Generally speaking, the part of your brain controlling your language is in the left hemisphere, and the part controlling visual spatial functions is in the right. My dad recently told me of this phenomenon where in some people this is reversed. Before brain surgery, surgeons perform the Wada test to make sure they are fixing the correct part of the brain. Now I don’t particularly want brain surgery, so I was wondering if there was any way I could find out for myself if the sides of my brain are reversed.