If you look above, you'll see a YouTube video containing a spinning image of a woman. Supposedly, it is suppose to be a test if you are rely more on the right side of your brain or your left. When in actuality, it's an optical illusion (another term in our book) that has to do with our vision, not our personality. And let's, be honest, when you say it like that, the whole concept of being more right brained just sounds ridiculous. Scienceblogs.com comments there are functional asymmetries in the brain and that certain hemispheres are "specialized for particular functions" but the notion of the illusion having to do with our human characteristics is "absolute nonsense". Perhaps I see the woman spinning clockwise because I want to be a more 'right brained person', more creative; I am an art major after all.
In fact, the 'left brain/right brain' theory derived from phrenology, another term in our textbook, saying that the physical shape of our brain has to do with our characteristics and personality. As the field of psychology grew, this was of course disproved, as has the left brain/right brain theory. Both theories have since been disproved by the extraordinary claim principle; the evidence to support the hypothesis was not nearly strong enough as the claim. So in conclusion, the hemispheres in our brain don't control our personality traits. It just takes a little scientific thinking to rule out the connection between an optical illusion and how our brains will perceive it, to human characteristics.