This is something fun to demonstrate. Take your arms and put them out
in front of you, and bend them so each hand is pointing at the other.
Now with one start making a circular motion (clockwise or counter),
then with the other hand try to make a circular motion in the opposite
direction. Most will find this impossible or extremely slow to do.
Often people will spin their hands in the same direction and think
they are doing it, and then realize they are not.
I found this extremely difficult to do when I was first exposed to the
concept. But since then have mastered the motion. I started by
breaking the motion up into its parts in my head, starting my fingers
pointing at each other then moving them to their respective nodes, 1/4
of the circle. After much practice the concept has stuck and I can now
do it with my legs the first try.
Note: You do risk getting weird looks from co-workers or others around
you by attempting all this. Therefore do not attempt during important
meetings or other gatherings where it?s imperative to maintain the
appearance of dignity and sanity.
Personally I don't think there is anyone, barring some related medical
problem, that can't accomplish this motion with some practice. I think
most people find it difficult because they never do anything in their
day to day life that requires the usage of such a motion, therefore it
remains unnurtured. But I could be wrong, and if indeed people try to
practice this for some time and cannot get it, let me know. I may have
a slight advantage because I am left-handed, but use my right for
everything else (brushing teeth, scissors, etc.)
So to put my point of view to your question, practice keeps us from
simultaneously producing two different hand movements, at all or
easily. |
