I believe that I'm primarily right brained. Psychologically, your right brain controls the left side of your body and your left brain controls the right side... Using this there is a simple test one can use to determine which side of their brain dominates (granted I suppose there are exceptions).
Your eyes are always left socially unbiased since you were a little kid unless you have eye problems... Therefore, they provide a perfect way to determine the dominant side of the brain by determining which eye provides the dominant view that you use in everyday life.
The idea is simple enough, find a difraction patter that changes rapidly according to your position within the room. Then stand still. Look at the diffraction patter and memorize the rough outline of the image seen. Then, close your left eye, does it change? (If so then you are left eye dominant because your brain had to switch from the left eye view to the right eye view in order to keep vision). Now close your right eye, does it change? (If so then you are right eye dominant and your brain had to do the same thing to flip from the right eye vision to the left eye vision).
Because each lobe controls the opposite side of the body (the right lobe controls the left side of the body and the left lobe controls the right side of the body... eyes too) then determining which eye is dominant gives you a good idea of which side of the brain is dominant.
If the diffraction pattern changes when the left eye is closed, you are right brained.
If the diffraction patter changes when the right eye is closed, you are left brained.
I study physics... but I also have a degree in animation, compose music and play several musical instruments, write stories and enjoy speaking Japanese to a lesser or greater extent. Therefore, even though I train highly in left brained areas I do have many traits of a right brained person and in the test, closing my left eye causes the diffraction pattern to change. I am right handed, but my parents used to take things from my left hand and place them in my right hand when I was younger all the time so this test doesn't count.
I conclude that I am likely right brain dominant. (By the way, I realize that diffraction patterns aren't the easiest things to find
, but try it next time you find one).
-Pascal