Which nostril was more dominant, the right or the left?
Research has shown that our breathing is deeply connected with our brain function. When we are engaging the left or analytical side of the brain, we tend to breathe more through our right nostril. When we're engaging with more creative activities, like listening to music, our left nostril dominates.
When you write, are you using your left or right nostril? Are you being more analytical or more creative? Are you able to do both?