This is true, but I'm not sure it's relevant in this case. AFAIK old people generally have more trouble controlling how far they push things, but the only distinction we're interested in here is whether they're pushing or merely resting their hand.
This still wouldn't be enough for people with diseases that cause major tremors, but I'd imagine it's enough for people who have lost fine motor control, because we're only trying to distinguish pushing from not-pushing.
This still wouldn't be enough for people with diseases that cause major tremors, but I'd imagine it's enough for people who have lost fine motor control, because we're only trying to distinguish pushing from not-pushing.