Is this true? I have no idea. I am, however, fascinated with brain research and what it tells us about learning. One person's explanation can be found at http://thebraintrainingblog.blogspot.com/2007/10/right-brain-vs-left-brain.html
And I have no clue whether he knows what he's talking about or not. But it's fun to think about. And it's fun to try to make her switch directions.