How much variation in gravity between feet and head is noticable?

This is assuming that the direction of the gravitational gradient remains the same ("down") - it's just the magnitude that's varying.

I don't need an accurate figure, just a ballpark one, which is good considering that I don't believe that an accurate figure exists.

I'm working out how large a flat disk of neutronium or similar would need to be in order to live comfortably on it. The answer seems to be surprisingly small (even 100m radius gives only about 20cm/s^2 difference between head to toe at the center), but without this figure I can't really figure out how small.

Note that this should include things like pressure variation due to the difference in gravity.

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How much variation in gravity between feet and head is noticable?

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