I spent about two years dedicating my free time to experiments of this type. The most profoundly affecting exercise was training the left side of my body (I'm right-handed). I learned to write in left-handed mirrored script (Da Vinci style) and performed all sorts of everyday actions with my left hand. Amazingly, the more I trained my left hand the more my right-handed writing and drawing skills improved. Within a few months I found that I was able to switch back and forth between two very different modes of thought. My brain seemed wired differently. For a few months I could hardly put sentences together in speech, it was an odd sensation. Eventually though, I developed the ability to intentionally control which half of my brain was switched on. Science is all over the place when it comes to the left/right brain theory, but there is undoubtedly a level of truth to it. If you can learn to control it, it becomes a powerful problem-solving technique.