system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why can't people with dementia draw clocks correctly?
gpt
There are several aspects of the clock-drawing test.  You have to plan ahead, and maintain a symmetric position for the numbers.  Then you have to add hands, pointed at the time the doctor asks you to use, which is often ten minutes before 4 or ten minutes after 11.  This means putting the hand on the right side of the number.  There are many metrics for scoring how well someone draws the clock face, and there is pretty good correlation to more involved tests.  That's why the clock test is so common, it's super easy and doesn't take any equipment besides a pencil.  If there is a change in scores, then it might be worth a more involved test.