Continuing the discussion from Your right brain is not creative:
Her talk mentioned how each half processes information. The left side organizes in a linear fashion and the right side takes in everything at once as a gestalt. When I heard that talk, I realized I spend much of my life using the left side of my brain. And the writing I did for school and my career came from that side. It wasn't until I started writing fiction by hand with pen and paper that I gave up the logical organization thing. I had to just let my right brain say what it wanted to say. I could always cross it out but that was the left brain taking control again.
I've yet to see discussions that discount this theory.