambiguity. I would be the smart ass that drew a digital clock for them, or a shaku-dokei.