Researchers from the University of Utah have found no evidence to support the theory that people use one half of their brain more than the other. It didn’t matter whether a person was more logical (left-brained) or creative (right-brained); MRIs revealed that each used both hemispheres of the brain equally during tests.
So, it looks like the right-brain/left-brain theory was just something cooked up by feeble, right-brain-leaning chowderheads, which is exactly the conclusion you’d expect out of cold, calculating left-brainers.