What do people mean when they say “I’m more left-brained than right-brained?” They’re referring to the left and right hemisphere of their brain. These hemispheres look the same, but they have very unique functions. Scientists believe that the left hemisphere deals with the analytical world and decision making, while the right hemisphere deals with change. We usually think that musicians are using more of their right hemispheres, and scientists use their left, but research shows that this isn’t the case. Both hemisphere’s work together to keep us functioning well.