The left brain is thought to be analytical, logical, precise. The right brain, not so much. Words associated with right-brained thinking include "imaginitive", "intuitive", "creative". The left hemisphere of the brain controls functions on the right side of the body, and the right controls the left.
Anybody who has ever met me would say that I am pretty darn right-brained:
- I'm left-handed.
- I'm really bad at math.
- I enjoy artistic pursuits.
- I'm very emotional.
Apparently talent with words is also a left-brained trait, but this one gives me pause. Yes, there's a certain amount of logic and precision involved in the writing process, but it is also creative, emotional, etc. So it would seem that writers draw on both hemispheres of their brain in order to practice their craft.